---
_id: '64884'
abstract:
- lang: eng
text: "To address the challenges associated with poor drug solubility and uncontrolled
drug release in conventional dosage forms, a combination of polymer design and
advanced drug delivery approaches has been employed. The development of pH-responsive
nanoparticles for controlled and selective drug release represents a notable advance
in adaptive nanomedicine. This study explores the design of a pH-responsive polymer,
poly(1,4-phenyleneacetone dimethylene ketal) (PPADK). Additionally, the incorporation
of light-responsive ortho-nitrobenzyl groups (o-NB-PPADK) enhanced the degradation
upon exposure to light. Based on the polymer, nanoparticles were prepared using
the solvent displacement method. The fluorescence dye Lumogen® Red was incorporated
as a model substance. The nanoparticles were characterized by dynamic light scattering
to determine their hydrodynamic diameter and size distribution, and the surface
charge was analyzed. Atomic force microscopy was used to visualize the surface
morphology. The nanoparticles remained stable under physiological pH conditions
while exhibiting accelerated degradation and substance release in acidic environment,
a property potentially exploitable for tumor targeting. Further enhanced degradation
and correspondingly increased release was achieved by incorporating light-responsive
elements in the polymer structure.\r\nThe cytotoxicity of these newly designed
nanoparticles was evaluated in cell culture using a breast cancer cell line. These
results support the potential of o-NB-PPADK nanoparticles as a possible candidate
for selective and effective cancer therapy, combining stimuli-responsive degradation
mechanisms for improved therapeutic outcomes."
article_number: '126127'
article_type: original
author:
- first_name: Maurice
full_name: Kramer, Maurice
last_name: Kramer
- first_name: Matthias
full_name: van der Linde, Matthias
last_name: van der Linde
- first_name: Lisa
full_name: Hönscheid, Lisa
last_name: Hönscheid
- first_name: Corinna
full_name: Horky, Corinna
last_name: Horky
- first_name: Katharina
full_name: Völlmecke, Katharina
last_name: Völlmecke
- first_name: Dennis
full_name: Mulac, Dennis
last_name: Mulac
- first_name: Fabian
full_name: Herrmann, Fabian
last_name: Herrmann
- first_name: Dirk
full_name: Kuckling, Dirk
id: '287'
last_name: Kuckling
- first_name: Klaus
full_name: Langer, Klaus
last_name: Langer
citation:
ama: 'Kramer M, van der Linde M, Hönscheid L, et al. Enlightening release strategies:
Accelerated nanoparticle degradation and substance release utilizing light- and
pH-responsive polymers. International Journal of Pharmaceutics. 2025;684.
doi:10.1016/j.ijpharm.2025.126127'
apa: 'Kramer, M., van der Linde, M., Hönscheid, L., Horky, C., Völlmecke, K., Mulac,
D., Herrmann, F., Kuckling, D., & Langer, K. (2025). Enlightening release
strategies: Accelerated nanoparticle degradation and substance release utilizing
light- and pH-responsive polymers. International Journal of Pharmaceutics,
684, Article 126127. https://doi.org/10.1016/j.ijpharm.2025.126127'
bibtex: '@article{Kramer_van der Linde_Hönscheid_Horky_Völlmecke_Mulac_Herrmann_Kuckling_Langer_2025,
title={Enlightening release strategies: Accelerated nanoparticle degradation and
substance release utilizing light- and pH-responsive polymers}, volume={684},
DOI={10.1016/j.ijpharm.2025.126127},
number={126127}, journal={International Journal of Pharmaceutics}, publisher={Elsevier
BV}, author={Kramer, Maurice and van der Linde, Matthias and Hönscheid, Lisa and
Horky, Corinna and Völlmecke, Katharina and Mulac, Dennis and Herrmann, Fabian
and Kuckling, Dirk and Langer, Klaus}, year={2025} }'
chicago: 'Kramer, Maurice, Matthias van der Linde, Lisa Hönscheid, Corinna Horky,
Katharina Völlmecke, Dennis Mulac, Fabian Herrmann, Dirk Kuckling, and Klaus Langer.
“Enlightening Release Strategies: Accelerated Nanoparticle Degradation and Substance
Release Utilizing Light- and PH-Responsive Polymers.” International Journal
of Pharmaceutics 684 (2025). https://doi.org/10.1016/j.ijpharm.2025.126127.'
ieee: 'M. Kramer et al., “Enlightening release strategies: Accelerated nanoparticle
degradation and substance release utilizing light- and pH-responsive polymers,”
International Journal of Pharmaceutics, vol. 684, Art. no. 126127, 2025,
doi: 10.1016/j.ijpharm.2025.126127.'
mla: 'Kramer, Maurice, et al. “Enlightening Release Strategies: Accelerated Nanoparticle
Degradation and Substance Release Utilizing Light- and PH-Responsive Polymers.”
International Journal of Pharmaceutics, vol. 684, 126127, Elsevier BV,
2025, doi:10.1016/j.ijpharm.2025.126127.'
short: M. Kramer, M. van der Linde, L. Hönscheid, C. Horky, K. Völlmecke, D. Mulac,
F. Herrmann, D. Kuckling, K. Langer, International Journal of Pharmaceutics 684
(2025).
date_created: 2026-03-11T08:46:17Z
date_updated: 2026-03-11T08:52:22Z
department:
- _id: '163'
doi: 10.1016/j.ijpharm.2025.126127
intvolume: ' 684'
keyword:
- Nanoparticles
- Drug delivery
- Controlled release
- Stimuli-responsiveTumor targeting
language:
- iso: eng
main_file_link:
- url: https://www.sciencedirect.com/science/article/pii/S0378517325009640?via%3Dihub
publication: International Journal of Pharmaceutics
publication_identifier:
issn:
- 0378-5173
publication_status: published
publisher: Elsevier BV
status: public
title: 'Enlightening release strategies: Accelerated nanoparticle degradation and
substance release utilizing light- and pH-responsive polymers'
type: journal_article
user_id: '94'
volume: 684
year: '2025'
...
---
_id: '51133'
abstract:
- lang: eng
text: In order to standardize spray flame synthesis (SFS) studies, intensive work
has been done in recent years on the design of burner types. Thus, in 2019, the
so-called SpraySyn1 burner was introduced (SS1), which was subsequently characterized
in numerical and experimental studies. Based on this research, a modification
of the nozzle design was proposed, which has now been considered in the successor
model, SpraySyn2 (SS2). As little is known about the effect of the nozzle adaptation
on the particle formation, we operated both burners under identical operating
conditions to produce maghemite. The final powder comparison showed that SS2 yielded
considerable higher specific surface areas (associated with smaller primary particle
sizes), lower polydispersity, and higher phase purity. To obtain further information
on the size distributions of aggregates and agglomerates generated by SS2, aerosol
samples were extracted by hole in a tube (HIAT) sampling and characterized by
scanning mobility particle sizing (SMPS). Samples were extracted along the centerline
at different heights above the burner (HAB) above the visible flame tip (>7 cm),
and quenching experiments were performed to extract the aerosol samples at different
dilution rates. Thereby, it was demonstrated that performing detailed quenching
experiments is crucial for obtaining representative HIAT-SMPS data. In particular,
agglomerates/aggregate sizes were overestimated by up to ~70 % if samples were
not sufficiently diluted. If sufficient dilution was applied, distribution widths
and mean particle mobility diameters were determined with high accuracy (sample
standard derivation <5 %). Our data suggested the evolution of primary particle
sizes was mostly completed <7 cm HAB and it was shown aggregates/agglomerates
present above the visible flame were compact in structure (non- fractal). The
mean diameter of the particle ensemble grew along the centerline from 6.9 nm (7
cm) to 11.4 nm (15 cm), while distribution widths grew from 1.42 to 1.52.
citation:
ama: Tischendorf R, Massopo O, Schmid H-J, et al., eds. Maghemite Nanoparticles
Synthesis via Spray Flame Synthesis and Particle Characterization by Hole in a
Tube Sampling and Scanning Mobility Particle Sizing (HIAT-SMPS). Elsevier;
2024. doi:https://doi.org/10.1016/j.jaecs.2023.100235
apa: Maghemite nanoparticles synthesis via spray flame synthesis and particle characterization
by hole in a tube sampling and scanning mobility particle sizing (HIAT-SMPS).
(2024). In R. Tischendorf, O. Massopo, H.-J. Schmid, O. Pyrmak, S. Dupont, F.
Fröde, H. Pitsch, & R. Kneer (Eds.), Applications in Energy and Combustion
Science. Elsevier. https://doi.org/10.1016/j.jaecs.2023.100235
bibtex: '@book{Tischendorf_Massopo_Schmid_Pyrmak_Dupont_Fröde_Pitsch_Kneer_2024,
title={Maghemite nanoparticles synthesis via spray flame synthesis and particle
characterization by hole in a tube sampling and scanning mobility particle sizing
(HIAT-SMPS)}, DOI={https://doi.org/10.1016/j.jaecs.2023.100235},
journal={Applications in Energy and Combustion Science}, publisher={Elsevier},
year={2024} }'
chicago: Tischendorf, Ricardo, Orlando Massopo, Hans-Joachim Schmid, Olek Pyrmak,
Sophie Dupont, Fabian Fröde, Heinz Pitsch, and Reinhold Kneer, eds. Maghemite
Nanoparticles Synthesis via Spray Flame Synthesis and Particle Characterization
by Hole in a Tube Sampling and Scanning Mobility Particle Sizing (HIAT-SMPS).
Applications in Energy and Combustion Science. Elsevier, 2024. https://doi.org/10.1016/j.jaecs.2023.100235.
ieee: R. Tischendorf et al., Eds., Maghemite nanoparticles synthesis via
spray flame synthesis and particle characterization by hole in a tube sampling
and scanning mobility particle sizing (HIAT-SMPS). Elsevier, 2024.
mla: Tischendorf, Ricardo, et al., editors. “Maghemite Nanoparticles Synthesis via
Spray Flame Synthesis and Particle Characterization by Hole in a Tube Sampling
and Scanning Mobility Particle Sizing (HIAT-SMPS).” Applications in Energy
and Combustion Science, Elsevier, 2024, doi:https://doi.org/10.1016/j.jaecs.2023.100235.
short: R. Tischendorf, O. Massopo, H.-J. Schmid, O. Pyrmak, S. Dupont, F. Fröde,
H. Pitsch, R. Kneer, eds., Maghemite Nanoparticles Synthesis via Spray Flame Synthesis
and Particle Characterization by Hole in a Tube Sampling and Scanning Mobility
Particle Sizing (HIAT-SMPS), Elsevier, 2024.
date_created: 2024-02-05T12:02:57Z
date_updated: 2024-02-05T12:25:00Z
ddc:
- '660'
department:
- _id: '150'
doi: https://doi.org/10.1016/j.jaecs.2023.100235
editor:
- 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
- first_name: Olek
full_name: Pyrmak, Olek
last_name: Pyrmak
- first_name: Sophie
full_name: Dupont, Sophie
last_name: Dupont
- first_name: Fabian
full_name: Fröde, Fabian
last_name: Fröde
- first_name: Heinz
full_name: Pitsch, Heinz
last_name: Pitsch
- first_name: Reinhold
full_name: Kneer, Reinhold
last_name: Kneer
has_accepted_license: '1'
keyword:
- Flame Spray Pyrolysis
- SpraySyn2
- Spray flame synthesis
- Maghemite nanoparticles
- Gas to particle-conversion
- Hole in a tube sampling
language:
- iso: eng
main_file_link:
- url: https://www.sciencedirect.com/science/article/pii/S2666352X23001243?ref=cra_js_challenge&fr=RR-1
publication: Applications in Energy and Combustion Science
publication_status: published
publisher: Elsevier
status: public
title: Maghemite nanoparticles synthesis via spray flame synthesis and particle characterization
by hole in a tube sampling and scanning mobility particle sizing (HIAT-SMPS)
type: journal_editor
user_id: '98419'
year: '2024'
...
---
_id: '37424'
author:
- first_name: Janis
full_name: Beimdiek, Janis
id: '45788'
last_name: Beimdiek
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
citation:
ama: 'Beimdiek J, Schmid H-J. A combined flue gas cleaning system with a novel entrained
flow SCR using an online synthesized catalyst (Poster). In: ; 2022.'
apa: Beimdiek, J., & Schmid, H.-J. (2022). A combined flue gas cleaning system
with a novel entrained flow SCR using an online synthesized catalyst (Poster).
1st International Workshop on Reacting Particle-Gas Systems, Bochum.
bibtex: '@inproceedings{Beimdiek_Schmid_2022, title={A combined flue gas cleaning
system with a novel entrained flow SCR using an online synthesized catalyst (Poster)},
author={Beimdiek, Janis and Schmid, Hans-Joachim}, year={2022} }'
chicago: Beimdiek, Janis, and Hans-Joachim Schmid. “A Combined Flue Gas Cleaning
System with a Novel Entrained Flow SCR Using an Online Synthesized Catalyst (Poster),”
2022.
ieee: J. Beimdiek and H.-J. Schmid, “A combined flue gas cleaning system with a
novel entrained flow SCR using an online synthesized catalyst (Poster),” presented
at the 1st International Workshop on Reacting Particle-Gas Systems, Bochum, 2022.
mla: Beimdiek, Janis, and Hans-Joachim Schmid. A Combined Flue Gas Cleaning System
with a Novel Entrained Flow SCR Using an Online Synthesized Catalyst (Poster).
2022.
short: 'J. Beimdiek, H.-J. Schmid, in: 2022.'
conference:
end_date: 2022-06-09
location: Bochum
name: 1st International Workshop on Reacting Particle-Gas Systems
start_date: 2022-06-08
date_created: 2023-01-18T14:42:17Z
date_updated: 2023-03-14T08:26:40Z
ddc:
- '660'
department:
- _id: '150'
- _id: '9'
file:
- access_level: closed
content_type: application/pdf
creator: jludwig
date_created: 2023-01-18T14:41:47Z
date_updated: 2023-01-18T14:41:47Z
file_id: '37425'
file_name: Abstract_Particle_Gas.pdf
file_size: 130697
relation: main_file
success: 1
file_date_updated: 2023-01-18T14:41:47Z
has_accepted_license: '1'
keyword:
- clean air
- harmful gas removal
- denitrification
- SCR
- catalytic filtration
- nanoparticles
- flame-synthesis
language:
- iso: eng
status: public
title: A combined flue gas cleaning system with a novel entrained flow SCR using an
online synthesized catalyst (Poster)
type: conference_abstract
user_id: '45788'
year: '2022'
...
---
_id: '37432'
author:
- first_name: Janis
full_name: Beimdiek, Janis
id: '45788'
last_name: Beimdiek
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
citation:
ama: 'Beimdiek J, Schmid H-J. Novel entrained flow SCR using online synthesized
catalyst particles (Poster). In: ; 2022.'
apa: Beimdiek, J., & Schmid, H.-J. (2022). Novel entrained flow SCR using
online synthesized catalyst particles (Poster). 13th World Filtration Congress,
San Diego.
bibtex: '@inproceedings{Beimdiek_Schmid_2022, title={Novel entrained flow SCR using
online synthesized catalyst particles (Poster)}, author={Beimdiek, Janis and Schmid,
Hans-Joachim}, year={2022} }'
chicago: Beimdiek, Janis, and Hans-Joachim Schmid. “Novel Entrained Flow SCR Using
Online Synthesized Catalyst Particles (Poster),” 2022.
ieee: J. Beimdiek and H.-J. Schmid, “Novel entrained flow SCR using online synthesized
catalyst particles (Poster),” presented at the 13th World Filtration Congress,
San Diego, 2022.
mla: Beimdiek, Janis, and Hans-Joachim Schmid. Novel Entrained Flow SCR Using
Online Synthesized Catalyst Particles (Poster). 2022.
short: 'J. Beimdiek, H.-J. Schmid, in: 2022.'
conference:
end_date: 2022-10-09
location: San Diego
name: 13th World Filtration Congress
start_date: 2022-10-05
date_created: 2023-01-18T15:10:06Z
date_updated: 2023-03-14T08:28:49Z
ddc:
- '660'
department:
- _id: '150'
- _id: '9'
file:
- access_level: closed
content_type: application/pdf
creator: jludwig
date_created: 2023-02-01T09:25:32Z
date_updated: 2023-02-01T09:25:32Z
file_id: '41352'
file_name: Abstract_Poster_WFC2022.pdf
file_size: 98157
relation: main_file
success: 1
file_date_updated: 2023-02-01T09:25:32Z
has_accepted_license: '1'
keyword:
- clean air
- harmful gas removal
- denitrification
- SCR
- catalytic filtration
- nanoparticles
- flame-synthesis
language:
- iso: eng
status: public
title: Novel entrained flow SCR using online synthesized catalyst particles (Poster)
type: conference_abstract
user_id: '45788'
year: '2022'
...
---
_id: '59620'
article_type: original
author:
- first_name: Tarik
full_name: Rust, Tarik
last_name: Rust
- first_name: Dimitri
full_name: Jung, Dimitri
last_name: Jung
- first_name: Axel
full_name: Hoppe, Axel
id: '62844'
last_name: Hoppe
- first_name: Timo
full_name: Schoppa, Timo
last_name: Schoppa
- first_name: Klaus
full_name: Langer, Klaus
last_name: Langer
- first_name: Dirk
full_name: Kuckling, Dirk
id: '287'
last_name: Kuckling
citation:
ama: Rust T, Jung D, Hoppe A, Schoppa T, Langer K, Kuckling D. Backbone-Degradable
(Co-)Polymers for Light-Triggered Drug Delivery. ACS Applied Polymer Materials.
2021;3(8):3831-3842. doi:10.1021/acsapm.1c00411
apa: Rust, T., Jung, D., Hoppe, A., Schoppa, T., Langer, K., & Kuckling, D.
(2021). Backbone-Degradable (Co-)Polymers for Light-Triggered Drug Delivery. ACS
Applied Polymer Materials, 3(8), 3831–3842. https://doi.org/10.1021/acsapm.1c00411
bibtex: '@article{Rust_Jung_Hoppe_Schoppa_Langer_Kuckling_2021, title={Backbone-Degradable
(Co-)Polymers for Light-Triggered Drug Delivery}, volume={3}, DOI={10.1021/acsapm.1c00411},
number={8}, journal={ACS Applied Polymer Materials}, publisher={American Chemical
Society (ACS)}, author={Rust, Tarik and Jung, Dimitri and Hoppe, Axel and Schoppa,
Timo and Langer, Klaus and Kuckling, Dirk}, year={2021}, pages={3831–3842} }'
chicago: 'Rust, Tarik, Dimitri Jung, Axel Hoppe, Timo Schoppa, Klaus Langer, and
Dirk Kuckling. “Backbone-Degradable (Co-)Polymers for Light-Triggered Drug Delivery.”
ACS Applied Polymer Materials 3, no. 8 (2021): 3831–42. https://doi.org/10.1021/acsapm.1c00411.'
ieee: 'T. Rust, D. Jung, A. Hoppe, T. Schoppa, K. Langer, and D. Kuckling, “Backbone-Degradable
(Co-)Polymers for Light-Triggered Drug Delivery,” ACS Applied Polymer Materials,
vol. 3, no. 8, pp. 3831–3842, 2021, doi: 10.1021/acsapm.1c00411.'
mla: Rust, Tarik, et al. “Backbone-Degradable (Co-)Polymers for Light-Triggered
Drug Delivery.” ACS Applied Polymer Materials, vol. 3, no. 8, American
Chemical Society (ACS), 2021, pp. 3831–42, doi:10.1021/acsapm.1c00411.
short: T. Rust, D. Jung, A. Hoppe, T. Schoppa, K. Langer, D. Kuckling, ACS Applied
Polymer Materials 3 (2021) 3831–3842.
date_created: 2025-04-22T06:02:11Z
date_updated: 2025-04-22T06:12:02Z
department:
- _id: '311'
doi: 10.1021/acsapm.1c00411
intvolume: ' 3'
issue: '8'
keyword:
- backbone-degradable
- light-responsive
- redox-responsive
- drug delivery
- nanoparticles
language:
- iso: eng
main_file_link:
- url: https://pubs.acs.org/doi/10.1021/acsapm.1c00411?ref=PDF
page: 3831-3842
publication: ACS Applied Polymer Materials
publication_identifier:
issn:
- 2637-6105
- 2637-6105
publication_status: published
publisher: American Chemical Society (ACS)
quality_controlled: '1'
status: public
title: Backbone-Degradable (Co-)Polymers for Light-Triggered Drug Delivery
type: journal_article
user_id: '62844'
volume: 3
year: '2021'
...
---
_id: '62806'
abstract:
- lang: eng
text: The electrical double‐layer plays a key role in important interfacial electrochemical
processes from catalysis to energy storage and corrosion. Therefore, understanding
its structure is crucial for the progress of sustainable technologies. We extract
new physico‐chemical information on the capacitance and structure of the electrical
double‐layer of platinum and gold nanoparticles at the molecular level, employing
single nanoparticle electrochemistry. The charge storage ability of the solid/liquid
interface is larger by one order‐of‐magnitude than predicted by the traditional
mean‐field models of the double‐layer such as the Gouy–Chapman–Stern model. Performing
molecular dynamics simulations, we investigate the possible relationship between
the measured high capacitance and adsorption strength of the water adlayer formed
at the metal surface. These insights may launch the active tuning of solid–solvent
and solvent–solvent interactions as an innovative design strategy to transform
energy technologies towards superior performance and sustainability.
article_number: e202112679
article_type: original
author:
- first_name: Mahnaz
full_name: Azimzadeh Sani, Mahnaz
last_name: Azimzadeh Sani
- first_name: Nicholas G.
full_name: Pavlopoulos, Nicholas G.
last_name: Pavlopoulos
- first_name: Simone
full_name: Pezzotti, Simone
last_name: Pezzotti
- first_name: Alessandra
full_name: Serva, Alessandra
last_name: Serva
- first_name: Paolo
full_name: Cignoni, Paolo
last_name: Cignoni
- first_name: Julia
full_name: Linnemann, Julia
id: '116779'
last_name: Linnemann
orcid: 0000-0001-6883-5424
- first_name: Mathieu
full_name: Salanne, Mathieu
last_name: Salanne
- first_name: Marie‐Pierre
full_name: Gaigeot, Marie‐Pierre
last_name: Gaigeot
- first_name: Kristina
full_name: Tschulik, Kristina
last_name: Tschulik
citation:
ama: 'Azimzadeh Sani M, Pavlopoulos NG, Pezzotti S, et al. Unexpectedly High Capacitance
of the Metal Nanoparticle/Water Interface: Molecular‐Level Insights into the Electrical
Double Layer. Angewandte Chemie International Edition. 2021;61(5). doi:10.1002/anie.202112679'
apa: 'Azimzadeh Sani, M., Pavlopoulos, N. G., Pezzotti, S., Serva, A., Cignoni,
P., Linnemann, J., Salanne, M., Gaigeot, M., & Tschulik, K. (2021). Unexpectedly
High Capacitance of the Metal Nanoparticle/Water Interface: Molecular‐Level Insights
into the Electrical Double Layer. Angewandte Chemie International Edition,
61(5), Article e202112679. https://doi.org/10.1002/anie.202112679'
bibtex: '@article{Azimzadeh Sani_Pavlopoulos_Pezzotti_Serva_Cignoni_Linnemann_Salanne_Gaigeot_Tschulik_2021,
title={Unexpectedly High Capacitance of the Metal Nanoparticle/Water Interface:
Molecular‐Level Insights into the Electrical Double Layer}, volume={61}, DOI={10.1002/anie.202112679}, number={5e202112679},
journal={Angewandte Chemie International Edition}, publisher={Wiley}, author={Azimzadeh
Sani, Mahnaz and Pavlopoulos, Nicholas G. and Pezzotti, Simone and Serva, Alessandra
and Cignoni, Paolo and Linnemann, Julia and Salanne, Mathieu and Gaigeot, Marie‐Pierre
and Tschulik, Kristina}, year={2021} }'
chicago: 'Azimzadeh Sani, Mahnaz, Nicholas G. Pavlopoulos, Simone Pezzotti, Alessandra
Serva, Paolo Cignoni, Julia Linnemann, Mathieu Salanne, Marie‐Pierre Gaigeot,
and Kristina Tschulik. “Unexpectedly High Capacitance of the Metal Nanoparticle/Water
Interface: Molecular‐Level Insights into the Electrical Double Layer.” Angewandte
Chemie International Edition 61, no. 5 (2021). https://doi.org/10.1002/anie.202112679.'
ieee: 'M. Azimzadeh Sani et al., “Unexpectedly High Capacitance of the Metal
Nanoparticle/Water Interface: Molecular‐Level Insights into the Electrical Double
Layer,” Angewandte Chemie International Edition, vol. 61, no. 5, Art. no.
e202112679, 2021, doi: 10.1002/anie.202112679.'
mla: 'Azimzadeh Sani, Mahnaz, et al. “Unexpectedly High Capacitance of the Metal
Nanoparticle/Water Interface: Molecular‐Level Insights into the Electrical Double
Layer.” Angewandte Chemie International Edition, vol. 61, no. 5, e202112679,
Wiley, 2021, doi:10.1002/anie.202112679.'
short: M. Azimzadeh Sani, N.G. Pavlopoulos, S. Pezzotti, A. Serva, P. Cignoni, J.
Linnemann, M. Salanne, M. Gaigeot, K. Tschulik, Angewandte Chemie International
Edition 61 (2021).
date_created: 2025-12-03T15:39:25Z
date_updated: 2025-12-03T16:31:54Z
department:
- _id: '985'
doi: 10.1002/anie.202112679
extern: '1'
intvolume: ' 61'
issue: '5'
keyword:
- single-entity electrochemistry
- electrical double layer
- supercapacitor
- nanoparticles
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
publication: Angewandte Chemie International Edition
publication_identifier:
issn:
- 1433-7851
- 1521-3773
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: 'Unexpectedly High Capacitance of the Metal Nanoparticle/Water Interface: Molecular‐Level
Insights into the Electrical Double Layer'
type: journal_article
user_id: '116779'
volume: 61
year: '2021'
...
---
_id: '64018'
abstract:
- lang: eng
text: CO oxidation is an extensively studied reaction in heterogeneous catalysis
due to its seeming simplicity and its great importance for emission control. However,
the role of particle size and more specifically structure sensitivity in this
reaction is still controversial. In the present study, colloidal “surfactant-free”
Pt nanoparticles (NPs) in a size regime of 1–4 nm with narrow size distribution
and control over particle size were synthesized and subsequently supported on
Al2O3 to prepare model catalysts. CO oxidation was performed using Pt NPs catalysts
with particles sizes of 1, 2, 3, and 4 nm at different reaction temperatures.
It is shown that the reaction exhibits a particle size effect that depends strongly
on the reaction conditions. At 170 °C, the reaction seems to proceed within the
same kinetic regime for all particle sizes, but the surface normalized activity
depends strongly on the particle size, with maximum activity for nanoparticles
2 nm in diameter. A temperature increase to 200 °C leads to a change of the kinetic
regime that depends on the particle size. For Pt NPs 1 nm in diameter a reaction
order of 1 for O2 was observed, indicating that O2 adsorbs molecularly and dissociates
in a following step, which represents the generally accepted mechanism on Pt surfaces.
The reaction order of −1 for CO demonstrates that the surface is saturated with
CO under reaction conditions. With increasing particle size, the reaction orders
of O2 and CO change. For particles 2 nm in size, an increase in temperature also
results in reaction orders of 1 for O2 and −1 for CO; NPs of 3 and 4 nm, even
at higher temperatures, show no clear kinetic behavior that can be explained by
a single reaction mechanism. Instead, the Boudouard reaction between two adjacent
adsorbed CO molecules was identified as an important additional reaction pathway
that occurs preferentially on large particles and causes more complex kinetics.
author:
- first_name: Sarah
full_name: Neumann, Sarah
last_name: Neumann
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Gerd
full_name: Buntkowsky, Gerd
last_name: Buntkowsky
- first_name: Stephen
full_name: Paul, Stephen
last_name: Paul
- first_name: Greg
full_name: Thiele, Greg
last_name: Thiele
- first_name: Heiko
full_name: Sievers, Heiko
last_name: Sievers
- first_name: Marcus
full_name: Bäumer, Marcus
last_name: Bäumer
- first_name: Sebastian
full_name: Kunz, Sebastian
last_name: Kunz
citation:
ama: Neumann S, Gutmann T, Buntkowsky G, et al. Insights into the reaction mechanism
and particle size effects of CO oxidation over supported Pt nanoparticle catalysts.
Journal of Catalysis. 2019;377:662–672. doi:10.1016/j.jcat.2019.07.049
apa: Neumann, S., Gutmann, T., Buntkowsky, G., Paul, S., Thiele, G., Sievers, H.,
Bäumer, M., & Kunz, S. (2019). Insights into the reaction mechanism and particle
size effects of CO oxidation over supported Pt nanoparticle catalysts. Journal
of Catalysis, 377, 662–672. https://doi.org/10.1016/j.jcat.2019.07.049
bibtex: '@article{Neumann_Gutmann_Buntkowsky_Paul_Thiele_Sievers_Bäumer_Kunz_2019,
title={Insights into the reaction mechanism and particle size effects of CO oxidation
over supported Pt nanoparticle catalysts}, volume={377}, DOI={10.1016/j.jcat.2019.07.049},
journal={Journal of Catalysis}, author={Neumann, Sarah and Gutmann, Torsten and
Buntkowsky, Gerd and Paul, Stephen and Thiele, Greg and Sievers, Heiko and Bäumer,
Marcus and Kunz, Sebastian}, year={2019}, pages={662–672} }'
chicago: 'Neumann, Sarah, Torsten Gutmann, Gerd Buntkowsky, Stephen Paul, Greg Thiele,
Heiko Sievers, Marcus Bäumer, and Sebastian Kunz. “Insights into the Reaction
Mechanism and Particle Size Effects of CO Oxidation over Supported Pt Nanoparticle
Catalysts.” Journal of Catalysis 377 (2019): 662–672. https://doi.org/10.1016/j.jcat.2019.07.049.'
ieee: 'S. Neumann et al., “Insights into the reaction mechanism and particle
size effects of CO oxidation over supported Pt nanoparticle catalysts,” Journal
of Catalysis, vol. 377, pp. 662–672, 2019, doi: 10.1016/j.jcat.2019.07.049.'
mla: Neumann, Sarah, et al. “Insights into the Reaction Mechanism and Particle Size
Effects of CO Oxidation over Supported Pt Nanoparticle Catalysts.” Journal
of Catalysis, vol. 377, 2019, pp. 662–672, doi:10.1016/j.jcat.2019.07.049.
short: S. Neumann, T. Gutmann, G. Buntkowsky, S. Paul, G. Thiele, H. Sievers, M.
Bäumer, S. Kunz, Journal of Catalysis 377 (2019) 662–672.
date_created: 2026-02-07T16:02:06Z
date_updated: 2026-02-17T16:14:45Z
doi: 10.1016/j.jcat.2019.07.049
extern: '1'
intvolume: ' 377'
keyword:
- Solid state NMR
- “Surfactant-free” platinum nanoparticles
- CO oxidation
- Particle size effect
- Structure sensitivity
language:
- iso: eng
page: 662–672
publication: Journal of Catalysis
status: public
title: Insights into the reaction mechanism and particle size effects of CO oxidation
over supported Pt nanoparticle catalysts
type: journal_article
user_id: '100715'
volume: 377
year: '2019'
...
---
_id: '63991'
abstract:
- lang: eng
text: A series of 1 and 2 nm sized platinum nanoparticles (Pt-NPs) deposited on
different support materials, namely, gamma-alumina (gamma-Al2O3), titanium dioxide
(TiO2), silicon dioxide (SiO2) and fumed silica are investigated by solid-state
NMR and dynamic nuclear polarization enhanced NMR spectroscopy (DNP). DNP signal
enhancement factors up to 170 enable gaining deeper insight into the surface chemistry
of Pt-NPs. Carbon monoxide is used as a probe molecule to analyze the adsorption
process and the surface chemistry on the supported Pt-NPs. The studied systems
show significant catalytic activity in carbon monoxide oxidation on their surface
at room temperature. The underlying catalytic mechanism is the water-gas shift
reaction. In the case of alumina as the support the produced CO2 reacts with the
surface to form carbonate, which is revealed by solid-state NMR. A similar carbonate
formation is also observed when physical mixtures of neat alumina with silica,
fumed silica and titania supported Pt-NPs are studied.
author:
- first_name: V.
full_name: Klimavicius, V.
last_name: Klimavicius
- first_name: S.
full_name: Neumann, S.
last_name: Neumann
- first_name: S.
full_name: Kunz, S.
last_name: Kunz
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: G.
full_name: Buntkowsky, G.
last_name: Buntkowsky
citation:
ama: Klimavicius V, Neumann S, Kunz S, Gutmann T, Buntkowsky G. Room temperature
CO oxidation catalysed by supported Pt nanoparticles revealed by solid-state NMR
and DNP spectroscopy. Catalysis Science & Technology. 2019;9(14):3743–3752.
doi:10.1039/c9cy00684b
apa: Klimavicius, V., Neumann, S., Kunz, S., Gutmann, T., & Buntkowsky, G. (2019).
Room temperature CO oxidation catalysed by supported Pt nanoparticles revealed
by solid-state NMR and DNP spectroscopy. Catalysis Science & Technology,
9(14), 3743–3752. https://doi.org/10.1039/c9cy00684b
bibtex: '@article{Klimavicius_Neumann_Kunz_Gutmann_Buntkowsky_2019, title={Room
temperature CO oxidation catalysed by supported Pt nanoparticles revealed by solid-state
NMR and DNP spectroscopy}, volume={9}, DOI={10.1039/c9cy00684b},
number={14}, journal={Catalysis Science & Technology}, author={Klimavicius,
V. and Neumann, S. and Kunz, S. and Gutmann, Torsten and Buntkowsky, G.}, year={2019},
pages={3743–3752} }'
chicago: 'Klimavicius, V., S. Neumann, S. Kunz, Torsten Gutmann, and G. Buntkowsky.
“Room Temperature CO Oxidation Catalysed by Supported Pt Nanoparticles Revealed
by Solid-State NMR and DNP Spectroscopy.” Catalysis Science & Technology
9, no. 14 (2019): 3743–3752. https://doi.org/10.1039/c9cy00684b.'
ieee: 'V. Klimavicius, S. Neumann, S. Kunz, T. Gutmann, and G. Buntkowsky, “Room
temperature CO oxidation catalysed by supported Pt nanoparticles revealed by solid-state
NMR and DNP spectroscopy,” Catalysis Science & Technology, vol. 9,
no. 14, pp. 3743–3752, 2019, doi: 10.1039/c9cy00684b.'
mla: Klimavicius, V., et al. “Room Temperature CO Oxidation Catalysed by Supported
Pt Nanoparticles Revealed by Solid-State NMR and DNP Spectroscopy.” Catalysis
Science & Technology, vol. 9, no. 14, 2019, pp. 3743–3752, doi:10.1039/c9cy00684b.
short: V. Klimavicius, S. Neumann, S. Kunz, T. Gutmann, G. Buntkowsky, Catalysis
Science & Technology 9 (2019) 3743–3752.
date_created: 2026-02-07T15:47:21Z
date_updated: 2026-02-17T16:16:33Z
doi: 10.1039/c9cy00684b
extern: '1'
intvolume: ' 9'
issue: '14'
keyword:
- Chemistry
- gamma-alumina
- hydrogenation
- silica
- c-13
- interactions
- metal-catalysts
- particle-size
- platinum nanoparticles
- sites
- surface
- water-gas shift
language:
- iso: eng
page: 3743–3752
publication: Catalysis Science & Technology
publication_identifier:
issn:
- 2044-4753
status: public
title: Room temperature CO oxidation catalysed by supported Pt nanoparticles revealed
by solid-state NMR and DNP spectroscopy
type: journal_article
user_id: '100715'
volume: 9
year: '2019'
...
---
_id: '64053'
abstract:
- lang: eng
text: The utilization and preparation of functional hybrid films for optical sensing
applications and membranes is of utmost importance. In this work, we report the
convenient and scalable preparation of self-crosslinking particle-based films
derived by directed self-assembly of alkoxysilane-based cross-linkers as part
of a core-shell particle architecture. The synthesis of well-designed monodisperse
core-shell particles by emulsion polymerization is the basic prerequisite for
subsequent particle processing via the melt-shear organization technique. In more
detail, the core particles consist of polystyrene (PS) or poly(methyl methacrylate)
(PMMA), while the comparably soft particle shell consists of poly(ethyl acrylate)
(PEA) and different alkoxysilane-based poly(methacrylate)s. For hybrid film formation
and convenient self-cross-linking, different alkyl groups at the siloxane moieties
were investigated in detail by solid-state Magic-Angle Spinning Nuclear Magnetic
Resonance (MAS, NMR) spectroscopy revealing different crosslinking capabilities,
which strongly influence the properties of the core or shell particle films with
respect to transparency and iridescent reflection colors. Furthermore, solid-state
NMR spectroscopy and investigation of the thermal properties by differential scanning
calorimetry (DSC) measurements allow for insights into the cross-linking capabilities
prior to and after synthesis, as well as after the thermally and pressure-induced
processing steps. Subsequently, free-standing and self-crosslinked particle-based
films featuring excellent particle order are obtained by application of the melt-shear
organization technique, as shown by microscopy (TEM, SEM).
author:
- first_name: S.
full_name: Vowinkel, S.
last_name: Vowinkel
- first_name: S.
full_name: Paul, S.
last_name: Paul
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: M.
full_name: Gallei, M.
last_name: Gallei
citation:
ama: Vowinkel S, Paul S, Gutmann T, Gallei M. Free-Standing and Self-Crosslinkable
Hybrid Films by Core-Shell Particle Design and Processing. Nanomaterials.
2017;7(11):390. doi:10.3390/nano7110390
apa: Vowinkel, S., Paul, S., Gutmann, T., & Gallei, M. (2017). Free-Standing
and Self-Crosslinkable Hybrid Films by Core-Shell Particle Design and Processing.
Nanomaterials, 7(11), 390. https://doi.org/10.3390/nano7110390
bibtex: '@article{Vowinkel_Paul_Gutmann_Gallei_2017, title={Free-Standing and Self-Crosslinkable
Hybrid Films by Core-Shell Particle Design and Processing}, volume={7}, DOI={10.3390/nano7110390}, number={11},
journal={Nanomaterials}, author={Vowinkel, S. and Paul, S. and Gutmann, Torsten
and Gallei, M.}, year={2017}, pages={390} }'
chicago: 'Vowinkel, S., S. Paul, Torsten Gutmann, and M. Gallei. “Free-Standing
and Self-Crosslinkable Hybrid Films by Core-Shell Particle Design and Processing.”
Nanomaterials 7, no. 11 (2017): 390. https://doi.org/10.3390/nano7110390.'
ieee: 'S. Vowinkel, S. Paul, T. Gutmann, and M. Gallei, “Free-Standing and Self-Crosslinkable
Hybrid Films by Core-Shell Particle Design and Processing,” Nanomaterials,
vol. 7, no. 11, p. 390, 2017, doi: 10.3390/nano7110390.'
mla: Vowinkel, S., et al. “Free-Standing and Self-Crosslinkable Hybrid Films by
Core-Shell Particle Design and Processing.” Nanomaterials, vol. 7, no.
11, 2017, p. 390, doi:10.3390/nano7110390.
short: S. Vowinkel, S. Paul, T. Gutmann, M. Gallei, Nanomaterials 7 (2017) 390.
date_created: 2026-02-07T16:15:23Z
date_updated: 2026-02-17T16:12:54Z
doi: 10.3390/nano7110390
extern: '1'
intvolume: ' 7'
issue: '11'
keyword:
- Materials Science
- Science & Technology - Other Topics
- solid-state nmr
- spectroscopy
- catalysts
- colloidal crystals
- colloids
- cross-linking
- elastomeric opal films
- emulsion polymerization
- gamma-methacryloxypropyltrimethoxysilane
- hybrid films
- melt-shear organization
- nanoparticles
- particle
- photons
- polymers
- processing
- self-assembly
- transition
language:
- iso: eng
page: '390'
publication: Nanomaterials
publication_identifier:
issn:
- 2079-4991
status: public
title: Free-Standing and Self-Crosslinkable Hybrid Films by Core-Shell Particle Design
and Processing
type: journal_article
user_id: '100715'
volume: 7
year: '2017'
...
---
_id: '64057'
abstract:
- lang: eng
text: Self-assembly of nanoparticles (NPs) forming unique structures has been investigated
extensively over the past few years. However, many self-assembled structures by
NPs are irreversible, because they are generally constructed using their suspensions.
It is still challenging for NPs to reversibly self-assemble in dry state, let
alone of polymeric NPs with general sizes of hundreds of nm. Herein, this study
reports a new reversible self-assembly phenomenon of NPs in dry state, forming
thermoreversible strip-like supermolecular structures. These novel NPs of around
150 nm are perfluorinated surface-undecenoated cellulose nanoparticles (FSU-CNPs)
with a core-coronas structure. The thermoreversible self-assembled structure is
formed after drying in the air at the interface between FSU-CNP films and Teflon
substrates. Remarkably, the formation and dissociation of this assembled structure
are accompanied by a reversible conversion of the surface hydrophobicity, film
transparency, and anisotropic properties. These findings show novel feasibility
of reversible self-assembly of NPs in dry state, and thereby expand our knowledge
of self-assembly phenomenon.
author:
- first_name: Yonggui
full_name: Wang, Yonggui
last_name: Wang
- first_name: Pedro B.
full_name: Groszewicz, Pedro B.
last_name: Groszewicz
- first_name: Sabine
full_name: Rosenfeldt, Sabine
last_name: Rosenfeldt
- first_name: Hendrik
full_name: Schmidt, Hendrik
last_name: Schmidt
- first_name: Cynthia A.
full_name: Volkert, Cynthia A.
last_name: Volkert
- first_name: Philipp
full_name: Vana, Philipp
last_name: Vana
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Gerd
full_name: Buntkowsky, Gerd
last_name: Buntkowsky
- first_name: Kai
full_name: Zhang, Kai
last_name: Zhang
citation:
ama: Wang Y, Groszewicz PB, Rosenfeldt S, et al. Thermoreversible Self-Assembly
of Perfluorinated Core-Coronas Cellulose-Nanoparticles in Dry State. Advanced
Materials. Published online 2017:1702473. doi:10.1002/adma.201702473
apa: Wang, Y., Groszewicz, P. B., Rosenfeldt, S., Schmidt, H., Volkert, C. A., Vana,
P., Gutmann, T., Buntkowsky, G., & Zhang, K. (2017). Thermoreversible Self-Assembly
of Perfluorinated Core-Coronas Cellulose-Nanoparticles in Dry State. Advanced
Materials, 1702473. https://doi.org/10.1002/adma.201702473
bibtex: '@article{Wang_Groszewicz_Rosenfeldt_Schmidt_Volkert_Vana_Gutmann_Buntkowsky_Zhang_2017,
title={Thermoreversible Self-Assembly of Perfluorinated Core-Coronas Cellulose-Nanoparticles
in Dry State}, DOI={10.1002/adma.201702473},
journal={Advanced Materials}, author={Wang, Yonggui and Groszewicz, Pedro B. and
Rosenfeldt, Sabine and Schmidt, Hendrik and Volkert, Cynthia A. and Vana, Philipp
and Gutmann, Torsten and Buntkowsky, Gerd and Zhang, Kai}, year={2017}, pages={1702473}
}'
chicago: Wang, Yonggui, Pedro B. Groszewicz, Sabine Rosenfeldt, Hendrik Schmidt,
Cynthia A. Volkert, Philipp Vana, Torsten Gutmann, Gerd Buntkowsky, and Kai Zhang.
“Thermoreversible Self-Assembly of Perfluorinated Core-Coronas Cellulose-Nanoparticles
in Dry State.” Advanced Materials, 2017, 1702473. https://doi.org/10.1002/adma.201702473.
ieee: 'Y. Wang et al., “Thermoreversible Self-Assembly of Perfluorinated
Core-Coronas Cellulose-Nanoparticles in Dry State,” Advanced Materials,
p. 1702473, 2017, doi: 10.1002/adma.201702473.'
mla: Wang, Yonggui, et al. “Thermoreversible Self-Assembly of Perfluorinated Core-Coronas
Cellulose-Nanoparticles in Dry State.” Advanced Materials, 2017, p. 1702473,
doi:10.1002/adma.201702473.
short: Y. Wang, P.B. Groszewicz, S. Rosenfeldt, H. Schmidt, C.A. Volkert, P. Vana,
T. Gutmann, G. Buntkowsky, K. Zhang, Advanced Materials (2017) 1702473.
date_created: 2026-02-07T16:16:37Z
date_updated: 2026-02-17T16:12:48Z
doi: 10.1002/adma.201702473
extern: '1'
keyword:
- nanoparticles
- self-assembly
- cellulose
- core-coronas structure
- thermoreversible
language:
- iso: eng
page: '1702473'
publication: Advanced Materials
status: public
title: Thermoreversible Self-Assembly of Perfluorinated Core-Coronas Cellulose-Nanoparticles
in Dry State
type: journal_article
user_id: '100715'
year: '2017'
...