An optopneumatic piston for microfluidics
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We demonstrate an optopneumatic piston based on glass capillaries, a mixture of PDMS-carbon nanopowder, silicone and mineral oil. The fabrication method is based on wire coating techniques and surface tension-driven instabilities, and allows for the assembly of several pistons from a single batch production. By coupling the photothermal response of the PDMS-carbon mixture with optical excitation via an optical fiber, we demonstrate that the piston can work either as a valve or as a reciprocal actuator. The death volume of the pistons was between 0.02 and 1.56 μL and the maximum working frequency was around 1 Hz. Analysis of the motion during the expansion/contraction of the piston shows that this machine can be described by a phenomenological equation analogous to the Kelvin-Voight model used in viscoelasticity, having elastic and viscous components. © The Royal Society of Chemistry 2015.
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carbon; dimeticone; glass fiber; mineral oil; silicone; Article; artificial membrane; capillary; composite material; diode laser; energy conservation; energy conversion; energy transfer; excitation; general device; heat transfer; hydrodynamics; microfluidics; micromanipulation; microtechnology; molecular weight; motion; optics; optopneumatic piston; particle size; power supply; priority journal; reaction time; surface tension; thermogenesis; viscoelasticity; water supply
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