Aqueous suspensions of elongated, hollow tubules are shown to align in magnetic fields of order 10 G when mixed with a water-based ferrofluid. The tubule’s effective susceptibility anisotropy is obtained, and is found to be six orders of magnitude larger than in the absence of the ferrofluid. A geometry-based model is used to explain this effect.
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Lu et al. (1990) studied this question.
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