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    Dendritic growth in a two-dimensional smectic E freely suspended film

    Year: 2020

    Journal: Mol. Syst. Des. Eng., Volume 5, MAY 1, page 815–819

    Authors: Yoon, DK; Zhu, C; Kim, YH; Shen, YQ; Jung, HT; Clark, NA

    Organizations: KAIST Grand Challenge 30 Project (KC30); National Research Foundation (NRF) - Korean Government (MIST) [2017R1E1A1A01072798]; MIST; Soft Materials Research Center under the US NSF MRSEC [DMR-1420736]; Pohang University of Science and Technology

    We have investigated the dendritic growth of a freely suspended film of a rod-type molecule forming the smectic E phase from the smectic A phase upon cooling from an isotropic temperature. In contrast to the fractal growing patterns of other smectic liquid phases, this exhibits a clear dendritic growth along with the direction of the molecular unit cell of the smectic E phase. During freezing from the outermost monolayers of the freely suspended film, the sequential dendritic growth occurs based on the confining effect of the preformed outer layers of the smectic E phase. An analysis of the growth law of the characteristic length, i.e., L(t) similar to t(n), shows that the growth process is consistent with the theoretically predicted (n = similar to 0.66) value.
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