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Synthesis of a Kind of Temperature-responsive Cell Culture Surface for Corneal Sheet

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Journal of materials Science & Technology 2010年第12期26卷 1119-1126页

作者： Yanqing Guan Zhibin Li Xin Wang Xiaoli Ni Aini Yang Junming Liu School of Life Science South China Normal University Guangzhou 510631 China School of Physics South China Normal University Guangzhou 510631 China laboratory of solid state Microstructures Nanjing University Nanjing 210093 China International center for materials Physics Chinese Academy of Sciences Shenyang 110016 China

In this study, acrylic acid （AA） and 4-azidoaniline were used to modify poly （N-isopropylacrylamide）（NIPAAm） in order to fabricate temperature-responsive surface for corneal epithelia cell adhesion and detachment. First, NIPAAm was copolymerized with acrylic acid. Then, the copolymer was coupled with azidoaniline to synthesize AzPhPIA, derivative of p（NIPAAm-co-AA）, which possesses both thermo- and photo-sensitivities. Second, the synthesized copolymer was characterized by high performance liquid chromatography （HPLC）, Fourier transform infrared （FTIR） and a CHN analyzer. The thermo-sensitivity was characterized by temperature reducing experiment, contact angle measurement and low critical solution temperature （LCST） testing. Third, the derivatized copolymer was immobilized by photolithography on a polystyrene plate, and then the surface characterization of AzPhPIA-coated polystyrene plate （PSt） was measured by electron spectroscopy for chemical analysis （ESCA）. The thermo-sensitivity and cytocompatibility of the AzPhPIA-coated PSt were investigated by corneal epithelial cells culture. The results revealed that the AzPhPIA-coated PSt exhibited good cytocompatibility and cell detachability when temperature decreased.

关键词： N-isopropylacrylamide Low critical solution temperature Tissue engineering Corneal epithelial cells

Thermal pyrolysis conversion of methane to hydrogen(H_(2)):A review on process parameters,reaction kinetics and techno-economic analysis

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Chinese Chemical Letters 2024年第8期35卷 62-73页

作者： Yi Herng Chan Zhe Phak Chan Serene Sow Mun Lock Chung Loong Yiin Shin Ying Foong Mee Kee Wong Muhammad Anwar Ishak Ven Chian Quek Shengbo Ge Su Shiung Lam PETRONAS Research Sdn.Bhd.(PRSB) Kawasan Institusi BangiLot 3288&3289Off Jalan Ayer ItamKajang 43000Malaysia PETRONAS Carbon Capture&Storage(CCS)Enterprise PETRONAS Twin TowersKuala Lumpur City CentreKuala Lumpur 50088Malaysia CO_(2)Research center(CO2RES) Department of Chemical EngineeringUniversiti Teknologi PETRONASSeri Iskandar 32610Malaysia Department of Chemical Engineering and Energy Sustainability Faculty of EngineeringUniversiti Malaysia Sarawak(UNIMAS)Kota Samarahan 94300Malaysia Institute of Sustainable and Renewable Energy(ISuRE) Universiti Malaysia Sarawak(UNIMAS)Kota Samarahan 94300Malaysia Higher Institution Centre of Excellence(HICoE) Institute of Tropical Aquaculture and Fisheries(AKUATROP)Universiti Malaysia TerengganuKuala Nerus 21030Malaysia Co-Innovation center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China center for Global Health Research(CGHR) Saveetha Medical CollegeSaveetha Institute of Medical and Technical Sciences(SIMATS)Saveetha UniversityChennai 602105India

Hydrogen(H_(2))is a promising renewable energy which finds wide applications as the world gears toward low-carbon ***,current H_(2) production via steam methane reforming of natural gas or gasification of coal are laden with high CO_(2) ***,methane(CH_(4))pyrolysis has emerged as a potential technology to generate low-carbon H_(2) and solid *** this review,the current state-of-art and recent progress of H_(2) production from CH_(4) pyrolysis are reviewed in *** such as funda-mental mechanism and chemistry involved,effect of process parameters on the conversion efficiency and reaction kinetics for various reaction media and catalysts are elucidated and critically ***-ature,among other factors,plays the most critical influence on the methane pyrolysis *** metal/salt could lower the operating temperature of methane pyrolysis to1000℃.Based on the reaction kinetics,metal-based cata-lysts were more efficient in lowering the activation energy of the reaction to 29.5-88 kJ/mol from that of uncatalyzed reaction(147-420.7 kJ/mol).Besides,the current techno-economic performance of the pro-cess reveals that the levelized cost of H_(2) is directly influenced by the sales price of carbon(by-product)generated,which could offset the overall ***,the main challenges of reactor design for efficient product separation and retrieval,as well as catalyst deactivation/poisoning need to be debottlenecked.

关键词： Pyrolysis Methane Hydrogen Reaction kinetics Techno-economic analysis

Semi-empirical estimation for enhancing negative thermal expansion in PbTiO_(3)-based perovskites

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International Journal of Minerals,Metallurgy and materials 2022年第4期29卷 783-786页

作者： Tao Yang Longlong Fan Yilin Wang Kun Lin Jun Chen Xianran Xing Beijing Advanced Innovation center for materials Genome Engineering Institute of Solid State ChemistryDepartment of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China College of Physics and materials Science Tianjin Normal UniversityTianjin 300387China Institute of Advanced materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjing 211816China

Generally,most materials expand when heated and contract when cooled,whereas negative thermal expansion(NTE)materials are very *** a typical NTE material,PbTiO_(3) and related compounds have drawn particular interest in recent *** discovery of an enhanced NTE system in PbTiO_(3) is beneficial to deepen our understanding of its mechanism and regulate its *** present,the method of discriminating an enhanced NTE material based on PbTiO_(3) is not ***,we propose a semi-empirical method through evaluating the average lattice distortion in related systems to estimate the relative coefficient of thermal expansion *** rationality of the method was verified by the analysis of the 0.6PbTiO_(3)-0.4Bi(Ga_(x)Fe_(1-x))O_(3) *** far,all PbTiO_(3)-based compounds with enhanced NTE conform well to this *** method provides the possibility to find more enhanced NTE PbTiO_(3)-based materials.

关键词： enhanced negative thermal expansion crystal structure lead titanate spontaneous polarization

analysis of Quasielastic Light Scattering in Ferroelectric Liquid Crystal

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Chinese Physics Letters 1994年第9期11卷 585-588页

作者： ZHANG Ping YIN Zhen ZHANG Mingsheng HUANG Qiang Department of Physics Nanjing UniversityNanjing 210008 center for materials analysis and National laboratory of solid-state Microstructures Nanjing UniversityNanjing 210008 center for Computation Nanjing UniversityNanjing 210008

Temperature dependence of Raman spectra of ferroelectric liquid crystal MBOPDOB is examined in spectral region 0-30cm-1 with spectral emphasis on the quasielastic light scattering near solid-Sm C**** quasielastic components are well fitted to Debye-type susceptibility *** increase of temperature the inverse of the relaxation time T linearly goes to zero in the temperature range below the transition,manifesting a critical *** relaxation time keeps same big value in the Sm C*phase as that at the transition point owing to long orientational relaxation in the liquid phase.

关键词： transition. relaxation elastic

Thermodynamic and Kinetic analysis of Low-temperature Thermal Reduction of Graphene Oxide

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Nano-Micro Letters 2011年第1期3卷 51-55页

作者： Kuibo Yin Haitao Li Yidong Xia Hengchang Bi Jun Sun Zhiguo Liu Litao Sun SEU-FEI Nano-Pico center Key Laboratory of MEMS of Ministry of Education Southeast University Department of materials Science and Engineering National Lab of Solid State Microstructure Nanjing University

The thermodynamic state and kinetic process of low-temperature deoxygenation reaction of graphene oxide(GO) have been investigated for better understanding on the reduction mechanism by using Differential Scanning Calorimetry(DSC), Thermogravimetry-Mass Spectrometry(TG-MS), and X-ray Photoelectron Spectroscopy(XPS). It is found that the thermal reduction reaction of GO is exothermic with degassing of CO_2, CO and H_2O. Graphene is thermodynamically more stable than GO. The deoxygenation reaction of GO is kinetically controlled and the activation energy for GO is calculated to be 167 k J/mol(1.73 e V/atom).

关键词： Graphene oxide Activation energy Thermal deoxygenation

Light Scattering in Crystal Lithium Sodium Sulphate Near Phase Transitions

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Progress in Natural Science:materials International 1994年第1期 115-118页

作者：张明生尹真 center far materials analysis & state laboratory of solid state Microstructures. nanjing university Department of Physics. nanjing university Nainjing 210008 nanjing 210008 PRC

Lithium sodium sulphate LiNaSO4is a binary-cation sulphate with a hexagonal structure at room *** room-temperature symmetry of LiNaSO4belongs to space group P31C (C3v~4) with six molecules per unit cell. Lithium potassium sulphate LiKSO4is also a binary-cation sulphate with the same Li ions as the cations However. there are great differences between the high-temperature behaviors of these two *** measurements of X-ray diffraction by Li and Raman spectroscopy by Zhang et al. have found that there are an incommensurate and superlattice phases in the high

关键词： lithium sodium sulphate phase transition light scattering

Tuning dual-atom mediator toward high-rate bidirectional polysulfide conversion in Li-S batteries

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Journal of Energy Chemistry 2023年第12期87卷 462-472,I0012页

作者： Yifan Ding Zhongti Sun Jianghua Wu Tianran Yan Lin Shen Zixiong Shi Yuhan Wu Xiaoqing Pan Liang Zhang Qiang Zhang Jingyu Sun College of Energy Soochow Institute for Energy and Materials InnovationsKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006JiangsuChina School of materials Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina National laboratory of solid-state Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina Institute of Functional Nano&Soft materials Jiangsu Provincial Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215006JiangsuChina Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

An emerging practice in the realm of Li-S batteries lies in the employment of single-atom catalysts(SACs)as effective mediators to promote polysulfide conversion,but monometallic SACs affording isolated geometric dispersion and sole electronic configuration limit the catalytic benefits and curtail the cell ***,we propose a class of dual-atom catalytic moieties comprising hetero-or homo-atomic pairs anchored on N-doped graphene(NG)to unlock the liquid–solid redox puzzle of sulfur,readily realizing Li-S full cell under high-rate-charging *** for Fe-Ni-NG,in-depth experimental and theoretical analysis reveal that the hetero-atomic orbital coupling leads to altered energy levels,unique electronic structures,and varied Fe oxidation states in comparison with homo-atomic structures(FeFe-NG or Ni-Ni-NG).This would weaken the bonding energy of polysulfide intermediates and thus enable facile electrochemical kinetics to gain rapid liquid-solid Li_(2)S_(4)?Li_(2)S ***,a Li-S battery based on the S@Fe-Ni-NG cathode demonstrates unprecedented fast-charging capability,documenting impressive rate performance(542.7 mA h g^(-1)at 10.0 C)and favorable cyclic stability(a capacity decay of 0.016%per cycle over 3000 cycles at 10.0 C).This finding offers insights to the rational design and application of dual-atom mediators for Li-S batteries.

关键词： Li-S batteries Reaction kinetics Dual-atom Rate-determining step High-rate performance

Electron-phonon coupling-assisted universal red luminescence of o-phenylenediamine-based carbon dots

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Light(Science & Applications) 2022年第7期11卷 1501-1514页

作者： Boyang Wang Zhihong Wei Laizhi Sui Jingkun Yu Baowei Zhang Xiaoyong Wang Shengnan Feng Haoqiang Song Xue Yong Yuxi Tian Bai Yang Siyu Lu Green Catalysis center and College of ChemistryZhengzhou University450000 ZhengzhouChina Key laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringJiangsu Key Laboratory of Vehicle Emissions ControlNanjing University210023 NanjingChina state Key Lab of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Sciences116023 DalianChina Nanochemistry Department Istituto Italiano di Tecnologia(IIT)via Morego 3016163 GenovaItaly School of Physics National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresNanjing University210093 NanjingChina Department of Chemistry University of SheffieldSheffield S37HFUK state Key Lab of Supramolecular Structure and materials College of ChemistryJilin University130012 ChangchunChina

Due to the complex core-shell structure and variety of surface functional groups,the photoluminescence(PL)mechanism of carbon dots(CDs)remain unclear.o-Phenylenediamine(oPD),as one of the most common precursors for preparing red emissive CDs,has been extensively ***,most of the red emission CDs based on oPD have similar PL emission ***,we prepared six different oPD-based CDs and found that they had almost the same PL emission and absorption spectra after *** and spectral characterization indicated that they had similar carbon core structures but diffferent surface polymer ***,single-molecule PL spectroscopy confirmed that the multi-modal emission of those CDs originated from the transitions of different vibrational energy levels of the same PL center in the carbon *** addition,the phenomenon of"spectral splitting"of single-particle CDs was observed at low temperature,which confirmed these oPD-based CDs were unique materials with properties of both organic molecules and quantum ***,theoretical calculations revealed their potential polymerization mode and carbon core ***,we proposed the PL mechanism of red-emitting CDs based on oPD precursors;that is,the carbon core regulates the PL emission,and the polymer shell regulates the PL *** work resolves the controversy on the PL mechanism of oPD-based red *** findings provide a general guide for the mechanism exploration and structural analysis of other types of CDs.

关键词： structure. carbon luminescence

solid-state nanopores for ion and small molecule analysis

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Chinese Chemical Letters 2019年第9期30卷 1607-1617页

作者： Qi Zhang Yue Cheng Peisheng Cao Zhiyuan Gu Jiangsu Key laboratory of Biofunctional materials Jiangsu Collaborative Innovation Center of Biomedical Functional Materials College of Chemistry and Materials Science Nanjing Normal University

solid-state nanopore in analytical chemistry has developed rapidly in the 1990s and it is proved to be a versatile new tool for bioanalytical chemistry. The research field of solid-state nanopore starts from mimicking the biological nanopore in living cells. Understanding the transport mechanism of biological nanopore in vivo is a big challenge because of the experimental difficulty, so it is essential to establish the basic research of artificial nanopores in vitro especially for the analysis of ions and small molecules. The performance of solid-state nanopores could be evaluated by monitoring currents when ions and molecules passed through. The comparison of the two types of nanopores based on current-derived information can reveal the principle of biological nanopores, while the solid-state nanopores are applied into practical bioanalysis. In this review, we focus on the researches of the solid-state nanopores in the fabrication process and in the analysis of ions and small molecules. Fabrication methods of nanopores,ion transport mechanism, small molecule analysis and theoretical studies are discussed in detail.

关键词： solid-state nanopores Single nanopore Ion Small molecule Nonlinear current-voltage curves Ionic current rectification