可用于涂料消光剂的大孔容纳米介孔二氧化硅的制备

本文采用价格低廉的水玻璃为原料,在不使用表面活性剂的情况下通过溶胶-凝胶法合成了大孔容纳米介孔二氧化硅,对合成条件进行了研究,结果表明:合成的介孔二氧化硅孔道呈蠕虫状,孔径大小均匀。颗粒的平均粒径为2.5μm。较优的合成条件下,实验产品的各项指标与消光粉805相当。本文提出的工艺成本低,易放大,有很大的推广价值。     

硅系消光剂的制备及其在UV双固化涂料体系中的应用

通过有机化处理沉淀法制备SiO2,使其具有良好的疏水性和可分散性。采用透射电子显微镜(TEM)、X-射线衍射(XRD)及比表面积测试等表征方法对其结构和性能进行表征。所得的SiO2消光剂用于双固化UV体系中表现出良好的消光性,同时其良好的分散性保证了漆膜低磨损性并赋予表面其它优良的综合物理性能。     

SiO2微球的制备与应用

综述了致密和多孔SiO2微球的制备方法．重点描述了近年来SiO2微球的一些新应用。     

多孔SiO2凝胶玻璃的制备及孔径控制

以正硅酸乙酯（ＴＥＯＳ）为原料，采用溶胶－凝胶法制备了多孔ＳｉＯ２凝胶玻璃，研究了氨水，盐酸，硝酸，氢氟酸等不同种类的催化剂对孔的影响，制备了多孔ＳｉＯ２凝胶玻璃，利用氮气吸附法对孔结构进行了分析。在透射电镜下观察了凝胶颗粒形貌。     

纳米SiO2表面改性及其应用在复合材料中的研究进展

简单介绍了纳米SiO2改性目的及改性机理,对近年来国内外纳米SiO2表面改性方法及聚合物/纳米SiO2复合材料（PSN）的应用进行了阐述,并对未来的研究内容和方向提出了展望。     

硅烷偶联剂在PPy/SiO2纳米导电复合材料制备中的应用

描述了一种合成PPy／SiO2纳米复合材料的新方法。首先用不同百分含量的氨丙基三乙氧基硅烷(APS)处理SiO2,然后通过化学氧化聚合法合成PPy／APS—SiO2纳米复合材料。文中讨论了偶联剂的使用对复合材料的影响及其作用机理。结果表明,用APS处理过的SiO2合成的复合材料其PPy含量、电导率和稳定性都有很大提高,其中用1％APS—SiO2合成的复合材料电导率最高,为38．4S／cm。文中还阐述了偶联剂的预处理对PPy／SiO2纳米复合材料形貌的影响。     

纳米SiO2表面改性及其在复合材料中的研究进展

简单介绍了纳米SiO2改性目的及改性机理，对近年来国内外纳米SiO2表面改性方法及聚合物／纳米SiO2复合材料（PSN）的应用进行了阐述，并对未来的研究内容和方向提出展望。     

纳米SiO2润滑油添加剂的制备

选用正硅酸乙酯为原始材料,制备了应用于润滑油添加剂的纳米二氧化硅.通过正交实验讨论各反应因素对产率的影响,确定了最佳反应条件.利用XRD、TEM、FT-IR测试手段研究了最佳反应条件下制得的二氧化硅的结构和形貌.结果表明二氧化硅为40nm左右的球形,属于无定形结构,表面含有大量的羟基,可在金属表面形成吸附薄膜.     

Preparation of porous supports in the SiO2-ZrO2-Na2O system from microspherical silica gels

Preparation of porous supports in the SiO₂-ZrO₂-Na₂O system was investigated using a commercially available silica gel as a starting material. The microspherical silica gel, impregnated with ZrOCl₂ and NaCl, was heated and subsequently washed with water. Porous supports, composed with sponge-like skeletons on the surface of the particles, were obtained owing to suppression of crystallization of the supports as well as their sintering. Similar supports were formed using a silica gel prepared from sodium silicate solution by the same procedure. In contrast, crystallization of silica proceeded in supports prepared by heating the mixture of silica gel and NaCl in the absence of ZrOCl₂. A new method for preparing the analogous supports was also investigated by heating a mixture of silica gel impregnated with ZrOCl₂ and Na₂CO₃ powder.     

The size effect on micro deformation behaviour in micro-scale plastic deformation

When the geometry of metal deformed part is scaled down to micro-scale, the understanding and prediction of micro deformation behaviour becomes difficult. This is because the conventional material deformation models are no longer valid in micro-scale due to the size effect, which affects the deformation behaviour in micro plastic deformation, and thus leveraging the traditional knowledge of plastic deformation from macro-scale to micro-scale is not meaningful. In this paper, the size effect on micro-scale plastic deformation and frictional phenomenon are investigated via micro-cylindrical compression test, micro-ring compression test and Finite Element (FE) simulation. The experimental results show the occurrence of various size-effect related deformation phenomena, including the decrease of flow stress and the increases of: (a) irrational local deformation, (b) the amount of springback, and (c) the interfacial friction stress with the decreasing specimen size. The research further verifies that the established surface layer models, with the identified surface grain, the internal grain properties and the measured friction coefficients, are able to predict micro deformation behaviour. The research thus provides an in-depth understanding of size effect on deformation and frictional behaviours in micro-scale plastic deformation.     

改性无机高分子SiO2溶胶外墙涂料

采用自制改性硅溶胶,经复配得到无机水性涂料,主要性能指标优于国家无机外墙涂料标准,干燥时间小于4h,与有机涂料相比,干燥时间大大缩短。合理控制涂料pH和施工温度,可赋予涂料一定的环境协调能力。     

Elastic and plastic relaxation of densified SiO2 films

Ion- and plasma-assisted deposition has been extensively used for the fabrication of high-performance optical films with dense and smooth microstructures that are essential for applications such as low-loss and environmentally stable optics. SiO(2) is a well-known amorphous material suitable for energetic deposition. SiO(2) single layers and SiO(2)-based single-cavity narrow-bandpass filters were prepared by plasma-ion-assisted deposition. The refractive index and film thickness were determined by variable-angle spectroscopic ellipsometry. The high compressive stress of the densified film was correlated to increased packing density. The center wavelength shift of the narrow-bandpass filters as a function of sample-temperature as well as high-temperature annealing was determined via spectral transmission measurement. Structural relaxation of the densified SiO(2) films was observed from the variation of the refractive index and physical thickness for the single layers and the center wavelength shift for the narrow-bandpass filters, suggesting elastic and plastic deformation of the densified films corresponding to a reversible and an irreversible center wavelength shift, respectively.     

SiO2f/SiO2-BN复合材料的制备及其性能

以石英纤维预制件和硅溶胶为原料,采用溶胶-凝胶法制备了SiO2f/SiO2复合材料,在此基础上用尿素法制备了SiO2f/SiO2-BN复合材料,并对其力学性能和介电性能进行了测试.结果表明,随着工艺循环次数的不断增加,复合材料的密度随之提高,但增长速度逐渐减慢.三次循环后,SiO2f/SiO2-BN复合材料密度达1.8...     

纳米SiO2/苯丙乳液的合成及其乳胶漆的研制

纳米SiO2 存在下 ,以苯乙烯、丙烯酸丁酯、甲基丙烯酸聚合成乳液 ,然后制备出乳胶漆。对制得的乳液及其涂料进行了测试实验 ,并讨论了纳米SiO2 用量对乳液及涂料性能的影响。     

单分散纳米二氧化硅的制备

以正硅酸乙酯为原料,氨水为催化剂,采用化学沉淀法,通过合理地控制反应条件,制备了单分散球形纳米二氧化硅颗粒。通过激光粒度分析、X射线衍射及透射电镜等测试手段对制备的二氧化硅颗粒进行表征。结果表明:当最佳试验条件为正硅胶乙酯与乙醇、氨水的物质的量为1∶6∶4,表面活性剂的添加量为3%时,制备的纳米氧化硅粒度分布均匀,且呈规则的球形,粒径为50~90 nm,为无定形态二氧化硅。     

具有微/纳多孔结构的海胆状NiO的制备及其比容量研究

以六水合氛化镍和尿素为原料,利用水热合成法制备了具有徽/纳多孔结构的海胆状NiO的前驱物,经热处理后得到了具有微/纳多孔结构的海胆状NiO微球.通过XRD,SEM,H RTRM和N2-吸附-脱附对制得的NiO微球进行了表征,结果显示表面具有5-20nm微孔的海胆状NiO微球由许多直径3040nm的纳米线组装而成,其比表...