The rheological and electrical properties of composites formed by filling high density polyethylene (HDPE) with carbon black (CB) were characterized. Nonuniversal electrical behavior was observed with critical exponent t of 2.9 for the composites. The phenomenon was interpreted in terms with tunneling-percolation model. The effects of shearing frequency and particle concentration on the rheological behavior of the composites were investigated. A second plateau of storage modulus and strong shear thinning behavior were observed at low frequencies induced by aggregation of fillers. And the rheological percolation threshold is found to coincide well with the electrical one.
Bi2S3 flowerlike patterns were synthesized via a facile hydrothermal approach without using any surfactant and acid. The morphology, structure, phase composition, of the as-prepared Bi2S3 products were characterized using scanning electron microscopy, X-ray diffraction, high-resolution transmission and electron microscopy, respectively. The experimental results showed that the product possesses good distribution of morphology, well crystallized nanostructure.
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