The nematic–isotropic phase transition in linear fused hard-sphere chain fluids
| Autor: | K. M. Jaffer, Sheldon B. Opps, D. E. Sullivan |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Physics
Phase transition 010304 chemical physics Condensed matter physics Isotropy FOS: Physical sciences General Physics and Astronomy Tangent Decoupling (cosmology) Condensed Matter - Soft Condensed Matter 010402 general chemistry 01 natural sciences 0104 chemical sciences Liquid crystal Intramolecular force 0103 physical sciences Excluded volume Soft Condensed Matter (cond-mat.soft) Density functional theory Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Chemical Physics. 110:11630-11642 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.479102 |
| Popis: | We present a modification of the generalized Flory dimer theory to investigate the nematic (N) to isotropic (I) phase transition in chain fluids. We focus on rigid linear fused hard-sphere (LFHS) chain molecules in this study. A generalized density functional theory is developed, which involves an angular weighting of the dimer reference fluid as suggested by decoupling theory, to accommodate nematic ordering in the system. A key ingredient of this theory is the calculation of the exact excluded volume for a pair of molecules in an arbitrary relative orientation, which extends the recent work by Williamson and Jackson for linear tangent hard-sphere chain molecules to the case of linear fused hard-sphere chains with arbitrary intramolecular bondlength. The present results for the N-I transition are compared with previous theories and with computer simulations. In comparison with previous studies, the results show much better agreement with simulations for both the coexistence densities and the nematic order parameter at the transition. Comment: 15 pages, 13 figures To be published in: Journal of Chemical Physics; Issue 23, 1999 Replaced due to poor initial versions of figures 8 and 9 |
| Databáze: | OpenAIRE |
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