Open Access Nano Express

Dynamic contact angle of water-based titanium oxide nanofluid

Milad Radiom1, Chun Yang2* and Weng Kong Chan2

Author Affiliations

1 Department of Chemical Engineering, Virginia Tech, Blacksburg, VA 24060, USA

2 School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore

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Nanoscale Research Letters 2013, 8:282  doi:10.1186/1556-276X-8-282

Published: 11 June 2013

Abstract

This paper presents an investigation into spreading dynamics and dynamic contact angle of TiO2-deionized water nanofluids. Two mechanisms of energy dissipation, (1) contact line friction and (2) wedge film viscosity, govern the dynamics of contact line motion. The primary stage of spreading has the contact line friction as the dominant dissipative mechanism. At the secondary stage of spreading, the wedge film viscosity is the dominant dissipative mechanism. A theoretical model based on combination of molecular kinetic theory and hydrodynamic theory which incorporates non-Newtonian viscosity of solutions is used. The model agreement with experimental data is reasonable. Complex interparticle interactions, local pinning of the contact line, and variations in solid–liquid interfacial tension are attributed to errors.

Keywords:
Dynamic contact angle; Hydrodynamic theory; Molecular kinetic theory; Nanofluids; Nanoparticles; Non-Newtonian fluid; 68.08.Bc