Systematically altering the hydrophobic nanobubble bridging capillary force from attractive to repulsive

Hampton, Marc A. and Nguyen, Anh V. (2009) Systematically altering the hydrophobic nanobubble bridging capillary force from attractive to repulsive. Journal of Colloid and Interface Science, 333 2: 800-806. doi:10.1016/j.jcis.2009.01.035


Author Hampton, Marc A.
Nguyen, Anh V.
Title Systematically altering the hydrophobic nanobubble bridging capillary force from attractive to repulsive
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 2009-05-01
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.jcis.2009.01.035
Open Access Status Not yet assessed
Volume 333
Issue 2
Start page 800
End page 806
Total pages 7
Editor D. T. Wason
Place of publication San Diego, CA, USA
Publisher Elseiver
Language eng
Subject C1
970103 Expanding Knowledge in the Chemical Sciences
030603 Colloid and Surface Chemistry
Abstract Atomic force microscopy (AFM) was used to examine how ethanol/water concentration affects the nanobubble bridging Capillary force between a hydrophobic silica colloidal probe and a hydrophobic silica wafer. Nanobubbles were produced on the solid surfaces by a previously utilised method which uses solvent-exchange and surface scanning. In pure water a strong, long range attractive force (approximate to 230 nm) with a single jump in step was measured, typical of an interaction between two nanobubbles attached to the hydrophobic Surfaces. An increase in the ethanol concentration had little effect on the range of the force but dramatically reduced its magnitude. At an ethanol concentration of 40% by mass, the force became repulsive after the initial attractive jump in. Above an ethanol concentration of 40% by mass, the capillary force disappeared. The change in the force with ethanol concentration was explained using a capillary force model with constant volume and contact angle. The bridge geometry, contact angle, volume and rupture distance were determined for different ethanol concentrations.
Keyword Hydrophobic Force
Capillary Force
Nanobubble
Atomic Force Microscopy
Ethanol
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Chemical Engineering Publications
 
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Created: Thu, 03 Sep 2009, 18:18:19 EST by Mr Andrew Martlew on behalf of School of Chemical Engineering