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Why Structure Matters – Controlling the Properties of Nanoparticle Hybrid Materials

Published online by Cambridge University Press:  01 February 2011

Jihoon Choi ,
Hongchen Dong ,
Kris Matyjaszewski  and
Michael R Bockstaller
Jihoon Choi
Affiliation:
jihoonc@andrew.cmu.edu, Carnegie Mellon University, Materials Science and Enineering, Pittsburgh, Pennsylvania, United States
Hongchen Dong
Affiliation:
hdong@andrew.cmu.edu, Carnegie Mellon Unviversity, Department of Chemistry, Pittsburgh, Pennsylvania, United States
Kris Matyjaszewski
Affiliation:
km3b@andrew.cmu.edu, Carnegie Mellon University, Department of Chemistry, Pittsburgh, Pennsylvania, United States
Michael R Bockstaller
Affiliation:
bockstaller@cmu.edu, Carnegie Mellon University, Department of Materials Science and Engineering, Pittsburgh, Pennsylvania, United States
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Abstract

The complementary physical properties of the distinct constituents render polymer-grafted nanocrystals (PGNPs) intriguing materials systems in which property characteristics can be tuned over a wide range from hard particulate to soft polymer-type. Here we demonstrate that dependent on the molecular weight and the graft density of the grafted polymer chains, three characteristic regimes of PGNPs are observed: (1) hard-sphere type colloidal crystalline with the formation of cracks driven by short-range interactions, (2) plastic mesocrystalline with the crazing behaviors by chain entanglement, or (3) disordered structure with soft-polymer type interactions. In addition to controlling the mechanical properties of PGNPs, grafted chains can have a key role in mediating their gradual transformation into more ordered microstructures from nanoparticles with energetically unfavorable property (i.e., activation barrier for crystallization induced by polydisperse nanoparticles [1, 2]).

Keywords

nanostructurenanoscalemolecular weight
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1257: Symposium O – Multifunctional Nanoparticle Systems-Coupled Behavior and Applications , 2010 , 1257-O08-05
Copyright
Copyright © Materials Research Society 2010

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