Issue 29, 2019

Measurement of the force between uncharged colloidal particles trapped at a flat air/water interface

Abstract

The radial attraction between microspheres straddling at the air/water interface (Bond number ≪1), whose origin is the irregular shape of the contact line and its concomitant distortion of the water surface, is measured using two light beams of a time-sharing optical tweezer. The colloidal particles used to make the measurements are microspheres made of hydrophobically covered silica to reduce the electrostatic interactions to a minimum. The measured radial force goes as a quadrupolar power law, r−n, with n = 5.02 ± 0.18 and n = 5.04 ± 0.18 for particles of 3 μm and 5 μm, respectively. In both cases, the electrostatic interaction is negligible.

Graphical abstract: Measurement of the force between uncharged colloidal particles trapped at a flat air/water interface

Supplementary files

Article information

Article type
Communication
Submitted
25 máj 2019
Accepted
03 júl 2019
First published
05 júl 2019

Soft Matter, 2019,15, 5815-5818

Measurement of the force between uncharged colloidal particles trapped at a flat air/water interface

V. Carrasco-Fadanelli and R. Castillo, Soft Matter, 2019, 15, 5815 DOI: 10.1039/C9SM01051C

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