Abstract
The dispersion of nanoparticles in nanocomposites of an epoxy matrix reinforced with alumina (10nm) and zinc oxide (100nm) is analyzed using FIB/FESEM images, varying the volumetric fraction of fillers from 0.2 % to 6.0 %. The nanofillers dispersion images were transformed to binary files and the multifractal spectrum was calculated. From these data the relation between agglomerate and individual particle dimensionalities related to the interphase percolation was investigated. Interphase percolation of nanocomposites should be achieved when the dimensionality of agglomerations is greater than the dimensionality of individual particles. The actual percolation state of the interphase is determined, matching the experimental nanocomposites behavior for electrical behavior at AC and dielectric breakdown at DC.
Highlights
One of the most important issues related to nanocomposites is the interphase
For multifractal analysis of the images, an agglomerate of nanoparticles can be described as a cluster, in this case, the volumetric fraction of fillers is similar to the probability for an occupied site or black pixel in treated image
Multifractal analysis can be used to describe the dispersion state of nanofillers and it will be applied here to determine the percolation of the interphase
Summary
One of the most important issues related to nanocomposites is the interphase. It is a region around the nanoparticles where properties are somehow different from the matrix and from the nanoparticle. At a very low volumetric fraction of nanoparticles, this region can be percolated the material. In polymeric matrices with carbon nanotubes, percolation can be reached at 0.1 %. Aspect ratio is an important issue for 1-D tubular structure such as carbon nanotubes. It is interesting to see recently the use of tomography to study the percolation threshold in nanocomposites[1,2,3]
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