Activation volume of selected liquid crystals in the density scaling regime
PBN-AR
Instytucja
Wydział Matematyki, Fizyki i Chemii (Uniwersytet Śląski w Katowicach)
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
SCIENTIFIC REPORTS OF THE NATURE PUBLISHING GROUP (40pkt w roku publikacji)
ISSN
2045-2322
EISSN
Wydawca
DOI
URL
Rok publikacji
2017
Numer zeszytu
42174
Strony od-do
1-13
Numer tomu
7
Identyfikator DOI
Liczba arkuszy
1
Autorzy
Pozostali autorzy
+ 2
Streszczenia
Język
angielski
Treść
In this paper, we demonstrate and thoroughly analyze the activation volumetric properties of selected liquid crystals in the nematic and crystalline E phases in comparison with those reported for glass-forming liquids. In the analysis, we have employed and evaluated two entropic models (based on either total or configurational entropies) to describe the longitudinal relaxation times of the liquid crystals in the density scaling regime. In this study, we have also exploited two equations of state: volumetric and activation volumetric ones. As a result, we have established that the activation volumetric properties of the selected liquid crystals are quite opposite to such typical properties of glass-forming materials, i.e., the activation volume decreases and the isothermal bulk modulus increases when a liquid crystal is isothermally compressed. Using the model based on the configurational entropy, we suggest that the increasing pressure dependences of the activation volume in isothermal conditions and the negative curvature of the pressure dependences of isothermal longitudinal relaxation times can be related to the formation of antiparallel doublets in the examined liquid crystals. A similar pressure effect on relaxation dynamics may be also observed for other material groups in case of systems, the molecules of which form some supramolecular structures.
Cechy publikacji
original-article
Inne
System-identifier
3342800135234
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