Vlad Dumitru Popa-Nita (Avtor), Paul van der Schoot (Avtor), Samo Kralj (Avtor)

Povzetek

The influence of a random-anisotropy (RA) type disorder on the phase separation of nematogen-colloid mixtures is studied theoretically by combiningthe phenomenological Landau-de Gennes, Carnahan-Starling, and hard-sphere crystal theories. We assume that the colloids enforce the RA disorder on the surrounding thermotropic liquid-crystal (LC) molecules. We adopt the Imry-Ma argument according to which the lower-temperature phase exhibits a domain-type pattern. The colloids impose a finite degree of orientational ordering even in the isotropic (paranematic) phase. In the ordered phase they give rise to a domain-type structure, resulting in the distorted nematic (speronematic) phase. The RA field opposes the phase separation tendency. With increasing disorder the difference between the paranematic and speronematic ordering decreases. Consequently there is a critical disorder, above which both phases become identical from the orientation point of view, but have different concentrations of colloids. We have also estimated another characteristic value of disorder above which the isotropic phase can exist only in a liquid state, the crystal phase being suppressed completely.

Ključne besede

tekoči kristali;prehodi;segregacija;mešanje;naključna polja;ne zaključna dela;liquid crystals;transitions;segregation;mixing;random fields;solidification;complex fluids;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UM PEF - Pedagoška fakulteta
UDK: 539.2
COBISS: 15106824 Povezava se bo odprla v novem oknu
ISSN: 1292-8941
Št. ogledov: 1379
Št. prenosov: 90
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: tekoči kristali;prehodi;segregacija;mešanje;naključna polja;
URN: URN:SI:UM:
Vrsta dela (COBISS): Članek v reviji
Strani: str. 189-197
Zvezek: 21
Čas izdaje: 2006
ID: 8724205