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  • 1
    Electronic Resource
    Electronic Resource
    Thermochemical Passivation of DNA-Stabilized Q-Cadmium Sulfide Nanoparticles (2000)
    Springer
    Journal of cluster science 11 (2000), S. 359-372 
    Details
    ISSN: 1572-8862
    Keywords: cadmium sulfide ; quantum dots ; DNA stabilized
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this work, the conditions required to transform quantum-confined cadmium sulfide (Q-CdS) nanoparticles stabilized by calf thymus deoxyribonucleic acid from deep trap photoluminescent states to “band edge”-type luminescence are probed. The presence of fivefold excess sulfide relative to cadmium concentration during cluster synthesis, followed by mild heating at 80°C, results in the desired transformation of the Q-CdS emission spectrum. We also indirectly analyze the accompanying structural changes in the polymeric stabilizer, accomplished in this case by use of well-known spectrofluorometric methods with the dyes ethidium bromide and trisphenanthroline ruthenium(II).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009049823345
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    Paper (German National Licenses)
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  • 2
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    Flow Energy Piezoelectric Bimorph Nozzle Harvester (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-08-26
    Description: There is a need for a long-life power generation scheme that could be used downhole in an oil well to produce 1 Watt average power. There are a variety of existing or proposed energy harvesting schemes that could be used in this environment but each of these has its own limitations. The vibrating piezoelectric structure is in principle capable of operating for very long lifetimes (decades) thereby possibly overcoming a principle limitation of existing technology based on rotating turbo-machinery. In order to determine the feasibility of using piezoelectrics to produce suitable flow energy harvesting, we surveyed experimentally a variety of nozzle configurations that could be used to excite a vibrating piezoelectric structure in such a way as to enable conversion of flow energy into useful amounts of electrical power. These included reed structures, spring mass-structures, drag and lift bluff bodies and a variety of nozzles with varying flow profiles. Although not an exhaustive survey we identified a spline nozzle/piezoelectric bimorph system that experimentally produced up to 3.4 mW per bimorph. This paper will discuss these results and present our initial analyses of the device using dimensional analysis and constitutive electromechanical modeling. The analysis suggests that an order-of-magnitude improvement in power generation from the current design is possible.
    Keywords: Electronics and Electrical Engineering
    Type: SPIE Smart Structures and Non-Destructive Evaluation; Mar 09, 2014 - Mar 13, 2014; San Diego, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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