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The precise characterisation of boiling in microchannels is essential for the optimisation of applications requiring two phase cooling. In this paper polydimethylsiloxane (PDMS) is employed to make microchannels for characterising microboiling. In particular the material properties of PDMS facilitate rapid prototyping and its optical transparency provides the capability to directly view any fluid...
This paper demonstrates several enhanced microfluidic functions achieved by integrating two different micro droplet actuation systems (Surface Acoustic Waves (SAW) and ElectroWetting-On-Dielectric (EWOD)). The paper reports how SAW can be employed to help EWOD create and split droplets by augmenting the EWOD force to complete the operation. It also demonstrates how EWOD can be used to guide and precisely...
Miniaturized on-chip electrochemical sensors fabricated by MEMS techniques have been demonstrated to have sufficient sensitivity for environmental sample analysis. However, due to the surface cumulative passivation effects, the decreasing sensitivity towards analytical targets has restricted the low-cost and long term applications of these devices. In this paper, a microfluidic electrochemical sensor...
We describe a new label-free biosensor array chip developed for the real-time, simultaneous monitoring of multiple molecular binding reactions. It is composed of monolithically integrated grating couplers, microfluidic channels and spiral cavity silicon photonic wire sensors. The grating couplers use a novel design for coupling to the transverse magnetic mode of a silicon photonic wire. They contain...
This paper presents details of the design and fabrication of test structures specifically designed for the characterisation of two distinct digital microfluidic technologies: Electro-Wetting On Dielectric (EWOD) and Surface Acoustic Wave (SAW). A test chip has been fabricated that includes structures with a wide range of dimensions and provides the capability to characterise enhanced droplet manipulation...
This paper details the first reported integration of two advanced digital microfluidic technologies where 100 mum silicon cubes are transported with electrowetting on dielectric (EWOD) and the droplet then held with EWOD while the silicon cubes are mixed with another liquid using a surface acoustic wave (SAW). Together these two technologies provide a comprehensive lab-on-a-chip combination with well...
This paper discusses the main issues associated with integrating electrode controlled droplet motion using electro wetting on dielectric (EWOD) with IC foundry technology. The motivation behind this approach is based upon the desire to increase the number of control electrodes, which requires the implementation of on-chip line-column microelectronics. Increasing the number of electrodes is attractive...
A thermal microflowmeter has been integrated into a bulk-micromachined recording probe to monitor drug delivery in the central nervous system at the cellular level. The flowmeter uses an arsenic-doped polysilicon heater/sensor supported on a dielectric membrane over the flow channel. It is capped by a vacuum-sealed microchamber to minimize heating of the surrounding tissue and maximize heating efficiency...
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