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相关概念视频

Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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相关实验视频

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A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries
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通过虚拟磁性模具指导的体组件.

Ahmet F Demirörs1, Pramod P Pillai, Bartlomiej Kowalczyk

  • 1Department of Chemistry and Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, USA.

Nature
|October 22, 2013
PubMed
概括

研究人员开发了一种新的方法,使用磁场微梯度来精确地将数百万个体粒子组装成复杂的结构. 这种多功能技术可以从各种材料中创建永久的单元和多元组件数组和3D组件.

科学领域:

  • 体科学是一种体科学.
  • 材料科学是一种材料科学.
  • 纳米技术 纳米技术

背景情况:

  • 体粒子组件对于光子学,电子,传感器和微镜头的应用至关重要.
  • 目前的方法难以高效地创建复杂的多组件,对称或3D体结构.
  • 现有的技术往往需要系统特定的复杂程序.

研究的目的:

  • 开发一种多功能和高效的方法,以高精度组装大量的体颗粒.
  • 为了克服创建复杂,多元组件和三维体结构的局限性.
  • 证明能够创建永久的合体组件的能力.

主要方法:

  • 使用磁场微梯度在一个磁性流体作为"虚拟模具".
  • 应用这些磁性模具来模拟磁性和非磁性体颗粒的组合.
  • 采用聚合物颗粒,颗粒和活细菌作为组装部件.

主要成果:

  • 通过微米精度将大约10^8个合颗粒组装在一起.
  • 在组装结构中获得80%至90%的高典型产量.
  • 成功生产了单组件和多组件阵列,复杂的3D结构和体分子.
  • 证明了组装结构的持久性.

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  • 展示了2D和3D中非磁性和磁性物体的同时操纵.

    • 结论:

    • 磁场微梯度为合体组装提供了一种强大而通用的模板方法.
    • 这种方法显著提高了创建复杂,大规模的体结构的能力,具有高精度和产量.
    • 该技术可以适应各种粒子类型,并使得永久的,功能性的体材料的创造成为可能.