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A high-resolution transmission electron movie of Fe catalyst as a function of gas environment shows Fe particles undergoing reversible shape changes following a switch from He/H2O to Ar/H2O gas at 500°C.

Reference: A.R. Harutyunyan, G. Chen,T.M. Paronyan, E.M. Pigos, O.A. Kuznetsov, K. Hewaparakrama, S.M. Kim, D. Zakharov, E.A. Stach, G.U. Sumanasekera. “Preferential Growth of Single-Walled Carbon Nanotubes with Metallic Conductivity,” Science 326 (2009) pp. 116–120. Abstract

Copyright © 2009, American Association for the Advancement of Science