Issue 33, 2023

Capillary detachment of a microparticle from a liquid–liquid interface

Abstract

The attachment and detachment of microparticles at a liquid–liquid interface are common in many material systems, from Pickering emulsions and colloidal assemblies to capillary suspensions. Properties of these systems rely on how the particles interact with the liquid–liquid interface, including the detachment process. In this study, we simultaneously measure the capillary detachment force of a microparticle from a liquid–liquid interface and visualize the shape of the meniscus by combining colloidal probe microscopy and confocal microscopy. The capillary behavior is studied on both untreated (hydrophilic) and fluorinated (hydrophobic) glass microparticles. The measured force data show good agreement with theoretical calculations based on the extracted geometric parameters from confocal images of the capillary bridge. It is also evident that contact line pinning is an important aspect of detachment for both untreated and fluorinated particles.

Graphical abstract: Capillary detachment of a microparticle from a liquid–liquid interface

Supplementary files

Article information

Article type
Paper
Submitted
10 Agd 2023
Accepted
01 Leq 2023
First published
01 Leq 2023

Soft Matter, 2023,19, 6247-6254

Capillary detachment of a microparticle from a liquid–liquid interface

S. A. Rahat, K. Chaudhuri and J. T. Pham, Soft Matter, 2023, 19, 6247 DOI: 10.1039/D3SM00470H

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