Tuesday, 24 May 2005

This presentation is part of: NanoScience and Technology Posters

Water Intrusion: A New Technique to Characterize Hydrophobic Porous Surfaces and Wetting in Nano-Confinement

Roy Helmy, Seton Hall University, South Orange, NJ and Alexander Y. Fadeev, Seton Hall University, South Orange, NJ.

Characterization of wetting and adhesion in nano-confined environment is of great fundamental interest due to its application in material science. This work describes a new experimental technique that provides insight into the wetting of hydrophobic surfaces in mesopores. This method utilizes the intrusion of water into the pore space of hydrophobic porous solids. The applicability of the method has been demonstrated for a series of well defined mesoporous silicas (SBA-15) hydrophobized with a monolayer of trimethylchlorosilane (pore radii of 2.5-4 nm). It is shown that capillary pressure for water in hydrophobic pores can not be described by classical models. Work of adhesion, however, for water in pores and on flat hydrophobic surfaces are in a very good agreement.

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