超增溶自组装法合成纳米AlPO_4-5分子筛

采用超增溶自组装法合成纳米级AlPO4-5分子筛,考察了焙烧温度、乳化剂质量分数对分子筛粒径及其分布的影响,结果表明在超增溶纳米自组装的条件下能够合成出类球形的纳米磷铝分子筛,并且通过调节乳化剂的质量分数可以控制纳米分子筛的粒径大小,纳米磷铝分子筛直径为10~80 nm,长度为0.1~0.2μm。     

微孔-介孔复合分子筛的合成及催化应用

综述了近几年微孔-中孔复合分子筛的合成和催化应用,重点介绍了不同复合模式的微孔-中孔复合分子筛的合成方法,包括原位合成法、后合成法和纳米组装法等,并对微孔-介孔复合分子筛的应用前景进行了展望。     

微孔-介孔复合分子筛的合成研究进展

概括了近几年微孔-介孔复合分子筛的合成研究工作,主要介绍了原位合成法、后合成法和纳米组装法。原位合成法主要包括单模板合成法与双模板合成法;后合成法主要包括孔壁晶化法、附晶生长法、水热重组法、碱处理法、机械混合法与包埋法。最后对微孔-介孔复合分子筛的发展远景进行了展望。     

纳米分子筛制备及其自组装体系的研究进展

纳米分子筛具有短而规整的孔道和较开放的晶穴,不仅在催化、离子交换和复合材料方面显示优异性能,而且在分子组装、光电磁功能纳米材料制备上也是一种优良的载体材料或宿主材料。对纳米分子筛的研究还利于从深层次了解分子筛的核化和生长机理。介绍了近年来纳米分子筛合成方法的研究进展,并对合成方法进行了分类综述,同时对纳米分子筛的特点及晶化机理进行归纳,进一步对纳米分子筛在催化反应中的应用及纳米自组装体系的新成果做了概述,指出了纳米分子筛研究的几个主要方向。     

微波法合成(SBA-15)-Eu_2O_3纳米复合材料研究

本文采用了水热合成法制备出介孔分子筛SBA-15,并创新性地利用微波液相介质法、微波固相法把纳米Eu2O3成功的组装到介孔分子筛SBA-15孔道内。所制备的(SBA-15)-Eu2O3主-客体纳米复合材料表现出与Eu2O3不同的发光现象,它发出单色光,使光谱纯化。     

微波法合成(SBA-15) -Et2O3纳米复合材料研究

本文采用了水热合成法制备出介孔分子筛SBA-15,并创新性地利用微波液相介质法、微波固相法把纳米Eu2O3成功的组装到介孔分子筛SBA-15孔道内.所制备的(SBA-15) -Eu2O3主-客体纳米复合材料表现出与Eu2O3不同的发光现象,它发出单色光,使光谱纯化.     

沸石基纳米ZnO的制备及性能研究

本文应用水热分散法,通过分散进行分步化学反应,在孔径为0.78nm的沸石分子筛N aY的孔道中成功地组装了纳米ZnO粉体。经过实验:用X射线衍射仪(XRD)对产物的微观结构进行了表征,证明用水热分散法能够有效的把纳米ZnO分散组装在分子筛N aY的孔道中。     

沸石基纳米CoO的制备及表征

本文应用水热分散法,通过分散进行分步化学反应,在孔径为0.78nm的沸石分子筛NaY和孔径为0.56nm的沸石分子筛ZSM-5的孔道中成功地组装了纳米CoO粉体.经过实验:用X射线衍射仪(XRD)及红外光谱仪(IR)对产物的微观结构进行了表征,证明用水热分散法能够有效地将纳米CoO分散组装在分子筛NaY和ZSM-5的孔道中.     

沸石基纳米SnO2的制备及性能研究

本文应用水热分散法,通过分散进行分步化学反应,在孔径为0.56nm的沸石分子筛ZSM-5的孔道中成功地组装了纳米SnO2粉体。经过实验:用X射线衍射仪(XRD)对产物的微观结构进行了表征,证明用水热分散法能够有效的把纳米SnO2分散组装在分子筛ZSM-5的孔道中。     

纳米级ZSM-5分子筛的合成研究进展

相比于传统的沸石材料,纳米级ZSM-5分子筛具有较大的外比表面积,在催化反应中表现出优越的性能。通过综述近年来有关纳米级ZSM-5分子筛的研究进展,重点讨论了水热合成法、极浓体系合成法、溶剂热法、离子热法、限定空间法和干凝胶法等合成方法,同时指出了合成纳米级ZSM-5分子筛过程中影响产品粒径的因素。认为使用可循环利用的模板剂是解决生产成本高、环境污染等问题的方法。最后,指出将纳米级ZSM-5分子筛从母液中简单、高效的分离出来是当前所面临的重大挑战,开发适合于纳米级ZSM-5分子筛制备的新工艺和改进现有合成工艺使其适用于工业化生产是今后合成纳米级ZSM-5分子筛的研究方向。     

提高中孔分子筛水热稳定性技术研究进展

综述了近年来提出的各种提高中孔分子筛水热稳定性的方法，分析比较了各种方法的特点和存在的问题，指出用硅铝纳米簇进行自组装以及选用适合高温合成的模板体系将是今后的发展方向。     

玻璃中金属纳米颗粒的制备方法及研究进展

含金属纳米颗粒的玻璃材料具有优越的非线性光学特性,在开发具有特定光功能的光学元器件领域有广泛的应用前景。在玻璃材料中制备金属纳米颗粒、研究金属纳米颗粒的形成机制与行为,是目前光学与材料学领域的一大研究前沿。本文较为详尽地介绍了目前在玻璃中制备金属纳米颗粒的方法及研究进展,包括热处理法、离子注入法、光热诱导法等,对光热诱导法巨大的研究价值和应用前景作了较为详细的阐述。     

核-壳型复合结构纳米粒子研究进展

介绍了核-壳型有序组装复合结构纳米粒子(CS-NP)在作为复合半导体、生物活性物质或药物的控制释放、活性组分的包埋与保护、可控催化、解决纳米粒子的团聚以及作为纳米粒子合成反应器、分离器等方面的应用。对目前合成CS-NP的方法进行了归纳:模板法、自组装法、模板/自组装法等。详细介绍了这些方法的工艺过程,并以一些具体实例从合成产物的包埋完整度、过程的难易程度、对前聚物的要求、合成产物的稳定性、进一步修饰性等方面对这些方法的适用性、优缺点进行了评述。提出了CS-NP研究领域目前存在的问题以及今后可能的研究方向。     

The synthesis of carbon nanotube based composites with conducting, semiconducting, and insulating coatings and their optical limiting properties

Multiwalled carbon nanotubes (MWCNTs) were individually coated with conducting, semiconducting, and insulating materials. The coatings used were crystalline Au nanoparticles, TiO₂ nanoclusters, and amorphous SiO₂ nanoshells, respectively. The synthesis strategy involves a combination of self-assembly and the sol-gel technique. The synthesized nanostructures were characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy, Raman spectroscopy, and X-ray diffraction. We investigated the nonlinear optical and optical limiting properties using an open-aperture Z-scan technique and fluence-dependent transmittance measurements. Compared to the pristine MWCNTs, those with Au-, TiO₂-, and SiO₂-coatings demonstrate superior, equivalent, and inferior nonlinear optical and optical limiting properties, respectively.     

Ligand-exchange synthesis of selenophenolate-capped Au25 nanoclusters

We report the synthesis and characterization of selenophenolate-capped 25-gold-atom nanoclusters via a ligand-exchange approach. In this method, phenylethanethiolate (PhCH(2)CH(2)S) capped Au(25) nanoclusters are utilized as the starting material, which is subject to ligand-exchange with selenophenol (PhSeH). The as-obtained cluster product is confirmed to be selenophenolate-protected Au(25) nanoclusters through characterization by electrospray ionization (ESI) and matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS), thermogravimetric analysis (TGA), elemental analysis (EA), UV-Vis and (1)H/(13)C NMR spectroscopies. The ligand-exchange synthesis of [Au(25)(SePh)(18)](-)[(C(8)H(17))(4)N](+) nanoclusters demonstrates that the core size of gold nanoclusters is retained in the thiolate-to-selenolate exchange process and that the 18 surface thiolate ligands can be completely exchanged by selenophenolate, rather than giving rise to a mixed ligand shell on the cluster. The two types of Au(25)L(18) (L = thiolate or selenolate) nanoclusters also show some differences in stability and optical properties.     

Microgel electrospinning: A novel tool for the fabrication of nanocomposite fibers

We demonstrate for the first time herein that electrospinning of soluble crosslinked polymer particles (microgels) is feasible and that it can be used to obtain micron-sized fibers from these macromolecules. Most notably, the electrospinning approach is found to be successful also in the case of microgels bearing metal nanoclusters, and allows to prepare composite fibers containing a homogeneous dispersion of metal nanoparticles without alterations in the nanoparticle size and size distribution. Given the broad applicability of microgels as exotemplates and stabilisers for inorganic nanoparticles, the proposed preparation method stands out as a novel, general approach for the synthesis of potentially useful composite fibers containing inorganic nanoparticles.     

含导电聚苯胺类锂离子电池复合材料的现状及发展趋势

导电聚苯胺（PANI）是近十年来研究最多的导电聚合物,具有比容量高、氧化还原可逆性好、电导率高、合成方法简单、成本低等特点,在化学电源和超级电容器中的应用最为广泛。导电聚苯胺复合材料的合成方法主要分为：原位复合法、共混法、自组装和电化学复合法等。导电聚苯胺复合材料可作为高能物质用于研发电极材料,但目前利用导电聚苯胺对锂离子电池三元正极材料进行修饰改性的研究较少。综述了导电聚苯胺及其复合材料的热电化学性能,重点对导电聚苯胺/锂离子电池复合正极材料的性能进行了阐述。最后对导电聚苯胺复合材料的应用和研究方向进行了总结,并简述了导电聚苯胺包覆改性LiNi_1-x-yCo_xMn_yO₂复合材料的应用和展望。     

Controlled reduction for size selective synthesis of thiolate-protected gold nanoclusters Aun (n = 20, 24, 39, 40)

ABSTRACT: This work presents a controlled reduction method for the selective synthesis of different sized gold nanoclusters protected by thiolate (SR = SC2H4Ph). Starting with Au(III) salt, all the syntheses of Aun(SR)m nanoclusters with (n, m) = (20, 16), (24, 20), (39, 29), and (40, 30) necessitate experimental conditions of slow stirring and slow reduction of Au(I) intermediate species. By controlling the reaction kinetics for the reduction of Au(I) into clusters by NaBH4, different sized gold nanoclusters are selectively obtained. Two factors are identified to be important for the selective growth of Au20, Au24, and Au39/40 nanoclusters, including the stirring speed of the Au(I) solution and the NaBH4 addition speed during the step of Au(I) reduction to clusters. When comparing with the synthesis of Au25(SC2H4Ph)18 nanoclusters, we further identified that the reduction degree of Au(I) by NaBH4 also plays an important role in controlling cluster size. Overall, our results demonstrate the feasibility of attaining new sizes of gold nanoclusters via a controlled reduction route.