Research Article Open Access

Positron Annihilation Study on Nickel and Iron Nano-Particles in Natural Rubber Composites

Emad Hassan Aly1
  • 1 Department of Physics, Faculty of Science, Ain Shams University, P.O. Box 11566, Abbassia, Cairo, Egypt


Problem statement: The effect of Ni and Fe nano-particles as a filler on the free volume properties Of Natural Rubber (NR) was studied using Positron Annihilation Lifetime Spectroscopy (PALS). Approach: The PAL measurements revealed that the free volume properties are strongly affected by the amount and type of filler. Results: Particularly speaking, the free volume fraction dramatically decreased by increasing the filler content. Besides, the addition of nano-prticles created new positron trapping sites at filler-rubber interfaces. Furthermore, correlations were made between the free volume hole sizes (Vh) and each of the mechanical and electrical properties successively. A negative correlation was observed between Vh and hardness in the Ni-rubber composites while a positive counterpart was found in the case of Fe-rubber composites. Finally, the polarity of the fillers, being higher than that of the rubber itself, leads to an increase in electrical parameters and an inhibition of o-Ps formation. Conclusion: These results indicate that the investigated composites are considered to be insulating materials as their conductivity values are in the order of an insulator range.

American Journal of Applied Sciences
Volume 8 No. 2, 2011, 147-155


Submitted On: 15 February 2011 Published On: 28 February 2011

How to Cite: Aly, E. H. (2011). Positron Annihilation Study on Nickel and Iron Nano-Particles in Natural Rubber Composites. American Journal of Applied Sciences, 8(2), 147-155.

  • 14 Citations



  • Free volume
  • crosslinking density
  • tensile strength
  • dielectric loss
  • Natural Rubber (NR)
  • Positron Annihilation Lifetime Spectroscopy (PALS)
  • Rubber Ferrite Composites (RFC)
  • nanoscopic inorganic
  • polymer nanocomposites
  • Polymer Bonded Magnets (PBMs)