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Large-Scale Morphology of Dispersed Layered Silicates

Published online by Cambridge University Press:  01 February 2011

Dale W. Schaefer ,
Ryan S. Justice ,
Hilmar Koerner ,
Richard Vaia ,
Chungui Zhao ,
Mingshu Yang  and
Jim Vale
Dale W. Schaefer
Affiliation:
Chemical and Materials Engineering, University of Cincinnati, Cincinnati, OH, 45221–0012 USA. Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
Ryan S. Justice
Affiliation:
Chemical and Materials Engineering, University of Cincinnati, Cincinnati, OH, 45221–0012 USA.
Hilmar Koerner
Affiliation:
University of Dayton Research Institute, Dayton, Ohio, USA
Richard Vaia
Affiliation:
Air Force Research Laboratory, WPAFB, OH, USA.
Chungui Zhao
Affiliation:
Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
Mingshu Yang
Affiliation:
Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
Jim Vale
Affiliation:
Givaudan Flavors Corporation, Cincinnati, OH 45216, USA
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Abstract

Ultra small angle x-ray scattering is used to probe the morphology of highly dispersed montmorillonite (MMT) in water and polyamide-66. In water the scattered intensity, I(q) shows a q-2 dependence for q > 0.01 Å-1, where q is the magnitude of the scattering vector. This is as expected for a two dimensional sheet-like object. On larger scales (smaller q) mass-fractal character is evident up to the radius-of-gyration of the individual scattering entities. The scattering profile is interpreted using a semi-flexible sheet model in which flat, disk-like entities of radius = 80 Å (an areal persistence length) are fractally distributed on large scales with a mass fractal dimension of 2.65. These size scales correspond to a scattering entity comprised of one or a few crumpled sheets. No evidence of inter-particle correlations is found at concentrations below the gel point. In polyamide-66 loaded with organically modified MMT long-range fractal behavior is also observed but with larger fractal dimension.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 840: Symposium Q – Neutron and X-Ray Scattering as Probes of Multiscale Phenomena , 2004 , Q3.3
Copyright
Copyright © Materials Research Society 2005

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