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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Curvature-driven capillary migration and assembly of rod-like particles
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Curvature-driven capillary migration and assembly of rod-like particles

机译：曲率驱动的毛细管迁移和棒状颗粒的组装

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摘要

Capillarity can be used to direct anisotropic colloidal particles to precise locations and to orient them by using interface curvature as an applied field. We show this in experiments in which the shape of the interface is molded by pinning to vertical pillars of different cross-sections. These interfaces present well-defined curvature fields that orient and steer particles along complex trajectories. Trajectories and orientations are predicted by a theoretical model in which capillary forces and torques are related to Gaussian curvature gradients and angular deviations from principal directions of curvature. Interface curvature diverges near sharp boundaries, similar to an electric field near a pointed conductor. We exploit this feature to induce migration and assembly at preferred locations, and to create complex structures. We also report a repulsive interaction, in which microparticles move away from planar bounding walls along curvature gradient contours. These phenomena should be widely useful in the directed assembly of micro- and nanopar-ticles with potential application in the fabrication of materials with tunable mechanical or electronic properties, in emulsion production, and in encapsulation.
机译：毛细作用可用于将各向异性的胶体粒子引导到精确的位置，并通过使用界面曲率作为施加场来定向它们。我们在实验中证明了这一点，在该实验中，界面的形状是通过钉扎到不同横截面的垂直支柱上而成型的。这些界面提供了定义明确的曲率场，可以沿着复杂的轨迹定向和操纵粒子。轨迹和方向是通过理论模型预测的，其中毛细作用力和扭矩与高斯曲率梯度和与曲率主方向的角度偏差有关。界面曲率在尖锐的边界附近发散，类似于尖导体附近的电场。我们利用此功能在首选位置诱使迁移和组装，并创建复杂的结构。我们还报告了排斥相互作用，其中微粒沿着曲率梯度轮廓从平面边界壁移开。这些现象在微颗粒和纳米颗粒的定向组装中应具有广泛的用途，并可能在机械或电子性能可调的材料的制造，乳液生产和封装中潜在应用。

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  • 作者

    Marcello Cavallaro; Lorenzo Botto; Eric P. Lewandowski; Marisa Wang; Kathleen J. Stebe;

  • 作者单位

    Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 220 South 33rd Street, Philadelphia, PA 19104-6393,Department of Chemical and Biomolecular Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218;

    Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 220 South 33rd Street, Philadelphia, PA 19104-6393;

    Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 220 South 33rd Street, Philadelphia, PA 19104-6393;

    Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 220 South 33rd Street, Philadelphia, PA 19104-6393;

    Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 220 South 33rd Street, Philadelphia, PA 19104-6393;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    anisotropic particles; colloidal interactions; colloidosome; pickering; interracial assemblies;

    机译：各向异性粒子胶体相互作用;胶体采摘异族集会;

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