Parallel Processing

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Science  03 Jan 2003:
Vol. 299, Issue 5603, pp. 21
DOI: 10.1126/science.299.5603.21a

Recipes for the preparation of nanoparticles of various shapes and sizes abound, but, when it comes to making nanoparticles with a narrow distribution of sizes and shapes in large amounts, most methods fail because the precise control of temperature and homogeneous mixing are especially difficult to achieve in rapid reactions.

Nakamura et al. use a micro-reactor to overcome these hurdles in preparing CdSe nanocrystals, which can be used as fluorescent tags and in tunable light-emitting diodes. Using a previously reported method involving precipitation from a surfactant, they demonstrate that their process can generate CdSe nanoparticles continuously and reproducibly, with the capacity to tune the effects of temperature on particle size distributions and fluorescence properties. Parallel operation of these micro-reactors may permit industrial-scale preparation of CdSe and other nanoparticles. — JFU

Chem. Comm. 2002, 2844 (2002).

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