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Influence of finite size and wetting on nematic and smectic phase behavior of liquid crystal confined to controlled-pore matricesKutnjak, Zdravko ...The high-resolution calorimetric study was carried out on octylcyanobiphenyl liquid crystal (LC) confined to various controlled-pore glass (CPG) matrices with silane-treated surface. The diameter of ... the voids cross section ranged between 23.7 and 395 nm. The results are compared to those obtained previously on CPG voids nontreated with silane. We found a striking similarity between the shifts in the isotropic to nematic and nematic to smectic-A phase transition temperatures as a function of the void radius in which order parameter variations at the LC-void interface play the dominant role. Weaker temperature shifts are observed in silane-treated samples, where surface ordering tendency is larger. In nontreated samples, a finite-size scaling law in the maximum value of the heat capacity at the nematic to smectic-A transition was observed for void diameters larger than 20 nm. In silane-treated samples, this behavior is considerably changed by surface wetting interactionsSource: Physical review. E. - ISSN 1063-651X (70, 2004, str. 051703-1-051703-11)Type of material - article, component part ; adult, seriousPublish date - 2004Language - englishCOBISS.SI-ID - 18631975
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Database name | Field | Year |
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Kutnjak, Zdravko | 10124 |
Kralj, Samo | 08612 |
Lahajnar, Gojmir | 01115 |
Žumer, Slobodan | 07110 |
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