Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 462, Issue -, Pages 259-263Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2014.09.028
Keywords
Water-in-oil emulsion; AFM; Colloidal probe
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Funding
- King Abdullah University of Science and Technology (KAUST)
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Here we introduce an extension of the atomic force microscopy (AFM) colloidal probe technique, as a simple and reliable experimental approach to measure the interaction forces between small water droplets (similar to 80-160 pm) dispersed in oil. Small water droplets are formed by capillary breakup of a microscale water jet in air, which is forced out of a fine capillary nozzle, and deposited on a superhydrophobic substrate immersed in tetradecane oil medium. In these conditions the water droplets are very loosely attached to the superhydrophobic substrate and are easily picked up with a hydrophobic AFM cantilever to form a soft colloidal probe. Sample force measurements are conducted to demonstrate the capability of the technique. (C) 2014 Elsevier B.V. All rights reserved.
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