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Demixing and nematic behaviour of oblate hard spherocylinders and hard spheres mixtures: Monte Carlo simulation and Parsons-Lee theory

AutorGámez, Francisco ; Acemel, Rafael D.; Cuetos, Alejandro
Palabras claveOblate hard spherocylinder
Discotics
Hard sphere
Parsons–Lee
Phase diagram
Binary mixtures
Fecha de publicación2013
EditorTaylor & Francis
CitaciónMolecular Physics 111(20): 3136- 3146 (2013)
ResumenParsons-Lee approach is formulated for the isotropic-nematic transition in a binary mixture of oblate hard spherocylinders and hard spheres. Results for the phase coexistence and for the equation of state in both phases for fluids with different relative size and composition ranges are presented. The predicted behaviour is in agreement with Monte Carlo simulations in a qualitative fashion. The study serves to provide a rational view of how to control key aspects of the behaviour of these binary nematogenic colloidal systems. This behaviour can be tuned with an appropriate choice of the relative size and molar fractions of the depleting particles. In general, the mixture of discotic and spherical particles is stable against demixing up to very high packing fractions. We explore in detail the narrow geometrical range where demixing is predicted to be possible in the isotropic phase. The influence of molecular crowding effects on the stability of the mixture when spherical molecules are added to a system of discotic colloids is also studied. © 2013 Taylor & Francis.
URIhttp://hdl.handle.net/10261/103673
DOI10.1080/00268976.2013.771802
Identificadoresdoi: 10.1080/00268976.2013.771802
issn: 0026-8976
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