Thermodynamic Measurements on Selected Liquid Crystals at Normal and Elevated Pressures
| Autor: | S. Masberg, H. Schmalfuss, G. M. Schneider, W. Weissflog, Albert Würflinger |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
Phase transition Materials science Isotropy Enthalpy General Physics and Astronomy Thermodynamics Homologous series chemistry.chemical_compound Chain length chemistry Liquid crystal Tube (fluid conveyance) Physical and Theoretical Chemistry Mathematical Physics Alkyl |
| Zdroj: | Zeitschrift für Naturforschung A. 56:262-266 |
| ISSN: | 1865-7109 0932-0784 |
| DOI: | 10.1515/zna-2001-0306 |
| Popis: | Densities have been determined for two 5-n-alkyl-2-(4-isothiocyanatophenyl)-1,3-dioxanes (6DBT, 10DBT), 4-n-tetradecyl-4'-cyanobiphenyl (14CB), 4-n-octyl-4'-thiocyanatobiphenyl (8BT) and two laterally aryl-branched mesogens 4-cyanobenzyl 5-(4-n-octyloxybenzoyloxy)-2-undecyloxybenzoate (4CNOUB), 3-cyanobenzyl 2,5-bis(4-n-octyloxybenzoyloxy)benzoate (3CN-BOB). The densities have been measured in the isotropic, nematic (only 3CNBOB) and smectic phases with a vibrating tube densimeter. The densities decrease with increasing alkyl chain length within a homologous series. Furthermore the enthalpy changes accompanying the phase transitions have been determined by DSC. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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