Abstract
ABSTRACT We investigated experimentally the viscoelastic properties of MoS2 nanotubes mixed with liquid crystal 8CB in the nematic phase. The MoS2 nanotubes were dispersed with ultra-sound in ethanol and then mixed with liquid crystal; then the ethanol was evaporated. Dynamic light scattering (DLS) was used to measure the viscoelastic coefficients of the mixture in its nematic phase from the SmA-N up to the N-I phase transition. The relaxation time τ of orientational fluctuations depends on the concentration of dispersed MoS2 nanotubes in liquid crystal, temperature and orientation of the director. By measuring the dependence of τ as a function of the scattering wave vector q, the ratio K 1/η1 and K 3/η3 were obtained (K i - Frank elastic constants, η i - effective viscosities). Comparison of the obtained results with the values of K i /η i of pure 8CB liquid crystal shows that the ratios K 1/η1 and K 3/η3 decrease with increasing concentration of the MoS2 nanotubes.
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