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Titolo:
DEMIXING VERSUS ORDERING IN HARD-ROD MIXTURES
Autore:
VANROIJ R; MULDER B;
Indirizzi:
FOM,INST ATOM & MOL PHYS,KRUISLAAN 407 NL-1098 SJ AMSTERDAM NETHERLANDS
Titolo Testata:
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
fascicolo: 6, volume: 54, anno: 1996,
pagine: 6430 - 6440
SICI:
1063-651X(1996)54:6<6430:DVOIHM>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRYSTAL PHASE-SEPARATION; SMECTIC ORDER; PARALLEL SPHEROCYLINDERS; RODLIKE PARTICLES; DIFFERENT LENGTHS; BINARY-MIXTURES; DIAGRAM; SYSTEM; CYLINDERS; COLUMNAR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
R. Vanroij e B. Mulder, "DEMIXING VERSUS ORDERING IN HARD-ROD MIXTURES", Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 54(6), 1996, pp. 6430-6440

Abstract

We present a simple treatment of the depletion-driven demixing transition in isotropic and perfectly aligned binary hard-rod mixtures. The simplicity is mainly due to the fact that we use the second virial approximation to the Helmholtz free energy in combination with a convenient Legendre transform. This combination leads to an exact expression for the depletion-driven demixing spinodal in isotropic mixtures of hard rods with different diameters. We show for rod species with the samelength that the demixing spinodal is thermodynamically stable with respect to the isotropic-nematic transition, if the diameter ratio is larger than about 5. We also show that perfectly aligned rod mixtures show a nematic-nematic demixing spinodal, that may preempt the nematic-smectic or the nematic-columnar bifurcation if the size difference between the particles is sufficiently large.

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Documento generato il 29/09/20 alle ore 11:45:38