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Synthesis and utilization of monodisperse superparamagnetic colloidal particles for magnetically controllable photonic crystals

Xu, X and Friedman, G and Humfeld, KD and Majetich, SA and Asher, SA (2002) Synthesis and utilization of monodisperse superparamagnetic colloidal particles for magnetically controllable photonic crystals. Chemistry of Materials, 14 (3). 1249 - 1256. ISSN 0897-4756

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Abstract

We demonstrate fabrication of novel magnetically controllable photonic crystals formed through the self-assembly of highly charged, monodisperse superparamagnetic colloidal spheres. These superparamagnetic monodisperse charged polystyrene particles containing nanoscale iron oxide nanoparticles were synthesized through emulsion polymerization. They self-assemble into crystalline colloidal arrays (CCAs) in deionized water and Bragg diffract visible light. The diffraction from these superparamagnetic CCAs can be controlled by imposition of magnetic fields, which readily alter the CCA lattice constant. We also observe magnetically induced self-assembly of these superparamagnetic particles into CCAs in media such as NaCl aqueous solutions and organic polar solvents, which normally do not permit spontaneous CCA self-assembly. We also find that magnetic fields can strain the face-centered cubic lattice of superparamagnetic CCAs polymerized within hydrogels. The lattice symmetry of this photonic crystal becomes tetragonal. The observed magnetically induced CCA self-assembly enables the development of novel photonic crystal materials and devices.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Xu, X
Friedman, G
Humfeld, KD
Majetich, SA
Asher, SAasher@pitt.eduASHER
Date: 9 April 2002
Date Type: Publication
Journal or Publication Title: Chemistry of Materials
Volume: 14
Number: 3
Page Range: 1249 - 1256
DOI or Unique Handle: 10.1021/cm010811h
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0897-4756
Date Deposited: 27 Feb 2013 18:49
Last Modified: 02 Feb 2019 16:55
URI: http://d-scholarship.pitt.edu/id/eprint/17375

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