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AFM study of forces between silicon oil and hydrophobic - hydrophylic surfaces in aqueous solutions

Frost, Ray L. & Zbik, Marek (2010) AFM study of forces between silicon oil and hydrophobic - hydrophylic surfaces in aqueous solutions. Journal of Colloid and Interface Science, 349(2), pp. 492-497.

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Abstract

An investigation has been made of the interactions between silicone oil and various solid substrates immersed in aqueous solutions. Measurements were made using an atomic force microscope (AFM) using the colloid-probe method. The silicone oil drop is simulated by coating a small silica sphere with the oil, and measuring the force as this coated sphere is brought close to contact with a flat solid surface. It is found that the silicone oil surface is negatively charged, which causes a double-layer repulsion between the oil drop and another negatively charged surface such as mica. With hydrophilic solids, this repulsion is strong enough to prevent attachment of the drop to the solid. However, with hydrophobic surfaces there is an additional attractive force which overcomes the double-layer repulsion, and the silicone oil drop attaches to the solid. A "ramp" force appears in some, but not all, of the data sets. There is circumstantial evidence that this force results from compression of the silicone oil film coated on the glass sphere.

Impact and interest:

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ID Code: 33243
Item Type: Journal Article
Keywords: Silicon oil, interface forces, surface potential, AFM forces, PDMS interface forces.
DOI: 10.1016/j.jcis.2010.05.078
ISSN: 0021-9797
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2010 Elsevier
Deposited On: 26 Jul 2010 09:04
Last Modified: 01 Mar 2012 00:16

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