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Filling of Chrysotile Nanotubes with Metals

Published online by Cambridge University Press:  31 January 2011

C. Métraux ,
B. Grobéty  and
P. Ulmer
C. Métraux
Affiliation:
University of Fribourg, Institute of Mineralogy and Petrography, 1700 Fribourg, Switzerland
B. Grobéty
Affiliation:
University of Fribourg, Institute of Mineralogy and Petrography, 1700 Fribourg, Switzerland
P. Ulmer
Affiliation:
Eidgenössishe Technische Hochschule Zürich, Institute of Mineralogy and Petrography, 8052 Zürich, Switzerland
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Extract

Nanowires were produced by injection of molten Hg and Pb into chrysotile nanotubes. The breakdown of chrysotile and the surface tension of the molten metals are the limiting factors for the filling procedure. The thermal stability of chrysotile nanotubes was investigated by infrared spectrometry, thermogravimetry, differential thermal analysis, and x-ray diffraction analyses. For short-term thermal annealing (30 min) the tube morphology remains stable up to 700 °C. The high surface tension of both molten Pb and Hg (γLV > 200 mN/m) requires external pressure for the melts to penetrate into the tubes. Filling of the tubes was achieved under high pressure and high temperature conditions compatible with the stability range for chrysotile determined in the annealing experiments. Transmission electron microscopy observations confirmed high filling yields for both metals. Almost all nanotubes were partially filled with lead. The length of continuous wires ranged from tens to hundreds of nanometers. Additional experiments with tin were not successful.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 1129 - 1135
Copyright
Copyright © Materials Research Society 2002

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