Soft colloidal probes for AFM force measurements between water droplets in oil

Ivan Uriev Vakarelski, Erqiang Li, Sigurdur T Thoroddsen

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

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 (~80-160. μm) 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.
Original languageEnglish (US)
Pages (from-to)259-263
Number of pages5
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume462
DOIs
StatePublished - Nov 2014

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). Most of the experiments were conducted in KAUST Microfluidics Thrust Area Labs.

ASJC Scopus subject areas

  • Colloid and Surface Chemistry

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