COLL 318 |
| Hideomi Ishida, Hideyuki Otsuka, and Atsushi Takahara. Institute for Materials Chemistry and Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan |
| The ability to control directional friction properties of an interface is of great interest to both nanotechnology and macroscale applications. Organosilane monolayers are novel robust ultrathin films to control physicochemical properties of solid surfaces. The alkylsilane and fluoroalkylsilane monolayers with a series of chain lengths were prepared on the Si-wafer substrate by chemical vapor adsorption (CVA) process. Lateral force microscopic(LFM) measurements showed that alkylsilane monolayers gave lower lateral force than Si substrate surface. The lateral force decreased with increasing the length of the alkyl chain. The macroscopic sliding friction measurement revealed that the organosilane monolayers gave lower dynamic friction coefficient than Si-wafer substrate surface in air at room temperature. The micropatterned (alkylsilane/fluoroalkylsilane) monolayers were prepared from the alkyl- and fluoroalkyl-silanes with similar chain length by CVA and vacuum ultraviolet (VUV)-ray photodecomposition under line-pattern photomask. The dynamic sliding friction measurement revealed that the dynamic friction coefficient along the line parallel was smaller than that the one perpendicular to the line. It was revealed that the anisotropic friction can be realized through the micropatterned surface with different friction coefficient components. |
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Friction, Lubrication, and Adhesion in Micro- and Nano-Scale Devices
8:30 AM-12:00 PM, Tuesday, March 30, 2004 Marriott -- Orange County 5, Oral
Division of Colloid and Surface Chemistry |