Comparative x-ray measurements of a de Vries smectic- A material in bulk and confined geometries

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

Volumn 72, Issue 6, 2005, Pages

  Lobo, Chethan V ^a   Prasad, S Krishna ^a   Rao, D S Shankar ^a  

^a CENTRE FOR NANO AND SOFT MATTER SCIENCES   (India)

Author keywords

[No Author keywords available]

Indexed keywords

GEOMETRY; PHASE TRANSITIONS; SHRINKAGE; X RAY ANALYSIS;

DE VRIES MATERIALS; TRANSITIONS; X-RAY INVESTIGATIONS;

SMECTIC LIQUID CRYSTALS;

EID: 33244480075     PISSN: 15393755     EISSN: 15502376     Source Type: Journal    
DOI: 10.1103/PhysRevE.72.062701     Document Type: Article

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35. It may be pointed out that the temperature dependence of d is not linear, particularly for the bulk TCOB sample, at temperatures above T1. In fact, there are indications of such supralinear (increasing negative slope with decreasing temperature) behavior of the values of the intercolumnar distance within the columnar phase [E. Fontes, P. A. Heiney, and W. H. De Jeu, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.61.1202 61, 1202 (1988)]. Thus, at least in some materials, the stretching of the alkyl chains may not cause a simple linear increase in d with decreasing temperature. Anyway, since the overall change itself is much smaller in the Anopore TCOB sample, this effect will also be smaller.