【作者】 王哲；

【导师】 金美花；

【作者基本信息】 大连海事大学 ， 材料科学与工程， 2016， 硕士

【摘要】 润滑是用来降低摩擦阻力减缓磨损的技术措施,一般通过润滑剂来达到润滑的目的。水合润滑因水的环保介质、高效的润滑效率在近十几年来得到广泛的研究。脂质体水合效率高、密排单室脂质体膜已经展现出优异的润滑性能。本文综合多种工艺方法设计并制备了不同结构尺寸的脂质体膜,考察了脂质体膜表面微观结构对润滑性能产生的影响,主要内容有:(1)以玻璃为基底,综合薄膜分散法、超声波分散法、膜挤压法、离心法等方法获得了微米级结构脂质体膜、微纳米复合结构脂质体膜、纳米级结构脂质体膜以及磷脂平滑膜,并相应的对比了不同的制备工艺对脂质体膜结构的影响。通过酸性腐蚀法制备了一系列不同粗糙度的玻璃基底,并在其上附着脂质体膜,用以考察基底粗糙度对脂质体润滑性能的影响。(2)通过摩擦实验考察了脂质体膜的润滑性能。结果表明,脂质体膜在水润滑下的摩擦系数相比干摩擦时摩擦系数下降15%～67%,说明脂质体可以在水中进行更有效的润滑;磷脂平滑膜、微米级结构和微纳米复合结构的脂质体膜的摩擦系数逐渐下降,微纳米复合结构在水润滑下展现出最好的润滑效果,这是由于脂质体具有牢固的囊泡结构,可以承受高压和高剪切力,脂质体尺寸越小,结构越稳定;粗糙玻璃基底上制备的脂质体膜相比光滑玻璃基底,干摩擦下摩擦系数上升38%～50%,水润滑下摩擦系数上升16%～24.6%,而且粗糙基底的脂质体膜在干摩擦和水润滑下表面出的稳定性更差,显然刚性的粗糙基底结构影响了脂质体的润滑效率。脂质体膜的水下浸润性研究表明,微纳米复合结构脂质体膜表现出最高的水下油接触角和较低水下油滚动角,脂质体膜水下油的浸润性结果与水合润滑的具有相似的规律。更多还原

【Abstract】 Lubrication is a measure to reduce the friction and wear,and the lubrication is generally achieved through the lubricant.Hydrated lubricating for its environmentally friendly media,and high lubrication efficiency has been widely studied in recent years.Liposomes possess high hydration efficiency,and close-packed unilamellar vesicles liposome membrane exhibits excellent lubricating properties.In this paper,a variety of methods were designed to prepare different sizes of liposomes membrane.The effect of the surface microstructure of the liposome membrane to its lubrication properties was investigated.The main contents of this paper are as follows:(1)Glass substrate,integrated methods of thin film dispersion method、ultrasonic dispersion、film extrusion method and centrifugal method,prepared smooth phospholipids membrane,micron-sized liposome membrane structure,micro-nano liposome membrane,nano liposome membrane,and also compared different preparation technology effect on the structure of liposome membrane.A series roughness of glass substrates were prepared by acid etching,to investigate the effect of substrate roughness on the lubrication properties.(2)To compared different structure liposome membrane lubricating properties by friction experiments.The results shows that,compare with dry lubrication,the friction coefficient of the liposome membrane under water is decreased by 15%-67%,indicating under the action of hydration lubrication mechanism liposome more effective lubrication in water;the friction coefficient of the smooth phospholipids membrane,micron liposome membrane and micro-nano structures liposome membrane gradually decline,micro-nano structures liposome membrane has the most efficiency lubrication under water,it is because of liposome vesicles having a strong structure that can withstand high pressure and high shear forces,the smaller size of liposome,the structure will more stable,so that the friction coefficient decreased;compared with the smooth glass substrate,the liposome membrane prepared on glass substrate with different roughness friction coefficient was increased by 38%-50%under the dry friction,and the friction coefficient increased by 16%～24.6%under water lubrication,and the liposome membrane on roughness surface friction whether under dry friction or water lubrication stability even worse,it is obvious the rigidity of the rough substrate structure affects the lubrication efficiency of liposomes.Liposome membrane Wettability study shows that micro-nano liposome membrane performance out of the highest oil contact angles and low oil sliding angle under water,the liposome membrane Wettability results has similar rules with hydration lubrication.更多还原