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This paper introduces a class of single crystal silicon micro-scale differential scanning calorimeters for rapid detection and thermal characterization of energetic materials. The suspended membrane micro hotplates have fast time response and high sensitivity, which enables thermal measurements of melting endotherms and deflagration exotherms in energetic materials such as RDX and TNT. The potential...
This paper introduces an array of single crystal silicon micro hotplates for differential scanning calorimetry. Based on heat transfer analysis considering tradeoffs between response time, temperature uniformity, and measurement sensitivity, suspended membrane micro hotplates with full backside release were found to be optimal designs. Due to the requirements of routine sample loading, the size of...
A microneedle array has been fabricated and applied to the measurement of transdermal skin potentials in human subjects. Potential changes were recorded in the vicinity of superficial wounds, confirming the generation of a lateral electric field in human skin. The measured electric field decays with distance from the wound edge, and is directed towards the wound. The measurement of endogenous fields...
This paper presents the design, fabrication and testing of a hollow microneedle array with integrated, fluidic microchannels. The microneedles are machined from single crystal silicon to a shank height of 250-350μm with 300μm center-to-center spacing. The needle size, density and shape are controlled by independent processing steps. Piercing of the protective stratum corenum layer of the skin by the...
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