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Naslov:Influence of a random field on particle fractionation and solidification in liquid-crystal colloid mixtures
Avtorji:Popa-Nita, Vlad (Avtor)
Schoot, Paul van der (Avtor)
Kralj, Samo (Avtor)
Datoteke:URL http://dx.doi.org/10.1140/epje/i2006-10059-3
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano ()
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:PEF - Pedagoška fakulteta
Opis: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:liquid crystals, transitions, segregation, mixing, random fields, solidification, complex fluids
Leto izida:2006
UDK:539.2
COBISS_ID:15106824 Povezava se odpre v novem oknu
ISSN pri članku:1292-8941
NUK URN:URN:SI:UM:DK:AWQ87LP8
Število ogledov:758
Število prenosov:59
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Področja:Ostalo
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Gradivo je del revije

Naslov:The European physical journal
Založnik:EDP Sciences
ISSN:1292-8941
COBISS.SI-ID:15029543 Novo okno

Sekundarni jezik

Jezik:Angleški jezik
Ključne besede:tekoči kristali, prehodi, segregacija, mešanje, naključna polja


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