Title: An investigation on the effect of ultra-precision machined patterns in wetting transition

Authors: C.T. Cheng; S. To; C.Y. Chan; C.F. Cheung

Addresses: GH040, G/F, State Key Laboratory in Ultra-precision Machining Technology, Department of Industrial and System Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong. ' GH040, G/F, State Key Laboratory in Ultra-precision Machining Technology, Department of Industrial and System Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong. ' GH040, G/F, State Key Laboratory in Ultra-precision Machining Technology, Department of Industrial and System Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong. ' GH040, G/F, State Key Laboratory in Ultra-precision Machining Technology, Department of Industrial and System Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong

Abstract: This paper aims to study the influence of micro patterns on the wetting transition of a hydrophilic material. Surfaces with a designed pattern with various groove widths are machined by ultra-precision raster milling. The impact of different groove widths of the machined patterns on wetting transition will be discussed by studying the spreading of droplets on respective patterns. Contact angle and elongation length were measured using a contact angle goniometer. The present work revealed that machined surfaces on a hydrophilic material with micro patterns can achieve composite solid-liquid-air interfaces when the scales of the machined pattern fall into a critical range. The results from the experiments can provide useful information for designing self-cleaning surfaces.

Keywords: hydrophobic surfaces; micro patterns; wetting transition; ultra-precision raster milling; ultra-precision machining; nanomanufacturing; nanotechnology; hydrophilic materials; groove widths; self-cleaning surfaces.

DOI: 10.1504/IJNM.2011.042468

International Journal of Nanomanufacturing, 2011 Vol.7 No.3/4, pp.245 - 266

Received: 08 Dec 2010
Accepted: 14 Mar 2011

Published online: 14 Sep 2011 *

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