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SUMMARY:Colloidal forces – Tackling mechanics and interactions of comple
 x particles using AFM/optics combination - Prof Andreas Fery\, University 
 of Bayreuth Department of Physical Chemistry
DTSTART:20100304T160000Z
DTEND:20100304T170000Z
UID:TALK21447@talks.cam.ac.uk
CONTACT:Catherine Jordan
DESCRIPTION:During the past decade\, colloid-synthesis has greatly improve
 d and particles with unprecedented complexity in terms of shape\, composit
 ions and interactions are now available. This opens new perspectives for m
 any areas like micro-encapsulation\, sensing\, biomimetics or buildup of c
 omposite materials\, but it as well poses new challenges for the character
 ization of particles. We focus on developing new tools for characterizatio
 n of deformation- and interaction forces of colloidal particles on the sin
 gle particle level. \nThe combination of Atomic-Force Microscopy with opti
 cal microscopy techniques like micro-interferometry or fluorescence micros
 copy is particularly useful for this task.- Colloidal particles can be dir
 ectly attached onto AFM cantilevers \, allowing for precise measurements o
 f forces acting on the particle as a function of displacement of the parti
 cle relative to a flat substrate. However in order to interpret this force
 -displacement data correctly in terms of mechanical or adhesion forces\, a
 dditional information on shape changes of the particles is highly desirabl
 e. This can be achieved using in situ optical microscopy. \nWe show how th
 is technique can be used to “shed light” on the deformation of microca
 psules like Polyelektrolyte Multilayer capsules [1\, 2] or Pickering emuls
 ion based systems [3\, 4]. In the following\, we introduce the “soft col
 loidal probe AFM” which allows precise measurements of adhesion energies
  for soft matter surfaces [5].\n \n1. Bedard MF\, Munoz-Javier A\, Muller 
 R\, del Pino P\, Fery A\, Parak WJ\, Skirtach AG and Sukhorukov GB. Soft M
 atter 2009\; 5 (1): 148-155.\n2. Fery A and Weinkamer R. Polymer 2007\; 48
 : 7221-7235.\n3. Ferri JK\, Carl P\, Gorevski N\, Russell TP\, Wang Q\, B
 öker A and Fery A. Soft Matter 2008\; 11: 2259-2266.\n4. Russell JT\, Lin
  Y\, Böker A\, Su L\, Carl P\, Zettl H\, He J\, Sill K\, Tangirala R\, Em
 rick T\, Littrell K\, Thiyagarajan P\, Cookson D\, Fery A\, Wang Q and Rus
 sell TP. Angew. Chemie Int. Ed. 2005\; 44: 2420-2426.\n5. Erath J\, Schmid
 t S and Fery A. Soft Matter\, accepted\, manuscript b923540j 
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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