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Minute viscoelastic observation in isotropic-nematic phase transition of 7CB with a thousandth Kelvin resolution

Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, ISSN: 0021-4922, Vol: 38, Issue: 6 A, Page: 3611-3614
1999
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Article Description

The temperature dependence of the shear viscosity η for homeotropically aligned liquid crystals, 4-n-heptyl-4′-cyanobiphenyl (7CB) at 10 MHz was observed in the immediate vicinity of the isotropic-nematic phase transition with a thousandth Kelvin resolution by the piezoelectric composite resonator method. The transition process shows a clear hysteresis between heating and cooling processes. Furthermore, there is an interesting behavior of η only during the cooling process; the value of η suddenly decreases and then increases in a very narrow temperature region of 32 mK.

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