Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
THEORY OF PHASE-SEPARATION FOR A SOLUTION OF TRIDISPERSE ROD-LIKE PARTICLES
Autore:
VROEGE GJ; LEKKERKERKER HNW;
Indirizzi:
UNIV UTRECHT,DEBYE INST,VANT HOFF LAB,PADUALAAN 8 NL-3584 CH UTRECHT NETHERLANDS
Titolo Testata:
Colloids and surfaces. A, Physicochemical and engineering aspects
, volume: 130, anno: 1997,
pagine: 405 - 413
SICI:
0927-7757(1997)130:<405:TOPFAS>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRIPLE-HELICAL POLYSACCHARIDE; RODLIKE PARTICLES; AQUEOUS-SOLUTIONS; DIFFERENT LENGTHS; BINARY-MIXTURES; SCHIZOPHYLLAN; SYSTEMS; CRYSTAL; MACROMOLECULES; SUPERLATTICE;
Keywords:
NEMATIC LIQUID CRYSTAL; ONSAGER THEORY; PHASE TRANSITION; POLYDISPERSITY; ROD;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
G.J. Vroege e H.N.W. Lekkerkerker, "THEORY OF PHASE-SEPARATION FOR A SOLUTION OF TRIDISPERSE ROD-LIKE PARTICLES", Colloids and surfaces. A, Physicochemical and engineering aspects, 130, 1997, pp. 405-413

Abstract

Within the Onsager theory, we study solutions of polydisperse thin hard rods. An approximate method by Odijk is used numerically to determine the orientational distribution functions in the nematic phase in a straightforward way. Next, the coexistence relations are used in determining phase transitions. In coexisting nematic phases equality of osmotic pressure implies equal overall number density. A procedure is developed to locate equal chemical potentials between nematic phases of tridisperse systems. For length ratios larger than 3, we find phase diagrams showing nematic three-phase regions, critical points, critical end points and as a limit a tricritical point. The mechanism is not dueto excluded-volume effects but to the interplay between orientationalentropy and entropy of mixing. At higher concentrations the phase diagram is independent of concentration. Below a certain concentration, coexistence with an isotropic phase intervenes. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 12:13:39