Influence of Salt on the Aqueous Lubrication Properties of End-Grafted, Ethylene Glycol-Based Self-Assembled Monolayers

被引：41
|
作者：
Heeb, Raphael [1 ]
Lee, Seunghwan [1 ]
Venkataraman, Nagaiyanallur V. [1 ]
Spencer, Nicholas D. [1 ]
机构：
[1] ETH, Surface Sci & Technol Lab, Dept Mat, CH-8093 Zurich, Switzerland
来源：
ACS APPLIED MATERIALS & INTERFACES | 2009年 / 1卷 / 05期
关键词：
aqueous lubrication; self-assembled monolayer (SAM); poly(ethylene glycol); salting out; poly(dimethylsitoxane); ATOMIC-FORCE MICROSCOPY; QUARTZ-CRYSTAL MICROBALANCE; ALKYL CHAIN-LENGTH; POLY(ETHYLENE OXIDE); PROTEIN ADSORPTION; TRIBOLOGICAL BEHAVIOR; FRICTIONAL-PROPERTIES; BRUSHLIKE COPOLYMER; INORGANIC SALTS; SURFACE;
D O I：
10.1021/am900062h
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We have investigated the influence of a high-concentration salt solution (1 M NaCl) on the aqueous lubrication properties of ethylene glycol-based molecules, namely, alpha-methoxy-omega-mercaptopoly(ethylene glycol) (MW 5000 Da) and CL-methoxy-omega-mercaptoheptakis(ethylene glycol) (MW 356 Da), which have been end-grafted onto polycrystalline gold surfaces at high surface density. Macroscopic-scale, yet nondestructive, pin-on-disk tribometry experiments revealed that a high concentration of sodium chloride is deleterious to the aqueous lubricating properties of both films under low-sliding-speed conditions. This behavior was observed to be closely associated with the more collapsed conformation of surface-grafted poly(ethylene glycol) polymer chains in concentrated salt solutions, as confirmed by quartz-crystal microbalance measurements.
引用
收藏
页码：1105 / 1112
页数：8
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