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Colloidal assembly directed by virtual magnetic moulds

机译：虚拟磁模指导的胶体组装

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摘要

Interest in assemblies of colloidal particles has long been motivated by their applications in photonics, electronics, sensors and microlenses. Existing assembly schemes can position colloids of one type relatively flexibly into a range of desired structures, but it remains challenging to produce multicomponent lattices, clusters with precisely controlled symmetries and three-dimensional assemblies. A few schemes can efficiently produce complex colloidal structures, but they require system-specific procedures. Here we show that magnetic field microgradients established in a paramagnetic fluid can serve as 'Virtual moulds' to act as templates for the assembly of large numbers (～10~8) of both non-magnetic and magnetic colloidal particles with micrometre precision and typical yields of 80 to 90 per cent We illustrate the versatility of this approach by producing single-component and multicomponent colloidal arrays, complex three-dimensional structures and a variety of colloidal molecules from polymeric particles, silica particles and live bacteria and by showing that all of these structures can be made permanent. In addition, although our magnetic moulds currently resemble optical traps in that they are limited to the manipulation of micrometre-sized objects, they are massively parallel and can manipulate non-magnetic and magnetic objects simultaneously in two and three dimensions.
机译：长期以来，人们对胶体颗粒组装的兴趣是由其在光子学，电子学，传感器和微透镜中的应用引起的。现有的组装方案可以将一种类型的胶体相对灵活地定位在一系列所需的结构中，但是生产多组分晶格，具有精确控制的对称性的簇和三维组装仍然是挑战。一些方案可以有效地产生复杂的胶体结构，但是它们需要特定于系统的程序。在此我们发现，顺磁性流体中建立的磁场微梯度可以充当“虚拟模具”，充当组装大量（〜10〜8）非磁性和磁性胶体颗粒的模板，具有微米级的精度和典型的产量占80％到90％的比例，我们通过生产单组分和多组分胶体阵列，复杂的三维结构以及由聚合物颗粒，二氧化硅颗粒和活菌组成的各种胶体分子，并展示了所有这些，说明了这种方法的多功能性建筑物可以做成永久性的。另外，尽管我们的磁性模具目前类似于光阱，因为它们仅限于操纵微米级的物体，但它们却是大规模平行的，可以同时在二维和三维中操纵非磁性和磁性物体。

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  • 来源
    《Nature》 |2013年第7474期|99-103|共5页
  • 作者

    Ahmet F. Demiroers; Pramod P. Pillai; Bartlomiej Kowalczyk; Bartosz A. Grzybowski;

  • 作者单位

    Department of Chemistry and Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry and Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry and Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry and Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);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
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