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Photochemically controlled cross-linking in polymerized crystalline colloidal array photonic crystals

Kamenjicki, M and Asher, SA (2004) Photochemically controlled cross-linking in polymerized crystalline colloidal array photonic crystals. Macromolecules, 37 (22). 8293 - 8296. ISSN 0024-9297

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We developed photochemically controlled photonic crystals which may be useful in novel recordable and erasable memories and/or display devices. Information is recorded and erased by exciting the photonic crystal with ∼360 nm UV light or ∼480 nm visible light. The information recorded is read out by measuring the photonic crystal diffraction wavelength. The active element of the device is an azobenzene cross-linked hydrogel which contains an embedded crystalline colloidal array. UV excitation forms cis-azobenzene cross-links while visible excitation forms trans-azobenzene cross-links. The less favorable free energy of mixing of cis-azobenzene cross-linked species causes the hydrogel to shrink and blue-shift the photonic crystal diffraction. This is completely the opposite behavior as observed from pendant azobenzene groups we reported previously. We also observe fast nano-, micro-, and millisecond transient dynamics associated with fast heating lattice constant changes, refractive index changes, and thermal relaxations. © 2004 American Chemical Society.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Kamenjicki, M
Asher, SAasher@pitt.eduASHER
Date: 2 November 2004
Date Type: Publication
Journal or Publication Title: Macromolecules
Volume: 37
Number: 22
Page Range: 8293 - 8296
DOI or Unique Handle: 10.1021/ma049678f
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0024-9297
Date Deposited: 27 Feb 2013 18:50
Last Modified: 02 Feb 2019 16:55


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