@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}}, } @article{40574, 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}}, 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{41027, abstract = {{AbstractFluoride ion batteries (FIBs) are a recent alternative all-solid-state battery technology. However, the FIB systems proposed so far suffer from poor cycling performance. In this work, we report La2NiO4.13 with a Ruddlesden-Popper type structure as an intercalation-based active cathode material in all solid-state FIB with excellent cycling performance. The critical charging conditions to maintain the conductivity of the cell were determined, which seems to be a major obstacle towards improving the cycling stability of FIBs. For optimized operating conditions, a cycle life of about 60 cycles and over 220 cycles for critical cut-off capacities of 50 mAh/g and 30 mAh/g, respectively, could be achieved, with average Coulombic efficiencies between 95 – 99%. Cycling of the cell is a result of fluorination/de-fluorination into and from the La2NiO4+d cathode, and it is revealed that La2NiO4.13 is a multivalent electrode material. Our findings suggest that La2NiO4.13 is a promising high energy cathode for FIBs.}}, author = {{Nowroozi, Mohammad Ali and Wissel, Kerstin and Donzelli, Manuel and Hosseinpourkahvaz, Niloofar and Plana-Ruiz, Sergi and Kolb, Ute and Schoch, Roland and Bauer, Matthias and Malik, Ali Muhammad and Rohrer, Jochen and Ivlev, Sergei and Kraus, Florian and Clemens, Oliver}}, issn = {{2662-4443}}, journal = {{Communications Materials}}, keywords = {{Mechanics of Materials, General Materials Science}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{High cycle life all-solid-state fluoride ion battery with La2NiO4+d high voltage cathode}}}, doi = {{10.1038/s43246-020-0030-5}}, volume = {{1}}, year = {{2020}}, } @article{41029, author = {{Naumova, Maria A. and Kalinko, Aleksandr and Wong, Joanne W. L. and Abdellah, Mohamed and Geng, Huifang and Domenichini, Edoardo and Meng, Jie and Gutierrez, Sol Alvarez and Mante, Pierre-Adrien and Lin, Weihua and Zalden, Peter and Galler, Andreas and Lima, Frederico and Kubicek, Katharina and Biednov, Mykola and Britz, Alexander and Checchia, Stefano and Kabanova, Victoria and Wulff, Michael and Zimara, Jennifer and Schwarzer, Dirk and Demeshko, Serhiy and Murzin, Vadim and Gosztola, David and Jarenmark, Martin and Zhang, Jianxin and Bauer, Matthias and Lawson Daku, Max Latevi and Gawelda, Wojciech and Khakhulin, Dmitry and Bressler, Christian and Meyer, Franc and Zheng, Kaibo and Canton, Sophie E.}}, issn = {{1948-7185}}, journal = {{The Journal of Physical Chemistry Letters}}, keywords = {{General Materials Science, Physical and Theoretical Chemistry}}, number = {{6}}, pages = {{2133--2141}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Revealing Hot and Long-Lived Metastable Spin States in the Photoinduced Switching of Solvated Metallogrid Complexes with Femtosecond Optical and X-ray Spectroscopies}}}, doi = {{10.1021/acs.jpclett.9b03883}}, volume = {{11}}, year = {{2020}}, } @article{41819, abstract = {{AbstractBlock copolymers were prepared with two anionic polyelectrolyte blocks: sodium polyacrylate (PA) and sodium polystyrene sulfonate (PSS), in order to investigate their phase behavior in aqueous solution in the presence of Ca2+ cations. Depending on the concentration of polymer and Ca2+ and on the ratio of the block lengths in the copolymer, spherical micelles were observed. Micelle formation arises from the specific interaction of Ca2+ with the PA block only. An extensive small-angle scattering study was performed in order to unravel the structure and dimensions of the block copolymer micelles. Deuteration of the PA block enabled us to perform contrast variation experiments using small-angle neutron scattering at variable ratios of light and heavy water which were combined with information from small-angle X-ray scattering and dynamic light scattering.}}, author = {{Carl, Nico and Prévost, Sylvain and Schweins, Ralf and Huber, Klaus}}, issn = {{0303-402X}}, journal = {{Colloid and Polymer Science}}, keywords = {{Materials Chemistry, Colloid and Surface Chemistry, Polymers and Plastics, Physical and Theoretical Chemistry}}, number = {{7}}, pages = {{663--679}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Contrast variation of micelles composed of Ca2+ and block copolymers of two negatively charged polyelectrolytes}}}, doi = {{10.1007/s00396-019-04596-1}}, volume = {{298}}, year = {{2020}}, } @article{43160, abstract = {{Refill friction stir spot welding (RFSSW) is a highly flexible and promising solid-state joining method for aluminium alloys. Alternatively, resistance spot welding (RSW) can be stated as an appropriate joining method which can be automated and used within a high-volume production due to short process times. Both processes do not need any additional elements and a flat surface on both sides of the joints can be realised. In order to meet the modern requirements for crash safety and structural stiffness, thermal and mechanical joining methods are mainly combined by using single-component epoxy resin adhesives. Due to an insufficient knowledge about the application of both thermal joining methods for the abovementioned material combinations combined with additional adhesives, deeper investigations were done regarding the interactions of the polymers and the joining processes. Starting with a brief presentation of the boundary conditions of the investigations and the refill friction stir spot welding and resistance spot welding of high-strength aluminium alloys with sheet thicknesses bigger than 5.8 mm, the paper introduces the process-related joint properties of friction-based and resistance-based welded joints. Afterwards, the paper discusses the influences of the process parameter on the metallographic joint formation and load-bearing capacities for a selected two-sheet and four-sheet material combination. When combining the spot welding technologies with adhesives, the process parameters of the RFSSW process have to be adapted for the two-sheet combination by adding a squeeze-out step, while for RSW, just the preholding time has to be increased. Different challenges for both joining methods are shown. For RFSSW, the gap formation has to be considered when welding big total sheet thicknesses, while for RSW, the shape of the weld nugget is more important for an appropriate joint performance. Additionally, process optimisations for less adhesive incineration will be discussed for both joining processes, and the influences of the adhesive on the joint formation will be addressed with the help of load-bearing capacity evaluations. The paper closes with specific recommendations for the realisation of refill friction stir and resistance spot-welded joints with and without adhesive in the field of Al joints with big total sheet thicknesses which meet the quality demands and an outlook for further research steps will be given.}}, author = {{Schmal, Christopher and Meschut, Gerson}}, issn = {{0043-2288}}, journal = {{Welding in the World}}, keywords = {{Metals and Alloys, Mechanical Engineering, Mechanics of Materials}}, number = {{9}}, pages = {{1471--1480}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Refill friction stir spot and resistance spot welding of aluminium joints with large total sheet thicknesses (III-1965-19)}}}, doi = {{10.1007/s40194-020-00922-2}}, volume = {{64}}, year = {{2020}}, } @article{43162, abstract = {{Monitoring systems for machines, plants, materials and equipment are increasingly used in production processes. These online condition monitoring systems can detect damage or excessive loads at an early stage and can drastically reduce or prevent long downtimes of plants and machines as well as high repair and maintenance costs. This paper depicts a method for online crack detection with pattern recognition methods for specimens joined by self-pierce riveting under cyclic load in fatigue tests (laboratory application). A software specially conceived for this application was developed. This software, AnrissMF, uses active acoustic testing with a structure-borne sensor to detect cracks in the joints at a very early stage. It is shown in this paper that this software can detect cracks much earlier than classical failure criteria for joints (i. e. before any drop in stiffness or frequency is observed). Furthermore, the successful application of software AnrissMF for online crack detection during the fatigue strength test is presented.}}, author = {{Gollnick, Maik and Giese, Patrick and Hein, David and Meschut, Gerson and Herfert, Daniel}}, issn = {{2195-8572}}, journal = {{Materials Testing}}, keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}}, number = {{9}}, pages = {{877--882}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Early stage crack detection in mechanically joined steel/aluminum joints by condition monitoring}}}, doi = {{10.3139/120.111558}}, volume = {{62}}, year = {{2020}}, } @article{43161, author = {{Schmal, Christopher and Meschut, Gerson}}, issn = {{0043-2288}}, journal = {{Welding in the World}}, keywords = {{Metals and Alloys, Mechanical Engineering, Mechanics of Materials}}, number = {{3}}, pages = {{437--448}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Process characteristics and influences of production-related disturbances in resistance element welding of hybrid materials with steel cover sheets and polymer core}}}, doi = {{10.1007/s40194-019-00842-w}}, volume = {{64}}, year = {{2020}}, } @article{40233, author = {{Meier, Lukas and Braun, Christian and Hannappel, Thomas and Schmidt, Wolf Gero}}, issn = {{0370-1972}}, journal = {{physica status solidi (b)}}, keywords = {{Condensed Matter Physics, Electronic, Optical and Magnetic Materials}}, number = {{2}}, publisher = {{Wiley}}, title = {{{Band Alignment at Ga x In 1– x P/Al y In 1– y P Alloy Interfaces from Hybrid Density Functional Theory Calculations}}}, doi = {{10.1002/pssb.202000463}}, volume = {{258}}, year = {{2020}}, } @article{40435, abstract = {{

Coulomb binding energy is reduced when a few-molecule integer charge transfer complex (ICTC) is formed.

}}, author = {{Dong, Chuan-Ding and Schumacher, Stefan}}, issn = {{2050-7526}}, journal = {{Journal of Materials Chemistry C}}, keywords = {{Materials Chemistry, General Chemistry}}, number = {{34}}, pages = {{11929--11935}}, publisher = {{Royal Society of Chemistry (RSC)}}, title = {{{Molecular doping in few-molecule polymer-dopant complexes shows reduced Coulomb binding}}}, doi = {{10.1039/d0tc02185g}}, volume = {{8}}, year = {{2020}}, } @article{41519, abstract = {{AbstractDifferent studies have been demonstrated that the surface integrity of substrate bulk materials to be coated has a significant impact on the adhesion of thermally sprayed coatings. It is known that the surface integrity of parts processed by selective laser melting (SLM) differs from those obtained from bulk materials. Although 316L stainless steel is among the most investigated material for SLM, the adhesion of thermally sprayed coatings on 316L stainless steel substrates processed by SLM has not been studied yet. This study aims at evaluating the effect of various mechanical pre-treatments onto 316L stainless steel substrates processed by SLM and their effect on the adhesion of high velocity oxy-fuel (HVOF)-sprayed WC-Co coatings. To differentiate between topographical effects and residual stress-related phenomena, a stress-relief heat treatment of the SLM substrates served as a reference throughout the investigations. The differently pre-treated SLM substrates were investigated with regard to the surface roughness and residual stresses. For the HVOF-sprayed SLM composites, Vickers interfacial indentation tests were conducted to assess the resulting coating adhesion. The findings demonstrated that the HVOF-sprayed WC-Co coatings predominantly exhibit good adhesion to the SLM 316L substrates. However, it was found that the stress state in the SLM 316L substrate surface is more likely to affect the adhesion of the WC-Co coating, while the substrate surface roughness showed a marginal effect.}}, author = {{Tillmann, Wolfgang and Hagen, Leif and Schaak, Christoph and Liß, J. and Schaper, Mirko and Hoyer, Kay-Peter and Aydinöz, Mehmet Esat and Garthe, Kai-Uwe}}, issn = {{1059-9630}}, journal = {{Journal of Thermal Spray Technology}}, keywords = {{Materials Chemistry, Surfaces, Coatings and Films, Condensed Matter Physics}}, number = {{6}}, pages = {{1396--1409}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Adhesion of HVOF-Sprayed WC-Co Coatings on 316L Substrates Processed by SLM}}}, doi = {{10.1007/s11666-020-01081-y}}, volume = {{29}}, year = {{2020}}, } @article{41518, author = {{Tillmann, Wolfgang and Hagen, Leif and Garthe, Kai-Uwe and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0933-5137}}, journal = {{Materialwissenschaft und Werkstofftechnik}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}}, number = {{11}}, pages = {{1452--1464}}, publisher = {{Wiley}}, title = {{{Effect of substrate pre‐treatment on the low cycle fatigue performance of tungsten carbide‐cobalt coated additive manufactured 316 L substrates}}}, doi = {{10.1002/mawe.202000109}}, volume = {{51}}, year = {{2020}}, } @article{41520, author = {{Wu, Haoran and Bill, T. and Teng, Z.J. and Pramanik, Sudipta and Hoyer, Kay-Peter and Schaper, Mirko and Starke, Peter}}, 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 = {{{Characterization of the fatigue behaviour for SAE 1045 steel without and with load-free sequences based on non-destructive, X-ray diffraction and transmission electron microscopic investigations}}}, doi = {{10.1016/j.msea.2020.139597}}, volume = {{794}}, year = {{2020}}, } @article{41521, author = {{Tillmann, Wolfgang and Lopes Dias, Nelson Filipe and Stangier, Dominic and Hagen, Leif and Schaper, Mirko and Hengsbach, Florian and Hoyer, Kay-Peter}}, issn = {{0257-8972}}, journal = {{Surface and Coatings Technology}}, keywords = {{Materials Chemistry, Surfaces, Coatings and Films, Surfaces and Interfaces, Condensed Matter Physics, General Chemistry}}, publisher = {{Elsevier BV}}, title = {{{Tribo-mechanical properties and adhesion behavior of DLC coatings sputtered onto 36NiCrMo16 produced by selective laser melting}}}, doi = {{10.1016/j.surfcoat.2020.125748}}, volume = {{394}}, year = {{2020}}, } @article{41522, author = {{Andreiev, Anatolii and Hoyer, Kay-Peter and Grydin, Olexandr and Frolov, Yaroslav and Schaper, Mirko}}, issn = {{0933-5137}}, journal = {{Materialwissenschaft und Werkstofftechnik}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}}, number = {{4}}, pages = {{517--530}}, publisher = {{Wiley}}, title = {{{Degradable silver‐based alloys}}}, doi = {{10.1002/mawe.201900191}}, volume = {{51}}, year = {{2020}}, } @article{46010, abstract = {{

Enhanced OER performance of Ni(Fe) hydroxide through UV/ozone treatment.

}}, author = {{Pan, Ying and Wu, Yanfang and Hsain, H. Alex and Su, Ran and Cazorla, Claudio and Chu, Dewei}}, issn = {{2050-7488}}, journal = {{Journal of Materials Chemistry A}}, keywords = {{General Materials Science, Renewable Energy, Sustainability and the Environment, General Chemistry}}, number = {{27}}, pages = {{13437--13442}}, publisher = {{Royal Society of Chemistry (RSC)}}, title = {{{Synergetic modulation of the electronic structure and hydrophilicity of nickel–iron hydroxide for efficient oxygen evolution by UV/ozone treatment}}}, doi = {{10.1039/d0ta03470c}}, volume = {{8}}, year = {{2020}}, } @article{46002, abstract = {{

Electrocatalytic activities of electrodes for water splitting are assessed via geometric area, BET surface area and ECSA normalisations.

}}, author = {{Ren, Hangjuan and Pan, Ying and Sorrell, Charles C. and Du, Haiwei}}, issn = {{2050-7488}}, journal = {{Journal of Materials Chemistry A}}, keywords = {{General Materials Science, Renewable Energy, Sustainability and the Environment, General Chemistry}}, number = {{6}}, pages = {{3154--3159}}, publisher = {{Royal Society of Chemistry (RSC)}}, title = {{{Assessment of electrocatalytic activity through the lens of three surface area normalization techniques}}}, doi = {{10.1039/c9ta13170a}}, volume = {{8}}, year = {{2020}}, } @article{51203, author = {{Köhler, Daniel and Kupfer, Robert and Gude, Maik}}, issn = {{2666-3309}}, journal = {{Journal of Advanced Joining Processes}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Engineering (miscellaneous), Chemical Engineering (miscellaneous)}}, publisher = {{Elsevier BV}}, title = {{{Clinching in in-situ CT—A numerical study on suitable tool materials}}}, doi = {{10.1016/j.jajp.2020.100034}}, volume = {{2}}, year = {{2020}}, }