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TZID:Europe/Paris
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UID:1-165@lptms.universite-paris-saclay.fr
DTSTART:20130924T110000Z
DTEND:20130924T120000Z
DTSTAMP:20130730T130916Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-oleg-borisov/
SUMMARY:Séminaire du LPTMS: Oleg Borisov - LPTMS\, salle 201\, 2ème étag
 e\, Bât 100\, Campus d'Orsay - 24 Sep 13 11:00
DESCRIPTION:Poisson-Boltzmann theory of polyelectrolyte brushes\nOleg Boris
 ov\,  IPREM\, Université de Pau\nThe polyelectrolyte brush results if lo
 ng flexible ionic polymer chains are attached by one end onto an impermeab
 le solid surface or onto the surface of a colloidal particle and immersed 
 in a solvent. Understanding of the structure-properties relation in polyme
 r and polyelectrolyte brushes is important for their applications for surf
 ace modification\, in particular\, in the field of biomaterial engineering
 . Functional polymer brush-like structures are found in biological systems
 . Examples of natural biopolyelectrolyte brushes include extracellular pol
 ysaccharides on bacterial surfaces\, neurofilaments and microtubules with 
 associated proteins\, aggrecan macromolecules in articular cartilage\, cas
 ein micelles etc. The possibility to trigger conformational transitions in
  surface-attached polymeric layers by external physical (temperature\, ele
 ctrical voltage\, etc.) or chemical (pH\, salinity\, solvent composition\,
  etc.) fields opens a perspective for design of stimuli-responsive interfa
 ces. Theory of equilibrium structural properties  of polyelectrolyte brus
 hes is developed in the frame of self-consistent field Poisson-Boltzmann a
 pproximation. We analyze the influence of ionic strength and (in the case 
 of weak polyacid or polybase brushes) pH in the solution on the chain conf
 ormations in the brush. The effect of the counterion localization in the p
 olyelectrolyte brush is most essential and governing the brush properties.
  The repulsive forces acting between surfaces or colloidal particles with 
 grafted polyelectrolytes are calculated.  Furthermore\, we discuss intera
 ction of polyelectrolyte brushes with multivalent counterions and with glo
 bular proteins and the effect of their accumulation in the brushes. 
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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