laboratoire de physique statistique
 
 
laboratoire de physique statistique

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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 


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2009
Two-dimensional crystallization of hard sphere particles at a liquid-liquid interface - Marnette, Olivier and Perez, Eric and Pincet, Frederic and Bryant, Gary
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 346208-212 (2009)

Abstract : A method for studying crystallization of hard sphere like particles in two dimensions is presented. The method involves trapping the particles at the interface between two immiscible liquids. Particles at the interface undergo 2D Brownian motion, and at sufficiently high densities crystallization is observed. The pseudo hard sphere nature of the particle interactions under these conditions is maintained, as demonstrated by the area density at which crystallization occurs. In contrast to established techniques for studying crystallization in pseudo 2D hard spheres, the particles trapped at the interface undergo no vertical motion, so the system is in principle closer to a true 2D system. The method is therefore amenable to the study of the effects of polydispersity on crystallization behaviour. The advantages and disadvantages of the method are discussed. (C) 2009 Elsevier B.V. All rights reserved.
 
2007
Receding contact angle in the situation of complete wetting: Experimental check of a model used for evaporating droplets - Guena, Geoffroy and Allancon, Pascal and Cazabat, Anne-Marie
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 300307-314 (2007)

Abstract : This paper provides experimental checks of assumptions needed in a model describing the moving contact line of a wetting droplet evaporating in an inert atmosphere. Special interest is given to the maximum extension of the droplet, when the contact line starts receding. The predicted power law dependence between the values of the radius R-0 and the contact angle Theta(0) at the maximum extension is checked against experiments. We find fairly good agreement with theory for very small droplets. However, discrepancies show Lip rapidly when the droplet size increases. (C) 2007 Published by Elsevier B.V.