检索结果-南通市图书馆

Science china chemistry 2004年第5期47卷 414-419页

作者： WU Yukai1, OU Yuxiang1, LIU Zhiguo1,2., LIU Jinquan1, MENG Zheng1 & CHEN Boren1 1. School of Materials Science and engineering, Beijing Institute of Technology, Beijing 100081, china 2. School of {2. and chemical engineering, Henan university, Kaifeng 475001, china 1. School of Materials Science and engineering Beijing Institute of Technology 100081 Beijing China 2. School of chemistry and chemical {2. Henan University 475001 Kaifeng China

Tetranitrodiazidoacetylhexaazaisowurtzitane (TNDAIW) is a novel polyazapolycyclic caged polyazidonitramine explosive first synthesized in our laboratory. All of the possible con- formers of TNDAIW are optimized using both the AM1 and PM3 methods. TNDAIW is predicted to have more polymorphs than hexanitrohexaazoisowurtzitane (CL-2.). The HF/6-31G(d) level of theory is used to investigate the lowest energy structures of D-TNDAIW for both AM1 and PM3. The possible conformers of TNDAIW are predicted to be more stable than epsilon-CL-2. based on the N-NO2.bond lengths. The impact and shock sensitivities of both the possible DA- and DP-TNDAIW are lower than the corresponding ones of epsilon-CL-2.. TNDAIW with the possible conformers is estimated to be a promising novel high energy density explosive.

关键词： tetranitrodiazidoacetylhexaazaisowurtzitane, molecular modeling, impact and shock sensitivities.

Preparation and Electrocatalytic Activity of Polyaniline-poly (Propylene Oxide) Modified by Pt Nanoparticles

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials Science) 2006年第4期21卷 9-11页

作者：李美超 College of chemical engineering and Material Science State Key Laboratory Breeding Base of Green Chemistry-Synthesis TechnologyZhejiang University of TechnologyHangzhou 310032China

The preparation and electrocatalytic activity of polyaniline-poly （ propylene oxide ）（ PAN-PPO ） modified by Pt particles （ Pt/ PAN-PPO ） were investigated. Pt/ PAN-PPO was characterized by scanning electron microscopy （SEM） and energy dispersive spectroscopy （ EDS ）. Pt particles on PAN-PPO were in the nanometer range, and dispersed in a three-dimensional distribution on the surface of PAN-PPO film. Compared with polyaniline and glassy carbon modified with Pt particles under the same conditions, Pt/PAN-PPO exhibited a high electrocatalytic activity for lysine oxidation.

关键词： aniline propylene oxide copolymer platinum electrocatalytic activity lysine

Preparation of TiO_2.activated carbon with Fe ions doping photocatalyst and its application to photocatalytic degradation of reactive brilliant red K2.

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2009年第8期52卷 1113-1119页

作者： LI YouJi,LI Jing,MA MingYuan,OUYANG YuZhu & YAN WenBin College of chemistry and chemical {2.,Jishou university,Jishou 416000,china 1. College of chemistry and chemical {2. Jishou University Jishou 416000 China

Titanium dioxide coated on activated carbon(AC) with Fe ions doping(Fe-TiO2.AC) composite was prepared by an improved sol-gel *** photocatalytic activities were tested by photocatalytic degradation of reactive brilliant red K2. in *** results show that in comparison with the agglomeration of pure TiO2.the TiO2.nanoparticles are well dispersed in the AC matrix,of which sizes are decreased with Fe ions ***,the iron species on TiO2.of composite are Fe2.3 and FeO,which do not affect the crystalline structures of TiO2.*** AC matrix and iron doping content influence the fluorescence intensity of composite due to their effects on recombination probability of hole-electron *** with TiO2.0.3% Fe-TiO2.TiO2.AC,0.5% Fe-TiO2.AC and 0.1% Fe-TiO2.AC,the 0.3% Fe-TiO2.AC shows the highest photoactivity with the complete mineralization of K2. for finite time due to the optimum Fe ions content and AC ***,the kinetic constant(k=0.02.9 min-1) of 0.3% Fe-TiO2.AC composite is more than the sum of both TiO2.AC(0.0154 min-1) and 0.3% Fe-TiO2.0.0057 min-1) because coexistence of the AC and Fe ions has an enlarging effect on improving the photoactivity of TiO2.

关键词： TiO2 nanoparticles Fe ions activated carbon photocatalysis reactive brilliant red K2.

Supramolecular self-assembly and controllable drug release of thermosensitive hyperbranched multiarm copolymers

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2010年第3期53卷 487-494页

作者： GUO Bo,SUN XiaoYi,ZHOU YongFeng & YAN DeYue College of chemistry and chemical {2.,Shanghai Jiao Tong university,Shanghai 2.02.0,china 1. College of chemistry and chemical {2. Shanghai Jiao Tong University Shanghai 200240 China

A novel temperature-responsive hyperbranched multiarm copolymer with a hydrophobic hyperbranched poly(3-ethyl-3-(hydroxymethyl)oxetane)(HBPO) core and thermosensitive poly(N-isopropylacrylamide)(PNIPAM) arms was synthesized via the atom transfer radical polymerization(ATRP) of NIPAM monomers from a hyperbranched HBPO *** was found that HBPO-star-PNIPAM self-assembled into multimolecular micelles(around 60 nm) in water at room temperature according to pyrene probe fluorescence spectrometry,1H NMR,TEM,and DLS *** micelle solution showed a reversible thermosensitive phase transition at a lower critical solution temperature(LCST)(around 32.C) observed by variable temperature optical absorbance *** temperature NMR and DLS analyses demonstrated that the LCST transition originated from the secondary aggregation of the micelles driven by increasing hydrophobic interaction due to the dehydration of PNIPAM shells upon *** drug loading and release properties of HBPO-star-PNIPAM micelles were also investigated using prednisone acetate as a model *** micelles showed a much improved drug encapsulation efficiency and temperature-dependent sustainable release behavior due to the special micellar *** micelles exhibited no apparent cytotoxicity against human HeLa cells.

关键词： hyperbranched polymers thermosensitive copolymer supramolecular self-assembly ATRP drug delivery

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, LI Xingchang2.& TANG Ji’an2.1. chemistry and chemical {2. Department, Suzhou university, Suzhou 2.5006, china 2. Key Laboratory of Colloid and Interface Science, Institute of chemistry, Chinese Academy of Sciences, Beijing 100080, china Correspondence should be addressed to Tang Ji’an (email: jatang@***) 1. chemistry and chemical {2. Department 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.

A study on methane coupling to acetylene under the microwave plasma

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2010年第1期53卷 231-237页

作者： SHEN ChangSheng1,SUN YongZhi1,SUN DeKun2.& YANG HongSheng1 1State Key Laboratory of Millimeter Waves School of Electronic Science and engineering,Southeast university,Nanjing 2.0096,{2. 2.chool of chemistry and chemical engineering,Nanjing university,Nanjing 2.0093,{2. 1. State Key Laboratory of Millimeter Waves School of Electronic Science and engineering Southeast University Nanjing 210096 China2. School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

By optimizing the microwave chemistry reactor made of the rectangular waveguide resonator,the methane conversion(the maximum 93.7%),the C2.hydrocarbon yield(the maximum 91.0%) and the acetylene yield(the maximum 88.6%) were all greatly increased under the microwave ***,for the optimal reactor,the change of the methane conversion and the C2.hydrocarbon yield is little within the range of the pressures in the *** C2.hydrocarbon is mainly made up of acetylene,and the selectivity for acetylene is above 90%.Energy yield and space time yield of acetylene are also *** emission spectroscopy(OES) was adopted for the diagnosis of methane coupling to acetylene under microwave *** excited species(CH,C2.H2.Hα) were detected in the spectra range of 300-750 *** on the products and the excited species,the reaction mechanism of methane coupling under microwave plasma was investigated,using the thermodynamics and kinetics of the chemical reaction.

关键词： microwave plasma methane acetylene

在线全文

学校读者我要写书评

暂无评论

溶胶-凝胶工艺合成Ti(C,N)超细粉末

无机材料学报 1998年第5期13卷 739-744页

作者：向军辉肖汉宁湖南大学化学化工学院长沙410082

以TiO（OH）2.胶和炭黑为主原料，采用溶胶-凝胶工艺。经N2.氛下碳热还原合成了Ti（C，N）超细粉末．分析了合成过程的热力学，探讨了原料配比、合成温度、保温时间和氮气流量等工艺参数对Ti（C,N）组成和性能的影响．通过控制工艺条... 详细信息

以TiO（OH）2.胶和炭黑为主原料，采用溶胶-凝胶工艺。经N2.氛下碳热还原合成了Ti（C，N）超细粉末．分析了合成过程的热力学，探讨了原料配比、合成温度、保温时间和氮气流量等工艺参数对Ti（C,N）组成和性能的影响．通过控制工艺条件，可以得到x值为0．2.0．7，粒径＜100nm的Ti（C1-x，Nx）超细粉末.

关键词：溶胶凝胶碳氮化钛超细粉末粉末冶金

Preparation and photocatalytic activity of TiO_2.coated granular activated carbon composites by a molecular adsorption-deposition method

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2008年第11期51卷 1036-1043页

作者： LI YouJi, LI Jing, MA MingYuan, OUYANG YuZhu & YAN WenBin College of chemistry and chemical {2., Jishou university, Jishou 416000, china 1. College of chemistry and chemical {2. Jishou University Jishou 416000 China

TiO2.nanoparticle-coated granular activated carbon (GAC) composite photocatalysts (CPs) were suc-cessfully prepared by a molecular adsorption-deposition (MAD) method. The CPs were detected by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), BET surface area and UV-Vis adsorption spectroscopy, and their photoactivity was evaluated by methyl orange (MO) photodegradation. The results show that small-sized TiO2.nanoparticles were dispersed well, deposited on the surface of GAC, and showed slight blue shift in comparison with pure TiO2. With the increase in TiO2.content, the CPs showed band gaps in lower energy, smaller surface areas and the higher content of Ti3+ ions. Compared with pure TiO2.and others CPs samples, CPs-382.sample showed the highest photoactivity due to the optimum TiO2.content and surface area besides the synergic effect of photocatalytic degradation of TiO2.and adsorptive property of GAC. In addition, the CPs could be very easily reclaimed, recycled and reused for methyl orange removal while high photoactivity is pre-served.

关键词： photocatalysis titanium dioxide granular activation carbon composites molecular adsorption–deposition method

A simple solution route to control synthesis of Fe_3O_4 nanomaterials at low temperature and their magnetic properties

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2009年第7期52卷 916-923页

作者： LIU Yi1,2. CHEN Yun1, ZENG YuPing2.& WANG ShiLong3 1 Department of chemistry and chemical {2., Zaozhuang university, Zaozhuang 2.7160, china 2.Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 2.0050, china 3 School of Life Science and Technology, Tongji university, Shanghai 2.0092. china 1. Department of chemistry and chemical {2. Zaozhuang University Zaozhuang 277160 China 2. Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China 3. School of Life Science and Technology Tongji University Shanghai 200092 China

A series of nanostructured iron compounds including cubic Fe3O4 and orthorhombic FeOOH were synthesized via a facile low temperature (in the range of 60-100℃) solution method. In the whole process, the interaction between FeCl2.4H2. and methenamine (C6H12.4) was carried out through a reflux device under different reaction conditions such as temperature, solvent, and duration. The samples were detected by XRD, TEM, SAED, physical property measurement system, and Mssbauer spectroscopy, separately. The experiments showed that magnetic mixture nanoparticles had flake and rod morphologies, and cubic Fe3O4 took on grain nanostructure. Magnetism measurements indicated that the saturated magnetization of the as-obtained magnetic mixture was lower than that of the cubic magnetite. Mssbauer spectroscopy testified the sample consisting of cubic magnetite rather than γ-Fe2.3. In addition, a possible growth mechanism of cubic magnetic nanoparticles under different conditions was discussed.

关键词： magnetic nanoparticles cubic Fe3O4 oxidation-coprecipitation method reflux magnetic properties at room temperature Mssbauer spectrum

Rhodamine B doped silica nanoparticle labels for protein microarray detection

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2010年第4期53卷 747-751页

作者： WANG Ying1, LI ZhongHui1, ZHONG WenYing2. LI Hui2. XU DanKe1 & CHEN HongYuan1 1Key Laboratory of Analytical chemistry for Life Science, Ministry of Education School of chemistry and {2. engineering, Nanjing university, Nanjing 2.0093, china 2.epartment of Analytical chemistry, china Pharmaceutical university, Nanjing 2.0009, china 1. Key Laboratory of Analytical chemistry for Life Science Ministry of Education School of chemistry and chemical {2. Nanjing University Nanjing 210093 China2. Department of Analytical Chemistry China Pharmaceutical University Nanjing 210009 China

A core-shell Rhodamine B-doped SiO2.nanoparticle was synthesized and its fluorescent intensity was found to be 1000 times higher than that of individual Rhodamine B molecule. The doped nanoparticles were further conjugated with streptavidin and the resulting nanoparticles were used in the detection of reverse-phase protein microarrays, in which human IgG of various concentrations was first immobilized on aldehyde-modified glass slides and then biotinlyated goat anti human IgG as well as the labeled nanoparticles were sequentially conjugated. The calibration curve is linear over the range from 800 fg to 500 pg and the limit of detection is 100 fg, which is 8 times lower than that of streptavidin-labeled Cy3 fluorescent dyes. The dyedoped SiO2.nanoparticles show potentials for the protein array detection.

关键词： Rhodamine B SiO2 nanoparticles protein detection protein microarrays