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Pattern formation of drying lyotropic liquid crystalline droplet

机译：干燥增压液晶液滴的图案形成

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摘要

We present a study of pattern formation in drying sessile droplets of aqueous solutions of cetyltrimethylammonium bromide (CTAB)-water system using polarising optical microscopy (POM) and computer simulation. A 4-fold symmetrical and a 3 dimensional staircase like pattern appear during drying of the droplets of the CTAB-water system. However, when NaBr salt is added to the solution, the pattern changes to a system of concentric rings with a fainter set of hyperbolic fringes superimposed on it. The ring width is found to decrease from the central to the peripheral region. We compared the CTAB-water-NaBr pattern with patterns obtained by simulating a 3-dimensional model with various director configurations using a Jones matrix calculation. A good qualitative agreement of the simulated and experimental patterns is obtained for a model assuming a lenticular shaped droplet with the local directors parallel to each other and aligned horizontally, parallel to the fluid-substrate interface. The circular and hyperbolic fringe patterns as well as variation in width of rings are qualitatively reproduced by the simulation. When the droplet dries out completely dendritic crystals form for the CTAB-water droplet as well as the CTAB-water-NaBr droplet. Our results indicate that as the droplet concentration increases with evaporation, elongated cylindrical micelles form which prefer a mutually parallel, horizontal configuration.
机译：我们在使用偏光光学显微镜（POM）和计算机模拟中，展示了在甲基三甲基溴化铵（CTAB） - 水系统水溶液的干燥术液滴中的图案形成研究。在CTAB-水系统的液滴干燥过程中出现4倍对称的和3维楼梯样图案。然而，当向溶液中加入NaBR盐时，图案变为同心环的系统，其叠加在其上具有微弱的双曲线条纹。发现环宽度从外围区域到外围区域的中心减小。我们将CTAB-WATI-NABR模式与通过使用JONES矩阵计算模拟具有各种导向配置的三维模型而获得的模式。对于假设透镜状液滴具有彼此平行的透镜形液滴并水平对准的模型，可以获得良好的模拟和实验模式的良好定性达成的模型和实验模式的良好的定性协议。圆形和双曲线条纹图案以及环宽度的变化是通过模拟定性再现的。当液滴干燥完全树枝状晶体的形式，用于CTAB-水滴以及CTAB-水 - NaBR液滴。我们的结果表明，随着液滴浓度随蒸发而增加，胶束胶束形式，胶片胶束形式更喜欢相互平行的水平构造。

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  • 来源
    《RSC Advances》 |2016年第113期|共9页
  • 作者

    Roy Biswajit; Karmakar Sanat; Giri Abhra; Tarafdar Sujata;

  • 作者单位

    Jadavpur Univ Dept Phys Condensed Matter Phys Res Ctr Kolkata 700032 India;

    Jadavpur Univ Dept Phys Condensed Matter Phys Res Ctr Kolkata 700032 India;

    Jadavpur Univ Dept Phys Condensed Matter Phys Res Ctr Kolkata 700032 India;

    Jadavpur Univ Dept Phys Condensed Matter Phys Res Ctr Kolkata 700032 India;

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  • 正文语种 eng
  • 中图分类 化学;
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