MIL-101/P25复合材料的制备及光催化性能

采用水热法,将MIL-101负载到预处理过的P25表面,制得MIL-101/P25复合光催化材料,通过X射线衍射(XRD)、傅里叶变换红外(FTIR)、低温N2物理吸附-脱附(BET)、热重(TG)、场发射透射电镜(FETEM)和光致发光光谱(PL)等对催化剂进行结构表征,同时考察MIL-101及复合材料的稳定性,并且提出协同因子指标来定量评价复合带来的协同效应。结果表明MIL-101呈片状,与P25部分结合。复合后,MIL-101的稳定性得到提高。在适当的配比下,复合具有协同效应,当Cr(NO3)3·9H2O与P25的物质的量之比为1∶1时,复合材料对罗丹明B的可见光催化活性最高,协同因子达到1.64。复合材料对无色有机污染物水杨酸同样表现出良好的光催化效果。     

MIL-101/P25复合材料的制备及光催化性能

本文采用水热法,将MIL-101负载到预处理过的P25表面,制得MIL-101/P25复合光催化材料,通过X射线衍射（XRD）、傅里叶变换红外（FTIR）、低温N₂物理吸附-脱附（BET）、热重（TG）、场发射透射电镜（FETEM）和光致发光光谱（PL）等对催化剂进行结构表征,同时考察MIL-101及复合材料的稳定性,并且提出协同因子指标来定量评价复合带来的协同效应。结果表明MIL-101呈片状,与P₂₅部分结合。复合后,MIL-101的稳定性得到提高。在适当的配比下,复合具有协同效应,当Cr（NO₃）₃·9H₂O与P25的物质的量之比为1：1时,复合材料对罗丹明B的可见光催化活性最高,协同因子达到1.64。复合材料对无色有机污染物水杨酸同样表现出良好的光催化效果。     

聚苯胺纳米粒子的反胶束法合成及自组装

聚苯胺纳米粒子的反胶束法合成及自组装;聚苯胺;纳米粒子;反胶束;自组装     

反胶束法合成氧化锌微晶及其荧光特性

0引言材料的结构(微结构)、尺寸和形貌等因素对其特性及其实际应用具有重要的影响。对无机材料特别是氧化物半导体进行结构控制的研究近年来引起了人们极大的关注。氧化锌作为一种宽带隙(3.2eV)半导体材料,可广泛应用于压电材料、气体传感器、橡胶添加剂和光学器件等领域,而且还因其在室温下可产生激射现象使其成为纳米光学材料研究领域中的一大热点[1￣6]。目前,除了传统的固相-气相(V S)反应外,用于氧化锌微晶的制备方法主要有共沉淀法[7]、多羟基化合物水解法[8]、有机金属气相沉积法[9￣12]和水热法[13]等。通过选择不同的制备方法和…     

反胶束法合成CdS纳米粒子及其表征

以AOT为保护剂,采用反胶束法合成CdS纳米粒子。利用水洗法洗去保护剂AOT,通过加入不同量的无水乙醇调节分散介质的极性,改变CdS纳米粒子在分散介质中的"溶解度",从而实现不同尺寸粒子的分离。采用紫外-可见(UV-vis)吸收光谱、透射电子显微镜(TEM)、荧光光谱法对其进行表征。     

反胶束体系中合成聚苯胺-无机物复合纳米微粒

利用阴离子型表面活性剂2-乙基己基琥珀酸钠(AOT)形成的反胶束作为微反应器合成了聚苯胺-氯化银和聚苯胺-硫酸钡复合纳米粒子;考察了搅拌因素和不同合成步骤对聚苯胺-硫酸钡尺寸及形态的影响;并利用TEM, IR, UV-vis, XRD和四探针电导率仪对产物进行了表征.研究结果表明,反胶束法可以有效地应用于有机-无机复合纳米材料的制备.     

反胶束微乳液法合成纳米SrTiO3研究

The precursors of SrTiO3 were prepared by inverse micell microemulsion method. SrTiO3 nano-powders were synthesized by calcining the precursors at 800℃ in air for 4 hours and were characterized by XRD, IR,TG, SEM. The results show that the spherical SrTiO3 nano-particles have narrow distribution with an average size of 40 nm. The surfactants played an important role in controlling shape and size of nano-particles, and combined surfactants were more effective than single surfactant.     

MnOOH纳米棒的反胶束法制备及表征

采用水溶液/CTAB/正丁醇/庚烷四组分组成的反相胶束体系,制备了MnOOH纳米棒,并用透射电镜(TEM)、高分辨透射电镜(HRTEM)和X射线粉末衍射(XRD)进行了表征.结果显示所得MnOOH为单斜晶系,直径约为10 nm、长度约为200 nm.实验表明,不同的反应时间所得纳米棒的长度不同,但直径可以保持不变.     

胶束及反胶束微环境中的槲皮素金属配合物

无机金属元素可与中药活性有机化合物通过配位键结合形成配合物,进而影响药物的生理活性[1]。但配合物的形成往往改变了原有机成分的溶解性能(如水溶性或脂溶性),而表面活性胶束体系可使金属有机配合物的水溶性或脂溶性得到明显改善,从而提高药物的生物利用度和改善药物的吸收。然而,胶束体系中已有的研究多是针对单纯的有机化合物[2]或生物分子如蛋白质[3]等,而涉及金属配合物胶束溶液的则很少,尤其是反胶束微环境中的中药金属配合物。反胶束亦称W/O型微乳液,是双亲物质在非极性有机溶剂中自发形成的具有纳米尺寸的含有水核的微小胶团聚集…     

溶剂对反胶束法合成CdS纳米粒子粒径的影响

以磺基琥珀酸二辛酯钠盐(AOT)为保护剂,利用反胶束法在不同烷烃溶液中合成了CdS纳米粒子.采用紫外-可见光谱、透射电子显微镜、荧光光谱法对其进行表征.研究表明:在不同烷烃溶液中合成的CdS纳米粒子,其粒子大小和荧光强度都随溶剂而改变.     

胶束增敏荧光光度法测定布美他尼

提出了在表面活性剂ＴｒｉｔｏｎＸ－１００存在下,高灵敏度胶束增敏测定布美他尼的荧光光度新方法。方法灵敏度高,检出限为２．０·１０＾－８ｍｏｌ·Ｌ＾－１,线性范围宽,为２．２·１０＾－８￣１．５·１０＾－５ｍｏｌ·Ｌ＾－１回收率为９９．８％,本对测定条件作了详细研究,本方法已应用于样品中布美他尼的测定。     

三甲基硅基化有机硅玻璃树脂的合成及性能

它进一步交联同化后便得到高度交联的固化体。由于其高透明性及高硬度,外观似玻璃,故该树脂有玻璃树脂之美称。它对紫外光有高度的透明性,因而是优良的耐紫外涂层。然而,这种玻璃树脂固化体质脆,作为涂层,其可涂厚度通常在20μm 以下。若将它配以高量填料,则该有色涂层极易开裂。为克服其脆性。Gilligan 等采用(CH_3)_3SiCl 作为硅基化试剂与玻璃树脂溶液在 DMF 中0℃下进行反应,成功地使三甲基硅氧基(CH_3)_3SiO 取代树脂中部分硅醇基,制得韧性硅基化玻璃树脂2作为     

Highly Uniform Nano and Mesostructures of Silica Obtained by Reverse Micellar and Hydrothermal Methods

Silica nanoparticles with controlled size and morphology and a high degree of monodispersity have been synthesized using single and double microemulsion systems employing a cationic surfactant (CTAB) and a non-ionic surfactant (Tergitol). Depending on the type of surfactant aggregate acting as templates, very different morphologies were formed. Nanospindles of silica of ~200–300 nm in length and nanofibres could be obtained by suitably controlling the reverse micellar methodology. The hydrothermal method resulted in highly porous and uniform spheres of diameter ~300 nm which appears to be formed from aggregates of small silica nanoparticles of size ~10 nm. The surface area of the nanoparticles (119 m²/g) was found to be much higher than the corresponding bulk SiO₂ (500–600 nm) which had a surface area of 22 m²/g. The hydrothermally obtained spheres of size ~300 nm show a surface area of 35 m²/g. In honor of Prof. C.N.R. Rao, FRS, on his 75th birth anniversary.     

Synthesis and Photochemical Properties of Monolithic TiO2 Nanowires Diode

In this paper, the structural and photochemical properties of a monolithic photochemical diode are discussed. The present structure is composed, from the top to the bottom, of a TiO₂ nanowire layer, a TiO₂ film, a Ti foil, and a porous layer made of Pt nanoparticles. The synthesis of the nanowires was simply carried out by Au-catalysed-assisted process; the effects of the annealing temperature and time were deeply investigated. Morphological and structural characterizations were performed by scanning electron microscopy and Raman spectroscopy. The analyses showed the rutile structure of the TiO₂ nanowires. The photocatalytic properties were studied through the degradation of methylene blue (MB) dye under UV light irradiation. The nanowires induced an enhancement of the photo-degradation rate, compared to TiO₂ in a bulk form, due to an increase in the surface area. Moreover, the presence of a nano-porous Pt layer deposited on the rear side of the samples provided a further increase in the MB degradation rate, related to the scavenging effect of Pt nanoparticles. The overall increment of the photo-activity, due to the nano-structuration of the TiO₂ and to the presence of the Pt layer, resulted a factor 7, compared to the bulk reference. In addition, photovoltage measurements allowed to assess the effects of TiO₂ nano-structuration and Pt nanoparticles on the electron accumulation.     

光化学法合成银纳米线及其形成机理的研究

结合晶种法和光化学还原法,在聚乙烯吡咯烷酮(PVP)的诱导下成功地制备出直径为50～120nm,长度约为50μm的银纳米线以及银的树枝状纳米结构．实验表明各种反应条件如聚乙烯吡咯烷酮和硝酸银的摩尔比、晶种的加入量及反应时间等对纳米产物的形貌有影响．根据实验结果提出了一种新的银纳米线的形成机理．     

反相微乳法合成稀土六铝酸盐催化剂及其表征

反相微乳法合成稀土六铝酸盐催化剂及其表征;反相微乳法;甲烷;六铝酸盐;过渡金属;稀土     

钨酸锌纳米结构的水热合成及其光催化性能研究

使用柠檬酸钠辅助的水热法合成了具有不同形貌的ZnWO4(如片状、花状)纳米颗粒,并采用X-射线粉末衍射(XRD)、场发射扫描电子显微镜(FESEM)、高分辨透射电子显微镜(HRTEM)等方法对样品的结构和组成进行表征。研究了溶剂组分和溶液pH值对产物形貌的影响。通过对反应产物形貌随时间变化的观察,提出了片状和花状ZnWO4纳米颗粒可能的生长机理。以罗丹明B(RhB)为催化降解对象,对样品在水溶液中的光催化性质进行了研究。结果表明,ZnWO4纳米颗粒的比表面积和孔径尺寸等结构特性对其光催化活性具有明显影响。     

反相微乳液法合成SrTiO3纳米棒

SrTiO₃ nanorods were synthesized in cetanyl trimethyl ammonium bromide (CTAB) reverse microemulsion containing CTAB, n-hexanol, n-octane and water with Ba(OH)₂ as reactants. The effects of different conditions such as ω₀ [ω₀=n_H2O/ n_CTAB], aging time and the concentration of reactants on the formation of the nanorods were studied. Transmission electron microscope (TEM), electron diffraction (ED) and X-ray diffraction(XRD)were used to characterize the morphology and the structure of the synthesized nanorods. The results show that SrTiO₃ nanorods with a length of 260～2 000 nm and a diameter of 50～100 nm belonging to single crystal are single cubic system. The molar ratio of Sr to Ti of products is 1.0 as determinded by ICP.