Preparation and Tribological Studies of Stearic Acid Self-Assembled Monolayers on Polymer-Coated Silicon Surface

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	Preparation and Tribological Studies of Stearic Acid Self-Assembled Monolayers on Polymer-Coated Silicon Surface
	Ren SL; Yang SR; Wang JQ; Liu WM; Zhao YP(赵亚溥)
刊名	Chemistry of Materials
	2004
通讯作者邮箱	sryang@ns.lzb.ac.cn
卷号	16 期号:3 页码:428-434
ISSN号	0897-4756
通讯作者	Yang, SR (reprint author), Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China.
中文摘要	We present a good alternative method to improve the tribological properties of polymer films by chemisorbing a long-chain monolayer on the functional polymer surface. Thus, a novel self-assembled monolayer is successfully prepared on a silicon substrate coated with amino-group-containing polyethyleneimine (PEI) by the chemical adsorption of stearic acid (STA) molecules. The formation and structure of the STA-PEI film are characterized by means of contact-angle measurement and ellipsometric thickness measurement, and of Fourier transformation infrared spectrometric and atomic force microscopic analyses. The micro- and macro-tribological properties of the STA-PEI film are investigated on an atomic force microscope (AFM) and a unidirectional tribometer, respectively. It has been found that the STA monolayer about 2.1-nm thick is produced on the PEI coating by the chemical reaction between the amino groups in the PEI and the carboxyl group in the STA molecules to form a covalent amide bond in the presence of N,N'-dicyclohexylcarbodiimide (DCCD) as a dehydrating regent. By introducing the STA monolayer, the hydrophilic PEI polymer surface becomes hydrophobic with a water contact angle to be about 105degrees. Study of the time dependence of the film formation shows that the adsorption of PEI is fast, whereas at least 24 h is needed to generate the saturated STA monolayer. Whereas the PEI coating has relatively high adhesion, friction, and poor anti-wear ability, the STA-PEI film possesses good adhesive resistance and high load-carrying capacity and anti-wear ability, which could be attributed to the chemical structure of the STA-PEI thin film. It is assumed that the hydrogen bonds between the molecules of the STA-PEI film act to stabilize the film and can be restored after breaking during sliding. Thus, the self-assembled STA-PEI thin film might find promising application in the lubrication of micro-electromechanical systems (MEMS).
学科主题	力学
类目[WOS]	Chemistry, Physical ; Materials Science, Multidisciplinary
研究领域[WOS]	Chemistry ; Materials Science
关键词[WOS]	RAY PHOTOELECTRON-SPECTROSCOPY ; PHASE CHEMICAL DERIVATIZATION ; LATERAL FORCE MICROSCOPY ; FRICTIONAL-PROPERTIES ; MULTILAYER FILMS ; STRUCTURAL-CHARACTERIZATION ; NANOTRIBOLOGICAL PROPERTIES ; MECHANICAL-PROPERTIES ; MOLECULAR SIMULATION ; ADSORBED DENDRIMERS
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000188804700011
公开日期	2007-06-15 ; 2007-12-05 ; 2009-06-23
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/16459]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Ren SL,Yang SR,Wang JQ,et al. Preparation and Tribological Studies of Stearic Acid Self-Assembled Monolayers on Polymer-Coated Silicon Surface[J]. Chemistry of Materials,2004,16(3):428-434.
APA	Ren SL,Yang SR,Wang JQ,Liu WM,&赵亚溥.(2004).Preparation and Tribological Studies of Stearic Acid Self-Assembled Monolayers on Polymer-Coated Silicon Surface.Chemistry of Materials,16(3),428-434.
MLA	Ren SL,et al."Preparation and Tribological Studies of Stearic Acid Self-Assembled Monolayers on Polymer-Coated Silicon Surface".Chemistry of Materials 16.3(2004):428-434.