检索结果-南通市图书馆

Adsorption behavior of hexadecyltrimethylammonium bromide (CTAB) to mica substrates as observed by atomic force microscopy

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2005年第2期48卷 101-106页

作者： zhao Feng1.2. DU Yukou1. YANG Ping1. {1. Xingchang2.& TANG Ji’an2.1. Chemistry and chemical {2. department, Suzhou university, Suzhou 2.1}006, China 2. Key {12. of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 1.0080, China Correspondence should be addressed to Tang Ji’an (email: jatang@***) 1. Chemistry and chemical {1. {2. Suzhou University 215006 Suzhou China 2. Key laboratory of Colloid and Interface Science Institute of Chemistry Chinese Academy of Sciences 100080 Beijing China

Atomic force microscopy is employed to study the adsorption behavior of CTAB to mica surfaces. Results show that conformational transitions from globular micelles→cylindrical micelles→flat films are observed in the process of the adsorption of CTAB to mica at twice the bulk critical concentration. However, in 0.5 cmc CTAB solution, the adsorbed CTAB molecules to mica form the layered film structures, and apparent conformational transitions do not appear. Meanwhile, the phenomena of the adsorption of CTAB to mica and the dissociation of mica sur- faces are periodically observed.

关键词： atomic force microscopy (AFM), micelle, behavior of adsorption, the dissociation of mica surfaces.

Photocatalytic Oxidation Kinetics of Thiophene with Nano-F^-/Fe^(3+)/TiO_2

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical {1. 2009年第4期11卷 48-52页

作者： li Fatang~1.Sun Zhimin~1.liu Ying~1.zhao Dishun~2.liu Ruihong~1.(1.College of Science,Hebei university of Science and {2.,Shijiazhuang 05001. 2.College of chemical and Pharmaceutical engineering,Hebei university of Science and {2.) College of Science Hebei University of Science and Technology Shijiazhuang 050018 China College of chemical and Pharmaceutical {1. Hebei University of Science and Technology China

Photocatalytic oxidation kinetics of thiophene in n-octane/water extraction system was studied with fluorine and ferric ion codoped nano-TiO_2.nano-F^-/Fe^(3+)/TiO_2. powders used as the *** of initial concentration of thiophene and additional dosage of F^-/Fe^(3+)/TiO_2.on the reaction rate constant and half-life were *** results showed that the appropriately added dosage of F^-/Fe^(3+)/TiO_2.was 0.1.g in the 1.0-mL reaction system and the photooxidative kinetics of thiophene in the presence of F^-/Fe^(3+)/TiO_2.catalyst was of first-order with a rate constant of 0.6508 h^(-1. and a half-life of 1.0651.*** desulfurization rate of thiophene was 98.1.in 5 h and the sulfur content could be reduced from 800 ppm to 1. *** reaction rate constant increased with a decreasing initial concentration of thiophene.

关键词： desulfurization thiophene nano-F^-/Fe^(3+)/TiO_2 photocatalytic oxidation kinetics

Structure and Pozzolanic Activity of Calcined Coal Gangue during the Process of Mechanical Activation

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan uni{1. of {2.(Materials Science) 2009年第2期24卷 326-329页

作者：郭伟 department of Material {1. Yancheng Institute of Technology Institute of Material Science and engineering Nanjing University of Technology

On the basis of analyzing coal gangue＇s chemical and mineral compositions, the structure change of coal gangue during the mechanical activation was investigated by XRD, FTIR, NMR, and the mechanical strength of the cement doped coal gangue with various specific surface area was tested. The experimental results indicate that, the lattice structure of metakao{1.n in coal gangue samples calcined at 700 ℃ disorganizes gradually and becomes disordered, and the lattice structure of α-quartz is distorted s{1.ghtly. The pozzolanic activity of the coal gangue increases obviously with its structural disorganization.

关键词： coal gangue mechanical activation structure NMR tetrahedron

Superhydrophilic nickel hydroxide ultrathin nanosheets enable high-performance asymmetric supercapacitors

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第1期43卷 138-147页

作者： Yi-Ran wang {1. Zhang Jian-Min Gu Xiao-Yu {2. Ran {2. Xing wang Tian-Hui Wu Jing wang Ji-Dong wang De-Song wang State Key laboratory of Metastable Materials Science and {1.(MMST) Hebei Key Laboratory of Applied ChemistryYanshan UniversityQinhuangdao 066004China department of Food and Pharmaceutical {1. Suihua UniversitySuihua 152000China School of chemical Science and {1. Tongji UniversityShanghai 200092China School of Sciences Hebei University of Science and TechnologyShijiazhuang 050018China

Superhydrophilic surfaces have been applied for supercapacitor;however,during energy storage reaction,how the wettability affects the process of electrochemical reaction specifically is still ***,we demonstrate superhydrophilic surface for promotion of electrochemical reactions by liquid affinity and further explain the mechanism,where the transition of the wettability state caused by the change in surface free energy is the main reason for the obvious increase in specific *** citric acid assistance strategy,an intrinsically hydrophobic Ni(OH)_(2.thick nanosheets(HNHTNs,1. nm)can be transitioned into superhydrophilic Ni(OH)_(2.ultrathin nanosheets(SNHUNs,6.8 nm),where the water contact angle was 0°and the surface free energy increased from 8.6to 65.8 mN·m^(-1.,implying *** with HNHTNs,the specific capacitance of SNHUNs is doubled:from 1.30 F·g^(-1.(HNHTNs)to 2.50 F·g^(-1.(2.·g^(-1.)and,even at 2. A·g^(-1.,from 833 F·g^(-1.(HNHTNs)to 1.70 F·g^(-1..The asymmetric capacitors assembled by SNHUNs and activated carbon show 52.44 Wh·kg^(-1.at 1.0W·kg^(-1.and excellent stability with~90%retention after5000 cycles(~80%retention after 9500 cycles).The promotion of electrochemical performances is ascribed to the change of surface wettability caused by surface free energy,which greatly increase affinity of electrode to the surrounding liquid environment to reduce the interface resistance and optimize the electron transport path.

关键词： Asymmetric supercapacitor Superhydrophilic interface Transition metal hydroxides Ultrathin nanosheets High specific capacitance

Rapid lithium-ion insertion/extraction and migration behavior of Na_(2.WO_(4)-encapsulated lithium-rich layered oxide cathode

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第8期43卷 3647-3660页

作者： Yu-Shen zhao Fan-Fan {1. Jian-Cang {1. Peng-fei {1. Ting-Feng Yi Jun-Hong Zhang School of Materials Science and engineering Northeastern UniversityShenyangShenyang 110819China Key laboratory of Dielectric and Electrolyte Functional Material Hebei Province School of Resources and MaterialsNortheastern University at QinhuangdaoQinhuangdao 066004China Shandong provincial Key {1. of {2. Energy Storage and Novel Cell technology College of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China

Due to the low cost,high working voltage and high storage capacity,li-rich Mn-based layered compounds show promise as the cathode materials for lithiumion batteries(liBs).However,the side reactions at the solid-liquid interface of the cathode will lead to rapid capacity decay and inferior rate ***,this article proposes a liquid-phase dispersion strategy to introduce a Na_(2.WO_(4)layer on the li_(1.2.Ni_(0.1.)-Co_(0.1.)Mn_(0.54)O_(2. cathode,which can reduce the side effects between raw materials and electrolyte and promote the insertion/extraction rate of li^(+),thus enhancing the material stability and rate *** a result,the capacity retention rate is 96.9%after 2.0 cycles under ***,the capacities are 1.7.5,1.9.5,1.1.1.and58.3 mAh·g^(-1.at 1.,2.,5C and 1.C,implying a superior fast charging *** exceptional performance can be ascribed to both the increased conductivity and enhanced structural stability of the cathode ***'s more,based on the investigation of ion insertion/extraction behavior in electrode materials and the ion migration kinetics in the electrolyte,this study suggests that coating li-rich Mn-based materials with Na_(2.WO_(4)can be a promising strategy to improve their performance in liBs.

关键词： li-ion battery Coating Rate performance li_(1.2.Ni_(0.1.)Co_(0.1.)Mn_(0.54)O_(2. Reaction kinetics

WRKY33 negatively regulates anthocyanin biosynthesis and cooperates with PHR1.to mediate acclimation to phosphate starvation

在线全文

学校读者我要写书评

暂无评论

Plant Communications 2024年第5期5卷 134-147页

作者： Han Tao fei Gao {1.nying {1. Yuqing He Xueying Zhang Mengyu wang Jia Wei Yao zhao Chi Zhang Qiaomei wang Gaojie Hong State Key laboratory for Managing Biotic and {1. Threats to the Qua{2.ty and Safety of Agro-products Key Laboratory of Biotechnology in Plant Protection of the MOA of China and Zhejiang ProvinceInstitute of Virology and BiotechnologyZhejiang Academy of Agricultural SciencesHangzhou 310021China State Key laboratory of Subtropical Silviculture Zhejiang Provincial Key Laboratory of Resources Protection and Innovation of Traditional Chinese MedicineZhejiang A&F UniversityHangzhou 311300China department of Horticulture College of Agriculture and BiotechnologyZhejiang UniversityKey Laboratory of Horticultural Plant GrowthDevelopment and Quality ImprovementMinistry of AgricultureHangzhouZhejiangChina Institute of Sericulture and Tea Zhejiang Academy of Agricultural SciencesHangzhou 310000China

Anthocyanin accumulation is acknowledged as a phenotypic indicator of phosphate(Pi)***,negative regulators of this process and their molecular mechanisms remain largely *** this study,we demonstrate that WRKY33 acts as a negative regulator of phosphorus-status-dependent anthocyanin ***33 regulates the expression of the gene encoding dihydroﬂavonol 4-reductase(DFR),a rate-limiting enzyme in anthocyanin production,both directly and ***33 binds directly to the DFR promoter to repress its expression and also interferes with the MBW complex through interacting with PAP1.to indirectly inﬂuence DFR transcriptional ***�Pi conditions,PHR1.interacts with WRKY33,and the protein level of WRKY33 decreases;the repression of DFR expression by WRKY33 is thus attenuated,leading to anthocyanin accumulation in *** genetic and bio{1. assays suggest that PHR1.is also involved in regulating factors that affect WRKY33 protein *** together,ourfindings reveal that Pi starvation represses WRKY33,a repressor of anthocyanin biosynthesis,tofinely tune anthocyanin ***‘‘double-negative logic’’regulation of phosphorus-status-dependent anthocyanin biosynthesis is required for the mainte-nance of plant metabolic homeostasis during acclimation to Pi starvation.

关键词： WRKY33 phosphate signaling PHR1 Arabidopsis thaliana anthocyanins

A multi-kernel-shell indium selenide@carbon nanosphere enabling high-performance lithium-ion batteries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第9期96卷 698-708页

作者： Sihao wang Zhuoming Jia Ying {1. Yanhong {2. Xianglong Kong Yongde Yan fei He Mi{2.n Zhang {2.nzhi Wu Piaoping Yang Wenwu {2. Mei{2.n {2.u Zhi{2.ang {2.u College of Material Sciences and chemical {1. Harbin Engineering UniversityHarbin 150001HeilongjiangChina School of Materials Science&engineering Georgia Institute of TechnologyAtlantaGA 30332USA School of chemical {1. Sungkyunkwan University 2066Seobu-roJangan-guSuwon 440-746Republic of Korea College of Aerospace and Civil engineering Harbin Engineering UniversityHarbin 150001HeilongjiangChina

Indium selenide has garnered significant attention for high volumetric capacities,but is currently plagued by the sluggish charge transfer kinetics,severe volume effect,and rapid capacity degradation that hinder their practical ***,we design,synthesize,and characterize a multi-kernel-shell structure comprised of indium selenide encapsulated within carbon nanospheres(referred to as m-K-S In_(2.Se_(3)@C)through an integrated approach involving a hydrothermal method followed by a gaseous selenization ***,experimental measurements and density functional theory calculations confirm that the m-K-S In_(2.Se_(3)@C not only improve the adsorption capability for li-ions but also lower the energy barrier for li-ions *** from numerous contact points,shorter diffusion distances and an improved volume buffering effect,the m-K-S In_(2.Se_(3)@C achieves an 800 mA h g^(−1.capacity over 1.00 loops at 1.00 mA g^(−1.,a 52. mA h g^(−1.capacity at 5000 mA g^(−1.and an energy density of 2.0 Wh kg^(−1.when coupled with liFePO4,surpassing most related anodes reported ***,the m-K-S structure with unique nano-micro structure offers a new approach to the design of advanced anodes for liBs.

关键词： Multi-kernel-shell structure In_(2.Se_(3) Anode li-ion batteries

Preparation of nanocrystalline BaTiO_3 ceramics

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第6期52卷 1730-1734页

作者： DENG XiangYun1,2.li DeJun1,li JianBao2.{2. XiaoHui3 & li LongTu3 1 College of Physics and Electronic Information,Tianjin Normal university,Tianjin 300387,China 2.Materials and {2. engineering Institute,Key laboratory for Hainan Advantage Resources and Applied technology in {2. engineering Material of Ministry of Education,Hainan provincial Key laboratory of Research on Utilization of Si-Zr-Ti,Hainan university,Haikou 5702.8,China 3 department of Materials Science and engineering,Tsinghua university,Beijing 100084,China College of Physics and Electronic Information Tianjin Normal University Tianjin 300387 China Materials and chemical {1. Institute Key Laboratory for Hainan Advantage Resources and Applied Technology in Chemical Engineering Material of Ministry of Education Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Hainan University Haikou 570228 China department of Materials Science and {1. Tsinghua University Beijing 100084 China

The high-dense nanocrystalline BaTiO3(BT)ceramics with grain size smaller than 1.0nm have been successfully prepared by the two step sintering and the spark plasma sintering(SPS)*** successive transitions in nanograin BT ceramics from rhombohedral to orthorhombic,tetragonal and cubic transitions,similar to those in coarse BT ceramics,were revealed by in-situ temperature dependent Raman *** multiphase coexistence and the diffused phase transition character were demonstrated in the 8nm nanocrystalline BT ceramics.

关键词： nanocrystalline BaTiO3 ceramics preparation microstructure size effect

Acid/alkali gated photochromism of two diarylperfluorocyclopentenes

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2007年第5期50卷 581-586页

作者： CHEN ZiHui1. zhao ShengMin2. {1. ZhongYu1. ZHANG Zhi1.& ZHANG FuShi1.1.The Key Lab of Organic Optoelectronics & Molecular engineering of Ministry of Education, {2. of Chemistry, Tsinghua university, Beijing 1.0084, China 2.Lab of Printing & Packing Materials and {12.-Beijing Area Major laboratory, Beijing Institute of Graphic Communication, Beijing 1.0084, China 1. The Key Lab of Organic Optoelectronics & Molecular engineering of Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 China 2. Lab of Printing & Packing Materials and technology-Beijing Area Major {1. Beijing Institute of Graphic Communication Beijing 100084 China

Two novel diarylfuorocyclopentenes, which underwent gated photochromism, were synthesized. It was found that the photochromic property of these diarylethenes could be switched by alternative addition of acids/alkalis,... 详细信息

关键词： photochromism, diarylethene, gated reactivity, pyridinium betaine