NDLI: Correlation of Contact Angle Hysteresis and Hydrodynamic Lubrication

Content Provider	Springer Nature Link
Author	Guo, L. Wong, P. L. Guo, F.
Copyright Year	2015
Abstract	The strength of molecular adhesion at the lubricant–solid interface plays a key role in determining the load-carrying and film forming capacity of a lubricated system of meso- or microscale. If the liquid molecules gain higher energies than the potential energy barrier for adhesion, slip occurs at the interface. The contact angle of a liquid on a solid surface is related to the intermolecular attractive force. Some studies demonstrated the connection of the contact angle to the lubrication effect. However, there were also studies drawing the opposite conclusion. A theoretical model derived based on thermodynamic principles shows that the potential energy barrier of a surface is not only a function of contact angle, but also of another interfacial parameter, contact angle hysteresis (CAH). This study thus evaluates the two, contact angle and CAH, by conducting thin film hydrodynamic lubrication experiments with surfaces of hydrophilic and hydrophobic (contact angle ranging from 30° to 110°). The lubricating film thickness was measured under different speed–load conditions using optical interferometry with a fixed-incline slider bearing. The paper identifies CAH to be a better interfacial parameter for correlating with the thin film hydrodynamic lubrication effect. Fundamental relation between the potential energy barrier and CAH is discussed, and the experimental results are described using the critical shear stress slip model.
Starting Page	1
Ending Page	9
Page Count	9
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	58
Issue Number	3
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2015-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrodynamic lubrication Contact angle hysteresis Wettability Film thickness Critical shear stress Tribology, Corrosion and Coatings Surfaces and Interfaces, Thin Films Theoretical and Applied Mechanics Physical Chemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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