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Dense arrays of well-aligned carbon nanotubes completely filled with single crystalline titanium carbide wires on titanium substrates (1999)

Gao, Y. ; Liu, J. ; Shi, M. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 74 (1999), S. 3642-3644

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We report the synthesis of dense and uniform arrays of well-aligned carbon nanotubes on titanium substrates over large areas, in which all the tubes are simultaneously and completely filled with single crystals of titanium carbide. The carbon nanotubes were synthesized by thermal chemical vapor deposition of ethylene on iron-coated substrates, while the titanium carbide was simultaneously formed inside the nanotubes through a simultaneous solid state reaction. We propose a base dissolution and precipitation mechanism for the growth of titanium carbide filled carbon nanotubes. The same method can be used to fabricate oriented nanotube arrays filled with other carbides on a variety of substrates over large scale. Such well-aligned and densely packed uniform carbon nanotubes, completely filled with nanowires on conducting substrates, will have great potential in many applications. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.123208

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Preparation of mesoporous spherulites in surfactant solutions (1995)

Liu, J. ; Kim, A. Y. ; Virden, J. W.

Springer

Journal of porous materials 2 (1995), S. 201-205

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ISSN: 1573-4854

Keywords: spherulite ; mesoporous ; silicate ; sphere

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract A new mesoporous structure, silicate spherulite, has been produced in dilute surfactant and silicate solutions. The spherulites were formed from radially arranged rod-like micelles. The surfactant molecules in the rod-like micelles can be removed by heat treatment to leave a unique mesoporous material with radially arranged channels for easy access. Although the spherulite morphology has been observed in the nucleation and growth of polymeric crystals for a long time, it has not been reported in surfactant solutions. Similar to the polymeric materials, the surfactant spherulites are most likely the fingerprints of the early nucleation process in the preparation of ordered mesophase silicates.