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Dependence of flow behaviour of nematics in shear on the form of the mean-field potential

✍ Scribed by Minale, Mario ;Apuzzo, Giuseppe ;Greco, Francesco ;Marrucci, Giuseppe

Publisher: Wiley (John Wiley & Sons)
Year: 1993
Weight: 544 KB
Volume: 2
Category: Article
ISSN: 1018-5054
DOI: 10.1002/mats.1993.040020603

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✦ Synopsis

Abstract

The dynamic transition of nematics in (slow) shear from flow‐aligning to tumbling behaviour is here predicted by using the rigid rod‐like molecular model together with an extension of the Maier‐Saupe mean‐field potential. Such an extension, already available in the literature with reference to equilibrium data, includes interactions of rank higher than the basic quadrupolar one considered by Maier and Saupe. The theoretical predictions are then compared with the few existing sets of dynamic data. Although an acceptable qualitative agreement is found, the theory generally overpredicts the value of the relevant ratio α~3~/α~2~ of Leslie coefficients.

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