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Photoswitchable spirobenzopyran-based photochemically controlled photonic crystals

Maurer, MK and Lednev, IK and Asher, SA (2005) Photoswitchable spirobenzopyran-based photochemically controlled photonic crystals. Advanced Functional Materials, 15 (9). 1401 - 1406. ISSN 1616-301X

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We have developed a photochemically controlled photonic-crystal material by covalently attaching spiropyran derivatives to polymerized crystalline colloidal arrays (PCCAs). These PCCAs consist of colloidal particles that self-assemble into crystalline colloidal arrays (CCAs), which are embedded in crosslinked hydrogels. Photoresponsive PCCAs were made two ways: 1) by functionalizing the hydrogel network with spiropyran derivatives, and 2) by functionalizing the colloidal particles with spiropyran derivatives. These materials can diffract light in the UV, visible, or near-IR spectral regions. The diffraction of the PCCAs is red-shifted by exciting the spiropyran with UV light. Alternatively, the diffraction is blue-shifted by exciting the spiropyran with visible irradiation. Thus, this material acts as a memory storage material where information is recorded by illuminating the PCCA and information is read out by measuring the photonic-crystal diffraction wavelength. UV excitation forms the open spiropyran form while visible excitation forms the closed spiropyran form. The diffraction shifts result from changes in the free energy of mixing of the PCCA system as the spiropyran is photoexcited to its different stable forms. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Maurer, MK
Lednev, IK
Asher, SAasher@pitt.eduASHER
Date: 1 September 2005
Date Type: Publication
Journal or Publication Title: Advanced Functional Materials
Volume: 15
Number: 9
Page Range: 1401 - 1406
DOI or Unique Handle: 10.1002/adfm.200400070
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 1616-301X
Date Deposited: 28 Mar 2013 16:22
Last Modified: 02 Feb 2019 16:55


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