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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Lab Chip. 2010 Oct 14;11(1):147–151. doi: 10.1039/c0lc00149j

Figure 1.

Figure 1

Self-assembled magnetic filter creates very large magnetic force [~(B·∇)B] to efficiently remove magnetically tagged objects from suspensions. (a) Magnet design. Alternating magnetic dipoles create a magnetic field that decays rapidly in distance. (b) When magnetic materials are allowed to self-assemble, the magnetic moments align into a similar configuration as in (a). This self-assembled layer produces a very strong magnetic field and field gradient. (c) A prototype self-assembled magnetic filter was fabricated that consists of self-assembled layers of 125 µm grain (right) and 8 µm grain (left) permanent magnetic material (NdFeB) with a microfluidic channel built directly on top. A micropore filter is placed on the output to collect and concentrate the cells that are negatively enriched by the self-assembled magnet. (d) A photograph of the prototype.