Avtor/Urednik		Rovšek, Barbara; Čepič, Mojca; Žekš, Boštjan
Naslov		Uniplanar smectic phases in free-standing films
Tip		članek
Vir		Phys Rev, E Stat Phys Plasmas Fluids Relat
Vol. in št.		Letnik 62, št. 3
Leto izdaje		2000
Obseg		str. 3758-65
Jezik		eng
Abstrakt		Structures of various phases that appear in antiferroelectric liquid crystals can be described within a simple discrete phenomenological model of antiferroelectric liquid crystals, which for the smectic-C-alpha (SmCalpha) phase suggests a short-pitch helicoidal structure. In a paper presented here the same model is used to analyze theoretically free-standing films, formed by a finite number of smectic layers. In the bulk sample a transition from the smectic-A (SmA) phase is either to the ferroelectric SmC* phase, the SmC*A phase, or the antiferroelectric SmCalpha phase, as observed from experiments as well as comprehended in the model. However in free-standing films uniplanar structures, which in a bulk sample were not observed experimentally nor predicted by the model, are shown to appear immediately below the transition from the high-temperature SmA phase. In free-standing film uniplanar structure remains stable in a narrow temperature region between SmA and SmCalpha phase.
Deskriptorji		BIOPHYSICS CRYSTALLIZATION ELECTROMAGNETIC FIELDS MODELS, THEORETICAL