Rotational viscosity in liquid crystals: A molecular dynamics study
Makaleler > Tam Makale · 2005
Yazarlar: Emine Mine ÇAPAR, EMİNE CEBE
Chemical Physics Letters, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2005, cilt 407, ss 454-459
DOI: 10.1016/j.cplett.2005.03.125
Özet
The molecular dynamics (MD) simulations at various temperatures have been performed for the 4-alkyl-4'-cyanobiphenyls (nCB) with three alkyl groups, pentyl (5CB), heptyl (7CB), and octyl (8CB), in the nematic and isotropic phases. The rotational diffusion coefficient (RDC) was determined by using simulated second and fourth rank order parameters (OPs) and correlation time. The rotational viscosity coefficient (RVC) was computed by the Nemtsov-Zakharov and Fialkowski methods based on statistical mechanical approaches. Temperature and size dependence of the simulated RDC, RVC and OPs have been discussed. Reasonable aggreement between the simulated and experimental values was found. (c) 2005 Elsevier B.V. All rights reserved.