Accession Number : ADA516937


Title :   Changes to Electrical Conductivity in Irradiated Carbon-Nickel Nanocomposites


Descriptive Note : Master's Thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Coy, David F


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a516937.pdf


Report Date : Mar 2010


Pagination or Media Count : 100


Abstract : Pre and post irradiation resistivity and XAFS measurements have been conducted to examine the effects of 0.5 MeV electron irradiation on nickel-carbon composites. Results showed a decrease in surface resistivity following irradiation and a corresponding decrease in NiO content for the irradiated samples as compared to pre-irradiation measurements and non-irradiated samples. Surface resistivity measurement capabilities were established and measurement techniques refined to produce repeatable results of sufficient precision to discern changes in resistivity for fluence levels of 2 x 10-16 cm-2 and greater. Measured changes in surface resistivity were found to be consistent with studies on the radiation effects on electrical properties of polymers similar to the epoxies used in fabricating the composites studied here. The materials examined showed changes of 30% or less following irradiation with 0.5 MeV electrons to a total electron fluence of to 4 x 1016 cm-2. The data showed no discernable link between irradiation changes to surface resistivity and epoxy type used.


Descriptors :   *ELECTRICAL CONDUCTIVITY , *NICKEL , *CARBON , RESISTANCE , EPOXY COMPOUNDS , ELECTRICAL PROPERTIES , RADIATION EFFECTS , MEASUREMENT , REPRODUCIBILITY , IRRADIATION , POLYMERS , METHODOLOGY , ELECTRONS


Subject Categories : Inorganic Chemistry
      Laminates and Composite Materials
      Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE