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. Author manuscript; available in PMC: 2012 Nov 25.
Published in final edited form as: J Am Chem Soc. 2006 Jun 21;128(24):7938–7946. doi: 10.1021/ja0612854

Figure 1.

Figure 1

Scheme showing the synthesis of magnetic amphiphilic porous Si microparticles. A spectral bar-code (“encoding layer”) is first etched into the single-crystal Si substrate. The porous Si film is then hydrosilylated to generate a chemically stable hydrophobic layer. A porous host layer for magnetite loading is then etched into the substrate immediately beneath the encoding layer. The entire structure is then removed from the substrate by application of a current pulse. Magnetite nanoparticles are loaded into the porous host layer followed by thermal oxidation at low temperature to impart hydrophilic character to the magnetic layer. Finally, the magnetic film is placed in acetone and fractured into micrometer-sized particles by brief ultrasonication.