改进的种子聚合——单分散交联聚苯乙烯微球的合成

本文结合了种子聚合法和二步溶胀法的特点,提出用改进的种子聚合法以合成粒径大于3微米、粒度呈单分散的交联聚苯乙烯微球。文中采用的粒径为1—2微米的聚苯乙烯胶乳种子是由无皂乳液聚合法制备的。文章研究了溶胀温度、溶胀剂比例、溶胀时间、交联剂、小分子化合物及表面活性剂等因素对生成微球的粒径和分散性的影响。     

三缺位杂多化合物K_8［P_2W_（18）Mo_2Co_2（H_2O）_2O_（68）］·MoO_6·15H_2O的合成、结构及催化H_2O_2分解研究

合成了杂多化合物Ｋ８［Ｐ２Ｗ（１８）Ｍｏ２Ｃｏ２（Ｈ_２Ｏ）２Ｏ（６８）］·ＭｏＯ６·１５Ｈ２Ｏ，依据ＸＲＤ、ＩＲ、ＵＶ－Ｖｉｓ及ＸＰＳ确定了其晶体结构和配位原子价态，考察了该化合物催化Ｈ２Ｏ２分解的动力学行为。     

石英芯片电泳分离检测尿中蛋白的研究

通过对缓冲体系、缓冲液浓度、酸度、乳酸钙浓度、乙胺浓度、电泳电压和进样时间的优化选择，用石英芯片电泳一紫外检测法分离了纯人白蛋白和人运铁蛋白；在75mmol／L硼酸盐（pH10．55）（含0．8mmol／L乳酸钙、1％（φ）乙胺）运行缓冲液中，上述两组分在3min内完全分离；纯人白蛋白和人运铁蛋白的线性范围分别为1．0～15．0g/L和1．0～10．0g／L；检出限（S／N=3）均为0．5g／L，应用于临床尿蛋白分离测定，并与Helena琼脂糖凝胶电泳仪电泳结果进行比较，获得一致结果。     

CdTe纳米晶与苯丙氨酸相互作用的研究

以巯基乙酸为稳定剂,在水相中合成了CdTe纳米晶,通过考察红外光谱、紫外光谱和光致发光光谱的变化,确定了苯丙氨酸(Phe)对CdTe纳米晶的光致发光效率以及稳定性的影响.结果表明苯丙氨酸与CdTe纳米晶之间存在着较强的相互作用,这种作用导致CdTe纳米晶的发光强度增大,稳定性增强,苯丙氨酸不仅是配位剂,它同时又起到了稳定剂的作用,并初步确认这种加强和稳定作用来自于苯丙氨酸和CdTe纳米晶之间所形成的配位键和静电作用以及苯丙氨酸与巯基乙酸之间形成的氢键.此外,苯丙氨酸的特殊结构对防止纳米晶的聚集有很大作用.     

男性型秃发患者发中K,Na,Ca,Mg元素含量分析

采用火焰原子吸收法对３０例男性型秃发患者及３８例毛发健康男性对照者发中宏量元素Ｋ、Ｎａ、Ｃａ、Ｍｇ的含量进行了测定。结果表明，男性型秃发患者发Ｋ含量明显高于对照组，具有统计学上的显著差异（Ｐ〈０．０１）。发Ｎａ、Ｃａ、Ｍｇ含量在两组间未见显著差异（Ｐ〉０．０５）。本文提示，体内某些宏量元素变化对男性型秃发可能产生一定影响。     

Enantioseparation of Novel Chiral Tetrahedral Clusters on a Chiral Stationary Phase (CSP) by High Performance Liquid Chromatography

In recent years, the synthesis of chiral tetrahedral clusters has been studied extensively and various types are accessible , which are a kind of organometallic compounds with greatly growing interest due to their potential application to asymmetric reaction catalysts. As an efficient     

高介电常数TiO2纳米晶的表面态研究

将钛酸四丁酯和硬脂酸在熔融状态下混合均匀后置于冷水浴中,使其凝固成凝胶,通过控制烧结过程中氧气的含量,成功地制备出粒度均匀、介电性能好的纳米晶TiO2.通过采用X射线光电子能谱和表面光电压谱对纳米晶TiO2表面状态的分析发现,材料表面存在大量的氧空位缺陷,暴露在粒子表面上的主要是一些金属Ti4+.纳米材料的这种表面状态对其极化性质具有重要的影响,使其在接近静态条件下的低频介电常数远大于常规材料的介电常数.     

Rapid Fabrication of Hollow SiO2 Spheres with Novel Morphology

The hydrolysis of tetraethoxysilane (TEOS) occurred on the surface of poly(methyl methacrylate) (PMMA) microshperes immediately after these microshperes were prepared in TEOS. Micron-sized hollow SiO2 spheres were obtained by calcination of the coated PMMA microshperes. It was found that the final hollow spheres were constituted by small SiO2 particles.     

Characteristics of hyaluronate-hydroxyethyl acrylate blend gel and release of cationic amphiphilic solutes

Hyaluronate-hydroxyethyl acrylate blend gel (HA-PHEA) were prepared to modify the brittleness of hyaluronate gel (HA) and the characteristics of HA-PHEA gel were compared with those of HA and polyhydroxyethyl acrylate (PHEA) gels. These gels were high in water content and transparent. HA-PHEA gel was improved in viscoelastic properties due to the elasticity and the high affinity with water of PHEA, and the drying-swelling cycles became reversible. The effective charge densities theta of the gels estimated from membrane potentials were -0.002, -0.008 and 0 mol dm(-3) for HA-PHEA, HA and PHEA gels. Effects of electro- static and nonelectrostatic interactions on absorptions and releases were studied using sodium benzoate (NaBA) as an anionic solute, and methylene blue (MB), chlorpromazine (CPHCl) and benzethonium chloride (BZTCl) as cationic solutes, in which CPHCl and BZTCl are cationic amphiphilic solutes. The releases of MB, CPHCl and BZTCl from HA-PHEA and HA gels were suppressed comparing with those of NaBA. By adding salts, the releases of MB and CPHCl were enhanced but those of BZTCl were suppressed due to enhancement of the intra- and intermicelle formation. In the releases of the cationic solutes from HA-PHEA gel, electrostatic and nonelectrostatic interactions with HA were found to play important roles. Behaviors of the releases from HA-PHEA gel were found to possess the features of HA gel.     

河口水体中痕量稀土元素的共沉淀预富集-电感耦合等离子体质谱法测定研究

建立了氢氧化铟共沉淀预富集 -电感耦合等离子体质谱法测定河口水体中痕量稀土元素的方法。实验结果表明 ,在80mg·L -1的In3 +和pH9.5的实验条件下 ,在1.0L水样中添加5.0～200.0ng的混合稀土标准溶液 ,均能定量回收 ,回收率在82.2 %～106.9 %之间。方法的分析流程空白为0.04(Tb)～10.17(La)ng·L -1,检出限在0.17(Yb)～1.46(La)ng·L-1之间 ,精密度 (RSD ,n=3)小于11.7 % ,可满足河口淡水和海水样品中的痕量稀土元素定量分析的要求