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Entropic forces in binary hard sphere mixtures: Theory and simulation Ronald Dickmana)
 

Summary: Entropic forces in binary hard sphere mixtures: Theory and simulation
Ronald Dickmana)
Department of Physics and Astronomy, Lehman College, City University of New York, Bronx,
New York 10468-1589
Phil Attardb)
School of Chemistry, F11, University of Sydney, NSW, 2006 Australia
Veronika Simonianc)
Department of Physics and Astronomy, Lehman College, City University of New York, Bronx,
New York 10468-1589
Received 15 January 1997; accepted 26 March 1997
We perform extensive Monte Carlo simulations of binary hard-sphere mixtures with diameter ratios
of 5 and 10 , to determine the entropic force between 1 a macrosphere and a hard wall, and 2 a
pair of macrospheres. The microsphere background fluid at volume fractions ranging from 0.1 to
0.34 induces an entropic force on the macrosphere s ; the latter component is at infinite dilution.
We find good overall agreement, in both cases, with the predictions of a hypernetted chain-based
theory for the entropic force. Our results also argue for the validity of the Derjaguin approximation
relating the force between convex bodies to that between planar surfaces. The earlier
Asakura-Oosawa theory, based on a simple geometric argument, is only accurate in the low-density
limit. 1997 American Institute of Physics. S0021-9606 97 50725-2
I. INTRODUCTION

  

Source: Attard, Phil - School of Chemistry, University of Sydney

 

Collections: Chemistry