Self-assembly of gears at a fluid/air interface |
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Authors: | Ng Jessamine M K Fuerstman Michael J Grzybowski Bartosz A Stone Howard A Whitesides George M |
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Affiliation: | Division of Engineering and Applied Sciences, Pierce Hall, Harvard University, Cambridge, MA 02138, USA. |
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Abstract: | This paper describes a dynamic system-a system that develops order only when dissipating energy-comprising millimeter to centimeter scale gears that self-assemble into a simple machine at a fluid/air interface. The gears are driven externally and indirectly by magnetic interactions; they are made of poly(dimethylsiloxane) (PDMS) or magnetically doped PDMS, and fabricated by soft lithography. Transfer of torque between gears can take place through three different mechanisms: mechanical interaction, hydrodynamic shear, and capillarity/overlap of menisci. Interplay between these forces allows interactions and motions that are not possible with conventional systems of gears. |
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