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161.
162.
E. Yu. Yagudaeva M. R. Muidinov D. V. Kapustin V. P. Zubov 《Russian Chemical Bulletin》2007,56(6):1166-1173
Polyaniline coatings of the cation-exchange resin Dowex and a synthetic composite material based on silica gel surface-modified
by a sulfated styrene-divinylbenzene copolymer were prepared by precipitative polymerization of aniline on the surface of
the supports. The optimal conditions for the preparation of the polyaniline-containing material providing the formation of
a thin polymeric coating on the support surface were determined. Aniline is predominantly consumed to the formation of a uniform
polymeric coating about 3 nm thick with an increase in the concentration of sulfo groups on the support surface. The efficiency
of using the polyaniline-containing sorbents for the preparative isolation of DNA from plant tissue lysates was demonstrated.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1123–1130, June, 2007. 相似文献
163.
Han Nim Choi 《Analytica chimica acta》2006,565(1):48-55
A highly sensitive and stable tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy)32+) electrogenerated chemiluminescence (ECL) sensor was developed based on carbon nanotube (CNT) dispersed in mesoporous composite films of sol-gel titania and perfluorosulfonated ionomer (Nafion). Single-wall (SWCNT) and multi-wall carbon nanotubes (MWCNT) can be easily dispersed in the titania-Nafion composite solution. The hydrophobic CNT in the titania-Nafion composite films coated on a glassy carbon electrode certainly increased the amount of Ru(bpy)32+ immobilized in the ECL sensor by adsorption of Ru(bpy)32+ onto CNT surface, the electrocatalytic activity towards the oxidation of hydrophobic analytes, and the electronic conductivity of the composite films. Therefore, the present ECL sensor based on the CNT-titania-Nafion showed improved ECL sensitivity for tripropylamine (TPA) compared to the ECL sensors based on both titania-Nafion composite films without CNT and pure Nafion films. The present Ru(bpy)32+ ECL sensor based on the MWCNT-titania--Nafion composite gave a linear response (R2 = 0.999) for TPA concentration from 50 nM to 1.0 mM with a remarkable detection limit (S/N = 3) of 10 nM while the ECL sensors based on titania-Nafion composite without MWCNT, pure Nafion films, and MWCNT-Nafion composite gave a detection limit of 0.1 μM, 1 μM, and 50 nM, respectively. The present ECL sensor showed outstanding long-term stability (no signal loss for 4 months). 相似文献
164.
Rongbin Qi Yujun Wang Jiding Li Changwei Zhao Shenlin Zhu 《Journal of membrane science》2006,280(1-2):545-552
Worldwide concerns over environment have stimulated increasing interest both in academic and industry for deep desulfurization of gasoline. Polydimethylsiloxane (PDMS) composite membrane was used to separate the binary and multicomponent alkane/thiophene mixtures by pervaporation. Effect of carbon number and concentration of alkane, and of feed temperature, on the separation efficiency of alkane/thiophene mixtures was investigated experimentally. Experimental results of binary mixtures indicated that the total fluxes for different alkane/thiophene mixtures decrease with increase of carbon number in the alkanes. Corresponding activation energies of permeation for alkanes in PDMS membrane increase with increase of carbon number in the alkanes. Differences of molecular size and structure of the alkanes lead to various selectivities thereof within PDMS membrane. In addition, the permeability and activation energy of thiophene in various systems differ from each other due to coupling effect which should be taken into consideration when dealing with multicomponent systems. Pervaporation results of ternary systems indicated that, the increase of content of lighter alkane in feed would result in a larger total flux, but a smaller selectivity to thiophene simultaneously. A quaternary system, the mixture of n-heptane, n-octane, n-nonane and thiophene, was employed to simulate the desulfurization process of gasoline. With the membrane having a PDMS layer of 11 μm, the total flux was measured to be about 1.65 kg/m2 h, with the corresponding enrichment factor of thiophene 3.9 at 30 °C. 相似文献
165.
166.
TiO2/Eu-MCM纳米超分子材料的组装和光催化性能 总被引:1,自引:0,他引:1
利用有机相-水相界面共沉淀溶胶支持自组装方法制备粒径为15 nm、孔径为8 nm的分子筛Eu-MCM, 它拥有734 m2/g的比表面积和1.49 cm3/g的比孔容. 把TiO2组装到Eu-MCM的孔道中, 组装成TiO2/Eu-MCM纳米复合材料. XRD, RAMAN和选区电子衍射花样分析表明纳米复合材料中的TiO2为锐钛型. TiO2/Eu-MCM的发光表现为Eu3+离子的特征光谱, 激发峰分别为342 (5L10), 358 (5L9), 378 (5L7), 390 (5L6), 411 (5D3), 462 (5D2)和524 (5D1) nm; 发射峰为579, 592, 613, 653和701 nm, 归属于5D0→7FJ (J=0, 1, 2, 3, 4)组态间的跃迁. 纳米复合材料的发光强度都要比Eu-MCM的发光强, 其中43%TiO2/Eu-MCM的发光最强. 荧光和紫外漫反射结果表明客体TiO2对主体分子筛存在能量传递效应. 在微弱的紫外灯光照射下, TiO2/Eu-MCM纳米复合材料对苯酚的光催化氧化性能和其发光强度具有一定的相关性. 29%TiO2/Eu-MCM的纳米复合材料拥有的比表面积、孔容和孔径分别为204 m2/g, 0.24 cm3/g和4.7 nm. 29%TiO2/Eu- MCM对苯酚具有68%的最高光催化氧化产率和85%催化氧化选择性. 相似文献
167.
168.
纳米Y2O3/钴基合金激光熔覆层的组织 总被引:6,自引:0,他引:6
利用5 kW CO2激光器,在Ni基高温合金表面,熔覆纳米稀土氧化物(Y2O3)/钴基合金复合材料,制备了涂层.利用光学显微镜、扫描电镜及透射电镜分析了熔覆层的组织结构.结果表明: 熔覆层的主要相组成为γ-Co,ε-Co,Cr23C6和Y2O3;加入纳米Y2O3,凝固组织由细长的柱状树枝晶转变为较短的树枝晶;纳米Y2O3含量增大至1%时整个断面获得等轴晶组织;纳米Y2O3作为异质形核的核心,细化了组织;纳米Y2O3在熔覆层中分布不均匀,促进了γ-Co向ε-Co的转变;熔覆层的亚结构为堆跺层错.对熔覆层等轴组织形成机制进行了分析. 相似文献
169.
The attempt to prepare structurally well-defined polymer/inorganic composite particles, i.e., poly(methyl methacrylate) (PMMA)/CaCO3/SiO2 three-component composite particles, via reverse atom transfer radical polymerization (ATRP), using 2-2′-azo-bis-isobutyronitrile as initiator and Cu(II) bromide as catalyst was reported. CaCO3/SiO2 two-component composite particles were first obtained through sol–gel method, and their morphology and surface element information were determined by transmission electron microscopy and X-ray photoelectron spectroscopy, respectively. The results indicate that the CaCO3 was encapsulated by the obtained SiO2. After being modified by silane coupling agent, the CaCO3/SiO2 composite particles copolymerized with methyl methacrylate (MMA) under standard reverse ATRP conditions to produce PMMA/CaCO3/SiO2 three-component composite particles. In the case concerned, first-order kinetic plots and linear increase of molecular weight (Mn) vs conversion and narrow molecular weight distribution for the graft polymer samples were observed. Furthermore, the gel permeation chromatography results illustrated that both the free PMMA chains from the solvent and the graft PMMA chains from the surface of CaCO3/SiO2 two-component composite particles were growing at the same rate. Characterizations of the PMMA-grafted CaCO3/SiO2 composite particles were done by Fourier transform infrared and thermogravimetric analysis. The results showed that the surface of the modified inorganic particles was grafted by the MMA and that the grafting percentage was about 8.7%. 相似文献
170.
AbstractBacterial cellulose (BC) is an extracellular natural polymer produced by many microorganisms and its properties could be tailored via specific fabrication methods and culture conditions. There is a growing interest in BC derived materials due to the main features of BC such as porous fibrous structure, high crystallinity, impressive physico-mechanical properties, and high water content. However, pristine BC lacks some features, limiting its practical use in varied applications. Thus, fabrication of BC composites has been attempted to overcome these constraints. This review article overviews most recent advance in the development of BC composites and their potential in biomedicine including wound dressing, tissue engineering scaffolds, and drug delivery. Special emphasis is placed on the fabrication and applications of BC-containing nanofibrous composites for biomedical usage. It summarizes electrospinning of BC-based nanofibers and their surface modification with an outline on challenges and future perspective. 相似文献