S. Sanchez, Y. F. Mei, and co-workers present the concept of a microfactory on page 2430, where micro-objects are mixed together with synthetic microbots in a fluid and fuel is added in order to power them, as shown in the image. The motion of these microbots is remotely controlled by magnetic field that is an essential requirement for specialized tasks such as transport and delivery of microscale loads.
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Solovev et al. (2010) studied this question.