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M. M. NYSHCHENKO, G. Yu. MIKHAYLOVA, E. I. ARKHIPOV, V. Yu. KODA, G. P. PRIKHOD’KO, and Yu. I. SEMENTSOV
«Electric Conductivity of Mechanical Mixture of Carbon Nanotubes and Thermally Extended Graphite at Different Concentrations and Degrees of Compression»
PACS numbers: 61.48.De, 72.60.+g, 72.80.Tm, 73.63.Fg, 81.05.ub, 81.07.Oj, 81.40.Rs
Change in conductivity ?(?) of mixture of superelastic multiwall carbon nanotubes (MWCNT) and plastic thermoexpanded graphite (TEG) in cylinder with piston is studied under compression and unloading. Direct percolation transition (PT) appears at compression, and ?(?) increases due to increase of electric-contacts number in mixture, then it decreases due to elastic deformation of MWCNT. Restructuring under compression completes at density of 0.35–0.55 g/cm3. During unloading, conductivity restores to maximum value due to elastic properties of MWCNT, then it falls sharply (reverse percolation transition). Within the MWCNT–TEG mixture, direct PT decreases twice (as compared with PT in MWCNT and in TEG) to value of 0.05–0.06 g/cm3. This testifies that structure loosens. Appear of hysteresis between direct and reverse transitions is caused by non-elastic processes during deformation.