Mixed Lipid- and Particle-Covered Interfaces
- Event time: 1:00pm
- Event date: 28th October 2013
- Speaker: Joe Forth (Formerly School of Physics & Astronomy, University of Edinburgh)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
Long-chain primary amines are simple lipids which, in the presence of a divalent counter-ion, assemble in to thick films at the oil-water interface. Water droplets coated by this film are highly stable against coalescence and have profiles not described by the Young-Laplace equation. Upon heating, the droplet interface fluidizes, the droplet profile relaxes to an equilibrium shape, and emulsions stabilised by the lipid alone coalesce. Particles in these emulsions then become mobile and order themselves; both in the bulk and at the interface. Particle separations of 20μm have been observed, suggesting long-range electrostatic interactions in the oil phase. We present results for this system taken using confocal fluorescence microscopy, interfacial rheology, and pendant drop tensiometry. Finally, we discuss the mechanism behind the particle charging, and the structure and physical properties of the lipid film.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..