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Novel Colloidal Assembly Methods for the Preparation of Core-Shell Composite Materials

Published online by Cambridge University Press:  17 March 2011

Michael S. Fleming ,
Tarun K. Mandal  and
David R. Walt
Michael S. Fleming
Affiliation:
The Max Tishler Laboratory for Organic Chemistry, Tufts University, Department of Chemistry, 62 Talbot Avenue, Medford, MA 02155, U.S.A.
Tarun K. Mandal
Affiliation:
The Max Tishler Laboratory for Organic Chemistry, Tufts University, Department of Chemistry, 62 Talbot Avenue, Medford, MA 02155, U.S.A.
David R. Walt
Affiliation:
The Max Tishler Laboratory for Organic Chemistry, Tufts University, Department of Chemistry, 62 Talbot Avenue, Medford, MA 02155, U.S.A.
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Abstract

Colloidal assembly is a process by which particles ranging in size from nanometers to micrometers are organized into structures by mixing two or more particle types. Assembly is controlled by either specific or non-specific interactions between particles. Examples include chemical bonding, biological interactions, electrostatic interactions, capillary action and physical adsorption. The assembly process is performed such that smaller particles assemble around larger ones. In this paper, we report on colloidal assembly of polymer nanoparticles (50-200 nm diameter) onto silica particles (3-5 μm diameter) using specific chemical interactions (i.e. aminealdehyde). Annealing the assembled composites at temperatures above the glass transition (Tg) of the polymer nanospheres allows polymer to flow and uniformly coat the microsphere surfaces. Polystyrene and poly(methyl methacrylate) nanospheres were used to produce such materials. Shell composites were created by mixing both nanosphere types prior to assembly/annealing. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the materials presented herein.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 636: Symposium D – Nonlithographic and Lithographic Methods of Nanofabrication-From Ultralarge Scale , 2000 , D9.17.1
Copyright
Copyright © Materials Research Society 2001

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