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Interfacial Particle Bonding Via an Ultrathin Polymer Film on Al2O3 Nanoparticles by Plasma Polymerization

Published online by Cambridge University Press:  31 January 2011

Donglu Shi
Affiliation:
Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221–0012
Peng He
Affiliation:
Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221–0012
S. X. Wang
Affiliation:
Department of Nuclear Engineering and Radiological Science, University of Michigan, Ann Arbor, Michigan 48109
Wim J. van Ooij
Affiliation:
Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221–0012
L. M. Wang
Affiliation:
Department of Nuclear Engineering and Radiological Science, University of Michigan, Ann Arbor, Michigan 48109
Jiangang Zhao
Affiliation:
Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221–0012
Zhou Yu
Affiliation:
Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221–0012
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To study interfacial particle-to-particle bonding mechanisms, an ultrathin film of pyrrole was deposited on alumina nanoparticles using a plasma polymerization treatment. High resolution transmission electron microscopy experiments showed that an extremely thin film of the pyrrole layer (2 nm) was uniformly deposited on the surfaces of the nanoparticles. In particular, the particles of all sizes (10–150 nm) exhibited equally uniform ultrathin films indicating well-dispersed nanoparticles in the fluidized bed during the plasma treatment. Time-of-flight secondary ion mass spectroscopy experiments confirmed the nano-surface deposition of the pyrrole films on the nanoparticles. The pyrrole-coated nanoparticles were consolidated at a temperature range (approximately 250 °C) much lower than the conventional sintering temperature. The density of consolidated bulk alumina has reached about 95% of the theoretical density of alumina with only a few percent of polymer in the matrix. After low-temperature consolidation, the micro-hardness test was performed on the bulk samples to study the strength that was related to particle-particle adhesion. The underlying adhesion mechanism for bonding of the nanoparticles is discussed.

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Copyright © Materials Research Society 2002

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Interfacial Particle Bonding Via an Ultrathin Polymer Film on Al2O3 Nanoparticles by Plasma Polymerization
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