科研之友
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摘要
We demonstrate the strong dependency of the isotropic-nematic (I-N) transition of discotic suspensions on the aspect ratio (xi = thickness/diameter) via control of the sizes of pristine ZrP crystals and subsequent exfoliation to monolayers. The size fractionation of the I-N transition facilitates the analysis of the effect of polydispersity. A systematic variation in the aspect ratio in the low aspect ratio region (0.001 < xi < 0.01) showed that the I- N transition volume fraction increases with the aspect ratio in agreement with computer simulations. It was found that the transition volume fractions scale with aspect ratio phi(I,N) = m xi(1.36 +/- 0.07), where the prefactor m strongly depends on size polydispersity for phi(N) but does not depend on size polydispersity for fI with fI and fN being the volume fractions of the isotropic and the nematic phases on the cloud curves, respectively.
- 出版日期2012-6-20
