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SYNTHESIS AND CHARACTERIZATION OF STRUCTURALLY WELL-DEFINED POLYMER-INORGANIC HYBRID NANOPARTICLES VIA ATRP

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Chinese Journal of Polymer Science 2002年第3期20卷 261-267页

作者： Jie Bai Jie-bin Pang Kun-yuan Qiu Yen Wei Department of Polymer Science & Engineering College of Chemistry & Molecular Engineering Peking University Beijing 100871, China Department of Chemistry Drexel University Philadelphia, PA 19104 USA Department of Polymer Science & Engineering College of Chemistry & Molecular Engineering Peking University 北京 100871 Department of Chemistry Drexel University 美国 Philadelphia PA 19104

Atom transfer radical polymerization (ATRP) using cuprous chloride/2,2'-bipyridine (bipy) was applied to graft polymerization of styrene on the surface of silica nanoparticles to synthesize polymer-inorganic hybrid nanoparticles, 2-(4Chloromethylphenyl) ethyltriethoxysilane (CTES) was immobilized on the surface of silica nanoparticles through condensation reaction of the silanol groups on silica with triethoxysilane group of CTES. Then ATRP of St was initiated by this surface-modified silica nanoparticles bearing benzyl chloride groups, and formed PSt graft chains on the surface of silica nanoparticles. The thickness of the graft chains increased with reaction time. End group analysis confirmed the occurrence of ATRP. Thermal analysis indicated that thermal stabilization of these resulting hybrid nanoparticles also increases with polymerization conversion. The results above show that this 'grafting from' reaction could be used for the preparation of polymer-inorganic hybrid nanoparticles with controlled structure of the polymer's end groups.

关键词： atom transfer radical polymerization polymer-inorganic hybrid nanoparticles 2-(4-chloromethylphenyl)ethyltriethoxysilane surface-modification

Chemical modification and the photoluminescence stabilization of titanic acid nanotubes

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Science China Chemistry 2006年第2期49卷 155-161页

作者： ZHANG Xingtang WANG Yumei ZHANG Chunmei JIANG Xiaohong TIAN Baoli LI Yuncai HUANG Yabin DU Zuliang Key Laboratory for Special Functional Materials Henan UniversityKaifeng 457001China

Titanic acid nanotubes(H_(2)Ti_(2)O_(4)(OH)_(2))were surface-modified with cetyl alcohol through dehydration reaction because of existence of Ti–*** modified nanotubes were characterized by transmission electron microscopy(TEM),Fourier Transform Infrared(FT-IR)spectrometry and pho-toluminescence(PL)*** results indicate that the modified nanotubes can be easily dis-persed into organic solvent such as chloroform and toluene in contrast with the unmodified nanotubes,which makes it easier to be assembled by LB ***,the Ti-O-CH_(2)(CH_(2))_(14)CH_(3) on the surface of the nanotubes can hinder the adsorption of water and consequently the photoluminescence property of the nanotubes can be *** though kept in humid condition or in air for a long time,the modified nanotubes also maintain the special photoluminescence property in the visible region.

关键词： titanic acid nanotubes surface-modification photoluminescence

Preparation of SiO_2 Nanoparticles by Silicon and Their Dispersion Stability

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Journal of Wuhan University of Technology(Materials Science) 2005年第2期20卷 74-76页

作者：庞金兴 School of Science Wuhan University of TechnologyWuhan 430070China Prof

Silicon dioxide sol was synthesized by silicon in the presence of alkali catalyst. SiO_2 nanoparticles (size in 8-15 nm) aqueous dispersion was prepared by using dispersion and surface modification in situ. The effects of reaction time, temperature, medium pH value, dispersant and surface-modifier on their diameters, sizes distribution and dispersion stability were also *** experimental results show that the preparation method can effectively resolve the dispersion stability of SiO_2 nanoparticles in water.

关键词： nanoparticles forming in situ surface-modification size distribution dispersion stability

Second-order Nonlinearities of CdS Nanoparticles Studied by Hyper-Rayleigh Scattering Technique

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Chinese Chemical Letters 2000年第4期11卷 375-376页

作者： Yu ZHANG Xin WANG De Gang FU Ju Zheng LIU Zu Hong LU. (National Laboratory of Molecular and Biomolecular Electronics. Department of Chemistry and Chemical Engineering. Southeast University. Nanjing 210096) Natl. Lab. Molec. Biomol. E. Dept. of Chem. and Chem. Engineering Southeast University Nanjing 210096 China

A series of CdS nanoparticles with different surfaces were prepared by colloidal chemical method and reverse micelle method. Their second-order nonlinear optical (NLO) properties were experimentally studied in solution by newly developed hyper-Rayleigh scattering (HRS) technique. The results show that 'per particle' first-order hyperpolarizability beta values are sensitive To the synthetic method and the surface chemical modification.

关键词： second-order nonlinear optical properties hyper-Rayleigh scattering (HRS) first-order hyperpolarizability CdS nanoparticles surface-modification