Thermodynamics of activated phase transitions of 8CB: DSC and MC calorimetry

Article Abstract:

The heating rate effect on the phase transitions of a pure liquid crystal octylcyanobiphenyl (8CB) is examined with the use of Differential Scanning Calorimetry (DSC) and Modulation Calorimetry (MC) techniques. The comparison of these two techniques has revealed that the MC is a practicable tool for observing the phase dynamics, whereas DSC is a good tool for studying the rate kinematics of the transitions.

United States, Phase transformations (Statistical physics), Phase transitions (Physics), Thermal properties, Thermodynamics

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A phenomenological model of volumetric and free volume hole properties in supercooled liquids: the ortho-terphenyl case

Article Abstract:

A phenomenological model linking the macroscopic volume from dilatometry with the microscopic free volume from positron annihilation lifetime spectroscopy is presented. The temperature depedences of both quantities enable to obtain the initial temperature Ti at which dynamic free volume change sets in, the corresponding initial volume Vi, and subsequently all free volume characteristics.

Spectrum analysis, Spectroscopy

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Liquid crystal properties of the n-alkyl-cyanobiphenyl series from atomistic simulations with ab initio derived force fields

Article Abstract:

Lengthy molecular dynamics (MD) simulations are used to investigate the liquid crystal properties of the series of the 4-n-alkyl-4'-cyanobiphenyls (nCB) (n = 6, 7 and 8) at constant atmospheric pressure and different temperatures. The correlation between molecular properties and odd-even effects, observed for many properties along the nCB series, is presented.

Molecular dynamics, Optical properties, Biphenyl compounds, Biphenyls (Class of compounds), Structure, Alkyl groups, Report

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