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Investigation of tribological properties of composite C_(60)-LB films

机译：复合C_（60）-LB薄膜的摩擦学性能研究

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摘要

Composite C_(60)-LB films were fabricated by the Langmuir-Blodgett (LB) technique, their micro-structures, micro- and macro-tribological properties were investigated using atomic force microscope/friction force microscope (AFM/FFM). The results showedthat in the confined C_(60)-LB films there were two kinds of structures for the special C_(60) assembly: grain diameters of one kind were in the range of 150 — 230 nm; the other was smaller than 20 nm. Micro-tribological studies showed that topographical images of tiny C_(60) aggregates (<20 nm) were consistent with their frictional ones very well, namely, low friction occurred on tiny C_(60) aggregates compared with fatty chains LB monolayer, and 'Micro-rolling effect' was apparent; but for big largeones frictional forces were relatively high and 'ratchet mechanism' was seen apparently. Macro-tribological data proved large C_(60) aggregates had wear resistance and load-carrying capacities and anti-wear lives for composite C_(60)-LB films were prolonged greatly with dis-persibility of C_(60) improved and its grain diameter reduced. Tiny C_(60) aggregates were mainly the lubricating agents. Friction coefficients of composite C_(60)-LB films gradually reduced with loads increasing having the same friction coefficient-load relations with boundary lubrication films.
机译：采用Langmuir-Blodgett（LB）技术制备了复合C_（60）-LB薄膜，并用原子力显微镜/摩擦力显微镜（AFM / FFM）研究了它们的微观结构，微观和宏观摩擦学性能。结果表明，在受限的C_（60）-LB薄膜中，有两种特殊的C_（60）组装结构：一种粒径在150-230 nm范围内；另一种在150-230 nm范围内。另一个小于20 nm。微摩擦学研究表明，微小的C_（60）聚集体（<20 nm）的地形图与它们的摩擦非常吻合，即与脂肪链LB单层相比，微小的C_（60）聚集体发生了低摩擦，并且'微滚动效果明显。但是对于大的大个子，摩擦力相对较高，显然可以看到“棘轮机构”。宏观摩擦学数据表明，大的C_（60）聚集体具有耐磨性和承载能力，复合C_（60）-LB膜的耐磨寿命大大延长，C_（60）的分散性得到改善，其晶粒直径减少。微小的C_（60）聚集体主要是润滑剂。复合C_（60）-LB膜的摩擦系数随着载荷的增加而逐渐减小，与边界润滑膜的摩擦系数-载荷关系相同。

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