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Charge stabilized crystalline colloidal arrays as templates for fabrication of non-close-packed inverted photonic crystals

Bohn, JJ and Ben-Moshe, M and Tikhonov, A and Qu, D and Lamont, DN and Asher, SA (2010) Charge stabilized crystalline colloidal arrays as templates for fabrication of non-close-packed inverted photonic crystals. Journal of Colloid and Interface Science, 344 (2). 298 - 307. ISSN 0021-9797

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We developed a straightforward method to form non-close-packed highly ordered fcc direct and inverse opal silica photonic crystals. We utilize an electrostatically self assembled crystalline colloidal array (CCA) template formed by monodisperse, highly charged polystyrene particles. We then polymerize a hydrogel around the CCA (PCCA) and condense silica to form a highly ordered silica impregnated (siPCCA) photonic crystal. Heating at 450 °C removes the organic polymer leaving a silica inverse opal structure. By altering the colloidal particle concentration we independently control the particle spacing and the wall thickness of the inverse opal photonic crystals. This allows us to control the optical dielectric constant modulation in order to optimize the diffraction; the dielectric constant modulation is controlled independently of the photonic crystal periodicity. These fcc photonic crystals are better ordered than typical close-packed photonic crystals because their self assembly utilizes soft electrostatic repulsive potentials. We show that colloidal particle size and charge polydispersity has modest impact on ordering, in contrast to that for close-packed crystals. © 2010 Elsevier Inc. All rights reserved.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Bohn, JJ
Ben-Moshe, M
Tikhonov, A
Qu, D
Lamont, DN
Asher, SAasher@pitt.eduASHER
Date: 15 April 2010
Date Type: Publication
Journal or Publication Title: Journal of Colloid and Interface Science
Volume: 344
Number: 2
Page Range: 298 - 307
DOI or Unique Handle: 10.1016/j.jcis.2010.01.021
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0021-9797
MeSH Headings: Colloids--chemistry; Crystallization; Particle Size; Polystyrenes--chemistry; Refractometry--methods; Silicon Dioxide--chemistry; Surface Properties
Other ID: NLM NIHMS181368, NLM PMC2882866
PubMed Central ID: PMC2882866
PubMed ID: 20163800
Date Deposited: 08 Feb 2013 21:01
Last Modified: 02 Feb 2019 16:55


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