PMID: 15244836Jul 13, 2004Paper

X-ray and dielectric measurements of the smectic- A -hexatic- B transitionin bulk and confined geometries

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Chethan V LoboD S Shankar Rao

Abstract

We report x-ray and dielectric measurements on a liquid crystal exhibiting a smectic- A -hexatic- B (Sm- A -Hex- B ) transition in bulk and confined geometries. The confined geometry experiments have been performed by filling the compound, n -butyl 4(') - n -hexyloxybiphenyl-4-carboxylate, into Anopore membranes with 20 nm pore size. The surprising result seen in the x-ray studies on both the bulk and the Anopore samples is the presence of unusually strong second harmonic reflection arising from the smectic layers in both the Sm- A and Hex- B phases. In fact, the third harmonic reflection is also observed in the entire temperature range of the Hex- B phase and close to the transition in the Sm- A phase of the bulk sample, with the ratio of I(2qo) / I(qo), and I(3qo) / I(qo) being approximately 1/40 and 1/470, respectively (here I(qo), I(2qo), and I(3qo) correspond to the peak intensities of the first, second, and third harmonic reflections). These features point to the fact that the layering is much better defined in this system, unlike the usual description of pure sinusoidal mass density wave with a typical value of 10(-4) for I(2qo) / I(qo). Another notable feature observed is that whereas the extent of positional correlatio...Continue Reading

References

Oct 5, 1992·Physical Review Letters·G S Iannacchione, D Finotello
Nov 14, 1994·Physical Review Letters·G S IannacchioneD Finotello
Oct 9, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·K L SandhyaCh Bahr

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Citations

Feb 26, 2016·The Journal of Physical Chemistry. B·Paul J RepaskyC Scott Hartley
Sep 15, 2018·Physical Chemistry Chemical Physics : PCCP·Sujeet Dutta, S Krishna Prasad
Dec 31, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·G SinhaJ Thoen
Feb 8, 2005·The European Physical Journal. E, Soft Matter·B Van RoieJ Thoen
Dec 13, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·F MercuriM Marinelli
Feb 21, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Chethan V LoboD S Shankar Rao
Aug 11, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·J LeysJ Thoen

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