---
_id: '65585'
abstract:
- lang: eng
text: This article explores the relativity of Islamic normativity through the taṣwīb
doctrine (kullu mujtahid muṣīb) as formulated by al-ʿAnbarī and received by al-Jāḥiẓ
(d. 255/869), al-Jaṣṣāṣ (d. 370/981), and al-Baṣrī (d. 436/1044). Al-Jaṣṣāṣ reinterprets
the thesis through the ḥanafī principle of ashbah bi-l-aṣl as a hermeneutical-methodological
approach; al-Baṣrī elaborates it into an epistemo-logical model of normative plurality,
while al-Jāḥiẓ articulates a soteriological theory of moral responsibility in
the context of kalām. The analysis shows that classical Islamic legal theory developed
a distinct modelof normativity that maintains binding force under conditions of
pluralism and uncertainty. The article calls for renewed engagement with this
tradition in contemporary debates on religious normativity and legal pluralism.
article_type: original
author:
- first_name: Mohammed
full_name: Abdelrahem, Mohammed
id: '95179'
last_name: Abdelrahem
orcid: 0000-0002-0545-9799
citation:
ama: 'Abdelrahem M. Zur Relativität islamischer Normativität: Diskurslinien der
taṣwīb-Lehre von al-Ǧāḥiẓ (gest. 869) zu al-Ǧaṣṣāṣ (gest. 981) und al-Baṣrī (gest.
1044) . Forum Islamic-Theological Studies. 2026;Vol. 5 (2026)(1):94-111.
doi:10.71573/2941-122X_2026_5-1_154'
apa: 'Abdelrahem, M. (2026). Zur Relativität islamischer Normativität: Diskurslinien
der taṣwīb-Lehre von al-Ǧāḥiẓ (gest. 869) zu al-Ǧaṣṣāṣ (gest. 981) und al-Baṣrī
(gest. 1044) . Forum Islamic-Theological Studies, Vol. 5 (2026)(1),
94–111. https://doi.org/10.71573/2941-122X_2026_5-1_154'
bibtex: '@article{Abdelrahem_2026, title={Zur Relativität islamischer Normativität:
Diskurslinien der taṣwīb-Lehre von al-Ǧāḥiẓ (gest. 869) zu al-Ǧaṣṣāṣ (gest. 981)
und al-Baṣrī (gest. 1044) }, volume={Vol. 5 (2026)}, DOI={10.71573/2941-122X_2026_5-1_154},
number={1}, journal={Forum Islamic-Theological Studies}, publisher={LibreCat University},
author={Abdelrahem, Mohammed}, year={2026}, pages={94–111} }'
chicago: 'Abdelrahem, Mohammed. “Zur Relativität islamischer Normativität: Diskurslinien
der taṣwīb-Lehre von al-Ǧāḥiẓ (gest. 869) zu al-Ǧaṣṣāṣ (gest. 981) und al-Baṣrī
(gest. 1044) .” Forum Islamic-Theological Studies Vol. 5 (2026), no. 1
(2026): 94–111. https://doi.org/10.71573/2941-122X_2026_5-1_154.'
ieee: 'M. Abdelrahem, “Zur Relativität islamischer Normativität: Diskurslinien der
taṣwīb-Lehre von al-Ǧāḥiẓ (gest. 869) zu al-Ǧaṣṣāṣ (gest. 981) und al-Baṣrī (gest.
1044) ,” Forum Islamic-Theological Studies, vol. Vol. 5 (2026), no. 1,
pp. 94–111, 2026, doi: 10.71573/2941-122X_2026_5-1_154.'
mla: 'Abdelrahem, Mohammed. “Zur Relativität islamischer Normativität: Diskurslinien
der taṣwīb-Lehre von al-Ǧāḥiẓ (gest. 869) zu al-Ǧaṣṣāṣ (gest. 981) und al-Baṣrī
(gest. 1044) .” Forum Islamic-Theological Studies, vol. Vol. 5 (2026),
no. 1, LibreCat University, 2026, pp. 94–111, doi:10.71573/2941-122X_2026_5-1_154.'
short: M. Abdelrahem, Forum Islamic-Theological Studies Vol. 5 (2026) (2026) 94–111.
date_created: 2026-05-08T11:39:27Z
date_updated: 2026-06-08T14:26:44Z
ddc:
- '200'
department:
- _id: '469'
doi: 10.71573/2941-122X_2026_5-1_154
file:
- access_level: closed
content_type: application/pdf
creator: abdelrah
date_created: 2026-05-22T10:44:11Z
date_updated: 2026-05-22T10:44:11Z
file_id: '65677'
file_name: Relativität der Normativität_Abdelrahem_FORUM_2026.pdf
file_size: 1140343
relation: main_file
success: 1
file_date_updated: 2026-05-22T10:44:11Z
has_accepted_license: '1'
issue: '1'
keyword:
- IslamicTheology
- Usul al-Fiqh
- taswib
- islamische Rechtsphilosophie
- LegalTheory
- Pluralism
- OpenAccess
language:
- iso: ger
main_file_link:
- open_access: '1'
url: https://forum-journal.eu/forum/en/article/view/154
oa: '1'
page: 94-111
publication: Forum Islamic-Theological Studies
publication_identifier:
issn:
- 2941-122X
publication_status: published
publisher: LibreCat University
quality_controlled: '1'
status: public
title: 'Zur Relativität islamischer Normativität: Diskurslinien der taṣwīb-Lehre von
al-Ǧāḥiẓ (gest. 869) zu al-Ǧaṣṣāṣ (gest. 981) und al-Baṣrī (gest. 1044) '
type: journal_article
user_id: '95179'
volume: Vol. 5 (2026)
year: '2026'
...
---
_id: '66036'
abstract:
- lang: eng
text: Light-assisted metal oxide-based chemiresistive gas sensors are widely explored
for operation at relatively low temperatures, yet the investigation of the role
of irradiance, as opposed to wavelength, remains underrepresented. Here, we systematically
quantify the irradiance-dependent behavior of ordered mesoporous In2O3 under visible
light illumination. Photoconductivity measurements reveal two distinct irradiance
regimes consistent with trap-limited transport at low power and recombination-
or saturation-limited transport at high power. Gas sensing experiments towards
CO and H2 show a pronounced non-monotonic response, reaching maximum responses
of 0.74 for 135 ppm CO at 67 mW cm−2 and 0.64 for 90 ppm H2 at 11 mW cm−2, followed
by strong suppression at higher irradiance. Illumination also accelerated the
response kinetics. At 60 ppm, t90 decreases from 96 to 12 s for CO and 141 to
27 s for H2, corresponding to an 8- and 5-fold faster response time, respectively.
Near-ambient pressure-XPS under controlled atmosphere and density functional theory
calculations indicate defect-mediated excitation. Oxygen vacancy states and illumination-induced
modification of surface oxygen species govern this behavior. The results establish
irradiance as a critical mechanistic parameter that determines whether In2O3 operates
in a surface-controlled or bulk photoconductive regime. These findings highlight
the need to explicitly optimize and report irradiance in illuminated gas sensor
studies, and not only the power consumption of the light source.
article_number: acssensors.6c01100
article_type: original
author:
- first_name: Sven
full_name: Voth, Sven
last_name: Voth
- first_name: Zhenyu
full_name: Zhao, Zhenyu
last_name: Zhao
- first_name: Dominik
full_name: Baier, Dominik
last_name: Baier
- first_name: Alexandra
full_name: Glass, Alexandra
last_name: Glass
- first_name: Hossam
full_name: Elgabarty, Hossam
id: '60250'
last_name: Elgabarty
orcid: 0000-0002-4945-1481
- first_name: Oskar J.
full_name: Sandberg, Oskar J.
last_name: Sandberg
- first_name: Guido
full_name: Grundmeier, Guido
id: '194'
last_name: Grundmeier
- first_name: Michael
full_name: Tiemann, Michael
id: '23547'
last_name: Tiemann
orcid: 0000-0003-1711-2722
- first_name: Jan-Henrik
full_name: Smått, Jan-Henrik
last_name: Smått
- first_name: Nicklas
full_name: Anttu, Nicklas
last_name: Anttu
- first_name: Teresa
full_name: de los Arcos, Teresa
last_name: de los Arcos
- first_name: Christian
full_name: Weinberger, Christian
id: '11848'
last_name: Weinberger
citation:
ama: 'Voth S, Zhao Z, Baier D, et al. Role of Irradiance in Light-Activated In2O3Gas
Sensors: Why More Light Is Not Always Better. ACS Sensors. 2026;11(7).
doi:10.1021/acssensors.6c01100'
apa: 'Voth, S., Zhao, Z., Baier, D., Glass, A., Elgabarty, H., Sandberg, O. J.,
Grundmeier, G., Tiemann, M., Smått, J.-H., Anttu, N., de los Arcos, T., &
Weinberger, C. (2026). Role of Irradiance in Light-Activated In2O3Gas
Sensors: Why More Light Is Not Always Better. ACS Sensors, 11(7),
Article acssensors.6c01100. https://doi.org/10.1021/acssensors.6c01100'
bibtex: '@article{Voth_Zhao_Baier_Glass_Elgabarty_Sandberg_Grundmeier_Tiemann_Smått_Anttu_et
al._2026, title={Role of Irradiance in Light-Activated In2O3Gas
Sensors: Why More Light Is Not Always Better}, volume={11}, DOI={10.1021/acssensors.6c01100},
number={7acssensors.6c01100}, journal={ACS Sensors}, publisher={American Chemical
Society (ACS)}, author={Voth, Sven and Zhao, Zhenyu and Baier, Dominik and Glass,
Alexandra and Elgabarty, Hossam and Sandberg, Oskar J. and Grundmeier, Guido and
Tiemann, Michael and Smått, Jan-Henrik and Anttu, Nicklas and et al.}, year={2026}
}'
chicago: 'Voth, Sven, Zhenyu Zhao, Dominik Baier, Alexandra Glass, Hossam Elgabarty,
Oskar J. Sandberg, Guido Grundmeier, et al. “Role of Irradiance in Light-Activated
In2O3Gas Sensors: Why More Light Is Not Always Better.”
ACS Sensors 11, no. 7 (2026). https://doi.org/10.1021/acssensors.6c01100.'
ieee: 'S. Voth et al., “Role of Irradiance in Light-Activated In2O3Gas
Sensors: Why More Light Is Not Always Better,” ACS Sensors, vol. 11, no.
7, Art. no. acssensors.6c01100, 2026, doi: 10.1021/acssensors.6c01100.'
mla: 'Voth, Sven, et al. “Role of Irradiance in Light-Activated In2O3Gas
Sensors: Why More Light Is Not Always Better.” ACS Sensors, vol. 11, no.
7, acssensors.6c01100, American Chemical Society (ACS), 2026, doi:10.1021/acssensors.6c01100.'
short: S. Voth, Z. Zhao, D. Baier, A. Glass, H. Elgabarty, O.J. Sandberg, G. Grundmeier,
M. Tiemann, J.-H. Smått, N. Anttu, T. de los Arcos, C. Weinberger, ACS Sensors
11 (2026).
date_created: 2026-06-24T10:36:11Z
date_updated: 2026-07-27T12:18:15Z
doi: 10.1021/acssensors.6c01100
intvolume: ' 11'
issue: '7'
keyword:
- resistive gas sensing
- indium oxide
- photoactivation
- irradiance
- photoconductivity
- charge carrier dynamics
- oxygen vacancies
language:
- iso: eng
project:
- _id: '1130'
name: Exploration of optoelectronic properties of metal oxides used in gas sensors
and solar cells
publication: ACS Sensors
publication_identifier:
issn:
- 2379-3694
- 2379-3694
publication_status: published
publisher: American Chemical Society (ACS)
status: public
title: 'Role of Irradiance in Light-Activated In2O3Gas Sensors:
Why More Light Is Not Always Better'
type: journal_article
user_id: '11848'
volume: 11
year: '2026'
...
---
_id: '63830'
abstract:
- lang: eng
text: " This study investigates the effect of dispersion gas (DG) flow on the formation
and properties of maghemite (γ-Fe2O3) nanoparticles using standardized SpraySyn
burners (SS1 and SS2). Several diagnostics were employed to characterize the spray
and nanoparticles. \r\nIncreasing DG flow (6 - 12 slm) results in smaller droplet
sizes (DS), cooler flame temperatures, shorter high-temperature droplet/particle
residence times, and smaller agglomerates in the size range of 5 - 12 nm with
narrower primary particle size distribution, corresponding to higher mass fractal
dimensions, as supported by TEM and SMPS analysis, resulting in more compact agglomerates.
BET and TEM confirmed decreasing primary particle sizes with increasing DG flow.
Raman and XRD analyses predominantly identified maghemite, which shows a bimodal
distribution of crystallite sizes, while SS1 samples have a greater proportion
of larger crystallites.\r\nThe self-preserving size distributions of agglomerates
with a geometric standard deviation of 1.5 are reached faster with increasing
DG flow. The barrier effect of DG observed in SS1 leads to slower droplet combustion
kinetics, higher temperatures, and delayed precursor release, which, along with
downstream flow recirculation, result in significantly higher agglomeration rates
outside the visible flame. SS2 demonstrates improved atomization, more stable
flames, and finer, uniform nanoparticles with less carbonaceous residues (CR).
Conversely, SS1 showed broader DS distributions and higher CR levels on the γ-Fe2O3
surface, especially at higher DG flow.\r\nThis work highlights the essential role
of DG flow and nozzle geometry in controlling droplet evaporation, flame stability,
and nanoparticle growth, offering insights for optimizing SFS and validating numerical
models.\r\n"
article_number: '121992'
article_type: original
author:
- first_name: Orlando
full_name: Massopo, Orlando
last_name: Massopo
- first_name: Ricardo
full_name: Tischendorf, Ricardo
last_name: Tischendorf
- first_name: Munko
full_name: Gonchikzhapov, Munko
last_name: Gonchikzhapov
- first_name: Tina
full_name: Kasper, Tina
last_name: Kasper
- first_name: Peter
full_name: Augustin, Peter
last_name: Augustin
- first_name: Burak
full_name: Özer, Burak
last_name: Özer
- first_name: Manuel
full_name: Reddemann, Manuel
last_name: Reddemann
- first_name: Reinhold
full_name: Kneer, Reinhold
last_name: Kneer
- first_name: Mohammed-Ali
full_name: Sheikh, Mohammed-Ali
last_name: Sheikh
- first_name: Aydan Akyildiz
full_name: Mert, Aydan Akyildiz
last_name: Mert
- first_name: Hartmut
full_name: Wiggers, Hartmut
last_name: Wiggers
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
last_name: Schmid
citation:
ama: Massopo O, Tischendorf R, Gonchikzhapov M, et al. Influence of dispersion gas
flow on the spray characteristics and γ-Fe2O3 nanoparticles formation and properties
in reference SpraySyn burners. Powder Technology. 2025;470. doi:10.1016/j.powtec.2025.121992
apa: Massopo, O., Tischendorf, R., Gonchikzhapov, M., Kasper, T., Augustin, P.,
Özer, B., Reddemann, M., Kneer, R., Sheikh, M.-A., Mert, A. A., Wiggers, H., &
Schmid, H.-J. (2025). Influence of dispersion gas flow on the spray characteristics
and γ-Fe2O3 nanoparticles formation and properties in reference SpraySyn burners.
Powder Technology, 470, Article 121992. https://doi.org/10.1016/j.powtec.2025.121992
bibtex: '@article{Massopo_Tischendorf_Gonchikzhapov_Kasper_Augustin_Özer_Reddemann_Kneer_Sheikh_Mert_et
al._2025, title={Influence of dispersion gas flow on the spray characteristics
and γ-Fe2O3 nanoparticles formation and properties in reference SpraySyn burners},
volume={470}, DOI={10.1016/j.powtec.2025.121992},
number={121992}, journal={Powder Technology}, publisher={Elsevier BV}, author={Massopo,
Orlando and Tischendorf, Ricardo and Gonchikzhapov, Munko and Kasper, Tina and
Augustin, Peter and Özer, Burak and Reddemann, Manuel and Kneer, Reinhold and
Sheikh, Mohammed-Ali and Mert, Aydan Akyildiz and et al.}, year={2025} }'
chicago: Massopo, Orlando, Ricardo Tischendorf, Munko Gonchikzhapov, Tina Kasper,
Peter Augustin, Burak Özer, Manuel Reddemann, et al. “Influence of Dispersion
Gas Flow on the Spray Characteristics and γ-Fe2O3 Nanoparticles Formation and
Properties in Reference SpraySyn Burners.” Powder Technology 470 (2025).
https://doi.org/10.1016/j.powtec.2025.121992.
ieee: 'O. Massopo et al., “Influence of dispersion gas flow on the spray
characteristics and γ-Fe2O3 nanoparticles formation and properties in reference
SpraySyn burners,” Powder Technology, vol. 470, Art. no. 121992, 2025,
doi: 10.1016/j.powtec.2025.121992.'
mla: Massopo, Orlando, et al. “Influence of Dispersion Gas Flow on the Spray Characteristics
and γ-Fe2O3 Nanoparticles Formation and Properties in Reference SpraySyn Burners.”
Powder Technology, vol. 470, 121992, Elsevier BV, 2025, doi:10.1016/j.powtec.2025.121992.
short: O. Massopo, R. Tischendorf, M. Gonchikzhapov, T. Kasper, P. Augustin, B.
Özer, M. Reddemann, R. Kneer, M.-A. Sheikh, A.A. Mert, H. Wiggers, H.-J. Schmid,
Powder Technology 470 (2025).
date_created: 2026-02-02T11:41:04Z
date_updated: 2026-02-25T07:45:44Z
doi: 10.1016/j.powtec.2025.121992
intvolume: ' 470'
keyword:
- Spray flame synthesis
- iron oxide nanoparticle
- SpraySyn burner
- Dispersion gas
- Coaxial atomization
- HiaT-SMPS
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
publication: Powder Technology
publication_identifier:
issn:
- 0032-5910
publication_status: published
publisher: Elsevier BV
status: public
title: Influence of dispersion gas flow on the spray characteristics and γ-Fe2O3 nanoparticles
formation and properties in reference SpraySyn burners
type: journal_article
user_id: '98419'
volume: 470
year: '2025'
...
---
_id: '55999'
abstract:
- lang: eng
text: Clean hydrogen is a key aspect of carbon neutrality, necessitating robust
methods for monitoring hydrogen concentration in critical infrastructures like
pipelines or power plants. While semiconducting metal oxides such as In2O3 can
monitor gas concentrations down to the ppm range, they often exhibit cross-sensitivity
to other gases like H2O. In this study, we investigated whether cyclic optical
illumination of a gas-sensitive In2O3 layer creates identifiable changes in a
gas sensor´s electronic resistance that can be linked to H2 and H2O concentrations
via machine learning. We exposed nanostructured In2O3 with a large surface area
of 95 m2 g-1 to H2 concentrations (0-800 ppm) and relative humidity (0-70%) under
cyclic activation utilizing blue light. The sensors were tested for 20 classes
of gas combinations. A support vector machine achieved classification rates up
to 92.0%, with reliable reproducibility (88.2 ± 2.7%) across five individual sensors
using 10-fold cross-validation. Our findings suggest that cyclic optical activation
can be used as a tool to classify H2 and H2O concentrations.
article_type: original
author:
- first_name: 'Dominik '
full_name: 'Baier, Dominik '
last_name: Baier
- first_name: 'Alexander '
full_name: 'Krüger, Alexander '
last_name: Krüger
- first_name: 'Thorsten '
full_name: 'Wagner, Thorsten '
last_name: Wagner
- first_name: Michael
full_name: Tiemann, Michael
id: '23547'
last_name: Tiemann
orcid: 0000-0003-1711-2722
- first_name: Christian
full_name: Weinberger, Christian
id: '11848'
last_name: Weinberger
citation:
ama: 'Baier D, Krüger A, Wagner T, Tiemann M, Weinberger C. Gas Sensing with Nanoporous
In2O3 under Cyclic Optical Activation: Machine Learning-Aided Classification of
H2 and H2O. Chemosensors. 2024;12(9):178. doi:10.3390/chemosensors12090178'
apa: 'Baier, D., Krüger, A., Wagner, T., Tiemann, M., & Weinberger, C. (2024).
Gas Sensing with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided
Classification of H2 and H2O. Chemosensors, 12(9), 178. https://doi.org/10.3390/chemosensors12090178'
bibtex: '@article{Baier_Krüger_Wagner_Tiemann_Weinberger_2024, title={Gas Sensing
with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided
Classification of H2 and H2O}, volume={12}, DOI={10.3390/chemosensors12090178},
number={9}, journal={Chemosensors}, publisher={MDPI}, author={Baier, Dominik and
Krüger, Alexander and Wagner, Thorsten and Tiemann, Michael and Weinberger,
Christian}, year={2024}, pages={178} }'
chicago: 'Baier, Dominik , Alexander Krüger, Thorsten Wagner, Michael Tiemann,
and Christian Weinberger. “Gas Sensing with Nanoporous In2O3 under Cyclic Optical
Activation: Machine Learning-Aided Classification of H2 and H2O.” Chemosensors
12, no. 9 (2024): 178. https://doi.org/10.3390/chemosensors12090178.'
ieee: 'D. Baier, A. Krüger, T. Wagner, M. Tiemann, and C. Weinberger, “Gas Sensing
with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided
Classification of H2 and H2O,” Chemosensors, vol. 12, no. 9, p. 178, 2024,
doi: 10.3390/chemosensors12090178.'
mla: 'Baier, Dominik, et al. “Gas Sensing with Nanoporous In2O3 under Cyclic Optical
Activation: Machine Learning-Aided Classification of H2 and H2O.” Chemosensors,
vol. 12, no. 9, MDPI, 2024, p. 178, doi:10.3390/chemosensors12090178.'
short: D. Baier, A. Krüger, T. Wagner, M. Tiemann, C. Weinberger, Chemosensors 12
(2024) 178.
date_created: 2024-09-03T13:49:42Z
date_updated: 2025-11-26T12:14:21Z
ddc:
- '540'
department:
- _id: '2'
- _id: '307'
doi: 10.3390/chemosensors12090178
file:
- access_level: closed
content_type: application/pdf
creator: cweinber
date_created: 2024-09-03T13:58:18Z
date_updated: 2024-09-03T13:58:18Z
file_id: '56000'
file_name: chemosensors-12-00178.pdf
file_size: 3275869
relation: main_file
success: 1
file_date_updated: 2024-09-03T13:58:18Z
has_accepted_license: '1'
intvolume: ' 12'
issue: '9'
keyword:
- resistive gas sensor
- chemiresistor
- semiconductor
- metal oxide
- In2O3
- mesoporous
- hydrogen
- humidtiy
- machine learning
- sustainable
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.mdpi.com/2227-9040/12/9/178
oa: '1'
page: '178'
publication: Chemosensors
publication_identifier:
issn:
- 2227-9040
publication_status: published
publisher: MDPI
quality_controlled: '1'
status: public
title: 'Gas Sensing with Nanoporous In2O3 under Cyclic Optical Activation: Machine
Learning-Aided Classification of H2 and H2O'
type: journal_article
user_id: '11848'
volume: 12
year: '2024'
...
---
_id: '51136'
abstract:
- lang: eng
text: "Iron oxide nanoparticles are very interesting for many applications in different
industrial sectors. A promising\r\nprocess to manufacture these nanoparticles
is flame spray pyrolysis (FSP). A lack of understanding of the\r\nindividual sub-processes
in FSP makes it challenging to tailor nanoparticle properties. This work provides\r\ninsights
into the formation of iron oxide nanoparticles in a turbulent spray flame using
Large Eddy Simulations\r\n(LES), which are based on a comprehensive model, including
customized submodels. Highlights are the\r\nadaption of a turbulent combustion
model and a bivariate hybrid method of moments for modeling nanoparticle\r\ndynamics.
The work focuses on the SpraySyn burner, which is a standardized laboratory burner
and was\r\noperated with a precursor-solvent mixture of ethanol and iron(III)
nitrate nonahydrate. For studying the\r\nrelevance of precursor chemistry, LES
using an evaporation-limited precursor chemistry model is compared\r\nwith a model
that includes detailed iron chemistry. A further novelty is the inclusion of adsorption
in the\r\nsimulation, which defines a third model for comparison. Sufficient validation
is achieved for the undoped LES\r\nusing experimental data from the literature.
A strong impact of the detailed iron chemistry and adsorption\r\nis found on the
precursor consumption and the aggregate and primary particle formation. Comparing
the\r\nparticle diameters with experimental measurements from the literature and
data generated for this work is\r\nfound unsuitable to asses the precursor chemistry
model and revealed an urgent need for future experimental\r\nand numerical research.
This work serves as a step forward in realizing a reliable model."
citation:
ama: Fröde F, Grenga T, Pitsch H, et al., eds. Large Eddy Simulation of Iron
Oxide Formation in a Laboratory Spray Flame. Elsevier; 2023. doi:https://doi.org/10.1016/j.jaecs.2023.100191
apa: Large eddy simulation of iron oxide formation in a laboratory spray flame.
(2023). In F. Fröde, T. Grenga, H. Pitsch, S. Dupont, R. Kneer, R. Tischendorf,
O. Massopo, & H.-J. Schmid (Eds.), Applications in Energy and Combustion
Science. Elsevier. https://doi.org/10.1016/j.jaecs.2023.100191
bibtex: '@book{Fröde_Grenga_Pitsch_Dupont_Kneer_Tischendorf_Massopo_Schmid_2023,
title={Large eddy simulation of iron oxide formation in a laboratory spray flame},
DOI={https://doi.org/10.1016/j.jaecs.2023.100191},
journal={Applications in Energy and Combustion Science}, publisher={Elsevier},
year={2023} }'
chicago: Fröde, Fabian , Temistocle Grenga, Heinz Pitsch, Sophie Dupont, Reinhold
Kneer, Ricardo Tischendorf, Orlando Massopo, and Hans-Joachim Schmid, eds. Large
Eddy Simulation of Iron Oxide Formation in a Laboratory Spray Flame. Applications
in Energy and Combustion Science. Elsevier, 2023. https://doi.org/10.1016/j.jaecs.2023.100191.
ieee: F. Fröde et al., Eds., Large eddy simulation of iron oxide formation
in a laboratory spray flame. Elsevier, 2023.
mla: Fröde, Fabian, et al., editors. “Large Eddy Simulation of Iron Oxide Formation
in a Laboratory Spray Flame.” Applications in Energy and Combustion Science,
Elsevier, 2023, doi:https://doi.org/10.1016/j.jaecs.2023.100191.
short: F. Fröde, T. Grenga, H. Pitsch, S. Dupont, R. Kneer, R. Tischendorf, O. Massopo,
H.-J. Schmid, eds., Large Eddy Simulation of Iron Oxide Formation in a Laboratory
Spray Flame, Elsevier, 2023.
date_created: 2024-02-05T12:17:35Z
date_updated: 2024-02-05T12:38:43Z
department:
- _id: '150'
doi: https://doi.org/10.1016/j.jaecs.2023.100191
editor:
- first_name: 'Fabian '
full_name: 'Fröde, Fabian '
last_name: Fröde
- first_name: 'Temistocle '
full_name: 'Grenga, Temistocle '
last_name: Grenga
- first_name: 'Heinz '
full_name: 'Pitsch, Heinz '
last_name: Pitsch
- first_name: Sophie
full_name: Dupont, Sophie
last_name: Dupont
- first_name: Reinhold
full_name: Kneer, Reinhold
last_name: Kneer
- first_name: Ricardo
full_name: Tischendorf, Ricardo
id: '67002'
last_name: Tischendorf
- first_name: Orlando
full_name: Massopo, Orlando
id: '98419'
last_name: Massopo
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
has_accepted_license: '1'
keyword:
- Flame spray pyrolysis
- Iron oxide formation
- Large eddy simulation
- Method of moments
- SpraySyn
language:
- iso: eng
main_file_link:
- url: https://www.sciencedirect.com/science/article/pii/S2666352X23000808
publication: Applications in Energy and Combustion Science
publication_status: published
publisher: Elsevier
status: public
title: Large eddy simulation of iron oxide formation in a laboratory spray flame
type: journal_editor
user_id: '98419'
year: '2023'
...
---
_id: '43441'
abstract:
- lang: eng
text: "This paper reveals the 3D character of the intermetallic layer at the aluminum–steel
interface which pops\r\nup above the original sample surface during annealing.
Popping out of the intermetallics was proven using\r\natomic force microscopy.
The phase expands out of the plane due to the exothermic formation of the Al5Fe2\r\nphase
and the feasibility of surface diffusion. Milling by a focused ion beam enabled
the comparison of the\r\nchemical composition of the surface layer with the bulk
interface, showing no difference. The growth direction\r\nis both towards aluminum
and steel — the main diffusion flux is from aluminum towards steel, and the new\r\nintermetallic
phase emerges at the steel side. The shortage of Al atoms causes a shift of the
intermetallic as a\r\nwhole towards aluminum."
article_number: '112043'
article_type: original
author:
- first_name: Michaela
full_name: Šlapáková, Michaela
last_name: Šlapáková
- first_name: Barbora
full_name: Kihoulou, Barbora
last_name: Kihoulou
- first_name: Jozef
full_name: Veselý, Jozef
last_name: Veselý
- first_name: Peter
full_name: Minárik, Peter
last_name: Minárik
- first_name: Klaudia
full_name: Fekete, Klaudia
last_name: Fekete
- first_name: Michal
full_name: Knapek, Michal
last_name: Knapek
- first_name: Rostislav
full_name: Králík, Rostislav
last_name: Králík
- first_name: Olexandr
full_name: Grydin, Olexandr
id: '43822'
last_name: Grydin
- first_name: Mykhailo
full_name: Stolbchenko, Mykhailo
last_name: Stolbchenko
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: Šlapáková M, Kihoulou B, Veselý J, et al. 3D-structure of intermetallic interface
layer in Al–steel clad material. Vacuum. 2023;212. doi:10.1016/j.vacuum.2023.112043
apa: Šlapáková, M., Kihoulou, B., Veselý, J., Minárik, P., Fekete, K., Knapek, M.,
Králík, R., Grydin, O., Stolbchenko, M., & Schaper, M. (2023). 3D-structure
of intermetallic interface layer in Al–steel clad material. Vacuum, 212,
Article 112043. https://doi.org/10.1016/j.vacuum.2023.112043
bibtex: '@article{Šlapáková_Kihoulou_Veselý_Minárik_Fekete_Knapek_Králík_Grydin_Stolbchenko_Schaper_2023,
title={3D-structure of intermetallic interface layer in Al–steel clad material},
volume={212}, DOI={10.1016/j.vacuum.2023.112043},
number={112043}, journal={Vacuum}, publisher={Elsevier BV}, author={Šlapáková,
Michaela and Kihoulou, Barbora and Veselý, Jozef and Minárik, Peter and Fekete,
Klaudia and Knapek, Michal and Králík, Rostislav and Grydin, Olexandr and Stolbchenko,
Mykhailo and Schaper, Mirko}, year={2023} }'
chicago: Šlapáková, Michaela, Barbora Kihoulou, Jozef Veselý, Peter Minárik, Klaudia
Fekete, Michal Knapek, Rostislav Králík, Olexandr Grydin, Mykhailo Stolbchenko,
and Mirko Schaper. “3D-Structure of Intermetallic Interface Layer in Al–Steel
Clad Material.” Vacuum 212 (2023). https://doi.org/10.1016/j.vacuum.2023.112043.
ieee: 'M. Šlapáková et al., “3D-structure of intermetallic interface layer
in Al–steel clad material,” Vacuum, vol. 212, Art. no. 112043, 2023, doi:
10.1016/j.vacuum.2023.112043.'
mla: Šlapáková, Michaela, et al. “3D-Structure of Intermetallic Interface Layer
in Al–Steel Clad Material.” Vacuum, vol. 212, 112043, Elsevier BV, 2023,
doi:10.1016/j.vacuum.2023.112043.
short: M. Šlapáková, B. Kihoulou, J. Veselý, P. Minárik, K. Fekete, M. Knapek, R.
Králík, O. Grydin, M. Stolbchenko, M. Schaper, Vacuum 212 (2023).
date_created: 2023-04-08T17:24:40Z
date_updated: 2023-06-01T14:22:15Z
department:
- _id: '158'
doi: 10.1016/j.vacuum.2023.112043
intvolume: ' 212'
keyword:
- Al-steel clad
- twin-roll casting
- 3D characterization
- atomic force microscopy
- diffusion direction
- surface growth
language:
- iso: eng
publication: Vacuum
publication_identifier:
issn:
- 0042-207X
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: 3D-structure of intermetallic interface layer in Al–steel clad material
type: journal_article
user_id: '43720'
volume: 212
year: '2023'
...
---
_id: '36335'
abstract:
- lang: eng
text: Transformation of Fe- and Cu-rich primary phase particles was studied in an
Al-Li-based alloy prepared by twin-roll casting. Thin foils for combined STEM
and SEM experiments were prepared by electrolytic twin-jet polishing. They were
in-situ heated in a TEM heating stage and observed at 200 kV in the JEOL JEM 2200FS
electron microscope equipped with STEM HAADF and BF detectors and SEM BSE and
SE detectors working both in composition and topographic modes. The resulting
structures were combined with EDS mapping performed directly in the heating holder.
Dissolution and transformation of Cu- and Fe-rich particles occur above 500 °C.
EDS maps acquired on the foil cooled down to room temperature show that Cu and
Fe are both still present in newly formed particles, most likely indicating the
presence of the Al7Cu2Fe phase.
author:
- first_name: Miroslav
full_name: CIESLAR, Miroslav
last_name: CIESLAR
- first_name: Barbora
full_name: KŘIVSKÁ, Barbora
last_name: KŘIVSKÁ
- first_name: Rostislav
full_name: KRÁLÍK, Rostislav
last_name: KRÁLÍK
- first_name: Lucia
full_name: BAJTOŠOVÁ, Lucia
last_name: BAJTOŠOVÁ
- first_name: Olexandr
full_name: Grydin, Olexandr
id: '43822'
last_name: Grydin
- first_name: Mykhailo
full_name: STOLBCHENKO, Mykhailo
last_name: STOLBCHENKO
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
citation:
ama: 'CIESLAR M, KŘIVSKÁ B, KRÁLÍK R, et al. HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED
ALLOY STUDIED BY IN-SITU ELECTRON MICROSCOPY. In: METAL 2022 Conference Proeedings.
TANGER Ltd.; 2022. doi:10.37904/metal.2022.4438'
apa: CIESLAR, M., KŘIVSKÁ, B., KRÁLÍK, R., BAJTOŠOVÁ, L., Grydin, O., STOLBCHENKO,
M., & Schaper, M. (2022). HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY
STUDIED BY IN-SITU ELECTRON MICROSCOPY. METAL 2022 Conference Proeedings.
Metal 2022, Brno. https://doi.org/10.37904/metal.2022.4438
bibtex: '@inproceedings{CIESLAR_KŘIVSKÁ_KRÁLÍK_BAJTOŠOVÁ_Grydin_STOLBCHENKO_Schaper_2022,
title={HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY STUDIED BY IN-SITU ELECTRON
MICROSCOPY}, DOI={10.37904/metal.2022.4438},
booktitle={METAL 2022 Conference Proeedings}, publisher={TANGER Ltd.}, author={CIESLAR,
Miroslav and KŘIVSKÁ, Barbora and KRÁLÍK, Rostislav and BAJTOŠOVÁ, Lucia and Grydin,
Olexandr and STOLBCHENKO, Mykhailo and Schaper, Mirko}, year={2022} }'
chicago: CIESLAR, Miroslav, Barbora KŘIVSKÁ, Rostislav KRÁLÍK, Lucia BAJTOŠOVÁ,
Olexandr Grydin, Mykhailo STOLBCHENKO, and Mirko Schaper. “HOMOGENIZATION OF TWIN-ROLL
CAST Al-Li-BASED ALLOY STUDIED BY IN-SITU ELECTRON MICROSCOPY.” In METAL 2022
Conference Proeedings. TANGER Ltd., 2022. https://doi.org/10.37904/metal.2022.4438.
ieee: 'M. CIESLAR et al., “HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY
STUDIED BY IN-SITU ELECTRON MICROSCOPY,” presented at the Metal 2022, Brno, 2022,
doi: 10.37904/metal.2022.4438.'
mla: CIESLAR, Miroslav, et al. “HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY
STUDIED BY IN-SITU ELECTRON MICROSCOPY.” METAL 2022 Conference Proeedings,
TANGER Ltd., 2022, doi:10.37904/metal.2022.4438.
short: 'M. CIESLAR, B. KŘIVSKÁ, R. KRÁLÍK, L. BAJTOŠOVÁ, O. Grydin, M. STOLBCHENKO,
M. Schaper, in: METAL 2022 Conference Proeedings, TANGER Ltd., 2022.'
conference:
end_date: 2022-05-19
location: Brno
name: Metal 2022
start_date: 2022-05-18
date_created: 2023-01-12T09:39:41Z
date_updated: 2023-01-12T09:44:17Z
department:
- _id: '158'
- _id: '321'
doi: 10.37904/metal.2022.4438
keyword:
- Al-Li-based alloy
- in-situ TEM
- homogenization
- phase transformation
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.confer.cz/metal/2022/4438-homogenization-of-twin-roll-cast-al-li-based-alloy-studied-by-in-situ-electron-microscopy
oa: '1'
publication: METAL 2022 Conference Proeedings
publication_identifier:
issn:
- 2694-9296
publication_status: published
publisher: TANGER Ltd.
status: public
title: HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY STUDIED BY IN-SITU ELECTRON
MICROSCOPY
type: conference
user_id: '43822'
year: '2022'
...
---
_id: '36339'
abstract:
- lang: eng
text: Al-Li-based alloys are an attractive material for aircraft and aerospace applications.
Preparation of these alloys by twin-roll casting (TRC), which combines rapid metal
solidification and subsequent plastic reduction in a single processing step, could
improve the properties of the alloys compared to materials prepared by conventional
direct-chill casting. A commonly used approach for identifying primary phases
is a chemical analysis by energy dispersive spectroscopy (EDS). More accurate
results can be achieved by combining the method with diffraction analysis. This
process can be considerably simplified in microscopes equipped with automated
crystal orientation and phase mapping (ACOM-TEM). Al-Cu-Li-Mg-Zr alloy was prepared
by twin-roll casting. A combination of TEM and STEM images with chemical analysis
by EDS and ACOM-TEM was used to obtain complex information about phases of boundary
primary particles. The efficiency of the individual methods for the phase identification
in TRC Al-Li-based alloys is discussed.
author:
- first_name: Lucia
full_name: BAJTOŠOVÁ, Lucia
last_name: BAJTOŠOVÁ
- first_name: Olexandr
full_name: Grydin, Olexandr
id: '43822'
last_name: Grydin
- first_name: Mykhailo
full_name: STOLBCHENKO, Mykhailo
last_name: STOLBCHENKO
- first_name: Mirko
full_name: Schaper, Mirko
id: '43720'
last_name: Schaper
- first_name: Barbora
full_name: KŘIVSKÁ, Barbora
last_name: KŘIVSKÁ
- first_name: Rostislav
full_name: KRÁLÍK, Rostislav
last_name: KRÁLÍK
- first_name: Michaela
full_name: ŠLAPÁKOVÁ, Michaela
last_name: ŠLAPÁKOVÁ
- first_name: Miroslav
full_name: CIESLAR, Miroslav
last_name: CIESLAR
citation:
ama: 'BAJTOŠOVÁ L, Grydin O, STOLBCHENKO M, et al. Phase identification in twin-roll
cast Al-Li alloys. In: METAL 2022 Conference Proeedings. TANGER Ltd.; 2022.
doi:10.37904/metal.2022.4437'
apa: BAJTOŠOVÁ, L., Grydin, O., STOLBCHENKO, M., Schaper, M., KŘIVSKÁ, B., KRÁLÍK,
R., ŠLAPÁKOVÁ, M., & CIESLAR, M. (2022). Phase identification in twin-roll
cast Al-Li alloys. METAL 2022 Conference Proeedings. Metal 2022, Brno.
https://doi.org/10.37904/metal.2022.4437
bibtex: '@inproceedings{BAJTOŠOVÁ_Grydin_STOLBCHENKO_Schaper_KŘIVSKÁ_KRÁLÍK_ŠLAPÁKOVÁ_CIESLAR_2022,
title={Phase identification in twin-roll cast Al-Li alloys}, DOI={10.37904/metal.2022.4437},
booktitle={METAL 2022 Conference Proeedings}, publisher={TANGER Ltd.}, author={BAJTOŠOVÁ,
Lucia and Grydin, Olexandr and STOLBCHENKO, Mykhailo and Schaper, Mirko and KŘIVSKÁ,
Barbora and KRÁLÍK, Rostislav and ŠLAPÁKOVÁ, Michaela and CIESLAR, Miroslav},
year={2022} }'
chicago: BAJTOŠOVÁ, Lucia, Olexandr Grydin, Mykhailo STOLBCHENKO, Mirko Schaper,
Barbora KŘIVSKÁ, Rostislav KRÁLÍK, Michaela ŠLAPÁKOVÁ, and Miroslav CIESLAR. “Phase
Identification in Twin-Roll Cast Al-Li Alloys.” In METAL 2022 Conference Proeedings.
TANGER Ltd., 2022. https://doi.org/10.37904/metal.2022.4437.
ieee: 'L. BAJTOŠOVÁ et al., “Phase identification in twin-roll cast Al-Li
alloys,” presented at the Metal 2022, Brno, 2022, doi: 10.37904/metal.2022.4437.'
mla: BAJTOŠOVÁ, Lucia, et al. “Phase Identification in Twin-Roll Cast Al-Li Alloys.”
METAL 2022 Conference Proeedings, TANGER Ltd., 2022, doi:10.37904/metal.2022.4437.
short: 'L. BAJTOŠOVÁ, O. Grydin, M. STOLBCHENKO, M. Schaper, B. KŘIVSKÁ, R. KRÁLÍK,
M. ŠLAPÁKOVÁ, M. CIESLAR, in: METAL 2022 Conference Proeedings, TANGER Ltd., 2022.'
conference:
end_date: 2022-05-19
location: Brno
name: Metal 2022
start_date: 2022-05-18
date_created: 2023-01-12T09:42:02Z
date_updated: 2023-04-27T16:35:42Z
department:
- _id: '158'
- _id: '321'
doi: 10.37904/metal.2022.4437
keyword:
- Al-Cu-Li-M-Zr-Fe alloy
- twin-roll casting
- phase identification
- ACOM-TEM
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.confer.cz/metal/2022/4437-phase-identification-in-twin-roll-cast-al-li-alloys
oa: '1'
publication: METAL 2022 Conference Proeedings
publication_identifier:
issn:
- 2694-9296
publication_status: published
publisher: TANGER Ltd.
quality_controlled: '1'
status: public
title: Phase identification in twin-roll cast Al-Li alloys
type: conference
user_id: '43720'
year: '2022'
...
---
_id: '62813'
abstract:
- lang: eng
text: Nanostructured manganese oxides have a rich variety of morphologies and crystal
phases which can undergo transformations during synthesis and application. Although
these structural features are crucial for their performance, the mechanisms behind
such transitions are not well understood. Herein, we describe the mechanism of
transformation from layered 2D δ-MnO2 nanosheets to the scarcely reported γ-MnO2
nanocone morphology. Despite the common purpose of introducing Fe dopants to enhance
the conductivity of layered manganese oxides, the Fe galvanic exchange reaction
was found responsible for such coupled phase/morphology transition. Electrochemical
characterization confirmed a distinct electrochemical behaviour of the nanocones,
emphasizing the need to unravel the mechanism of 2D MnO2 transformation. Such
mechanistic insights were gained by systematic and rigorous electron microscopy
studies. The effect of the local chemical composition was determined by energy
dispersive X-ray spectroscopy while electron energy loss spectroscopy unravelled
the key influence of the oxidation state of Mn ions within nanosheets and nanocones.
We propose and demonstrate a Mn2+-mediated oxidative mechanism of coupled morphology/phase
transformation subjected to the equilibrium of Fe and Mn ions during galvanic
exchange reaction. These findings contribute to the understanding of the growth
and morphology/phase transformations of manganese oxide nanostructures, providing
insights for the rational design of nanomaterials.
article_type: original
author:
- first_name: Raquel
full_name: Aymerich-Armengol, Raquel
last_name: Aymerich-Armengol
- first_name: Paolo
full_name: Cignoni, Paolo
last_name: Cignoni
- first_name: Petra
full_name: Ebbinghaus, Petra
last_name: Ebbinghaus
- first_name: Julia
full_name: Linnemann, Julia
id: '116779'
last_name: Linnemann
orcid: 0000-0001-6883-5424
- first_name: Martin
full_name: Rabe, Martin
last_name: Rabe
- first_name: Kristina
full_name: Tschulik, Kristina
last_name: Tschulik
- first_name: Christina
full_name: Scheu, Christina
last_name: Scheu
- first_name: Joohyun
full_name: Lim, Joohyun
last_name: Lim
citation:
ama: Aymerich-Armengol R, Cignoni P, Ebbinghaus P, et al. Mechanism of coupled phase/morphology
transformation of 2D manganese oxides through Fe galvanic exchange reaction. Journal
of Materials Chemistry A. 2022;10(45):24190-24198. doi:10.1039/d2ta06552e
apa: Aymerich-Armengol, R., Cignoni, P., Ebbinghaus, P., Linnemann, J., Rabe, M.,
Tschulik, K., Scheu, C., & Lim, J. (2022). Mechanism of coupled phase/morphology
transformation of 2D manganese oxides through Fe galvanic exchange reaction. Journal
of Materials Chemistry A, 10(45), 24190–24198. https://doi.org/10.1039/d2ta06552e
bibtex: '@article{Aymerich-Armengol_Cignoni_Ebbinghaus_Linnemann_Rabe_Tschulik_Scheu_Lim_2022,
title={Mechanism of coupled phase/morphology transformation of 2D manganese oxides
through Fe galvanic exchange reaction}, volume={10}, DOI={10.1039/d2ta06552e},
number={45}, journal={Journal of Materials Chemistry A}, publisher={Royal Society
of Chemistry (RSC)}, author={Aymerich-Armengol, Raquel and Cignoni, Paolo and
Ebbinghaus, Petra and Linnemann, Julia and Rabe, Martin and Tschulik, Kristina
and Scheu, Christina and Lim, Joohyun}, year={2022}, pages={24190–24198} }'
chicago: 'Aymerich-Armengol, Raquel, Paolo Cignoni, Petra Ebbinghaus, Julia Linnemann,
Martin Rabe, Kristina Tschulik, Christina Scheu, and Joohyun Lim. “Mechanism of
Coupled Phase/Morphology Transformation of 2D Manganese Oxides through Fe Galvanic
Exchange Reaction.” Journal of Materials Chemistry A 10, no. 45 (2022):
24190–98. https://doi.org/10.1039/d2ta06552e.'
ieee: 'R. Aymerich-Armengol et al., “Mechanism of coupled phase/morphology
transformation of 2D manganese oxides through Fe galvanic exchange reaction,”
Journal of Materials Chemistry A, vol. 10, no. 45, pp. 24190–24198, 2022,
doi: 10.1039/d2ta06552e.'
mla: Aymerich-Armengol, Raquel, et al. “Mechanism of Coupled Phase/Morphology Transformation
of 2D Manganese Oxides through Fe Galvanic Exchange Reaction.” Journal of Materials
Chemistry A, vol. 10, no. 45, Royal Society of Chemistry (RSC), 2022, pp.
24190–98, doi:10.1039/d2ta06552e.
short: R. Aymerich-Armengol, P. Cignoni, P. Ebbinghaus, J. Linnemann, M. Rabe, K.
Tschulik, C. Scheu, J. Lim, Journal of Materials Chemistry A 10 (2022) 24190–24198.
date_created: 2025-12-03T16:02:15Z
date_updated: 2025-12-03T16:30:43Z
department:
- _id: '985'
doi: 10.1039/d2ta06552e
extern: '1'
intvolume: ' 10'
issue: '45'
keyword:
- manganese oxide
- nanomaterials
- TEM
- supercapacitors
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
page: 24190-24198
publication: Journal of Materials Chemistry A
publication_identifier:
issn:
- 2050-7488
- 2050-7496
publication_status: published
publisher: Royal Society of Chemistry (RSC)
quality_controlled: '1'
status: public
title: Mechanism of coupled phase/morphology transformation of 2D manganese oxides
through Fe galvanic exchange reaction
type: journal_article
user_id: '116779'
volume: 10
year: '2022'
...
---
_id: '59220'
author:
- first_name: Tobias
full_name: Schwabe, Tobias
id: '39217'
last_name: Schwabe
- first_name: Axel
full_name: Balke, Axel
last_name: Balke
- first_name: Petrone H.
full_name: Bezuidenhout, Petrone H.
last_name: Bezuidenhout
- first_name: Julia
full_name: Reker, Julia
last_name: Reker
- first_name: Thorsten
full_name: Meyers, Thorsten
last_name: Meyers
- first_name: Trudi-Heleen
full_name: Joubert, Trudi-Heleen
last_name: Joubert
- first_name: Ulrich
full_name: Hilleringmann, Ulrich
id: '20179'
last_name: Hilleringmann
citation:
ama: 'Schwabe T, Balke A, Bezuidenhout PH, et al. Oxygen detection with zinc oxide
nanoparticle structures. In: du Plessis M, ed. Fifth Conference on Sensors,
MEMS, and Electro-Optic Systems. Vol 11043. SPIE; 2019:1104316. doi:10.1117/12.2501507'
apa: Schwabe, T., Balke, A., Bezuidenhout, P. H., Reker, J., Meyers, T., Joubert,
T.-H., & Hilleringmann, U. (2019). Oxygen detection with zinc oxide nanoparticle
structures. In M. du Plessis (Ed.), Fifth Conference on Sensors, MEMS, and
Electro-Optic Systems (Vol. 11043, p. 1104316). SPIE. https://doi.org/10.1117/12.2501507
bibtex: '@inproceedings{Schwabe_Balke_Bezuidenhout_Reker_Meyers_Joubert_Hilleringmann_2019,
title={Oxygen detection with zinc oxide nanoparticle structures}, volume={11043},
DOI={10.1117/12.2501507}, booktitle={Fifth
Conference on Sensors, MEMS, and Electro-Optic Systems}, publisher={SPIE}, author={Schwabe,
Tobias and Balke, Axel and Bezuidenhout, Petrone H. and Reker, Julia and Meyers,
Thorsten and Joubert, Trudi-Heleen and Hilleringmann, Ulrich}, editor={du Plessis,
Monuko}, year={2019}, pages={1104316} }'
chicago: Schwabe, Tobias, Axel Balke, Petrone H. Bezuidenhout, Julia Reker, Thorsten
Meyers, Trudi-Heleen Joubert, and Ulrich Hilleringmann. “Oxygen Detection with
Zinc Oxide Nanoparticle Structures.” In Fifth Conference on Sensors, MEMS,
and Electro-Optic Systems, edited by Monuko du Plessis, 11043:1104316. SPIE,
2019. https://doi.org/10.1117/12.2501507.
ieee: 'T. Schwabe et al., “Oxygen detection with zinc oxide nanoparticle
structures,” in Fifth Conference on Sensors, MEMS, and Electro-Optic Systems,
2019, vol. 11043, p. 1104316, doi: 10.1117/12.2501507.'
mla: Schwabe, Tobias, et al. “Oxygen Detection with Zinc Oxide Nanoparticle Structures.”
Fifth Conference on Sensors, MEMS, and Electro-Optic Systems, edited by
Monuko du Plessis, vol. 11043, SPIE, 2019, p. 1104316, doi:10.1117/12.2501507.
short: 'T. Schwabe, A. Balke, P.H. Bezuidenhout, J. Reker, T. Meyers, T.-H. Joubert,
U. Hilleringmann, in: M. du Plessis (Ed.), Fifth Conference on Sensors, MEMS,
and Electro-Optic Systems, SPIE, 2019, p. 1104316.'
date_created: 2025-03-31T16:06:43Z
date_updated: 2025-04-02T11:34:07Z
doi: 10.1117/12.2501507
editor:
- first_name: Monuko
full_name: du Plessis, Monuko
last_name: du Plessis
intvolume: ' 11043'
keyword:
- sensing
- zinc oxide
- thin-film transistor
- oxygen measurement
- low-cost electronics
- water quality analysis
- printable electronics
- flexible electronics
language:
- iso: eng
page: '1104316'
publication: Fifth Conference on Sensors, MEMS, and Electro-Optic Systems
publisher: SPIE
status: public
title: Oxygen detection with zinc oxide nanoparticle structures
type: conference
user_id: '39217'
volume: 11043
year: '2019'
...
---
_id: '13187'
abstract:
- lang: eng
text: Abstract The reaction of Cu(I) bisguanidine complexes with nitric oxide and
the formation of intermediate species were monitored via UV-vis spectroscopy at
low temperature, with the occurrence of characteristic absorption bands. The origin
of the emerging species and their character were substantiated by electron paramagnetic
resonance (EPR) measurements and density functional theory (DFT) studies showing
a delocalized {CuNO}11 radical species. Furthermore, this system was transferred
to the SuperFocus mixer setup, which allows rapid mixing and the determination
of decay constants at ambient temperatures of the thermally sensitive species.
However, these experiments demonstrated the limits of these systems, such as the
NO saturation in organic solvents and a preferably precise temperature control
within the SuperFocus mixer, which should be addressed in the future.
author:
- first_name: Alexander
full_name: Oppermann, Alexander
last_name: Oppermann
- first_name: Larissa
full_name: Laurini, Larissa
last_name: Laurini
- first_name: Fabian
full_name: Etscheidt, Fabian
last_name: Etscheidt
- first_name: Katharina
full_name: Hollmann, Katharina
last_name: Hollmann
- first_name: Florian
full_name: Strassl, Florian
last_name: Strassl
- first_name: Alexander
full_name: Hoffmann, Alexander
last_name: Hoffmann
- first_name: Daniela
full_name: Schurr, Daniela
last_name: Schurr
- first_name: Roland
full_name: Dittmeyer, Roland
last_name: Dittmeyer
- first_name: Günter
full_name: Rinke, Günter
last_name: Rinke
- first_name: Sonja
full_name: Herres-Pawlis, Sonja
last_name: Herres-Pawlis
citation:
ama: Oppermann A, Laurini L, Etscheidt F, et al. Detection of Copper Bisguanidine
NO Adducts by UV-vis Spectroscopy and a SuperFocus Mixer. Chemical Engineering
\& Technology. 2017;40(8):1475-1483. doi:10.1002/ceat.201600691
apa: Oppermann, A., Laurini, L., Etscheidt, F., Hollmann, K., Strassl, F., Hoffmann,
A., … Herres-Pawlis, S. (2017). Detection of Copper Bisguanidine NO Adducts by
UV-vis Spectroscopy and a SuperFocus Mixer. Chemical Engineering \& Technology,
40(8), 1475–1483. https://doi.org/10.1002/ceat.201600691
bibtex: '@article{Oppermann_Laurini_Etscheidt_Hollmann_Strassl_Hoffmann_Schurr_Dittmeyer_Rinke_Herres-Pawlis_2017,
title={Detection of Copper Bisguanidine NO Adducts by UV-vis Spectroscopy and
a SuperFocus Mixer}, volume={40}, DOI={10.1002/ceat.201600691},
number={8}, journal={Chemical Engineering \& Technology}, author={Oppermann,
Alexander and Laurini, Larissa and Etscheidt, Fabian and Hollmann, Katharina and
Strassl, Florian and Hoffmann, Alexander and Schurr, Daniela and Dittmeyer, Roland
and Rinke, Günter and Herres-Pawlis, Sonja}, year={2017}, pages={1475–1483} }'
chicago: 'Oppermann, Alexander, Larissa Laurini, Fabian Etscheidt, Katharina Hollmann,
Florian Strassl, Alexander Hoffmann, Daniela Schurr, Roland Dittmeyer, Günter
Rinke, and Sonja Herres-Pawlis. “Detection of Copper Bisguanidine NO Adducts by
UV-Vis Spectroscopy and a SuperFocus Mixer.” Chemical Engineering \& Technology
40, no. 8 (2017): 1475–83. https://doi.org/10.1002/ceat.201600691.'
ieee: A. Oppermann et al., “Detection of Copper Bisguanidine NO Adducts by
UV-vis Spectroscopy and a SuperFocus Mixer,” Chemical Engineering \& Technology,
vol. 40, no. 8, pp. 1475–1483, 2017.
mla: Oppermann, Alexander, et al. “Detection of Copper Bisguanidine NO Adducts by
UV-Vis Spectroscopy and a SuperFocus Mixer.” Chemical Engineering \& Technology,
vol. 40, no. 8, 2017, pp. 1475–83, doi:10.1002/ceat.201600691.
short: A. Oppermann, L. Laurini, F. Etscheidt, K. Hollmann, F. Strassl, A. Hoffmann,
D. Schurr, R. Dittmeyer, G. Rinke, S. Herres-Pawlis, Chemical Engineering \&
Technology 40 (2017) 1475–1483.
date_created: 2019-09-11T11:01:30Z
date_updated: 2022-01-06T06:51:30Z
doi: 10.1002/ceat.201600691
intvolume: ' 40'
issue: '8'
keyword:
- Copper guanidine complexes
- Nitric oxide
- SuperFocus mixer
language:
- iso: eng
page: 1475-1483
project:
- _id: '52'
name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Chemical Engineering \& Technology
status: public
title: Detection of Copper Bisguanidine NO Adducts by UV-vis Spectroscopy and a SuperFocus
Mixer
type: journal_article
user_id: '40778'
volume: 40
year: '2017'
...
---
_id: '63920'
abstract:
- lang: eng
text: Coordinatively unsaturated sites (CUS) present a key feature of alumina based
catalysts as they are believed to act as Lewis-acid sites in heterogeneously catalyzed
reactions. In the present study, the direct observation of active species on a
fluoride-doped aluminum oxide catalyst is demonstrated. This new fluoride-doped
aluminum oxide exhibits strong Lewis-acid sites and superior catalytic activity
as compared to gamma-Al2O3. To emphasize the labile state of Lewis-acid sites,
two distinctive states of the catalysts surface are addressed using H-1-Al-27
cross polarization (CP) MAS NMR. On the one hand, the highly dehydrated and active
state after calcination at 700 degrees C and on the other hand the rehydrated
and catalytically inactive surface (produced by contact to air) are probed. These
experiments revealed the presence of significant amounts of coordinatively unsaturated
sites in the form of 4-and 5-fold coordinated Al-sites on the highly dehydrated
surface. In contrast to this, the rehydrated sample exhibited a severely restructured
surface caused by the chemisorption of H2O which is ’constituted in a manner that
was proposed in earlier models for gamma-Al2O3 surfaces.
author:
- first_name: L.
full_name: Ahrem, L.
last_name: Ahrem
- first_name: G.
full_name: Scholz, G.
last_name: Scholz
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: B.
full_name: Calvo, B.
last_name: Calvo
- first_name: G.
full_name: Buntkowsky, G.
last_name: Buntkowsky
- first_name: E.
full_name: Kemnitz, E.
last_name: Kemnitz
citation:
ama: Ahrem L, Scholz G, Gutmann T, Calvo B, Buntkowsky G, Kemnitz E. Direct Observation
of Coordinatively Unsaturated Sites on the Surface of a Fluoride-Doped Alumina
Catalyst. Journal of Physical Chemistry C. 2017;121(22):12206–12213. doi:10.1021/acs.jpcc.7b02535
apa: Ahrem, L., Scholz, G., Gutmann, T., Calvo, B., Buntkowsky, G., & Kemnitz,
E. (2017). Direct Observation of Coordinatively Unsaturated Sites on the Surface
of a Fluoride-Doped Alumina Catalyst. Journal of Physical Chemistry C,
121(22), 12206–12213. https://doi.org/10.1021/acs.jpcc.7b02535
bibtex: '@article{Ahrem_Scholz_Gutmann_Calvo_Buntkowsky_Kemnitz_2017, title={Direct
Observation of Coordinatively Unsaturated Sites on the Surface of a Fluoride-Doped
Alumina Catalyst}, volume={121}, DOI={10.1021/acs.jpcc.7b02535},
number={22}, journal={Journal of Physical Chemistry C}, author={Ahrem, L. and
Scholz, G. and Gutmann, Torsten and Calvo, B. and Buntkowsky, G. and Kemnitz,
E.}, year={2017}, pages={12206–12213} }'
chicago: 'Ahrem, L., G. Scholz, Torsten Gutmann, B. Calvo, G. Buntkowsky, and E.
Kemnitz. “Direct Observation of Coordinatively Unsaturated Sites on the Surface
of a Fluoride-Doped Alumina Catalyst.” Journal of Physical Chemistry C
121, no. 22 (2017): 12206–12213. https://doi.org/10.1021/acs.jpcc.7b02535.'
ieee: 'L. Ahrem, G. Scholz, T. Gutmann, B. Calvo, G. Buntkowsky, and E. Kemnitz,
“Direct Observation of Coordinatively Unsaturated Sites on the Surface of a Fluoride-Doped
Alumina Catalyst,” Journal of Physical Chemistry C, vol. 121, no. 22, pp.
12206–12213, 2017, doi: 10.1021/acs.jpcc.7b02535.'
mla: Ahrem, L., et al. “Direct Observation of Coordinatively Unsaturated Sites on
the Surface of a Fluoride-Doped Alumina Catalyst.” Journal of Physical Chemistry
C, vol. 121, no. 22, 2017, pp. 12206–12213, doi:10.1021/acs.jpcc.7b02535.
short: L. Ahrem, G. Scholz, T. Gutmann, B. Calvo, G. Buntkowsky, E. Kemnitz, Journal
of Physical Chemistry C 121 (2017) 12206–12213.
date_created: 2026-02-07T08:56:18Z
date_updated: 2026-02-17T16:19:24Z
doi: 10.1021/acs.jpcc.7b02535
extern: '1'
intvolume: ' 121'
issue: '22'
keyword:
- al-27 nmr
- characterization
- Chemistry
- cross-polarization
- dynamic nuclear-polarization
- eta-alumina
- gamma-alumina
- hydroxy fluorides
- ions
- Materials Science
- pentacoordinated al3+
- Science & Technology - Other Topics
- solid-state nmr
- spectroscopic
- structural insights
language:
- iso: eng
page: 12206–12213
publication: Journal of Physical Chemistry C
publication_identifier:
issn:
- 1932-7447
status: public
title: Direct Observation of Coordinatively Unsaturated Sites on the Surface of a
Fluoride-Doped Alumina Catalyst
type: journal_article
user_id: '100715'
volume: 121
year: '2017'
...
---
_id: '9959'
abstract:
- lang: eng
text: Ultrasonic heavy wire bonding is a commonly used technology to conduct electrical
devices in power electronics. In order to facilitate powerful solutions combined
with an increased efficiency, involving a material change from aluminum to copper
wire as conductor material takes place in recent years. Due to the material related
properties, copper wire bonding requires significant higher bond processing parameters
such as bond force and ultrasonic power compared to aluminum which can lead to
damages or a failure of the bonded component. Therefore, a profound knowledge
of the processes prevailing during wire bonding is essential to optimize the application
of the copper wires and consequently to achieve the demands on quality and reliability.
The behavior of different natural surface oxides of aluminum and copper are assumed
to be one reason for the deviation in the required bond parameters. Accordingly,
the impact of differently pre-treated substrates surfaces on which the bonding
is applied were investigated in this study. First, all conditions investigated
(as-received, oxidefree, AlOx and the CuOx) were characterized by utilizing scanning
electron microscopy, energy dispersive X-ray spectroscopy, focused ion beam microscopy
and atomic force microscopy. In addition, hardness tests were performed as well
as perthometer measurements. Afterwards, a 500 $\mu$ m copper wire was bonded
on the generated surfaces investigated. In consideration of the roughness, shear
test of various bond times and microscopic images were evaluated. Finally, the
results were compared and discussed. Overall, the current study indicates that
an Al-oxide layer is beneficial for welding process in Cu wire bonding. On the
contrary, the Cu-oxide is detrimental and leads to a delayed welding of the joining
parts. Based on the obtained results, it can be expected that due to an ideal
set of Al-oxide layers, lower optimal bond parameters can used to reach high bond
strength with good reliability properties.
author:
- first_name: Florian
full_name: Eacock, Florian
last_name: Eacock
- first_name: Andreas
full_name: Unger, Andreas
last_name: Unger
- first_name: Paul
full_name: Eichwald, Paul
last_name: Eichwald
- first_name: Olexandr
full_name: Grydin, Olexandr
last_name: Grydin
- first_name: Florian
full_name: Hengsbach, Florian
last_name: Hengsbach
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Mirko
full_name: Schaper, Mirko
last_name: Schaper
- first_name: Karsten
full_name: Guth, Karsten
last_name: Guth
citation:
ama: 'Eacock F, Unger A, Eichwald P, et al. Effect of different oxide layers on
the ultrasonic copper wire bond process. In: IEEE 66th Electronic Components
and Technology Conference. ; 2016:2111-2118. doi:10.1109/ECTC.2016.91'
apa: Eacock, F., Unger, A., Eichwald, P., Grydin, O., Hengsbach, F., Althoff, S.,
… Guth, K. (2016). Effect of different oxide layers on the ultrasonic copper wire
bond process. In IEEE 66th Electronic Components and Technology Conference
(pp. 2111–2118). https://doi.org/10.1109/ECTC.2016.91
bibtex: '@inproceedings{Eacock_Unger_Eichwald_Grydin_Hengsbach_Althoff_Schaper_Guth_2016,
title={Effect of different oxide layers on the ultrasonic copper wire bond process},
DOI={10.1109/ECTC.2016.91},
booktitle={IEEE 66th Electronic Components and Technology Conference}, author={Eacock,
Florian and Unger, Andreas and Eichwald, Paul and Grydin, Olexandr and Hengsbach,
Florian and Althoff, Simon and Schaper, Mirko and Guth, Karsten}, year={2016},
pages={2111–2118} }'
chicago: Eacock, Florian, Andreas Unger, Paul Eichwald, Olexandr Grydin, Florian
Hengsbach, Simon Althoff, Mirko Schaper, and Karsten Guth. “Effect of Different
Oxide Layers on the Ultrasonic Copper Wire Bond Process.” In IEEE 66th Electronic
Components and Technology Conference, 2111–18, 2016. https://doi.org/10.1109/ECTC.2016.91.
ieee: F. Eacock et al., “Effect of different oxide layers on the ultrasonic
copper wire bond process,” in IEEE 66th Electronic Components and Technology
Conference, 2016, pp. 2111–2118.
mla: Eacock, Florian, et al. “Effect of Different Oxide Layers on the Ultrasonic
Copper Wire Bond Process.” IEEE 66th Electronic Components and Technology Conference,
2016, pp. 2111–18, doi:10.1109/ECTC.2016.91.
short: 'F. Eacock, A. Unger, P. Eichwald, O. Grydin, F. Hengsbach, S. Althoff, M.
Schaper, K. Guth, in: IEEE 66th Electronic Components and Technology Conference,
2016, pp. 2111–2118.'
date_created: 2019-05-27T09:00:50Z
date_updated: 2019-09-16T10:38:59Z
department:
- _id: '151'
doi: 10.1109/ECTC.2016.91
keyword:
- Ultrasonic copper wire bonding
- Al-oxide
- Cuoxide
- oxide-free
- roughness
- morphology
language:
- iso: eng
page: 2111-2118
publication: IEEE 66th Electronic Components and Technology Conference
quality_controlled: '1'
status: public
title: Effect of different oxide layers on the ultrasonic copper wire bond process
type: conference
user_id: '55222'
year: '2016'
...