Self-assembly of colloidal pyramids in magnetic fields
Self-assembly of colloidal pyramids in magnetic fields
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DOI：
10.1021/la051140v
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发表时间：
2005-08-02
期刊：
影响因子：
3.9
通讯作者：
Helseth, LE
中科院分区：
文献类型：
--
作者：
Helseth, LE
我们研究了构建二维胶体金字塔的途径。我们发现，只要金字塔中的磁珠数目不超过10个，磁珠就可以在非磁性ID边界附近自组装成金字塔。我们还发现，强磁场梯度可以作为边界，从而帮助磁性胶体在水中自组装，并在一定的磁场范围内观察到稳定的微观金字塔的形成。我们的结果表明，利用外场可以通过多种方式形成胶体金字塔。
We study routes toward the construction of 2D colloidal pyramids. We find that magnetic beads may self-assemble into pyramids near a nonmagnetic ID boundary as long as the number of beads in the pyramid does not exceed 10. We have also found that a strong magnetic field gradient could act as a boundary, thus assisting the self-assembly of magnetic colloids in water, and have observed the formation of stable microscopic pyramids within a certain magnetic field range. Our results indicate that colloidal pyramids can be formed in a number of ways by utilizing external fields.