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jianxian20木虫 (正式写手)
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【资源】交流下：百米碳纳米管 已有3人参与
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《自然—纳米技术》：数百米超长碳纳米管面世 全文下载: 修改好了链接！！！ http://www.namipan.com/d/830.pdf ... 3e910ed8e6423fc0700 电力传输线制造又添新材料 到目前为止，大多数的碳纳米管研究还仅限于小规模的应用。但现在，美国莱斯大学的一个研究团队创建出了长度达几百米、厚度仅为50微米的碳纳米管。研究人员表示，碳纳米管的长度自此将不再是限制，这为碳纳米管用作电力传输线或是作为结构性材料的基础打开了大门。 莱斯大学的项目开始于2001年，由已故诺贝尔奖得主理查德·斯莫利领导。经过多年的努力，科学家们终于发现，一种名为氯磺酸的超强酸可在浓度比别的任何溶剂强1000倍的条件下对碳纳米管进行自然分解。该方法可产生出规则排列的碳纳米管，其中碳纳米管可形成一种类似花洒的喷嘴状。研究人员在最新一期《自然—纳米技术》（Nature Nanotechnology）上公布了酸处理技术的细节。 由于碳纳米管具有很强的传导性，研究人员目前正在制订以此来制作电力传输线的项目。莱斯大学的化学工程教授玛窦·帕斯夸利表示，金属纳米管的导电性强于铜线，质量也更轻 为了制作这种传输线，研究人员需要数量非常多的金属纳米管。虽然目前尚无法批量制造不含任何半导体纳米管的全金属纳米管，但是，这方面的最新研究正在取得良好的成果，研究人员预计，在不远的将来该项技术就可能产生突破。 Nature Nanotechnology" Published online: 1 November 2009 | doi:10.1038/nnano.2009.3024 True solutions of single-walled carbon nanotubes for assembly into macroscopic materials SVirginia A. Davis1,2,6, A. Nicholas G. Parra-Vasquez1,2,7, Micah J. Green1,2,6,7, Pradeep K. Rai1,2,7, Natnael Behabtu1,2, Valentin Prieto1,2, Richard D. Booker1, Judith Schmidt4, Ellina Kesselman4, Wei Zhou5, Hua Fan1, W. Wade Adams1, Robert H. Hauge1,3, John E. Fischer5, Yachin Cohen4, Yeshayahu Talmon4, Richard E. Smalley1,3,8 & Matteo Pasquali1,2,3 Abstract Translating the unique characteristics of individual single-walled carbon nanotubes into macroscopic materials such as fibres and sheets has been hindered by ineffective assembly. Fluid-phase assembly is particularly attractive, but the ability to dissolve nanotubes in solvents has eluded researchers for over a decade. Here, we show that single-walled nanotubes form true thermodynamic solutions in superacids, and report the full phase diagram, allowing the rational design of fluid-phase assembly processes. Single-walled nanotubes dissolve spontaneously in chlorosulphonic acid at weight concentrations of up to 0.5wt%, 1,000 times higher than previously reported in other acids. At higher concentrations, they form liquid-crystal phases that can be readily processed into fibres and sheets of controlled morphology. These results lay the foundation for bottom-up assembly of nanotubes and nanorods into functional materials. 1. Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, USA 2. Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, USA 3. Department of Chemistry, Rice University, Houston, Texas 77005, USA 4. Department of Chemical Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel 5. Department of Material Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA 6. Present address: Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, USA (V.A.D.); Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, USA 7. These authors contributed equally to this work 8. Deceased 28 October 2005 Correspondence to: Matteo Pasquali1,2,3 e-mail: mp@rice.edu [ Last edited by jianxian20 on 2010-1-11 at 09:12 ] |
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