Partial structure factors in star polymer/colloid mixtures
Condensed Matter lunchtime seminar
Partial structure factors in star polymer/colloid mixtures
- Event time: 1:00pm
- Event date: 27th August 2001
- Speaker: Jörg Stellbrink (IFF/KFA Jülich Germany)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
Event details
Addition of polymer to colloidal suspensions induces an attractive
part to the colloid pair potential, which is of purely entropic origin
(''depletion interaction''). We investigated the influence of polymer
branching by studying mixtures of hard sphere colloids and star
polymers with increasing arm number f=2-32, but constant Rg~50nm. We
found a pronounced effect of branching on the position of the
gas/liquid demixing transition.
Using Small Angle Neutron Scattering (SANS) we were able to measure partial structure factors in star polymer/colloid mixtures. The relative distance to the demixing transition is reflected in our scattering data. All experimental results are in good aggreement with recent theoretical calculations.
About Condensed Matter lunchtime seminars
This is a weekly series of informal talks given primarily by members of the institute of condensed matter and complex systems, 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..