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Elastic Behavior of Nanoparticle Chain Aggregates: Proposed Mechanisms

Published online by Cambridge University Press:  10 February 2011

Sheldon K. Friedlander ,
Hee Dong Jang  and
Kevin H. Ryu
Sheldon K. Friedlander
Affiliation:
Department of Chemical Engineering, UCLA, Los Angeles, CA 90095
Hee Dong Jang
Affiliation:
Korea Institute of Geology, Mining and Materials, Taejeon 305-350, Korea
Kevin H. Ryu
Affiliation:
Department of Materials Science and Engineering, UCLA, Los Angeles, CA 90095
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Abstract

Nanoparticle chain aggregates (NCA) of 7 nm titania particles stretch under tension, and contract when the tension is relaxed. The NCA were stretched across expanding holes produced in the carbon film on an electron micrograph grid. After stretching up to 90%, the NCA broke loose at one end and contracted to a tightly folded chain. This pattern was observed in repeated tests. Mechanisms for this behavior and reasons for its generality are proposed. Implications are discussed for the ductility of nanoparticle ceramics, and the improved properties of rubber due to nanoparticle additives.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 520: Symposium P – Nanostructured Powders & Their Industrial Application , 1998 , 45
Copyright
Copyright © Materials Research Society 1998

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