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Thermo-responsive graphene dispersions by liquid phase exfoliation of graphite aided by an alkylated Percec monodendron

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Science China Materials 2017年第4期60卷 343-351页

作者： Keyang Yin College of Materials Science and Engineering Liaocheng University Liaocheng 252059 China State Key Laboratory of Solid Lubrication & Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049 China

Large-scale production of graphene and sub- sequent sample engineering is the key for fully-realizing the potential applications proposed to this intriguing two-dimensional nanomaterial. Herein, smart graphene dispersions with low defects and thermo-responsive properties can be obtained by liquid phase exfoliation of graphite using an alkylated Percec monodendron （3,4,5-trioctadecy- loxybenzaldehyde, 1） as the stabilizing reagent. By simply changing the temperature, the dispersed graphene and 1 can be detached, leading to the recovery of both components. Besides noncovalent wrapping, the stabilizing reagent 1 can be also covalently attached to graphene through [3＋2] cycloaddition. The covalently functionalized graphene sheets show improved dispersibility in organic solvents compared to the pristine graphene, which opens the door for their applications in various polymer matrixes. The strategy demonstrated here provides a new methodology to get smart graphene dispersions with multiple functions.

关键词： graphene thermo-responsive liquid phase exfoliation alkylated cycloaddition

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The action and analysis of magnetic field on the lubricants and wear products in the process of wearing

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Science China Mathematics 2001年第S1期44卷 267-272页

作者： ZHOU Qiang XU Ruiqing Mechanical Engineering College, China Agriculture University, Beijing 100083, China China Agr Univ Mech Engn Coll Beijing 100083 Peoples R China

The magnetic field is an important factor in the conditioning and controlling tribologicalproperty. This paper analyzes and describes the physical effects and chemical natures of magneticfield to affect the friction, wear and lubrication, and characterize the tribochemical effect of mag-netic field on WRL lubricant by infrared(IR) spectrum method. At same time, the tribological prop-erty of WRL lubricant was examined by using the reciprocating friction-wear tester of NG-x type inthe condition of magnetic field. The results show that the present of magnetic field can decreasethe friction coefficient(f) and wear weight(W), even realize the zero-wear testing situation.

关键词： magnetic field friction and wear lubricant boundary film micro-particles alkylated metal micro-debris

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