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用三种不同的方法将巯基丙基三甲氧基硅烷(MPTMS)引入二氧化硅网络中, 合成了粒径为50-200 nm的巯丙基功能化的介孔纳米二氧化硅, 并利用透射电子显微镜, 热重分析等手段对其形貌与性能进行了表征. 在巯丙基官能团的作用下介孔纳米二氧化硅的形貌发生了重大改变, 由非常规则的六角形变为纳米棒. 控制反应时间可以调节介孔纳米二氧化硅的粒径大小, 用三乙醇胺代替氢氧化钠可以合成直径在100 nm以下的功能化介孔二氧化硅粒子. 为了保护巯基官能团, 选用了酸醇提取法去除模板. 另外, 对介孔二氧化硅粒子的形成机制也进行了探讨. 相似文献
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In the presence of stearic acid, the surface modified Pb-Sn alloy nanoparticles were prepared through the liquid phase dispersion method in liquid paraffin. The morphologies and structures of the material were characterized by TEM, XRD, DTA and TG. The results indicate that the samples have an average diameter of 20 nm, with Pb-Sn structure and oxide shell, and have at least 12% organic covered layer. The tribology test indicates that, when the concentration of Pb-Sn alloy nanoparticles as additives in lubricating oil is between 0.25%~0.75%, the improved tribological properties are achieved. 相似文献
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