Reduction of Friction at Oxide Interfaces upon Polymer Adsorption from Aqueous Solutions
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- 作者：Xiaoping Yan ; Scott S. Perry ; Nicholas D. Spencer ; Sté ; phanie Pasche ; Susan M. De Paul ; Marcus Textor ; and Min Soo Lim
- 刊名：Langmuir
- 出版年：2004
- 出版时间：January 20, 2004
- 年：2004
- 卷：20
- 期：2
- 页码：423 - 428
- 全文大小：84K
- 年卷期：v.20,no.2(January 20, 2004)
- ISSN：1520-5827
文摘
Reduction of the interfacial friction for the contact of a silicon oxide surface with sodium borosilicatein aqueous solutions has been accomplished through the adsorption of poly(L-lysine)-graft-poly(ethyleneglycol) on one or both surfaces. Spontaneous polymer adsorption has been achieved via the electrostaticattraction of the cationic polylysine polymer backbone and a net negative surface charge, present for aspecific range of solution pH values. Interfacial friction has been measured in aqueous solution, in theabsence of wear, and on a microscopic scale with atomic force microscopy. The successful investigation ofthe polymer-coated interfaces has been aided by the use of sodium borosilicate microspheres (5.1 
mdiameter) as the contacting probe tip. Measurements of interfacial friction as a function of applied loadreveal a significant reduction in friction upon the adsorption of the polymer, as well as sensitivity to thecoated nature of the interface (single-sided versus two-sided) and the composition of the adsorbed polymer.These measurements demonstrate the fundamental opportunity for lubrication in aqueous environmentsthrough the selective adsorption of polymer coatings.
mdiameter) as the contacting probe tip. Measurements of interfacial friction as a function of applied loadreveal a significant reduction in friction upon the adsorption of the polymer, as well as sensitivity to thecoated nature of the interface (single-sided versus two-sided) and the composition of the adsorbed polymer.These measurements demonstrate the fundamental opportunity for lubrication in aqueous environmentsthrough the selective adsorption of polymer coatings.