Knowledge Management System of Institue of Mechanics, CAS
| 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); Yang, SR (reprint author), Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China.
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| Source Publication | Chemistry of Materials
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| 2004 | |
| Volume | 16Issue:3Pages:428-434 |
| ISSN | 0897-4756 |
| Abstract | 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). |
| Subject Area | 力学 |
| DOI | 10.1021/cm0345669 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000188804700011 |
| WOS Keyword | RAY PHOTOELECTRON-SPECTROSCOPY ; PHASE CHEMICAL DERIVATIZATION ; LATERAL FORCE MICROSCOPY ; FRICTIONAL-PROPERTIES ; MULTILAYER FILMS ; STRUCTURAL-CHARACTERIZATION ; NANOTRIBOLOGICAL PROPERTIES ; MECHANICAL-PROPERTIES ; MOLECULAR SIMULATION ; ADSORBED DENDRIMERS |
| WOS Research Area | Chemistry ; Materials Science |
| WOS Subject | Chemistry, Physical ; Materials Science, Multidisciplinary |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/16459 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Yang, SR (reprint author), Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China. |
| Recommended Citation 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,&Yang, SR .(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. |
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