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    Facile fabrication of superhydrophobic poly(methyl methacrylate) substrates using ultrasonic imprinting

    Year: 2013

    Journal: Journal of Micromechanics and Microengineering, 23, 055019, 20130926

    Authors: Young Hak Cho, Young Soo Seo, In Yong Moon, Bo Hyun Kim, Keun Park

    Organizations: Department of Mechanical System Design Engineering, Seoul National University of Science andTechnology, Seoul, Korea, Department of Mechanical Engineering, Soongsil University, Seoul, Korea

    Superhydrophobic surfaces (SHSs) have received increasing attention in the last decade, andhave been generally developed from hydrophobic materials. In this study, a facile fabricationmethod based on ultrasonic imprinting is proposed to develop SHSs from a hydrophilicpolymer, poly(methyl methacrylate) (PMMA). To fabricate SHSs on PMMA substrates, microelectrical discharge machining, micromachining and ultrasonic imprinting were sequentiallyused. The ultrasonic imprinting was performed for various channel designs and imprintingconditions, and the resulting water contact angles were measured for the replicated samples. Asa result, superhydrophobic characteristics could be obtained on a hydrophilic PMMA replicawithout any chemical treatments. The effects of nanoscale roughness on the replicated channelas well as composition change are discussed with respect to the analyses using an atomic forcemicroscope, x-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy.