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Surface free energy of smooth and dehydroxylated fused quartz from contact angle measurements using some particular organics as probe liquids

I. ZGURA1,* , R. MOLDOVAN2, C. C. NEGRILA1, S. FRUNZA1, V. F. COTOROBAI1, L. FRUNZA1,*

Affiliation

  1. National Institute of Materials Physics, PO Box Mg-07, 077125 Magurele, Romania
  2. Center for Advanced Studies in Physics of the Romanian Academy, R-076117 Bucharest, Romania

Abstract

The dispersion and the polar independent contributions to the surface free energy in the case of fused quartz plates were evaluated by contact angle measurements against a series of liquids like water, glycerol, ethylene glycol, dimethyl sulfoxide and a nematic mixture NP5 of azoxybenzene type compounds. The smooth fused quartz plates were thermally pretreated at 240°C and 1000°C to decrease the number of surface hydroxyl groups; their surface was characterized by X-ray photoelectron spectroscopy. The contact angle data were further processed applying either the approach of Owens-Wendt with geometric mean or the Wu’s approach of harmonic mean of nonpolar and polar interactions. The liquids were chosen thus to fulfill Della Volpe and Siboni’s criterion namely that these have the condition number of system matrix low enough. The values obtained for the components of surface free energy were discussed in comparison with the results obtained in literature for crystalline quartz or for other silica forms as bulk or films. The study has shown a decrease of the polar component of the surface tension by increase of the pretreatment temperature..

Keywords

Surface free energy, Surface tension, Contact angle, Fused quartz, Owens-Wendt model, Wu model.

Submitted at: April 12, 2013
Accepted at: July 11, 2013

Citation

I. ZGURA, R. MOLDOVAN, C. C. NEGRILA, S. FRUNZA, V. F. COTOROBAI, L. FRUNZA, Surface free energy of smooth and dehydroxylated fused quartz from contact angle measurements using some particular organics as probe liquids, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 7-8, pp. 627-634 (2013)