Self propelled: Chemical tubospheres are produced by loading salt solutions into agarose microbeads and exposing them to a solution of sodium silicate. This process creates hollow tubes that are attached to inorganic shells (see picture). The tubes have inner radii down to 3 μm, reach lengths of 0.5 mm, and grow at speeds of up to 50 μm s−1. Tubes that are pinned to bubbles can induce directional bead motion.
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Makki et al. (2009) studied this question.
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