BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Chemical Engineering Seminars - Controlling and probing weak collo
 idal interactions from the nano to the micro scale
DTSTART:20160226T161500
DTEND:20160226T171500
DTSTAMP:20260407T100416Z
UID:c2aa10adb004ee4177e36ffbd9a74a2e48ec7e2efc3f3a540243792b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Frank Scheffold\nDepartment of Physics and Fribourg Cent
 er for Nanomaterials\, University of Fribourg\, Switzerland\nI will discus
 s a few examples how we can manipulate and probe soft interactions between
  small colloidal spheres ranging from 200nm to several microns. The contro
 l and understanding of these interactions is of fundamental interest in co
 ndensed matter physics but also of great importance for the design of new 
 materials. I will mainly focus on three types of colloids – charge stabi
 lized polymer beads\, emulsion droplets and microgels. These three popular
  model systems are rather well defined and the properties can be analyzed 
 and tuned by different means. I will first speak about strongly screened c
 harge stabilized polymer beads with a solid polymer core. These systems es
 sentially behave as hard spheres. I will present an experiment on a pair o
 f particles where we demonstrate that the interaction potential can be tun
 ed externally by inducing ‘artifical van-der Waals’ attractive forces 
 by embedding the particles in a very intense diffuse light cloud. I will t
 hen proceed to discuss two colloidal systems where the particles are defor
 mable. First I will discuss the popular microgel particles where the swell
 ing can be tuned by changing the solvent properties. These ‘smart colloi
 ds’ with tunable size and elasticity have attracted much attention becau
 se of their potential use as drug delivery agent or for tuning the flow pr
 operties of complex fluids. Here I will present a novel experiment where w
 e have used STORM superresolution microscopy (nanoscopy) to study the swel
 ling of individual microgel particles on the nanoscale. Finally I will con
 clude by presenting recent results on dense suspensions of nano- and micro
 n sized emulsion droplets where we study the glass and the jamming transit
 ion from the fluid to the highly compressed regime using a combination of 
 confocal microscopy\, low-coherence light scattering and diffusing wave sp
 ectroscopy.
LOCATION:CH B3 31 http://plan.epfl.ch/?room=CH%20B3%2031
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR