Abstract
Additives have a very important role in engines, molding process, printings and in a wide variety of engineering. Some additives form an adsorbed layer on a solid surface. These layers enhance protection of the surface and/or reduce friction force. Therefore it is important to know a formation process of it and its physical properties. Quartz crystal microbalance (QCM) has been known as a sensitive mass-measuring device. And, QCM has been used to monitor the physical properties of thin liquid film on its surface. The resonant frequency of the quartz crystal is dependent on the viscosity and the density of the liquid film. By using this relation, QCM allows one to evaluate viscoelastic properties of adsorbed layer on a surface. In this work, QCM was applied to study the formation process of the adsorbed layers by additives and evaluate its physical properties. Especially, we focused on the contact area and its position of a sample droplet on an electrode surface of QCM.
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