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Rheological property of the high solid coating color (II) - Evaluation of the interaction mechanism using rheometer

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2018年第5期50卷 132-140页

作者： Jeong, Kyoung-Mo Kim, Sun-Goo Won, Jong-Myoung Lee, Yong-Kyu Institute of Forest Science Kangwon National University Kangwondaehakgil-1 Chuncheon34231 Korea Republic of Program of Paper Science and Engineering Division of Forest Material Sciences and Engineering College of Forest and Environmental Sciences Kangwon National University Kangwondaehakgil-1 Chuncheon34231 Korea Republic of

Basic studies were conducted to understand the rheological properties of the coating colors and effectively utilize the information obtained from the rheometric test. For this purpose, the understanding and interpreting method for the interaction mechanism between the coating components were examined using the analyzing method of the viscosity and viscoelastic property of the coating colors. The coating solution exhibited shear thinning behavior as shear rate increased. The slope of the elastic curve (viscoelastic characteristic) of the coating color in the low frequency region (10-1-10°(rad/s)) was considered to be correlated with the strength of the interaction of the coating components. Although it was believed that the rheological properties of coating color independently influenced by the individual factors such as the binder type and the pigment packing structure (pigment mixture composition), the interaction of two or more factors may also have a complicated effect on the rheology of the coating color. © 2018 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Rheology

Rheological property of the high solid coating color (I) - Interaction between vae emulsion binder and other ingredients

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2018年第5期50卷 123-131页

作者： Kim, Sun-Goo Yang, Seung-Yeop Jeong, Kyoung-Mo Won, Jong-Myoung Lee, Yong-Kyu Program of Paper Science and Engineering Division of Forest Material Sciences and Engineering College of Forest and Environmental Sciences Kangwon National University Kangwondaehakgil-1 Chuncheon34231 Korea Republic of Institute of Forest Science Kangwon National University Kangwondaehakgil-1 Chuncheon34231 Korea Republic of

The effects of rheological properties of high solid coating colors on coated paper properties were investigated. For this purpose, a coating composition containing a pigment, a binder and a rheology modifier was selected. In order to analyze the interaction mechanism between the components of the coating colors, the rheological properties of the coating colors were measured and the results were analyzed. The correlation between the runnability at the high shear stage and the properties of the coated paper were evaluated. It was founded that the analysis of the rheological properties of a coating color using a rheometer was considered to be a very meaningful method for understanding the interaction mechanism of constituents such as VAE emulsion binder and rheology modifier and for analyzing the difference in flow characteristics (viscosity, viscoelastic properties). Interaction of the constituents of the coating color composed of the pigment, VAE emulsion binder and rheology modifier showed a close correlation with the thixotropy of the coating liquid (leveling index, etc.). When using the coating colors with VAE-3 emulsion binder having a good leveling index, the surface smoothness of the coated paper showed the best results. © 2018 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Viscosity

First-principles study of the effect of compressive strain on oxygen adsorption in Pd/Ni/Cu-alloy-core@Pd/Ir-alloy-shell catalysts

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arXiv 2019年

作者： De Lile, Jeffrey Roshan Lee, So Young Kim, Hyoung-Juhn Pak, Chanho Lee, Seung Geol Department of Organic Material Science and Engineering Pusan National University 2 Busandaehak-ro 63beon-gil Geumjeong-gu Busan46241 Korea Republic of Fuel Cell Research Center Korea Institute of Science and Technology Hwarang-ro 14-gil 5 Seongbuk-gu Seoul02792 Korea Republic of Graduate Program of Energy Technology School of Integrated Technology Institute of Integrated Technology Gwangju Institute of Science and technology 123 Cheomdangwagi-ro Buk-gu Gwangju61005 Korea Republic of

A palladium-based (Pd-based) core@shell catalyst can be modified to achieve the desired oxygen adsorption properties by selecting an appropriate core composition, surface alloying, and compressive strain. Herein, we present the effects of compressive strain, core composition, and surface alloying in Pd3Ni@PdIr(111), Pd3CuNi@PdIr(111), and Pd3Cu@PdIr(111) alloy-core@alloy-shell catalysts on dioxygen adsorption. Using experimental lattice parameters for the unstrained catalysts,-1% to-5%, strain was systematically introduced. The calculated dioxygen-adsorption energies for the surface Pd and surface Ir atoms reveal that the Pd3CuNi@PdIr catalyst has the lowest dioxygen-adsorption energy at a given compressive strain. Bader charge calculations show that the Pd3CuNi@PdIr catalyst surface is the most charge depleted. The d-band model displays an intermediate d-band center downshift for the surface Pd atoms, and the highest downshift for the surface Ir atoms. Due to synergism between charge depletion, the d-band center shift, and the surface alloy effect, the Pd3CuNi@PdIr catalyst has the lowest dioxygen-adsorption energy. The relationship between the experimentally obtained catalyst-surface mass activity and the theoretically calculated d-band center of the surface Pd and the surface Ir is volcano shaped, with the Pd3CuNi@PdIr catalyst at the apex of the volcano. The catalytic activities of these catalysts were observed to follow the order: Pd3CuNi@PdIr >Pd3Cu@PdIr >Pd3Ni@PdIr. This work sheds light on the importance of ligand and strain effects, as well as surface alloying for the fine-tuning of alloy-core@alloy-shell-catalysts during the rational design of catalysts from first principles. Copyright © 2019, The Authors. All rights reserved.

关键词： Electronic structure

A LRET Nanoplatform Consisting of Lanthanide and Amorphous Manganese Oxide for NIR-II Luminescence Lifetime Imaging of Tumor Redox Status

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Angewandte Chemie 2022年第47期134卷

作者： Dr. Mengyao Zhao Dr. Hongjun Zhuang Dr. Hongxin Zhang Dr. Benhao Li Jiang Ming Prof. Xiaoyuan Chen Prof. Meiwan Chen State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical Sciences University of Macau Macau 999078 China Departments of Diagnostic Radiology Surgery Chemical and Biomolecular Engineering and Biomedical Engineering Yong Loo Lin School of Medicine and Faculty of Engineering National University of Singapore Singapore 119074 Singapore Contribution: Conceptualization (lead) Investigation (lead) Writing - original draft (lead) Department of Chemistry State Key Laboratory of Molecular Engineering of Polymers and iChem Shanghai Key Laboratory of Molecular Catalysis and Innovative Material Fudan University Shanghai 200433 China Contribution: Investigation (supporting) Nanomedicine Translational Research Program NUS Center for Nanomedicine Yong Loo Lin School of Medicine National University of Singapore Singapore 117597 Singapore Clinical Imaging Research Centre Centre for Translational Medicine Yong Loo Lin School of Medicine National University of Singapore Singapore 117599 Singapore Institute of Molecular and Cell Biology Agency for Science Technology and Research (A*STAR) Singapore 138673 Singapore Contribution: Funding acquisition (lead) Supervision (lead)

Designing luminescence lifetime sensors in the second near-infrared (NIR-II) window is a great challenge due to the difficult structural construction. Here, we report a tumor redox responsive and easily synthesized material, amorphous manganese oxide (MnO x ) with indirect band gap of 1.02 eV, as an energy acceptor to build a luminescence resonance energy transfer (LRET) toolbox for universally regulating NIR-I to NIR-II luminescence lifetimes of lanthanide nanoparticles, in which energy transfer is based on matched energy gap instead of conventional overlapped spectra. We further utilize ytterbium (Yb 3+ )-doped YbNP@MnO x as an NIR-II luminescence lifetime sensor to realize in vitro quantitative redox visualization with relative errors under 5 % in samples covered with mouse skin. Furthermore, HepG2 cells and tumors with high redox state have been accurately distinguished by NIR-II luminescence lifetime imaging. The quantified intracellular and intratumor glutathione (GSH) levels are highly consistent with the commercial kit results, illustrating the reliable redox visualization ability in biological tissue.

关键词： Amorphous Manganese Oxide Lanthanide Luminescence Lifetime Imaging NIR-II LRET Quantitative Redox Visualization

OPTIMADE, an API for exchanging materials data

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arXiv 2021年

作者： Andersen, Casper W. Armiento, Rickard Blokhin, Evgeny Conduit, Gareth J. Dwaraknath, Shyam Evans, Matthew L. Fekete, Ádám Gopakumar, Abhijith Gražulis, Saulius Merkys, Andrius Mohamed, Fawzi Oses, Corey Pizzi, Giovanni Rignanese, Gian-Marco Scheidgen, Markus Talirz, Leopold Toher, Cormac Winston, Donald Aversa, Rossella Choudhary, Kamal Colinet, Pauline Curtarolo, Stefano Di Stefano, Davide Draxl, Claudia Er, Suleyman Esters, Marco Fornari, Marco Giantomassi, Matteo Govoni, Marco Hautier, Geoffroy Hegde, Vinay Horton, Matthew K. Huck, Patrick Huhs, Georg Hummelshøj, Jens Kariryaa, Ankit Kozinsky, Boris Kumbhar, Snehal Liu, Mohan Marzari, Nicola Morris, Andrew J. Mostofi, Arash A. Persson, Kristin A. Petretto, Guido Purcell, Thomas Ricci, Francesco Rose, Frisco Scheffler, Matthias Speckhard, Daniel Uhrin, Martin Vaitkus, Antanas Villars, Pierre Waroquiers, David Wolverton, Chris Wu, Michael Yang, Xiaoyu École Polytechnique Fédérale de Lausanne Lausanne1015 Switzerland Materials Design and Informatics Unit Department of Physics Chemistry and Biology Linköping University Sweden Tilde Materials Informatics Straßmannstraße 25 Berlin10249 Germany Materials Platform for Data Science Sepapaja 6 Tallinn15551 Estonia Theory of Condensed Matter Group Cavendish Laboratory 19 J.J. Thomson Avenue CambridgeCB3 0HE United Kingdom Lawrence Berkeley Labs BerkeleyCA United States Chemin des Étoiles 8 Louvain-la-Neuve1348 Belgium Department of Physics King's College London London United Kingdom Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Institute of Biotechnology Life Science Center Vilnius University Saulétekio av. 7 VilniusLT-10257 Lithuania Institute of Computer Science Faculty of Mathematics and Informatics Vilnius University Naugarduko g. 24 VilniusLT-03225 Lithuania Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6 Berlin14195 Germany Center for Autonomous Materials Design Duke University DurhamNC27708 United States Department of Mechanical Engineering and Materials Science Duke University DurhamNC27708 United States Humboldt-Universität zu Berlin Institut für Physik and IRIS Adlershof Berlin12489 Germany École Polytechnique Fédérale de Lausanne Sion1951 Switzerland Trieste34136 Italy Hermann-von-Helmholtz-Platz 1 Eggenstein-Leopoldshafen76344 Germany Materials Measurement Laboratory National Institute of Standards and Technology GaithersburgMD20899 United States Ansys 300 Rustat House 62 Clifton Rd CambridgeCB1 7EG United Kingdom De Zaale 20 Eindhoven5612 AJ Netherlands Department of Physics and Science of Advanced Materials Program Central Michigan University Mount PleasantMI48859 United States Argonne National Laboratory LemontIL60439 United States Thayer School of Engineering Dartmouth College HanoverNH03755 United States Los AltosCA940

The Open Databases Integration for materials Design (OPTIMADE) consortium has designed a universal application programming interface (API) to make materials databases accessible and interoperable. We outline the first stable release of the specification, v1.0, which is already supported by many leading databases and several software packages. We illustrate the advantages of the OPTIMADE API through worked examples on each of the public materials databases that support the full API specification. © 2021, CC BY.

关键词： Specifications

Resolving spin, valley, and moiré quasi-angular momentum of interlayer excitons in WSe2/WS2 heterostructures

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arXiv 2019年

作者： Jin, Chenhao Regan, Emma C. Wang, Danqing Iqbal Bakti Utama, M. Yang, Chan-Shan Cain, Jeffrey Qin, Ying Shen, Yuxia Zheng, Zhiren Watanabe, Kenji Taniguchi, Takashi Tongay, Sefaattin Zettl, Alex Wang, Feng Department of Physics University of California at Berkeley BerkeleyCA94720 United States Graduate Group in Applied Science and Technology University of California at Berkeley BerkeleyCA94720 United States Department of Materials Science and Engineering University of California at Berkeley BerkeleyCA94720 United States Institute of Electro-Optical Science and Technology Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei11677 Taiwan Material Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Kavli Energy NanoSciences Institute University of California Berkeley Lawrence Berkeley National Laboratory BerkeleyCA94720 United States School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85287 United States National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan

Moiré superlattices provide a powerful way to engineer properties of electrons and excitons in two-dimensional van der Waals heterostructures1-11. The moiré effect can be especially strong for interlayer excitons, where electrons and holes reside in different layers and can be addressed separately. In particular, it was recently proposed that the moiré superlattice potential not only localizes interlayer exciton states at different superlattice positions, but also hosts an emerging moiré quasi-angular momentum (QAM) that periodically switches the optical selection rules for interlayer excitons at different moiré sites12,13. Here we report the observation of multiple interlayer exciton states coexisting in a WSe2/WS2 moiré superlattice and unambiguously determine their spin, valley, and moiré QAM through novel resonant optical pump-probe spectroscopy and photoluminescence excitation spectroscopy. We demonstrate that interlayer excitons localized at different moiré sites can exhibit opposite optical selection rules due to the spatially-varying moiré QAM. Our observation reveals new opportunities to engineer interlayer exciton states and valley physics with moiré superlattices for optoelectronic and valleytronic applications. Copyright © 2019, The Authors. All rights reserved.

关键词： Angular momentum

Synthesis of glycerol carbonate from transesterification of glycerol with dimethyl carbonate catalyzed by CaO from natural sources as green and economical catalyst

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materials Today: Proceedings 2018年第6期5卷 13909-13915页

作者： Wuttichai Roschat Sunti Phewphong Teadkait Kaewpuang Vinich Promarak School of Chemistry Institute of Science Suranaree University of Technology Nakhon Ratchasima 30000 Thailand Program of Chemistry Faculty of Science and Technology Sakon Nakhon Rajabhat University Sakon Nakhon 47000 Thailand Center of Excellence on Alternative Energy Sakon Nakhon Rajabhat University Sakon Nakhon 47000 Thailand Department of Material Science and Engineering Vidyasirimedhi Institute of Science and Technology 21210 Thailand

CaO catalysts derived from natural sources were investigated in the transesterification of dimethyl carbonate with glycerol to produce glycerol carbonate. The obtained CaO catalysts were characterized by several techniques, namely TG-DTA, XRD, XRF, BET surface area, SEM, FT-IR, CO 2 -TPD, and Hammett indicator test. The transesterification was simply monitored and analyzed by NMR technique. Under the optimized reaction conditions of dimethyl carbonate to glycerol molar ratio of 3:1, catalyst loading amount of 3 wt.% and reaction temperature of 80 °C; over 92.1% yield of glycerol carbonate product could be achieved within 2 h.

关键词： Glycerol carbonate CaO Heterogeneous catalyst Transesterification NMR analysis

Heavy anionic complex creates a unique water structure at a soft charged interface

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arXiv 2018年

作者： Rock, William Qiao, Baofu Zhou, Tiecheng Clark, Aurora E. Uysal, Ahmet Argonne National Laboratory Chemical Sciences and Engineering Division United States ArgonneIL60439 United States Department of Chemistry and Material Science and Engineering Program United States Washington State University PullmanWA99164 United States

Ion hydration and interfacial water play crucial roles in numerous phenomena ranging from biological to industrial systems. Although biologically relevant (and mostly smaller) ions have been studied extensively in this context, very little experimental data exist about molecular scale behavior of heavy ions and their complexes at interfaces, especially under technologically significant conditions. It has recently been shown that PtCl62-complexes adsorb at positively charged interfaces in a two-step process that cannot fit into well-known empirical trends, such as Hofmeister series. Here, a combined vibrational sum frequency generation and molecular dynamics study reveals that a unique interfacial water structure is connected to this peculiar adsorption behavior. A novel sub-ensemble analysis of MD simulation results show that after adsorption, PtCl62-complexes partially retain their first and second hydration spheres, and it is possible to identify three different types of water molecules around them based on their orientational structures and hydrogen bonding strengths. These results have important implications for relating interfacial water structure and hydration enthalpy to the general understanding of specific ion effects. This in turn influences interpretation of heavy metal ion distribution across and reactivity within, liquid interfaces. Copyright © 2018, The Authors. All rights reserved.

关键词： Molecules

Identification of Magnetite material (Fe3O4) Based on Natural materials as Catalyst for Industrial Raw material Application

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Journal of Physics: Conference Series 2019年第1期1232卷

作者： Maulinda Ikramullah Zein Zulkarnain Jalil Industrial Engineering Study Program Engineering Faculty of serambi Mekkah University Banda Aceh Indonesia Material Physics Laboratory Department of Physics Faculty of Mathematics and Natural Science SyiahKuala University Banda Aceh Indonesia

Identification of magnetite nanoparticles synthesized from natural iron sand with a chemical treatment that is by using thecoprecipitation method on temperature and heated spaces, using a pair of acids and bases, i.e. HCL as a solvent NH4OH and as its precipation. The Crystal structure, the percentage of elements, the particle size and properties of the magnetism material characterization by XRD, XRF identification testing, and permagraph. From the results obtained in the Analysis that the value of the percentage purity of Fe3O4 are derived from Natural Sands before Extraction is of 81.42%, and once on extract 86.73% increase to its purity. From the results of the analysis of properties of ferrite magnet to Fe3O4from sand iron retrieved the value of Saturation Magnetization (Ms) produced amounted to 0.29 T, or residual magnetization Remanence (Br) of 0081 T, and Coercivityy(Hc) amounted to 1.82 kA/m expected data analysis results may explain the comparison characteristics in structure and magnetic properties of material with a natural sand Fe3O4 Aldrich so it can be an additional related information value added (added value) the local SDA.

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