Nano Final Review Questions

Nano Final Review Questions - Fuel Cells What is the target...

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Fuel Cells: What is the target efficiency of a fuel cell? 80% State one advantage and one disadvantage of fuel cells. Advantages: clean, quiet, efficient, renewable Disadvantage: not yet as cost effective as other energy sources What is the difference between an alkaline fuel cell and a proton exchange membrane fuel cell? Alkali fuel cell uses a catalyst to separate hydrogen. Proton exchange membrane fuel cell uses a membrane to separate hydrogen. Nano-composites: • Name one application of nanocomposites. Wilson Double Core ®  tennis rackets. • What is the benefit of Nanocomposite Polymer Electrolytes?  Their production and storage provide superior safety to current wet cells. They also can perform optimally at lower temperatures than other batteries. • What improvements do nanocomposites provide over microcomposites? Increase surface area to volume ratio of smaller particles increases their effectiveness by increasing surface reactions and therefore lowering the necessary loading levels  needed. Nano-lithography: • What limits the feature size that can be produced with conventional non-contact lithography? the wavelength of visible light • Name two nanolithographic techniques that are being developed for future implementation. EUV (extreme ultra-violet) lithography and X-Ray lithography • What is the approximate wavelength of light used in Extreme Ultraviolet (EUV) systems, as used by Intel?
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  • Spring '07
  • Quantum dot, proton exchange membrane, Fuel cell, Quantum well, membrane fuel cell, exchange membrane fuel

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