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  • American Association for the Advancement of Science (AAAS)  (2)
  • American Institute of Physics (AIP)
  • 2000-2004  (2)
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  • 1
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    Ferroelectricity in free niobium clusters (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-05-24
    Description: Electric deflections of gas-phase, cryogenically cooled, neutral niobium clusters [NbN; number of atoms (N) = 2 to 150, temperature (T) = 20to 300kelvin], measured in molecular beams, show that cold clusters may attain an anomalous component with very large electric dipole moments. In contrast, room-temperature measurements show normal metallic polarizabilities. Characteristic energies kBTG(N) [Boltzmann constant kB times a transition temperature TG(N)] are identified, below which the ferroelectric-like state develops. Generally, TG decreases [110 〉 TG(N) 〉 10K] as N increases, with pronounced even-odd alternations for N 〉 38. This new state of metallic matter may be related to bulk superconductivity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Moro, Ramiro -- Xu, Xiaoshan -- Yin, Shuangye -- de Heer, Walt A -- New York, N.Y. -- Science. 2003 May 23;300(5623):1265-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Physics, Georgia Institute of Technology, Atlanta GA, 30332-0430, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12764191" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Carbon nanotubes--the route toward applications (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-08-06
    Description: Many potential applications have been proposed for carbon nanotubes, including conductive and high-strength composites; energy storage and energy conversion devices; sensors; field emission displays and radiation sources; hydrogen storage media; and nanometer-sized semiconductor devices, probes, and interconnects. Some of these applications are now realized in products. Others are demonstrated in early to advanced devices, and one, hydrogen storage, is clouded by controversy. Nanotube cost, polydispersity in nanotube type, and limitations in processing and assembly methods are important barriers for some applications of single-walled nanotubes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baughman, Ray H -- Zakhidov, Anvar A -- de Heer, Walt A -- New York, N.Y. -- Science. 2002 Aug 2;297(5582):787-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉NanoTech Institute, University of Texas at Dallas, Richardson, TX 75083-0688, USA. ray.baughman@utdallas.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12161643" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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