Suggested mechanisms responsible for liquid-crystalline ordering include non-spherical excluded volume effects, anisotropic attraction forces and flexibility. It has been shown using hard-core models that non-spherical excluded volume effects are the essential factor and can qualitatively explain the phenomenology of the problem. However, the simulation of hard-core models is technically demanding. A simpler and more direct alternative is to use a model with a soft-core site-site potential. We employ here a system of molecules composed of a few (11) atoms, constrained to form a multilinear molecule, and in mutual interaction via a continuous repulsive site-site potential of the form r-12. Our results show that such a model is capable of exhibiting nematic and smectic liquid-crystal phases.
SIMULATION OF SITE SITE SOFT-CORE LIQUID-CRYSTAL MODELS / Paolini, Gv; Ciccotti, Giovanni; Ferrario, M.. - In: MOLECULAR PHYSICS. - ISSN 0026-8976. - 80:(1993), pp. 297-312. [10.1080/00268979300102271]
SIMULATION OF SITE SITE SOFT-CORE LIQUID-CRYSTAL MODELS
CICCOTTI, Giovanni;
1993
Abstract
Suggested mechanisms responsible for liquid-crystalline ordering include non-spherical excluded volume effects, anisotropic attraction forces and flexibility. It has been shown using hard-core models that non-spherical excluded volume effects are the essential factor and can qualitatively explain the phenomenology of the problem. However, the simulation of hard-core models is technically demanding. A simpler and more direct alternative is to use a model with a soft-core site-site potential. We employ here a system of molecules composed of a few (11) atoms, constrained to form a multilinear molecule, and in mutual interaction via a continuous repulsive site-site potential of the form r-12. Our results show that such a model is capable of exhibiting nematic and smectic liquid-crystal phases.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
