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This letter presents a highly integrable geometry for microfluidic flow regulators with positive gain. The objective of integration requires membranes to be small in diameter and the total area of the device as reduced as possible. For this, a flexible material is needed, and polydimethylsiloxane (PDMS) was chosen, with a suitable fabrication process designed for it. However, the use of a material...
This paper describes the development of a microfluidic device with embedded capacitive sensing that allows the discrimination of fluids on the basis of the dielectric permittivity. The device is fabricated in a hybrid technology, which innovatively combines PDMS (PolyDiMethylSiloxane) soft photolithography and screen printing techniques. A microchannel, realized in a PDMS layer, is placed in the fringe...
This work demonstrates a new 2-stage valving concept for microfluidic systems based on polydimethylsiloxane (PDMS) that uses the reversible gelation of a thermally responsive polymer solution in a control channel to deflect a membrane into the main flow channel for flow control. This method can control flow through a system of PDMS channels using integrated electric heating elements and only one control...
We demonstrate a planar direct methanol fuel cell by integrating a 200 mum-wide Nafion strip in a polydimethylsiloxane (PDMS) structure. The design is based on two 200 mum-wide parallel microfluidic channels, sandwiching the Nafion strip. We mechanically clamp the PDMS/ Nafion assembly with a catalyst-covered glass chip and use 1 M CH3OH/ 0.5 M H2SO4 as fuel in the anodic channel and O2-saturated...
A thermopneumatic microvalve for switching fluid in a microchannel of PDMS based microfluidic chip was designed and fabricated from multi-stack PDMS structure on a glass substrate. Microvalve structure consists of inlet and outlet, microchannel, a thermopneumatic actuation chamber, and a thin film heater. In microchannel, fluid is blocked or passed by the motion of actuation diaphragm. Actuation diaphragm...
We have successfully demonstrated the fabrication of biodegradable and magnetic microcapsules utilizing PDMS double emulsification devices. Specially designed 3D microfluidic channels with surface modified by a self-aligned photo-grafting process are employed to shape immiscible fluids into monodisperse W/O/W emulsions. By varying the outer and inner fluid flow-rates, the overall and core sizes of...
Presently, with the development of nanofabrications, patterning nanoparticles into monolayer attracts tremendous interests. In this work, a microfluidic-assisted nanoparticle monolayer patterning approach was proposed to produce noncontinuous patterns based on the well-known continuity equation in fluid mechanics. Soft-lithography used in this approach greatly reduced the cost and time of the fabrication...
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