Methods of treating carbon nanotubes include disposing a plurality of carbon nanotubes in a chamber; reducing a pressure of an atmosphere within the chamber; increasing a temperature within the chamber; and removing gases from interstices within at least some of the plurality of carbon nanotubes. A composition of matter includes a plurality of carbon nanotubes defining interstices therein; an inert gas disposed within at least some of the interstices in the carbon nanotubes; and a matrix material mixed with the plurality of carbon nanotubes.
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