Measurement of Adhesion Force and Elongation of Molecularly Thin Lubricant by Using Transient Response of SPM Cantilever
Author:
Ohshima Yasuji1, Mitsuya Yasunaga2, Iwase Yusuke3
Affiliation:
1. Aichi Konan College, Liberal Arts Department, 172, Omatsubara, Takaya-cho, Konan 483-8086, Japan 2. Nagoya University, Department of Micro System Engineering, Furo-cho Chikusa-ku Nagoya 464-8603, Japan 3. Matsushita Electric Industrial Co., Ltd., Lighting Company, Production System Development Group, 1-1 Saiwai-cho, Takatsuki, Osaka 569-1143, Japan
Abstract
A novel method for identifying the adhesion force and dynamic elongation of molecularly thin lubricant coated over a DLC (diamond-like-carbon) surface was developed, in which those values were determined through the regression analysis of transient responses of an SPM (scanning probe microscopy) cantilever arising while separating from the target surface. The accuracy of measuring the cantilever displacement was greatly improved by mounting a silicon plate onto the cantilever as an optically reflective surface to produce a high quality image of the interference fringe pattern formed by Michelson interferometry. To analyze experimental transient vibration, a model to describe the separation process was introduced wherein the surface force decreases in proportion to the tip travel distance accompanying lubricant bridging. Based on this model, the adhesion force (contact force) and elongation of the lubricant were measured with varying retracting velocities. The results revealed that the contact force depends slightly on the velocity, and the lubricant elongates by several tens of times’ its original lubricant thickness.
Publisher
ASME International
Subject
Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials
Reference7 articles.
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