Wetting behaviour of hydrophilic and hydrophobic nanostructured porous anodic alumina

H. Leese, V. Bhurtun, K.P. Lee, D. Mattia

Research output: Contribution to journalArticle

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Abstract

This paper investigates the effect of surface structure and chemistry on the wetting properties of nanostructured porous anodic alumina (PAA). Measurements of the equilibrium apparent contact angle (APCA) were first taken on as produced hydrophilic nanoporous alumina with a range of pore diameters from 10 to 170. nm, yielding a range of contact angles from 10 to 100°. The PAAs were then coated with a fluorosilane to change the surface chemistry of the nanostructures. The same trend was observed as in the hydrophilic case, but the contact angles increased from 106 to 150° for pores sizes ranging from 10 to 100. nm for the hydrophobic PAA. These results probe the limits of the current wetting models such as the Cassie-Baxter and Wenzel equations for nanostructured materials. A geometric model has been developed using the equation proposed by Marmur to explain the wetting properties of the bare- and silanized-PAA.
Original languageEnglish
Pages (from-to)53-58
Number of pages6
JournalColloids and Surfaces, A: Physicochemical and Engineering Aspects
Volume420
DOIs
Publication statusPublished - 5 Mar 2013

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Aluminum Oxide
wetting
Wetting
Alumina
aluminum oxides
Contact angle
Surface chemistry
chemistry
porosity
Nanostructured materials
Surface structure
Pore size
Nanostructures
trends
probes

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Wetting behaviour of hydrophilic and hydrophobic nanostructured porous anodic alumina. / Leese, H.; Bhurtun, V.; Lee, K.P.; Mattia, D.

In: Colloids and Surfaces, A: Physicochemical and Engineering Aspects, Vol. 420, 05.03.2013, p. 53-58.

Research output: Contribution to journalArticle

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