eprintid: 17389
rev_number: 16
userid: 1419
dir: disk0/00/01/73/89
datestamp: 2013-02-27 18:50:52
lastmod: 2019-02-02 16:55:05
status_changed: 2013-02-27 18:50:51
type: article
metadata_visibility: show
item_issues_count: 0
eprint_status: archive
creators_name: Kamenjicki, M
creators_name: Asher, SA
creators_email: 
creators_email: asher@pitt.edu
creators_id: 
creators_id: ASHER
title: Photochemically controlled cross-linking in polymerized crystalline colloidal array photonic crystals
ispublished: pub
divisions: sch_as_chemistry
full_text_status: public
abstract: 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.
date: 2004-11-02
date_type: published
publication: Macromolecules
volume: 37
number: 22
pagerange: 8293 - 8296
refereed: TRUE
issn: 0024-9297
id_number: 10.1021/ma049678f
citation:   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     
document_url: http://d-scholarship-dev.library.pitt.edu/17389/1/licence.txt