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In Situ Electric-Field Control of THz Nonreciprocal Directional Dichroism in the Multiferroic Ba2CoGe2O7

Physical Review Letters 2021年第15期127卷 157201-157201页

作者： J. Vít J. Viirok L. Peedu T. Rõõm U. Nagel V. Kocsis Y. Tokunaga Y. Taguchi Y. Tokura I. Kézsmárki P. Balla K. Penc J. Romhányi S. Bordács Department of Physics Budapest University of Technology and Economics 1111 Budapest Hungary Institute of Physics ASCR Na Slovance 2 182 21 Prague 8 Czech Republic Faculty of Nuclear Science and Physical Engineering Czech Technical University Břehová 7 115 19 Prague 1 Czech Republic National Institute of Chemical Physics and Biophysics Akadeemia tee 23 12618 Tallinn Estonia RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan Department of Advanced Materials Science University of Tokyo Kashiwa 277-8561 Japan Department of Applied Physics and Tokyo College University of Tokyo Tokyo 113-8656 Japan Experimental Physics V Center for Electronic Correlations and Magnetism University of Augsburg 86135 Augsburg Germany Institute for Solid State Physics and Optics Wigner Research Centre for Physics P.O. Box. 49 H-1525 Budapest Hungary Department of Physics and Astronomy University of California Irvine 4129 Frederick Reines Hall Irvine California 92697 USA Hungarian Academy of Sciences Premium Postdoctor Program 1051 Budapest Hungary

Nonreciprocal directional dichroism, also called the optical-diode effect, is an appealing functional property inherent to the large class of noncentrosymmetric magnets. However, the in situ electric control of this phenomenon is challenging as it requires a set of conditions to be fulfilled: Special symmetries of the magnetic ground state, spin excitations with comparable magnetic- and electric-dipole activity, and switchable electric polarization. We demonstrate the isothermal electric switch between domains of Ba2CoGe2O7 possessing opposite magnetoelectric susceptibilities. Combining THz spectroscopy and multiboson spin-wave analysis, we show that unbalancing the population of antiferromagnetic domains generates the nonreciprocal light absorption of spin excitations.

关键词： Magnetoelectric effect Magnons Optical & microwave phenomena Antiferromagnets Multiferroics

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Erratum to ‘Effect of soft segment molecular weight on the microcellular foaming behavior of TPU using supercritical CO 2 ’ [J. Supercrit. Fluids, 160, 2020, 104816]

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The Journal of Supercritical Fluids 2021年 171卷

作者： Mohammadreza Nofar Bige Batı Emine Büşra Küçük Amirjalal Jalali Metallurgical & Materials Engineering Department Faculty of Chemical and Metallurgical Engineering Istanbul Technical University Maslak Istanbul 34469 Turkey Polymer Science and Technology Program Istanbul Technical University Maslak Istanbul 34469 Turkey Microcellular Plastics Manufacturing Laboratory Department of Mechanical and Industrial Engineering University of Toronto Toronto Ontario M5S 3G8 Canada

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Superior Metal-Organic Framework Activation with Dimethyl Ether

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Angewandte Chemie 2022年第52期134卷

作者： Keenan R. Wright Dr. Karabi Nath Prof. Dr. Adam J. Matzger Department of Chemistry Institution University of Michigan 930 North University Avenue Ann Arbor MI 48109-1055 USA Contribution: Conceptualization (lead) Data curation (lead) Investigation (lead) Methodology (lead) Writing - original draft (lead) Writing - review & editing (lead) Contribution: Methodology (supporting) Writing - review & editing (supporting) Department of Chemistry and Macromolecular Science and Engineering Program University of Michigan 930 North University Avenue Ann Arbor MI 48109-1055 USA

Metal–organic frameworks (MOFs) are demonstrated to be readily activated by treatment with the low surface tension, low boiling point solvent dimethyl ether (DME). The mildness of the method enables access to high surface areas by avoiding structural changes in the framework that often plague thermal activation methods. A distinction from previous methods is that DME activation succeeds for materials with coordinatively unsaturated sites (CUS) and non-CUS MOFs as well. DME displaces solvent molecules occupying the pores of the MOF as well as those coordinated to metal centers; reducing evacuation temperature by using a coordinating, yet highly volatile guest enables low temperature activation with structural retention as demonstrated surface area measurements that match or exceed existing activation protocols.

关键词： Coordination Chemistry Metal–Organic Frameworks Microporous Materials Structural Collapse Surface Area

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Study of Biogas Production from Cassava Industrial Waste by Anaerobic Process 24

Study of Biogas Production from Cassava Industrial Waste by ...

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24th Regional Symposium on chemical engineering, RSCE 2017

作者： Budiyono Primaloka, Arindra D. Ardhannari, Listi Matin, Hashfi H.A. Sumardiono, Siswo Department of Chemical Engineering Engineering Faculty Diponegoro University Semarang50275 Indonesia Master Program of Environmental Science School of Post-Graduate Studies Diponegoro University Semarang50275 Indonesia

Biogas production processes from tapioca wastewater have several problems that cause the biogas production is not optimal, such as pH drop at beginning of the process because the rate of acid formation is too fast and the rate of starch wastewater degradation is too slow. Therefore, to obtain optimal biogas production it is required two-stage reactor. The purposes of this research were to (i) study the influence of one stage fermentation and two stage fermentation on biogas production, (ii) study the effect of buffer Na2CO3 on biogas production, and (iii) study the effect of methanogenic bacteria concentration on biogas production from cassava starch effluent. The first method of our research was hydrolysis process by "Saccharomyces cereviceae" as substrate activator. The second is the arrangement of pH and the last is process of methane production. The results showed that the highest biogas production is achieved at concentration of methanogenic bacteria 20% (v/v) that is equal to 2458 ml. At concentration of 8% (v/v) and 15% (v/v), biogas production was 2105 ml and 2117 ml. The addition of Na2CO3 can extend to 16 days with accumulation of 372 ml. While without the addition of buffer, biogas production period was only 9 days with accumulation of 620 ml. In semi continuous process, the analysis carried out every 3 days. Highest biogas production achieved in the variable addition of yeast with the accumulation 9329 ml. Without yeast, accumulation of biogas was 6831 ml. Yeast is use as substrate activator so it can accelerate the hydrolysis process and increased biogas production. The addition of Na2CO3 is increase the alkalinity so the pH drop did not occur early in the process. © The Authors, published by EDP sciences, 2018.

关键词： Yeast

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Production of Biogas from Organic Fruit Waste in Anaerobic Digester using Ruminant as the Inoculum 24

Production of Biogas from Organic Fruit Waste in Anaerobic D...

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24th Regional Symposium on chemical engineering, RSCE 2017

作者： Budiyono Manthia, Firliani Amalin, Nadya Hawali Abdul Matin, Hashfi Sumardiono, Siswo Department of Chemical Engineering Engineering Faculty Diponegoro University Semarang50275 Indonesia Master Program of Environmental Science School of Post Graduate Studies Diponegoro University Semarang50275 Indonesia

Organic waste, fruit waste and vegetable waste are the best substrate to produce biogas. Waste management system for producing biogas can be used as a solution with the waste problem by converting the wastes into biogas. This study is expected to review of the effect of substrate type and substrate composition for the volume of biogas produced. In this study, materials consist of fruit wastes (oranges, apples, papayas, and tomatoes), cow ruminant, urea, cow dung, Na2CO3 buffer, NH4HCO3 buffer, and distilled water with variations of the substrate materials, F/ W, and the buffer types. The addition of cow manure and Na2CO3 buffer with 1:2 of F/W, production of biogas is greater than variable which is used NH4HCO3 buffer and without the addition of cow dung. Variables with addition of cow dung with 1:1 of F/W and using Na2CO3 buffer, the result is greater than the variable using the same buffer but without the addition of cow dung and variables with 1:1 of F/W with the addition of cow dung and Na2CO3 buffer and variables with the same feed and without the addition of cow dung produce more biogases than variable which is the using NH4HCO3 buffer, 1:1 of F/W and without the addition of cow dung. © The Authors, published by EDP sciences, 2018.

关键词： Biogas

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Delayed Linker Addition (DLA) Synthesis for Hybrid SOD ZIFs with Unsubstituted Imidazolate Linkers for Propylene/Propane and n-Butane/i-Butane Separations

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Angewandte Chemie 2021年第18期133卷

作者： Dr. Febrian Hillman Dr. Mohamad Rezi Abdul Hamid Dr. Panagiotis Krokidas Dr. Salvador Moncho Prof. Dr. Edward N. Brothers Prof. Dr. Ioannis G. Economou Prof. Dr. Hae-Kwon Jeong Artie McFerrin Department of Chemical Engineering Texas A&M University 3122 TAMU College Station TX 77843-3122 USA Department of Chemical and Environmental Engineering Universiti Putra Malaysia Serdang Selangor 43400 Malaysia National Center for Scientific Research “Demokritos” Institute of Nanoscience and Nanotechnology Molecular Thermodynamics and Modelling of Materials Laboratory 15310 Aghia Paraskevi Attikis Greece Science Program Texas A&M University at Qatar P.O. Box 23874 Education City Doha Qatar Chemical Engineering Program Texas A&M University at Qatar P.O. Box 23874 Education City Doha Qatar Department of Materials Science and Engineering Texas A&M University 3122 TAMU College Station TX 77843-3122 USA

We present a novel synthesis strategy termed delayed linker addition (DLA) to synthesize hybrid zeolitic-imidazolate frameworks containing unsubstituted imidazolate linkers (Im) with SOD topology (hereafter termed Im/ZIF-8). Im linker incorporation can create larger voids and apertures, which are important properties for gas storage and separation. To date, there have been only a handful of reports of Im linkers incorporated into ZIF-8 frameworks, typically requiring arduous and complicated post synthesis approaches. DLA, as reported here, is a simple one-step synthesis strategy allowing high incorporation of Im linker into the ZIF-8 framework while still retaining its SOD topology. We fabricated mixed-matrix membranes (MMMs) with 6FDA-DAM polymer and Im/ZIF-8 obtained via DLA as a filler. The Im/ZIF-8-containing MMMs showed excellent performance for both propylene/propane and n-butane/i-butane separation, displaying permeability and ideal selectivity well above the polymer upper bound. Moreover, highly detailed molecular simulations shed light to the aperture size and flexibility response of Im/ZIF-8 and its improved diffusivity as compared to ZIF-8.

关键词： gas separations hybrid metal–organic frameworks hybrid zeolitic–imidazolate frameworks linker doping

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Self-assembled periodic nanostructures using martensitic phase transformations

arXiv

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arXiv 2020年

作者： Prakash, Abhinav Wang, Tianqi Bucsek, Ashley Truttmann, Tristan K. Fali, Alireza Cotrufo, Michele Yun, Hwanhui Kim, Jong-Woo Ryan, Philip J. Mkhoyan, K. Andre Alù, Andrea Abate, Yohannes James, Richard D. Jalan, Bharat Department of Chemical Engineering and Materials Science University of Minnesota – Twin Cities MinneapolisMN55455 United States Department of Aerospace Engineering and Mechanics University of Minnesota – Twin Cities MinneapolisMN55455 United States Department of Mechanical Engineering University of Michigan Ann ArborMI48109 United States Department of Physics and Astronomy University of Georgia AthensGA30602 United States Photonics Initiative Advanced Science Research Center City University of New York NY10031 United States Advanced Photon Source Argonne National Laboratory ArgonneIL60439 United States Physics Program Graduate Center City University of New York New YorkNY10016 United States

We describe a novel approach for the rational design and synthesis of self-assembled periodic nanostructures using martensitic phase transformations. We demonstrate this approach in a thin film of perovskite SrSnO3 with reconfigurable periodic nanostructures consisting of regularly spaced regions of sharply contrasted dielectric properties. The films can be designed to have different periodicities and relative phase fractions via chemical doping or strain engineering. The dielectric contrast within a single film can be tuned using temperature and laser wavelength, effectively creating a variable photonic crystal. Our results show the realistic possibility of designing large-area self-assembled periodic structures using martensitic phase transformations with the potential of implementing "built-to-order" nanostructures for tailored optoelectronic functionalities. Copyright © 2020, The Authors. All rights reserved.

关键词： Thin films

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programmable Chromism and Photoluminescence of Spiropyran-Based Liquid Crystalline Polymer with Tunable Glass Transition Temperature

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Angewandte Chemie 2021年第35期133卷

作者： Wei Hu Chang Sun Yunxiao Ren Shengyu Qin Yu Shao Lanying Zhang Yu Wu Qian Wang Huai Yang Dengke Yang Beijing Advanced Innovation Center for Materials Genome Engineering & Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 P. R. China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 P. R. China Department of Obstetrics and Gynecology Peking University Third Hospital Beijing 100191 P. R. China Chemical Physics Interdisciplinary Program in Liquid Crystal Institute Kent State University Kent OH 44242 USA

Spiropyran-based materials (SPBMs) can give responses to the stimulations induced by the light, heat, force, or pH, which have been used as triggers for many smart materials. Here, a cross-linkable SPBM containing mesogenic-units is synthesized, which is pale-colored, non-photoluminescent and non-mesogenic at a spiro form, but dark-colored, photoluminescent, and mesogenic at a merocyanine form. Moreover, the dynamic interconversion behavior of the form in the different chemical environments are distinct. Liquid crystalline polymers (LCPs) containing the SPBMs cross-linked via visible light, own a photoswitchable glass transition temperature ( T g ) and retain the switchable property; however, the SPBMs cross-linked via UV light will be locked at the MC state, because the molecular movement was frozen at the room temperature lower than the given T g of the LCP. Thus, programmable chromism and photoluminescence based on the tunable T g can be endowed to the functional materials prepared from the SPBMs.

关键词： chromism liquid crystalline polymer photoluminescence spiropyran-based tunable Tg

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Current md forcefields fail to capture key features of protein structure and fluctuations: a case study of cyclophilin a and t4 lysozyme

arXiv

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arXiv 2020年

作者： Mei, Zhe Grigas, Alex T. Treado, John D. Corres, Gabriel Melendez Vuorte, Maisa Sammalkorpi, Maria Regan, Lynne Levine, Zachary A. O’Hern, Corey S. Department of Chemistry Yale University New HavenCT06520 United States Integrated Graduate Program in Physical and Engineering Biology Yale University New HavenCT06520 United States Graduate Program in Computational Biology and Bioinformatics Yale University New HavenCT06520 United States Department of Mechanical Engineering and Materials Science Yale University New HavenCT06520 United States Department of Biology UPR Humacao Puerto RicoHumacao00792 Puerto Rico Department of Chemistry and Materials Science School of Chemical Engineering Aalto University Aalto Finland Department of Bioproducts and Biosystems School of Chemical Engineering Aalto University Aalto Finland Institute of Quantitative Biology Biochemistry and Biotechnology Center for Synthetic and Systems Biology School of Biological Sciences University of Edinburgh Edinburgh United Kingdom Department of Pathology Yale School of Medicine New HavenCT06520 United States Department of Molecular Biophysics and Biochemistry Yale University New HavenCT06520 United States Department of Physics Yale University New HavenCT06520 United States Department of Applied Physics Yale University New HavenCT06520 United States

Globular proteins undergo thermal fluctuations in solution, while maintaining an overall well-defined folded structure. In particular, studies have shown that the core structure of globular proteins differs in small, but significant ways when they are solved by x-ray crystallography versus solution-based NMR spectroscopy. Given these discrepancies, it is unclear whether molecular dynamics (MD) simulations can accurately recapitulate protein conformations. We therefore perform extensive MD simulations across multiple force fields and sampling techniques to investigate the degree to which computer simulations can capture the ensemble of conformations observed in experiments. By analyzing fluctuations in the atomic coordinates and core packing, we show that conformations sampled in MD simulations both move away from and sample a larger conformational space than the ensemble of structures observed in NMR experiments. However, we find that adding inter-residue distance restraints that match those obtained via Nuclear Overhauser Effect measurements enables the MD simulations to sample more NMR-like conformations, though significant differences between the core packing features in restrained MD and the NMR ensemble remain. Given that the protein structures obtained from the MD simulations possess smaller and less dense protein cores compared to those solved by NMR, we suggest that future improvements to MD forcefields should aim to increase the packing of hydrophobic residues in protein cores. © 2020, CC BY.

关键词： Molecular dynamics

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Ductile-to-brittle transition and yielding in soft amorphous materials: perspectives and open questions

arXiv

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arXiv 2023年

作者： Divoux, Thibaut Agoritsas, Elisabeth Aime, Stefano Barentin, Catherine Barrat, Jean-Louis Benzi, Roberto Berthier, Ludovic Bi, Dapeng Biroli, Giulio Bonn, Daniel Bourrianne, Philippe Bouzid, Mehdi Del Gado, Emanuela Delanoë-Ayari, Hélène Farain, Kasra Fielding, Suzanne Fuchs, Matthias van der Gucht, Jasper Henkes, Silke Jalaal, Maziyar M. Joshi, Yogesh Lemaître, Anaël Leheny, Robert L. Manneville, Sébastien Martens, Kirsten Poon, Wilson C.K. Popović, Marko Procaccia, Itamar Ramos, Laurence Richards, James A. Rogers, Simon Rossi, Saverio Sbragaglia, Mauro Tarjus, Gilles Toschi, Federico Trappe, Véronique Vermant, Jan Wyart, Matthieu Zamponi, Francesco Zare, Davoud Molecular Macromolecular Chemistryand Materials ESPCI Paris Paris France Univ. de Lyon Universite Claude Bernard Lyon 1 CNRS Institut Lumiere Matiere VilleurbanneF-69622 France Soft Matter Group Van der Waals-Zeeman Institute University of Amsterdam Science Park 904 Amsterdam1098XH Netherlands Universite Montpellier CNRS Montpellier France SUPA and the School of Physics and Astronomy The University of Edinburgh Peter Guthrie Tait Road EdinburghEH9 3FD United Kingdom Universite Grenoble Alpes CNRS LIPhy Grenoble38000 France Laboratoire de Physique de l'Ecole Normale Superieure ENS Universite PSL CNRS Sorbonne Universite Universite de Paris ParisF-75005 France LPTMC CNRS-UMR 7600 Sorbonne Universite 4 Pl. Jussieu ParisF-75005 France Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom Navier Ecole des Ponts Univ Gustave Eiffel CNRS Marne-la-Vallee France University of Geneva Quai Ernest-Ansermet 24 GenevaCH-1211 Switzerland Department of Physics and Astronomy Johns Hopkins University BaltimoreMD21218 United States Dipartimento di Fisica INFN Universita di Roma "Tor Vergata" Via della Ricerca Scientifica RomeI-00133 Italy Department of Applied Physics and Science Education Eindhoven University of Technology P.O. Box 513 Eindhoven9 5600 MB Netherlands CNR-IAC Via dei Taurini 19 Rome00185 Italy ENSL CNRS Laboratoire de physique LyonF-69342 France Max Planck Institute for the Physics of Complex Systems Nothnitzer Str.38 Dresden01187 Germany Georgetown University Department of Physics Institute for Soft Matter Synthesis and Metrology WashingtonDC United States Department of Materials ETH Zurich Vladimir Prelog Weg 5 Zurich8032 Switzerland Physical Chemistry and Soft Matter Wageningen University & Research Stippeneng 4 Wageningen6708WE Netherlands Univ. Grenoble Alpes CNRS Grenoble INP 3SR GrenobleF-38000 France PMMH ESPCI Paris France Fachbereich Physik Universitat Konstanz Konst

Soft amorphous materials are viscoelastic solids ubiquitously found around us, from clays and cementitious pastes to emulsions and physical gels encountered in food or biomedical engineering. Under an external deformation, these materials undergo a noteworthy transition from a solid to a liquid state that reshapes the material microstructure. This yielding transition was the main theme of a workshop held from January 9 to 13, 2023 at the Lorentz Center in Leiden. The manuscript presented here offers a critical perspective on the subject, synthesizing insights from the various brainstorming sessions and informal discussions that unfolded during this week of vibrant exchange of ideas. The result of these exchanges takes the form of a series of open questions that represent outstanding experimental, numerical, and theoretical challenges to be tackled in the near future. © 2023, CC BY.

关键词： Biomedical engineering

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