Journal
SOFT MATTER
Volume 7, Issue 18, Pages 8556-8560Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1sm05751k
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Funding
- UGC-CAS School of Physics
- CSIR-UGC
- Indian National Science Academy, New Delhi
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We report temperature dependent measurements of birefringence (Delta n), splay (K-11), bend (K-33) elastic constants and rotational viscosity (gamma(1)) of mixtures of rod-like and bent-core molecules. K-11 and Delta n remain almost constant for all the mixtures whereas K-33 is always lower than K-11 and further decreases with increasing concentration of bent-core molecules in the mixtures. Apart from the large jump in Delta n at the nematic-isotropic transition (NI) a significant jump in Delta n 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.
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