Direct Observation of Diffuse Cone Behavior in de Vries Smectic-Aand -CPhases of Organosiloxane Mesogens | Zendy

HyungGuen Yoon | Zendy; Deña M. Agra-Kooijman | Zendy; Khurshid Ayub | Zendy; Robert P. Lemieux | Zendy; Satyendra Kumar | Zendy

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Direct Observation of Diffuse Cone Behavior in de Vries Smectic-Aand -CPhases of Organosiloxane Mesogens

Author(s) -

HyungGuen Yoon,

Deña M. Agra-Kooijman,

Khurshid Ayub,

Robert P. Lemieux,

Satyendra Kumar

Publication year - 2011

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.106.087801

Subject(s) - order (exchange) , materials science , tilt (camera) , siloxane , exponent , physics , liquid crystal , crystallography , condensed matter physics , nuclear magnetic resonance , chemistry , geometry , mathematics , polymer , linguistics , philosophy , finance , economics

Simultaneous and direct x-ray measurements of the smectic layer spacing, molecular tilt, and orientational order in the de Vries smectic A (SmA) and C (SmC) phases of two organosiloxane mesogens reveal that (i) the SmC (tilt) order parameter exponent β=0.26±0.01 for 2nd order SmA-SmC transition--in excellent agreement with the tricritical behavior, (ii) the siloxane and hydrocarbon parts of the molecules are segregated and oriented parallel to the director with very different degree of orientational order, and (iii) thermal evolution of the effective molecular length is different in the two phases.

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