Physics Seminar: Prof Paul Clegg

Centre for Computational Physics

Date: Wednesday 13th of January 2021, 13:30.
Location: Online (MS Teams meeting).

‘Are Langmuir trough studies useful? Unexpected emulsification behaviour using colloidal rods’

by Prof Paul Clegg, School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK.

Abstract:

While studies carried out in a Langmuir trough have demonstrated that, at high surface pressure, rod-like colloidal particles flip from being parallel to being perpendicular to the liquid interface much less is known about the practical situation on the surface of a droplet or bubble. We present emulsification studies using colloidal rods and find that the rods are often shared between droplets forming a “bridge”. In a trough, it is the low aspect ratio rods which flip and the high aspect ratio rods which form bilayers; on the surface of a droplet we found that the high aspect ratio rods always bridge whereas the shorter rods are bistable. Hence…

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