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Wetting study of hydrophobic membranes via liquid entry pressure measurements with aqueous alcohol solutions

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García Payo, María del Carmen and Izquierdo Gil, María Amparo and Fernández Pineda, Cristóbal (2000) Wetting study of hydrophobic membranes via liquid entry pressure measurements with aqueous alcohol solutions. Journal of Colloid and Interface Science, 230 (2). pp. 420-431. ISSN 0021-9797

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Official URL: http://dx.doi.org/10.1006/jcis.2000.7106


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Abstract

A new concept of liquid entry pressure measurements is applied to study the hydrophobicity of microporous membranes for aqueous alcohol solutions. The effects of alcohol concentration, type of alcohol, and temperature on liquid entry pressure of the membrane have been studied. Two theoretical equations for the determination of membrane pore size have been proposed. The former equation was developed taking into account the deviation from the Laplace-Young equation due to the membrane structure by means of the structure angle. The latter equation was established considering only the range of alcohol concentration in which the dispersion component of liquid surface tension remains practically constant. Hydrophobicity has been expressed in terms of wetting surface tension, gamma (W)(L). Based on these measurements, the maximum concentration before the spontaneous wetting occurs would be predicted.


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© 2000 Academic Press. The authors gratefully acknowledge Professor J. Morales Bruque at Extremadura University (Spain), who provided the facilities and helped carry out
the contact angle measurements. The authors also thank CICYT (Spain), Projects ALI-94-1044-CO3-02 and PB98-0788, for financial support.

Uncontrolled Keywords:Wetting; Liquid entry pressure; Microporous and hydrophobic membranes; Aqueous alcohol solutions
Subjects:Sciences > Physics > Thermodynamics
ID Code:25317
Deposited On:13 May 2014 10:07
Last Modified:11 Mar 2016 19:21

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