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## Liquid crystal foamAdd to your list(s) Download to your calendar using vCal - Teixeira, P (ISEL and Universidade de Lisboa)
- Wednesday 17 April 2013, 11:00-12:00
- Seminar Room 1, Newton Institute.
If you have a question about this talk, please contact Mustapha Amrani. The Mathematics of Liquid Crystals We investigate whether a liquid crystal foam, made by shearing an ionic mesogen, exhibits the same properties as an ordinary liquid foam. In particular, for a quiescent foam we find: (i) where three walls meet, they do so at approximately 120-degree angles, for all times studied; (ii) Lewiss law of linear relation between cell area and number of sides is approximately satisfied at late times; (iii) the morphological patterns coarsen in time, both T1 and T2 processes are observed and, at late times, evolution is consistent with von Neumanns law; and (iv) relatively large numbers of 5-sided cells survive up to fairly late times. Results (i) and (iii) suggest that surface tension may play a key role in determining the physics of this system, as it does in low-viscosity liquid foams. If our mesogen is subjected to controlled shear, there is a threshold shear rate below which no foam can form. Above this threshold, a steady-state foam pattern is obtained where the mean cell area generally decreases with increasing shear rate. Furthermore, the steady-state internal cell angles and distribution of cell number of sides deviate from their equilibrium (i.e. zero-shear) values. This talk is part of the Isaac Newton Institute Seminar Series series. ## This talk is included in these lists:- All CMS events
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