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25 April 2024 |
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Elasticity and Viscosity of a Lyotropic Chromonic Nematic Studied with Dynamic Light Scattering | | Yu. A. Nastishin
; K. Neupane
; A. R. Baldwin
; O. D. Lavrentovich
; S. Sprunt
; | | Date: |
17 Jul 2008 | | Abstract: | Using dynamic light scattering, we measure for the first time the
temperature-dependent elastic moduli and associated orientational viscosity
coefficients of the nematic phase in a self-assembled lyotropic chromonic
liquid crystal. The bend K3 and splay K1 moduli are an order of magnitude
higher than the twist K2 constant. The ratio K3/K1 shows an anomalous increase
with temperature; we attribute this to the shortening of the aggregates as
temperature increases. The viscosity coefficients also show a significant
anisotropy, as well as a strong temperature dependence; in particular, the bend
viscosity is three orders of magnitude smaller than the splay and twist
viscosities. | | Source: | arXiv, 0807.2669 | | Services: | Forum | Review | PDF | Favorites | |
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