English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Starting with a model intermolecular potential that includes $\stackrel{^}{\ensuremath{\Omega}}\ifmmode\cdot\else\textperiodcentered\fi{}\stackrel{^}{r}$ terms to account for anisotropic steric interactions, we carry out a statistical mechanical calculation in the cell approximation, and apply it specifically to the isotropic-nematic transition of methoxybenzylidene butylaniline (MBBA). The potential is determined to fit the experimental transition temperature ${T}_{\mathrm{IN}}$ and the discontinuity in the orientational order parameter $〈{P}_{2}〉$ at transition. $〈{P}_{2}〉$ and $〈{P}_{4}〉$ are then calculated from solving a set of coupled self-consistency equations for the orientational and spatial parts of the distribution function, as are other phase-transition properties. There are improvements over model calculations which do not account for anisotropic steric effects, but the improvements are generally less than significant. The most striking result is that a stable nematic phase requires $〈{P}_{4}〉$ to be negative at and near the transition. It is a theoretical result qualitatively consistent with experimental data but has not been attained until now.

physical review. a, general physics

Anisotropic steric effects and negative<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>〈</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>〉</mml:mi></mml:math>in nematic liquid crystals

Anisotropic steric effects and negative〈P4〉in nematic liquid crystals