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SUMMARY:Keynote 2 - Scattering and microscopy probes in colloidal systems 
 under shear: Linking structure and dynamics with mechanical response
DTSTART;VALUE=DATE-TIME:20181210T135000Z
DTEND;VALUE=DATE-TIME:20181210T143000Z
DTSTAMP;VALUE=DATE-TIME:20260523T113133Z
UID:indico-contribution-499@lindico453.srv.lu.se
DESCRIPTION:Speakers: George Petekidis (Materials science & Technology\, U
 niversity of Crete\, Greece)\nThe microscopic structure and dynamics in co
 lloidal systems at different length-scales\, from single to multiple parti
 cle level\, are probed under shear by a variety of scattering and direct i
 maging techniques. We present different studies of hard and soft particle 
 glasses and attractive gels of spherical and rod-like colloids\, where we 
 link the mechanical response with the underlying particle dynamics and str
 ucture.\nYielding of colloidal glasses under large amplitude oscillatory s
 hear was probed by simultaneous rheometry and light scattering with the LS
 -echo technique. We studied a range of colloidal systems with varying inte
 rparticle interactions from hard and soft sphere glasses to attractive gla
 sses and gels. LS-echo probes reversible and irreversible rearrangements t
 hat are linked with rheological yielding of the system.\nSecondly we discu
 ss the mechanisms responsible for a variety of shear induced structures in
  attractive colloidal gels and their relation to linear and nonlinear rheo
 logy. We use a combination of rheological experiments and rheo-confocal me
 asurements with computer simulations. In such thixotropic systems steady a
 nd oscillatory shear can be used as an external field to tune the structur
 e and mechanical properties of colloidal gels and drive them in metastable
  states\, not easily accessible at quiescent conditions.\nFinally\, we pre
 sent shear induced structural formations gels of attractive rod-like collo
 ids. More specifically we discuss the rheological response and flow induce
 d clustering of silica rods in a density matching solvent\, where electros
 tatic repulsions are screened via the addition of CsCl. A variety of simul
 taneous imaging techniques and rheometry reveals structural changes at dif
 ferent length-scales. Shear induced log-rolling clusters in the vorticity 
 direction are formed driven by an interplay of hydrodynamic interactions\,
  confinement and a balance of shear and attractive forces. Structural form
 ation is discussed as a function of volume fraction\, shear rate\, gap siz
 e\, tool geometry as well as shear history.\n\nhttps://lindico453.srv.lu.s
 e/event/67/contributions/499/
LOCATION:Elite Hotel Ideon Tera
URL:https://lindico453.srv.lu.se/event/67/contributions/499/
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