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Vol. 13, Special Issue, December 2011, pp.62-72




Superhydrophobic Porous Silicon Surfaces


1 Paolo NENZI, 2 Alberto GIACOMELLO, 2 Guido BOLOGNESI, 3 Mauro CHINAPPI, 1 Marco BALUCANI, and 2 Carlo Massimo CASCIOLA

1Dipartimento di Ingegneria dell'Informazione, Elettronica e delle Telecomunicazioni,

2Dipartimento di Ingegneria Meccanica e Aerospaziale,

3Dipartimento di Fisica, Sapienza Universitą di Roma, via Eudossiana 18, 00184, Italy

Tel: 1+39-0644585846, 2+39-06-44585201

E-mail: 1 balucani@die.uniroma1.it, 2 carlomassimo.casciola@uniroma1.it



Received: 29 June 2011   /Accepted: 16 November 2011   /Published: 28 December 2011

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Abstract: In this paper, we present an inexpensive technique to produce superhydrophobic surfaces from porous silicon. Superhydrophobic surfaces are a key technology for their ability to reduce friction losses in microchannels and their self cleaning properties. The morphology of a p-type silicon wafer is modified by a electrochemical wet etch to produce pores with controlled size and distribution and coated with a silane hydrophobic layer. Surface morphology is characterized by means of scanning electron microscope images. Large contact angles are observed on such surfaces and the results are compared with classical wetting models (Cassie and Wenzel) suggesting a mixed Wenzel-Cassie behavior. The presented technique represents a cost-effective means for friction reduction in microfluidic applications, such as lab-on-a-chip.


Keywords: Macroporous silicon, Hydrophobic coatings, Superhydrophobic surfaces


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