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Unprecedented levels of internal order are obtained in multiwalled carbon nanotubes grown by chemical vapor deposition with a nitrogen‐doping level of 3% in work reported by Windle and co‐workers on p. 760. Not only is each of the tubular layers of the same orientation (chirality), but they also appear to be in three‐dimensional crystallographic register with one another as shown by the hkl reflections on the cover. The tubes are also straighter and thicker than pure carbon equivalents. The layers are either pure zigzag or pure armchair with spacings close to that of graphite. 相似文献
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W. Fang H.‐Y. Chu W.‐K. Hsu T.‐W. Cheng N.‐H. Tai 《Advanced materials (Deerfield Beach, Fla.)》2005,17(24):2987-2992
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L.‐Q. Liu D. Tasis M. Prato H. D. Wagner 《Advanced materials (Deerfield Beach, Fla.)》2007,19(9):1228-1233
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L. Lacerda A. Soundararajan R. Singh G. Pastorin K. T. Al‐Jamal J. Turton P. Frederik M. A. Herrero S. Li A. Bao D. Emfietzoglou S. Mather W. T. Phillips M. Prato A. Bianco B. Goins K. Kostarelos 《Advanced materials (Deerfield Beach, Fla.)》2008,20(2)
Multiwalled carbon nanotubes (MWNTs) made highly water‐dispersible by organic functionalization and radiolabeled with Indium‐111 were shown to translocate through the kidney glomerular filter. On p. 225, multinational, multicenter research led by Kostas Kostarelos on dynamic imaging and tissue distribution of MWNTs in live animals is presented. The cover image presents a single plane single photon computed tomography whole body image of a rat following intravenous injection with the In‐111 labeled MWNTs as seen through a 3D carbon NT projection. The radioactivity from carbon NTs was mainly localized in the kidneys, and accumulated in the bladder before clearance in the urine. 相似文献
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ABSTRACTIn this study, crack generation and propagation during γ-austenite to α-ferrite phase transformation in Nb-microalloyed steel is observed. The relationship among the cracks, α-ferrite phase, and precipitate is discussed. The effects of the α-ferrite phase and precipitates on the hot ductility are discussed based on the experimental results and thermodynamic calculations. According to the mechanism of synergistic effects, microcracks begin to nucleate at the precipitate/α-ferrite phase interface. This is mainly due to stress concentration near the phase boundary between the soft phase ferrite and the hard phase precipitate. The microcracks grow faster along the γ/α phase boundary than α/α grain boundary. The growth rates are 1.67 and 0.83?µm?s?1, for the γ/α and the α/α grain boundaries, respectively. 相似文献
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Z.‐M. Dang L. Wang Y. Yin Q. Zhang Q.‐Q. Lei 《Advanced materials (Deerfield Beach, Fla.)》2007,19(6):852-857