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 Maijs 2019
Accepted
03 Jūl. 2019
First published
05 Jūl. 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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements