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Comparative study on the ionic conductivities and redox properties of LiPF6 and LiTFSI electrolytes and the characteristics of their rechargeable lithium ion batteries 1

Comparative study on the ionic conductivities and redox prop...

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1st materials Research Society-Indonesia Conference and Congress 2017, MRS-INA C and C 2017

作者： Septiana, A.R. Honggowiranto, W. Sudaryanto, S. Kartini, E. Hidayat, R. Physics Program Study Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jl. Ganesha 10 West-Java40132 Indonesia Center for Science and Technology of Advanced Material National Nuclear Energy Agency of Indonesia Kawasan PUSPIPTEK Serpong Tangerang Selatan Banten15314 Indonesia

The ionic conductivities of two different electrolytes, namely lithium hexafluorophosphate (LiPF6) and lithium bis (trifluoromethylsulfonyl) imide (LiTFSI), in carbonate-based solvents have been investigated. The ionic conductivity of LiTFSI electrolyte is slightly larger than the LiPF6 electrolyte, namely 2.7 mS/cm vs. 2.4 mS/cm. The results of cyclic voltammetry and electrochemical impedance spectroscopy measurements show that LiTFSI electrolyte exhibit a better reversible redox reaction. Therefore, in this work, the full-cell battery using LiTFSI electrolyte exhibited higher specific capacity than the battery cell using LiPF6 electrolyte, namely 83.1 mAh/g and 101.5 mAh/g for the LiPF6 and LiTFSI electrolytes, respectively. Higher capacity in LiTFSI battery is thus related to better ionic conductivity and reversible redox reaction of LiTFSI electrolyte. © Published under licence by IOP Publishing Ltd.

关键词： Electrolytes

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Strength improvement of linerboard by wet-end application of sludge and black liquor

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2018年第4期50卷 141-148页

作者： Choi, Kyoung-Hwa Lee, Jae-Hun Cho, Byoung-Uk Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Chunchon Korea Republic of Changgang Institute of Paper Science and Technology Kangwon National University Chunchon Korea Republic of

In this study, effects of the wet-end addition of sludge and black liquor on strength properties of linerboard were investigated. Handsheets were prepared with old corrugated container (OCC) stock received from a linerboard mill and various dosages of sludge and black liquor based on dry pulp weight were added to the OCC stock with flocculants. Strength of OCC handsheet was initially increased with the addition of sludge without flocculants and black liquor and then passed through a maximum at 10% sludge addition. Without sludge, addition of flocculants into the OCC stock improved paper strength. However, paper strength was significantly decreased with sludge addition and the use of flocculants could not improved the decreased paper strength. Addition of black liquor to sludge with flocculants improved paper strength, especially folding strength and compressive strength. Conclusively, a certain amount of paper mill sludge could be utilized for production of linerboard and the decreased paper strength with addition of sludge could be recovered by the addition of black liquor and flocculants. © 2015 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Compressive strength

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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

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Studies on seasonal variation of linerboard strength (III) - Effect of pulping consistency of OCC on strength of linerboard

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2018年第4期50卷 40-46页

作者： Lee, Kwang-Seob Choi, Kyoung-Hwa Won, Heon-Seong Choi, Seong-Keong Choi, Ji-Su Ryu, Jeong-Yong Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Chunchon Korea Republic of Chaggang Institute of Paper Science and Technology Kangwon National University Chuncheon24341 Korea Republic of

The strength of linerboards produced in summer was weaker than that in winter. In this study, efforts were made to increase the consistency of OCC pulp to improve the strength of linerboards produced in the summer. The pulping temperatures of summer and winter were set at 52°C and 19°C, respectively. The pulping consistency was set 5% at 19°C in winter and 5, 6, 6.5 and 7% at 52°C in summer. As a result, it has been found that the strength of the linerboard can be improved by increasing the pulping consistency. The strength of the linerboard with a pulping consistency of 6% and a pulping temperature of 52°C is similar to that of 5% and 19°C. The linerboard strength increased by more than 20% when the consistency increased to 6.5 and 7%. Therefore, an increase in pulp consistency is considered to be one of the solutions to improve the strength of linerboards in summer. © 2015 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Pulp

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Efficiency of hydrophobization of PVA coating layer gas-grafted with palmitoyl chloride

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2018年第4期50卷 123-134页

作者： Lee, Kwang-Seob Lee, Jae-Hun Lee, Myoung-Ku Ryu, Jeong-Yong Changgang Institute of Paper Science and Technology Kangwon National University Chuncheon24341 Korea Republic of Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Chunchon Korea Republic of

Gas grafting of cellulose with fatty acid chloride based on chromatogenic chemistry is an effective method which can provide paper with hydrophobic characteristic. In case of gas grafting with fatty acid chloride, various reaction parameters such as concentration of fatty acid chloride, reaction temperature, and reaction time are very important for the optimization of the gas grafting of cellulose. In this study the gas grafting efficiency of PVA (polyvinyl alcohol) coated paper at the various conditions was evaluated by measuring water resistance such as Cobb1,800 size and water contact angle. Also quantitative analysis was performed for determining reacted or un reacted fatty acid chloride by using ATR spectroscopy and GC. As a result, when the content of palmitoyl chloride esterified with a hydroxyl group at 1% concentration of palmitoyl chloride and 1801°C of react temperature was less than 1 g/m2, Cobb1,800 size degree was less than 10 g/m2. And it was found that Cobb1,800 size value, water contact angle, ratios of absorption peak of 1,735 cm-1/3,300 cm-1, amount of grafted fatty acid was improved with increase in concentration of palmitoyl chloride, temperature, and reaction time. And there was good correlation between GC analysis, ATR spectroscopy analysis and Cobbi,8oo sizing degree for evaluation of the grafting efficiency. It should be noted that only water contact angle could not be used to evaluate the grafting efficiency. © 2015 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Gases

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Analysis of modern document paper for identification of counterfeit document (I) - Filler composition - Filler c

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2018年第3期50卷 28-35页

作者： Choi, Kyoung-Hwa Lee, Jae-Hoon Ryu, Jeong-Yong Changgang Institute of Paper Science and Technology Kangwon National University Chun-cheon24341 Korea Republic of Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Chuncheon24341 Korea Republic of

In this study, the composition and content of filler within the 188 species of split sheets of a graduate thesis, whose publication year was verified, were analyzed to investigate the characteristics of modern document paper. Based on the results of ash-measurements and SEM-EDS analysis, it was found that major fillers, including talc, clay and calcium carbonate, are used in modern paper making. Between 1978 and 2000, talc was used as a major filler in document paper. Since around 2000, calcium carbonate was begun to be used, and calcium carbonate was mainly used in recent years. It is closely related with not only the use of calcium carbonate due to a conversion into neutral paper-making system in 1985 but also the decline of price due to a increase of domestic production of calcium carbonate in 1999. The ash content of the paper samples varied from about 10% to 30%. Several samples are assumed to contain fillers and coating pigments. To increase the reliability of analysis data, we need to continually sample and investigate more diverse documents. © 2018 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Calcium carbonate

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Activatable NIR-II Photothermal Lipid Nanoparticles for Improved Messenger RNA Delivery

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Angewandte Chemie 2023年第25期135卷

作者： Dr. Benhao Li Dr. Mengyao Zhao Weiping Lai Dr. Xuanbo Zhang Bowei Yang Prof. Xiaoyuan Chen Prof. Qianqian Ni 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 Nanomedicine Translational Research Program NUS Centre for Nanomedicine Yong Loo Lin School of Medicine National University of Singapore Singapore 117597 Singapore Contribution: Investigation (lead) Writing - original draft (lead) Contribution: Investigation (supporting) 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 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 (equal) Supervision (equal) Writing - review & editing (equal)

Endosomal escape remains a central issue limiting the high protein expression of mRNA therapeutics. Here, we present second near-infrared (NIR-II) lipid nanoparticles (LNPs) containing pH activatable NIR-II dye conjugated lipid (Cy-lipid) for potentiating mRNA delivery efficiency via a s timulus-responsive p hotothermal-promoted e ndosomal e scape d elivery (SPEED) strategy. In acidic endosomal microenvironment, Cy-lipid is protonated and turns on NIR-II absorption for light-to-heat transduction mediated by 1064 nm laser irradiation. Then, the heat-promoted LNPs morphology change triggers rapid escape of NIR-II LNPs from the endosome, allowing about 3-fold enhancement of enhanced green fluorescent protein (eGFP) encoding mRNA translation capacity compared to the NIR-II light free group. In addition, the bioluminescence intensity induced by delivered luciferase encoding mRNA in the mouse liver region shows positive correlation with incremental radiation dose, indicating the validity of the SPEED strategy.

关键词： Endosomal Escape Lipid Nanoparticle Photothermal Effect Second Near-Infrared Window

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Magnetic Control of Soft Chiral Phonons in PbTe

arXiv

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arXiv 2021年

作者： Baydin, Andrey Hernandez, Felix G.G. Rodriguez-Vega, Martin Okazaki, Anderson K. Tay, Fuyang Timothy Noe, G. Katayama, Ikufumi Takeda, Jun Nojiri, Hiroyuki Rappl, Paulo H.O. Abramof, Eduardo Fiete, Gregory A. Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Instituto de Física Universidade de São Paulo SP São Paulo05508-090 Brazil Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais SP São José dos Campos12201-970 Brazil Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama240-8501 Japan Institute for Materials Research Tohoku University Sendai980-8577 Japan Department of Physics Northeastern University BostonMA02115 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

PbTe crystals have a soft transverse optical phonon mode in the terahertz frequency range, which is known to efficiently decay into heat-carrying acoustic phonons, resulting in anomalously low thermal conductivity. Here, we studied this phonon via polarization-dependent terahertz spectroscopy. We observed softening of this mode with decreasing temperature, indicative of incipient ferroelectricity, which we explain through a model including strong anharmonicity with a quartic displacement term. In magnetic fields up to 25 T, the phonon mode splits into two modes with opposite handedness, exhibiting circular dichroism. Their frequencies display Zeeman splitting together with an overall diamagnetic shift with increasing magnetic field. Using a group-theoretical approach, we demonstrate that these observations are the result of magnetic field-induced morphic changes in the crystal symmetries through the Lorentz force exerted on the lattice ions. Thus, our study reveals a novel process of controlling phonon properties in a soft ionic lattice by a strong magnetic field. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnetic fields

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Erratum: Extended Drude Model for Intraband-Transition-Induced Optical Nonlinearity [Phys. Rev. Applied 11, 064062 (2019)]

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Physical Review Applied 2020年第3期14卷 039901-039901页

作者： Heng Wang Kang Du Chuhao Jiang Zhiqiang Yang Lixia Ren Wending Zhang Soo Jin Chua Ting Mei MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and Technology Northwestern Polytechnical University Xi’an 710129 China Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117583 LEES Program Singapore-MIT Alliance for Research & Technology (SMART) 1 CREATE Way #10-01 CREATE Tower Singapore 138602

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Revealing the Side-Chain-Dependent Ordering Transition of Highly Crystalline Double-Cable Conjugated Polymers

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Angewandte Chemie 2021年第48期133卷

作者： Guitao Feng Wenliang Tan Safakath Karuthedath Cheng Li Xuechen Jiao Amelia C. Y. Liu Hariprasad Venugopal Zheng Tang Long Ye Frédéric Laquai Christopher R. McNeill Weiwei Li Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing 100029 China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China Department of Materials Science and Engineering Monash University Wellington Road Clayton Victoria 3800 Australia King Abdullah University of Science and Technology (KAUST) KAUST Solar Center (KSC) Physical Sciences and Engineering Division (PSE) Material Science and Engineering Program (MSE) Thuwal 23955-6900 Kingdom of Saudi Arabia School of Physics and Astronomy Monash University Wellington Road Clayton Victoria 3800 Australia Ramaciotti Centre for Cryo-Electron Microscopy Monash University Clayton Victoria 3800 Australia Center for Advanced Low-dimension Materials College of Materials Science and Engineering Donghua University Shanghai 201620 P. R. China School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic Science Tianjin University Tianjin 300350 P. R. China

We developed a series of highly crystalline double-cable conjugated polymers for application in single-component organic solar cells (SCOSCs). These polymers contain conjugated backbones as electron donor and pendant perylene bisimide units (PBIs) as electron acceptor. PBIs are connected to the backbone via alkyl units varying from hexyl (C 6 H 12 ) to eicosyl (C 20 H 40 ) as flexible linkers. For double-cable polymers with short linkers, the PBIs tend to stack in a head-to-head fashion, resulting in large d -spacings (e.g. 64 Å for the polymer P12 with C 12 H 24 linker) along the lamellar stacking direction. When the length of the linker groups is longer than a certain length, the PBIs instead adopt a more ordered packing likely via H -aggregation, resulting in short d -spacings (e.g. 50 Å for the polymer P16 with C 16 H 32 linker). This work highlights the importance of linker length on the molecular packing of the acceptor units and the influences on the photovoltaic performance of SCOSCs.

关键词： cryo-transmission electron microscopy double-cable conjugated polymers lamellar stacking single-component organic solar cells

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