High-resolution calorimetric study of a liquid crystalline organo-siloxane tetrapode with a biaxial nematic phase | Zendy

George Cordoyiannis | Zendy; Daniela Apreutesei | Zendy; Georg H. Mehl | Zendy; Christ Glorieux | Zendy; Jan Thoen | Zendy

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High-resolution calorimetric study of a liquid crystalline organo-siloxane tetrapode with a biaxial nematic phase

Author(s) -

George Cordoyiannis,

Daniela Apreutesei,

Georg H. Mehl,

Christ Glorieux,

Jan Thoen

Publication year - 2008

Publication title -

physical review e

Language(s) - English

Resource type - Journals

eISSN - 1550-2376

pISSN - 1539-3755

DOI - 10.1103/physreve.78.011708

Subject(s) - liquid crystal , differential scanning calorimetry , materials science , phase transition , phase (matter) , adiabatic process , calorimetry , isotropy , siloxane , latent heat , condensed matter physics , thermodynamics , optics , composite material , chemistry , physics , organic chemistry , polymer , optoelectronics

High-resolution adiabatic scanning calorimetry and differential scanning calorimetry have been employed to study the thermal behavior of an organo-siloxane tetrapode reported to exhibit a biaxial nematic phase. No signature of the uniaxial to biaxial nematic phase transition could be retraced in sequential heating and cooling runs under different scanning rates, within the experimental resolution. The results obtained reveal that an extremely small heat should be involved in the uniaxial to biaxial nematic phase transition. The isotropic to uniaxial nematic transition at 318+/-0.01 K is very stable, and it is weakly first order with a rather small latent heat of 0.20+/-0.02 J/g .

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