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Calorimetric study of octylcyanobiphenyl liquid crystal confined to a controlled-pore glass | | Zdravko Kutnjak
; Samo Kralj
; Gojmir Lahajnar
; Slobodan Zumer
; | | Date: |
31 Jul 2003 | | Journal: | Phys Rev E, 68 (2 Pt 1), 021705 | | Abstract: | We present a calorimetric study of the phase behavior of octylcyanobiphenyl (8CB) liquid crystal confined to a controlled-pore glass (CPG). We used CPG matrices with characteristic void diameters ranging from 400 to 20 nm. In bulk we obtain weakly first-order isotropic to nematic (I-N) phase transition and nearly continuous character of the nematic to smectic-A (N-SmA) phase transition. In all CPG matrices the I-N transition remains weakly first order, while the N-SmA one becomes progressively suppressed with decreasing CPG pore radius. With decreased pore diameters both phase transition temperatures monotonously decrease following similar trends, but increasing the stability range of the N phase. The heat-capacity response at the weakly first order I-N and continuous N-SmA phase transitions gradually approaches the tricritical-like and three-dimensional XY behavior, respectively. The main observed features were explained using a bicomponent single pore type phenomenological model. | | Source: | PubMed, pmid14524991 | | Services: | Forum | Review | Favorites | |
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