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SUMMARY:Electrostatics and soft matter: from star-branched polyelectrolyte
 s to patchy colloids - Prof. Christos Likos\, University of Vienna
DTSTART:20120125T141500Z
DTEND:20120125T151500Z
UID:TALK34284@talks.cam.ac.uk
CONTACT:Robert Best
DESCRIPTION:In this talk\, we will first review the physics of star-branch
 ed polyelectrolytes (SBP)\, demonstrating that the Physics of their confor
 mations and interactions is dictated by electrostatics in a rather subtle 
 fashion: whereas the mutual repulsions of the charged monomers play the de
 cisive role in stretching the arms\, the subsequent effective interactions
  between SBP’s is dominated by the entropic repulsion between the counte
 rions adsorbed in the interior of the SBP’s [1]. We will present the ext
 ensions of the theory to both spherical polyelectrolyte brushes [1] and to
  rigid chains [2\,3]\, proceeding to the investigations on adsorption of P
 E-stars onto oppositely charged flat surfaces [4] or colloidal spheres [5]
 . We argue that the complexes that form can be viewed as a novel type of p
 atchy colloids [6]\, and we present an efficient way of coarse-graining th
 eir effective interactions to a manageable yet realistic mesoscopic model 
 [7]. Finally\, we discuss ongoing work on soft patchy colloids\, emerging 
 out of end-functionalized starbust block copolymers [8].\n\n[1] A. Jusufi 
 and C. N. Likos\, Rev. Mod. Phys. 81\, 1753 (2009).\n[2] K. Kegler\, M. Ko
 nieczny\, G. Dominguez-Espinosa\, C. Gutsche\, M. Salomo\, F. Kremer\, and
  C. N. Likos\, Phys. Rev. Lett. 100\, 118302 (2008).\n[3] A. Wynveen and C
 . N. Likos\, Soft Matter 6\, 163 (2010).\n[4] M. Konieczny and C. N. Likos
 \, Soft Matter 3\, 1130 (2007).\n[5] C. N. Likos\, R. Blaak\, and A. Wynve
 en\, J. Phys.: Condens. Matter 20\, 494221 (2008).\n[6] E. Bianchi\, R. Bl
 aak\, and C. N. Likos\, Phys. Chem. Chem. Phys. 13\, 6397 (2011).\n[7] E. 
 Bianchi\, G. Kahl\, and C. N. Likos\, Soft Matter 7\, 8313 (2011).\n[8] B.
  Capone\, C. N. Likos\, and F. LoVerso\, in preparation.\n
LOCATION:Department of Chemistry\, Cambridge\, Pfizer lecture theatre
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