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Issue 18, 2011
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Splay-bend elasticity and rotational viscosity of liquid crystal mixtures of rod-like and bent-core molecules

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Abstract

We report temperature dependent measurements of birefringence (Δn), splay (K11), bend (K33) elastic constants and rotational viscosity (γ1) of mixtures of rod-like and bent-core molecules. K11 and Δn remain almost constant for all the mixtures whereas K33 is always lower than K11 and further decreases with increasing concentration of bent-core molecules in the mixtures. Apart from the large jump in Δn at the nematic-isotropic transition (NI) a significant jump in Δn at the nematic-smectic transition (NS) is also observed that increases with increasing mol% of the bent-core compound in the mixtures. Rotational viscosity increases by a factor of four when the concentration of the bent-core compound increased from 0 to 10 mol%. The results are discussed on the basis of their structural similarity and mutual alignment in the nematic phase.

Graphical abstract: Splay-bend elasticity and rotational viscosity of liquid crystal mixtures of rod-like and bent-core molecules

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Publication details

The article was received on 25 Apr 2011, accepted on 23 Jun 2011 and first published on 01 Aug 2011


Article type: Paper
DOI: 10.1039/C1SM05751K
Citation: Soft Matter, 2011,7, 8556-8560
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    Splay-bend elasticity and rotational viscosity of liquid crystal mixtures of rod-like and bent-core molecules

    P. Sathyanarayana, B. K. Sadashiva and S. Dhara, Soft Matter, 2011, 7, 8556
    DOI: 10.1039/C1SM05751K

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