Comparison between experiment and theory in the temperature variation of film tension above the bulk isotropic transition in free-standing liquid-crystal films

M. Veum, L. Duelge, J. Droske, H. T. Nguyen, Cheng-Cher Huang, L. V. Mirantsev

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Using differential scanning calorimetry, the transition enthalpies and temperatures for the bulk smectic-isotropic phase transition have been measured for a series of liquid-crystal compounds. For five compounds, those values were used as parameters in a microscopic mean-field model to predict the temperature dependence of the difference in free-energy density between a sample of material in a free-standing smectic film and that in the bulk. The model predicts a weak temperature dependence below the bulk clearing point and a pronounced monotonic increase with temperature above the transition temperature. The compounds used in this study were chosen specifically because they were also the subject of a previous independent experimental study that demonstrated a sudden monotonic increase in the free-standing film tension with temperature, which is qualitatively consistent with the predictions of the above-mentioned mean-field model. This study presents a direct and quantitative comparison between the predictions of the mean-field model and the results from previous tension experiments.

Original languageEnglish (US)
Article number031707
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume80
Issue number3
DOIs
StatePublished - Sep 16 2009

Fingerprint Dive into the research topics of 'Comparison between experiment and theory in the temperature variation of film tension above the bulk isotropic transition in free-standing liquid-crystal films'. Together they form a unique fingerprint.

Cite this