Abstract
Go with the flow: Extracting useful work from an external diffusive flux at the microscale is challenging. The authors propose a prototype for a microturbine that is powered purely by an external thermal or chemical gradient, due to fore-and-aft asymmetric phoresis. The turbine's rotation is $p\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}p\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}d\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}u\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}r$ to the diffusive flux, and thus precise alignment is unnecessary. This perpendicular-axis phoretic turbine offers possibilities for exploiting ubiquitous thermal or chemical energy at small length scales.
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