Self-assembly of colloidal pyramids in magnetic fields |
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Authors: | Helseth L E |
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Institution: | School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, Nanyang Technological University, Singapore. |
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Abstract: | We study routes toward the construction of 2D colloidal pyramids. We find that magnetic beads may self-assemble into pyramids near a nonmagnetic 1D 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. |
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