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In this chapter, we discuss the proton conductivity and use of heteropoly acids (HPAs) in proton exchange fuel cells. We first review the fundamental aspects of proton conduction in the HPAs and then review liquid HPA-based fuel cells. Four types of composite proton exchange membranes containing HPAs have been identified: HPAs imbibed perfluorosulfonic acid membranes, HPAs imbibed hydrocarbon membranes,...
We describe a substrate for a Legged Chip, a CMOS integrated circuit with built in actuation mechanisms for motion. We have designed and fabricated a custom integrated circuit using a commercial 0.5µm CMOS technology which implements walking gait control. The circuit specifications and physical implementation have been designed to take into consideration the addition of thermal actuators through low-temperature...
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