@article {10.3844/ajassp.2011.147.155,
article_type = {journal},
title = {Positron Annihilation Study on Nickel and Iron Nano-Particles in Natural Rubber Composites},
author = {Aly, Emad Hassan},
volume = {8},
year = {2011},
month = {Feb},
pages = {147-155},
doi = {10.3844/ajassp.2011.147.155},
url = {https://thescipub.com/abstract/ajassp.2011.147.155},
abstract = {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.},
journal = {American Journal of Applied Sciences},
publisher = {Science Publications}
}