排序方式: 共有18条查询结果,搜索用时 15 毫秒
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分别使用硬脂酸、油酸、乙二胺四乙酸、聚乙二醇等对硼酸钙进行表面改性,制备了多种具有不同疏水性的纳米硼酸钙润滑油添加剂;进而,通过扫描电镜、傅里叶变换红外光谱、摩擦试验等方法系统研究了改性纳米硼酸钙对菜籽油抗磨、减摩性能的影响.结果表明:在各种表面改性纳米硼酸钙中,硬脂酸改性硼酸钙的疏水性最佳,油酸改性硼酸钙的疏水性次之... 相似文献
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以表面增强拉曼光谱分析法对多环芳烃的快速检测为切入点,对多环芳烃传统检测方法及新型快速分析方法进行分析,对传统检测方法及新型检测方法的优缺点进行概述,对2008至2020年SERS检测多环芳烃研究现状进行分析,并对1996至2020年有关拉曼光谱分析多环芳烃研究领域文献产出量进行分析,对应用SERS技术研究PAHs文献进行了统计,总结了目前应用SERS检测多环芳烃中存在检测过程中荧光的干扰、SERS基底材料和表面形貌的普适性差、缺乏PAHs理论计算等问题,并针对性地提出意见建议。 相似文献
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Oleic acid (denoted as OA) surface-capped lanthanum-doped titanium dioxide composite nanoparticles,abbreviated as OA/La-TiO2,were prepared via sol-gel method in association with surface modification by oleic acid.The microstructure of as-prepared OA/La-TiO2 was characterized by means of X-ray diffraction,scanning electron microscopy and Fourier transform infrared spectrometry,and their thermal stability was evaluated by thermogravimetry and differential scanning calorimetry.Moreover,the tribological properties of OA/La-TiO2 as lubricant additives in rapeseed oil were evaluated with a four-ball friction and wear tester.The morphology as well as elemental composition and chemical characteristics of worn steel surfaces was investigated by scanning electron microscopy,energy dispersive X-ray spectrometry and X-ray photoelectron spectroscopy.Results showed that as-prepared OA/La-TiO2 particles were of spherical shape and had an average diameter of 20 nm.In the meantime,OA/La-TiO2 particles doped with 1.5% (molar ratio;the same hereafter) and 2.5% of lanthanum could markedly improve the anti-wear and friction-reducing capacities of rapeseed oil.This is attributed to the formation of a complex boundary lubrication film mainly composed of the oxides of iron,titanium and lanthanum as well as the formation of an adsorption film of oleic acid on steel sliding surfaces. 相似文献
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采用水热法制备了油酸修饰的硼酸镧纳米片,记为OA/ LaBO3?H2O,利用SEM、 TEM、EDS、 FTIR 和XRD对其微结构进行了表征,在四球摩擦试验机上评价了其在菜籽油中的摩擦磨损性能,并利用SEM与XPS对磨损表面的摩擦化学特征进行了研究。结果表明:硼酸镧呈纳米片结构,其直径为100 ~ 300 nm、厚度约为25 nm;OA/ LaBO3?H2O在菜籽油中显示了优异的分散稳定性,添加OA/ LaBO3?H2O的菜籽油能显著降低钢球的摩擦与磨损,当OA/ LaBO3?H2O的添加浓度为1%(质量浓度)时,菜籽油的减摩抗磨性能最佳。这是由于在摩擦表面形成了一层由B2O3、La2O3、Fe2O3摩擦化学反应物,OA/ LaBO3?H2O沉积物和菜籽油吸附物组成的边界润滑膜。 相似文献
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