@article{41509, author = {{Krüger, Jan Tobias and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0167-577X}}, journal = {{Materials Letters}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}}, publisher = {{Elsevier BV}}, title = {{{Bioresorbable AgCe and AgCeLa alloys for adapted Fe-based implants}}}, doi = {{10.1016/j.matlet.2021.130890}}, volume = {{306}}, year = {{2021}}, } @article{41517, abstract = {{AbstractWithin this research, the multiscale microstructural evolution before and after the tensile test of a FeCo alloy is addressed. X-ray µ-computer tomography (CT), electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM) are employed to determine the microstructure on different length scales. Microstructural evolution is studied by performing EBSD of the same area before and after the tensile test. As a result, $$\langle$$ ⟨ 001$$\rangle$$ ⟩ ||TD, $$\langle$$ ⟨ 011$$\rangle$$ ⟩ ||TD are hard orientations and $$\langle$$ ⟨ 111$$\rangle$$ ⟩ ||TD is soft orientations for deformation accommodation. It is not possible to predict the deformation of a single grain with the Taylor model. However, the Taylor model accurately predicts the orientation of all grains after deformation. {123}$$\langle$$ ⟨ 111$$\rangle$$ ⟩ is the most active slip system, and {112}$$\langle$$ ⟨ 111$$\rangle$$ ⟩ is the least active slip system. Both EBSD micrographs show grain subdivision after tensile testing. TEM images show the formation of dislocation cells. Correlative HRTEM images show unresolved lattice fringes at dislocation cell boundaries, whereas resolved lattice fringes are observed at dislocation cell interior. Since Schmid’s law is unable to predict the deformation behavior of grains, the boundary slip transmission accurately predicts the grain deformation behavior.}}, author = {{Pramanik, Sudipta and Tasche, Lennart and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{1059-9495}}, journal = {{Journal of Materials Engineering and Performance}}, keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}}, number = {{11}}, pages = {{8048--8056}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Correlation between Taylor Model Prediction and Transmission Electron Microscopy-Based Microstructural Investigations of Quasi-In Situ Tensile Deformation of Additively Manufactured FeCo Alloy}}}, doi = {{10.1007/s11665-021-06065-9}}, volume = {{30}}, year = {{2021}}, } @article{29815, abstract = {{Aluminium steel clad materials have high potential for industrial applications. Their mechanical properties are governed by an intermetallic layer, which forms upon heat treatment at the Al-Fe interface. Transmission electron microscopy was employed to identify the phases present at the interface by selective area electron diffraction and energy dispersive spectroscopy. Three phases were identified: orthorhombic Al5Fe2, monoclinic Al13Fe4 and cubic Al19Fe4MnSi2. An effective interdiffusion coefficient dependent on concentration was determined according to the Boltzmann–Matano method. The highest value of the interdiffusion coefficient was reached at the composition of the intermetallic phases. Afterwards, the process of diffusion considering the evaluated interdiffusion coefficient was simulated using the finite element method. Results of the simulations revealed that growth of the intermetallic phases proceeds preferentially in the direction of aluminium.}}, author = {{Křivská, Barbora and Šlapáková, Michaela and Veselý, Jozef and Kihoulou, Martin and Fekete, Klaudia and Minárik, Peter and Králík, Rostislav and Grydin, Olexandr and Stolbchenko, Mykhailo and Schaper, Mirko}}, issn = {{1996-1944}}, journal = {{Materials}}, keywords = {{General Materials Science}}, number = {{24}}, publisher = {{MDPI AG}}, title = {{{Intermetallic Phases Identification and Diffusion Simulation in Twin-Roll Cast Al-Fe Clad Sheet}}}, doi = {{10.3390/ma14247771}}, volume = {{14}}, year = {{2021}}, } @article{41515, author = {{Pramanik, Sudipta and Tasche, Lennart and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{2214-8604}}, journal = {{Additive Manufacturing}}, keywords = {{Industrial and Manufacturing Engineering, Engineering (miscellaneous), General Materials Science, Biomedical Engineering}}, publisher = {{Elsevier BV}}, title = {{{Investigating the microstructure of an additively manufactured FeCo alloy: an electron microscopy study}}}, doi = {{10.1016/j.addma.2021.102087}}, volume = {{46}}, year = {{2021}}, } @article{30372, author = {{Zahera, H.M.A and Jalota, Rricha and Sherif, Mohamed Ahmed and Ngomo, Axel-Cyrille Ngonga}}, issn = {{2169-3536}}, journal = {{IEEE Access}}, keywords = {{General Engineering, General Materials Science, General Computer Science}}, pages = {{118861--118870}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{I-AID: Identifying Actionable Information From Disaster-Related Tweets}}}, doi = {{10.1109/access.2021.3107812}}, volume = {{9}}, year = {{2021}}, } @article{46007, author = {{Zhai, Qingfeng and Pan, Ying and Dai, Liming}}, issn = {{2643-6728}}, journal = {{Accounts of Materials Research}}, keywords = {{Materials Chemistry, Polymers and Plastics, Materials Science (miscellaneous), Chemical Engineering (miscellaneous)}}, number = {{12}}, pages = {{1239--1250}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Carbon-Based Metal-Free Electrocatalysts: Past, Present, and Future}}}, doi = {{10.1021/accountsmr.1c00190}}, volume = {{2}}, year = {{2021}}, } @article{46017, author = {{Zhang, Dawei and Luo, Zheng-Dong and Yao, Yin and Schoenherr, Peggy and Sha, Chuhan and Pan, Ying and Sharma, Pankaj and Alexe, Marin and Seidel, Jan}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, keywords = {{Mechanical Engineering, Condensed Matter Physics, General Materials Science, General Chemistry, Bioengineering}}, number = {{2}}, pages = {{995--1002}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Anisotropic Ion Migration and Electronic Conduction in van der Waals Ferroelectric CuInP2S6}}}, doi = {{10.1021/acs.nanolett.0c04023}}, volume = {{21}}, year = {{2021}}, } @article{51202, abstract = {{When joining lightweight parts of various materials, clinching is a cost efficient solution. In a production line, the quality of a clinch point is primarily controlled by measurement of dimensions, which are accessible from outside. However, methods such as visual testing and measuring the bottom thickness as well as the outer diameter are not able to deliver any information about the most significant geometrical characteristic of the clinch point, neck thickness and undercut. Furthermore, ex-situ destructive methods such as microsectioning cannot detect elastic deformations and cracks that close after unloading. In order to exceed the current limits, a new non-destructive in-situ testing method for the clinching process is necessary. This work proposes a concept to characterize clinch points in-situ by combining two complementary non-destructive methods, namely, computed tomography (CT) and ultrasonic testing. Firstly, clinch points with different geometrical characteristics are analysed experimentally using ex-situ CT to get a highly spatially resolved 3D-image of the object. In this context, highly X-ray attenuating materials enhancing the visibility of the sheet-sheet interface are investigated. Secondly, the test specimens are modelled using finite element method (FEM) and a transient dynamic analysis (TDA) is conducted to study the effect of the geometrical differences on the deformation energy and to qualify the TDA as a fast in-situ non-destructive method for characterizing clinch points at high temporal resolution.}}, author = {{Köhler, Daniel and Sadeghian, Behdad and Kupfer, Robert and Troschitz, Juliane and Gude, Maik and Brosius, Alexander}}, issn = {{1662-9795}}, journal = {{Key Engineering Materials}}, keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}}, pages = {{89--96}}, publisher = {{Trans Tech Publications, Ltd.}}, title = {{{A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis}}}, doi = {{10.4028/www.scientific.net/kem.883.89}}, volume = {{883}}, year = {{2021}}, } @article{51200, abstract = {{As lightweight design gains more and more attention, time and cost-efficient joining methods such as clinching are becoming more popular. A clinch point’s quality is usually determined by ex situ destructive analyses such as microsectioning. However, these methods do not yield the detection of phenomena occurring during loading such as elastic deformations and cracks that close after unloading. Alternatively, in situ computed tomography (in situ CT) can be used to investigate the loading process of clinch points. In this paper, a method for in situ CT analysis of a single-lap shear test with clinched metal sheets is presented at the example of a clinched joint with two 2 mm thick aluminum sheets. Furthermore, the potential of this method to validate numerical simulations is shown. Since the sheets’ surfaces are locally in contact with each other, the interface between both aluminum sheets and therefore the exact contour of the joining partners is difficult to identify in CT analyses. To compensate for this, the application of copper varnish between the sheets is investigated. The best in situ CT results are achieved with both sheets treated. It showed that with this treatment, in situ CT is suitable to properly observe the three-dimensional deformation behavior and to identify the failure modes.}}, author = {{Köhler, Daniel and Kupfer, Robert and Troschitz, Juliane and Gude, Maik}}, issn = {{1996-1944}}, journal = {{Materials}}, keywords = {{General Materials Science}}, number = {{8}}, publisher = {{MDPI AG}}, title = {{{In Situ Computed Tomography—Analysis of a Single-Lap Shear Test with Clinch Points}}}, doi = {{10.3390/ma14081859}}, volume = {{14}}, year = {{2021}}, } @article{41508, author = {{Camberg, Alan Adam and Andreiev, Anatolii and Pramanik, Sudipta and Hoyer, Kay-Peter and Tröster, Thomas and Schaper, Mirko}}, issn = {{0921-5093}}, journal = {{Materials Science and Engineering: A}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}}, publisher = {{Elsevier BV}}, title = {{{Strength enhancement of AlMg sheet metal parts by rapid heating and subsequent cold die stamping of severely cold-rolled blanks}}}, doi = {{10.1016/j.msea.2021.142312}}, volume = {{831}}, year = {{2021}}, } @article{29747, author = {{Jurgen von Bardeleben, Hans and Cantin, Jean-Louis and Gerstmann, Uwe and Schmidt, Wolf Gero and Biktagirov, Timur}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, keywords = {{Mechanical Engineering, Condensed Matter Physics, General Materials Science, General Chemistry, Bioengineering}}, number = {{19}}, pages = {{8119--8125}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Spin Polarization, Electron–Phonon Coupling, and Zero-Phonon Line of the NV Center in 3C-SiC}}}, doi = {{10.1021/acs.nanolett.1c02564}}, volume = {{21}}, year = {{2021}}, } @article{40571, author = {{Kossmann, Janina and Piankova, Diana and Tarakina, Nadezda V. and Heske, Julian and Kühne, Thomas D. and Schmidt, Johannes and Antonietti, Markus and Lopez Salas, Nieves}}, issn = {{0008-6223}}, journal = {{Carbon}}, keywords = {{General Chemistry, General Materials Science}}, publisher = {{Elsevier BV}}, title = {{{Corrigendum to ‘Guanine condensates as covalent materials and the concept of cryptopores’ [Carbon 172 (2021) 497–505]}}}, doi = {{10.1016/j.carbon.2021.06.084}}, volume = {{182}}, year = {{2021}}, } @article{33647, author = {{Kossmann, Janina and Piankova, Diana and Tarakina, Nadezda V. and Heske, Julian Joachim and Kühne, Thomas and Schmidt, Johannes and Antonietti, Markus and López-Salas, Nieves}}, issn = {{0008-6223}}, journal = {{Carbon}}, keywords = {{General Chemistry, General Materials Science}}, pages = {{497--505}}, publisher = {{Elsevier BV}}, title = {{{Guanine condensates as covalent materials and the concept of cryptopores}}}, doi = {{10.1016/j.carbon.2020.10.047}}, volume = {{172}}, year = {{2020}}, } @article{34092, abstract = {{Block copolymer (BCP) self-assembly is a promising tool for next generation lithography as microphase separated polymer domains in thin films can act as templates for surface nanopatterning with sub-20 nm features. The replicated patterns can, however, only be as precise as their templates. Thus, the investigation of the morphology of polymer domains is of great importance. Commonly used analytical techniques (neutron scattering, scanning force microscopy) either lack spatial information or nanoscale resolution. Using advanced analytical (scanning) transmission electron microscopy ((S)TEM), we provide real space information on polymer domain morphology and interfaces between polystyrene (PS) and polymethylmethacrylate (PMMA) in cylinder- and lamellae-forming BCPs at highest resolution. This allows us to correlate the internal structure of polymer domains with line edge roughnesses, interface widths and domain sizes. STEM is employed for high-resolution imaging, electron energy loss spectroscopy and energy filtered TEM (EFTEM) spectroscopic imaging for material identification and EFTEM thickness mapping for visualisation of material densities at defects. The volume fraction of non-phase separated polymer species can be analysed by EFTEM. These methods give new insights into the morphology of polymer domains the exact knowledge of which will allow to improve pattern quality for nanolithography.}}, author = {{Bürger, Julius and Kunnathully, Vinay and Kool, Daniel and Lindner, Jörg and Brassat, Katharina}}, issn = {{2079-4991}}, journal = {{Nanomaterials}}, keywords = {{General Materials Science, General Chemical Engineering}}, number = {{1}}, publisher = {{MDPI AG}}, title = {{{Characterisation of the PS-PMMA Interfaces in Microphase Separated Block Copolymer Thin Films by Analytical (S)TEM}}}, doi = {{10.3390/nano10010141}}, volume = {{10}}, year = {{2020}}, } @article{34093, author = {{Riedl, Thomas and Kunnathully, V. S. and Trapp, A. and Langer, T. and Reuter, Dirk and Lindner, Jörg}}, issn = {{2475-9953}}, journal = {{Physical Review Materials}}, keywords = {{Physics and Astronomy (miscellaneous), General Materials Science}}, number = {{1}}, publisher = {{American Physical Society (APS)}}, title = {{{Strain-driven InAs island growth on top of GaAs(111) nanopillars}}}, doi = {{10.1103/physrevmaterials.4.014602}}, volume = {{4}}, year = {{2020}}, } @article{47956, abstract = {{Optically nonlinear Pb2B5O9X (X = Cl, Br) borate halides are an important group of materials for second harmonic generation (SHG). Additionally, they also possess excellent photocatalytic activity and stability in the process of dechlorination of chlorophenols, which are typical persistent organic pollutants. It would be of great interest to conduct in situ (photo‐) catalysis investigations during the whole photocatalytic process by SHG when considering them as photocatalytic materials. In order to get superior photocatalytic efficiency and maximum surface information, small particles are highly desired. Here, a low‐cost and fast synthesis route that allows growing microcrystalline optically nonlinear Pb2B5O9X borate halides at large quantities is introduced. When applying the ionothermal growth process at temperatures between 130 and 170 °C, microcrystallites with an average size of about 1 µm precipitate with an orthorhombic hilgardite‐like borate halide structure. Thorough examinations using powder X‐ray diffraction and scanning electron microscopy, the Pb2B5O9X microcrystals are indicated to be chemically pure and single‐phased. Besides, the Pb2B5O9X borate halides' SHG efficiencies are confirmed using confocal SHG microscopy. The low‐temperature synthesis route thus makes these borate halides a highly desirable material for surface studies such as monitoring chemical reactions with picosecond time resolution and in situ (photo‐) catalysis investigations.}}, author = {{Tan, Deming and Kirbus, Benjamin and Rüsing, Michael and Pietsch, Tobias and Ruck, Michael and Eng, Lukas M.}}, issn = {{1613-6810}}, journal = {{Small}}, keywords = {{Biomaterials, Biotechnology, General Materials Science, General Chemistry}}, number = {{23}}, publisher = {{Wiley}}, title = {{{Resource‐Efficient Low‐Temperature Synthesis of Microcrystalline Pb2B5O9X (X = Cl, Br) for Surfaces Studies by Optical Second Harmonic Generation}}}, doi = {{10.1002/smll.202000857}}, volume = {{16}}, year = {{2020}}, } @article{35859, author = {{Risse, Anna Margareta and Schmidtke, Jürgen and Kitzerow, Heinz-Siegfried}}, issn = {{0267-8292}}, journal = {{Liquid Crystals}}, keywords = {{Condensed Matter Physics, General Materials Science, General Chemistry}}, number = {{7}}, pages = {{1025--1033}}, publisher = {{Informa UK Limited}}, title = {{{Dynamics of a liquid crystal-based modulator with germanium substrates for mid-infrared radiation}}}, doi = {{10.1080/02678292.2020.1839803}}, volume = {{48}}, year = {{2020}}, } @article{35868, abstract = {{Rod-like and sheet-like nano-particles made of desoxyribonucleic acid (DNA) fabricated by the DNA origami method (base sequence-controlled self-organized folding of DNA) are dispersed in a lyotropic chromonic liquid crystal made of an aqueous solution of disodium cromoglycate. The respective liquid crystalline nanodispersions are doped with a dichroic fluorescent dye and their orientational order parameter is studied by means of polarized fluorescence spectroscopy. The presence of the nano-particles is found to slightly reduce the orientational order parameter of the nematic mesophase. Nano-rods with a large length/width ratio tend to preserve the orientational order, while more compact stiff nano-rods and especially nano-sheets reduce the order parameter to a larger extent. In spite of the difference between the sizes of the DNA nano-particles and the rod-like columnar aggregates forming the liquid crystal, a similarity between the shapes of the former and the latter seems to be better compatible with the orientational order of the liquid crystal.}}, author = {{Zhang, Bingru and Martens, Kevin and Kneer, Luisa and Funck, Timon and Nguyen, Linh and Berger, Ricarda and Dass, Mihir and Kempter, Susanne and Schmidtke, Jürgen and Liedl, Tim and Kitzerow, Heinz-Siegfried}}, issn = {{2079-4991}}, journal = {{Nanomaterials}}, keywords = {{General Materials Science, General Chemical Engineering}}, number = {{9}}, publisher = {{MDPI AG}}, title = {{{DNA Origami Nano-Sheets and Nano-Rods Alter the Orientational Order in a Lyotropic Chromonic Liquid Crystal}}}, doi = {{10.3390/nano10091695}}, volume = {{10}}, year = {{2020}}, } @article{40577, author = {{Tian, Zhihong and Lopez Salas, Nieves and Liu, Chuntai and Liu, Tianxi and Antonietti, Markus}}, issn = {{2198-3844}}, journal = {{Advanced Science}}, keywords = {{General Physics and Astronomy, General Engineering, Biochemistry, Genetics and Molecular Biology (miscellaneous), General Materials Science, General Chemical Engineering, Medicine (miscellaneous)}}, number = {{24}}, publisher = {{Wiley}}, title = {{{C 2 N: A Class of Covalent Frameworks with Unique Properties}}}, doi = {{10.1002/advs.202001767}}, volume = {{7}}, year = {{2020}}, } @article{40576, author = {{Kossmann, Janina and Heil, Tobias and Antonietti, Markus and Lopez Salas, Nieves}}, issn = {{1864-5631}}, journal = {{ChemSusChem}}, keywords = {{General Energy, General Materials Science, General Chemical Engineering, Environmental Chemistry}}, number = {{24}}, pages = {{6643--6650}}, publisher = {{Wiley}}, title = {{{Guanine‐Derived Porous Carbonaceous Materials: Towards C 1 N 1}}}, doi = {{10.1002/cssc.202002274}}, volume = {{13}}, year = {{2020}}, }