Overall analysis of first-order phase transitions in some alkyloxycyanobiphenyl liquid crystals

被引：7

作者：

Cusmin, P. ^{[1
]}

Salud, J. ^{[1
]}

Lopez, D. O. ^{[1
]}

Diez-Berart, S. ^{[1
,2
]}

de la Fuente, M. R. ^{[3
]}

Perez-Jubindo, M. A. ^{[3
]}

Veglio, N. ^{[1
]}

机构：

[1] Univ Politecn Cataluna, ETSEIB, Dept Fis & Engn Nucl, LCM GPFM, E-08028 Barcelona, Spain

[2] Kent State Univ, Liquid Crystals Inst, Kent, OH 44242 USA

[3] Univ Basque Country, Fac Ciencias, Dept Fis Aplicada 2, E-48080 Bilbao, Spain

来源：

LIQUID CRYSTALS | 2008年 / 35卷 / 06期

关键词：

Clausius-Clapeyron equation; molar volume; odd-even effect; pressure-temperature diagrams;

D O I：

10.1080/02678290802120273

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Measurements of pressure, molar volume and specific heat as functions of temperature in the isotropic (I) phase as well as in the smectic A (SmA) and nematic (N) mesophases of some alkyloxycyanobiphenyl compounds (nOCB, n=6-10) were carried out using differential thermal analysis under pressure, densitometry, X-ray powder diffraction and modulated differential scanning calorimetry. Thermodynamic properties, such as latent heats and volume jumps at the different phase transitions, were determined. The coherence of this whole set of data was tested using pressure-temperature data through the slopes associated to their phase transitions, extrapolated at normal pressure in the light of the Clausius-Clapeyron equation.

引用

页码：695 / 703

页数：9

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