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SUMMARY:Isotropic-polar phase transition in an amphiphilic fluid - Schoen\
 , M (Technische Universitt Berlin)
DTSTART:20130321T095000Z
DTEND:20130321T104000Z
UID:TALK44057@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:We present Monte Carlo simulations of the isotropic-polar (IP)
  phase transition in an am-phiphilic fluid carried out in the isothermal-i
 sobaric ensemble. Our model consists of Lennard-Jones spheres where the at
 tractive part of the potential is modified by an orientation-dependent fun
 ction. This function gives rise to an angle dependence of the intermolecul
 ar attractions corresponding to that characteristic of point dipoles. Our 
 data show a substantial system-size dependence of the dipolar order parame
 ter. We analyze the system-size de-pendence in terms of the order-paramete
 r distribution and a cumulant involving its first and second moments. The 
 order parameter\, its distribution\, and susceptibility observe the scalin
 g behavior characteristic of the classical 3D-Heisenberg universality clas
 s. Because of this scaling behavior and because all cumulants have a commo
 n intersection irrespective of sys-tem size we conclude that the IP phase 
 transition is continuous. Considering pre ssures 1.3≤ P≤3.0 we demonst
 rate that a line of continuous phase transition exists which is analogous 
 to the Curie line in systems exhibiting a ferroelectric transition. Our re
 sults are can be explained semi-quantitatively by a simple mean-field theo
 ry adapted from the theory of IP phase transi-tions in fluids in which mol
 ecules carry an electromagnetic point dipole.\n\n
LOCATION:Seminar Room 1\, Newton Institute
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