eprintid: 17387
rev_number: 16
userid: 1419
dir: disk0/00/01/73/87
datestamp: 2013-02-27 18:42:38
lastmod: 2019-02-02 16:55:05
status_changed: 2013-02-27 18:42:38
type: article
metadata_visibility: show
item_issues_count: 0
eprint_status: archive
creators_name: Kamenjicki, M
creators_name: Lednev, IK
creators_name: Asher, SA
creators_email: 
creators_email: 
creators_email: asher@pitt.edu
creators_id: 
creators_id: 
creators_id: ASHER
title: Photoresponsive azobenzene photonic crystals
ispublished: pub
divisions: sch_as_chemistry
full_text_status: public
abstract: We demonstrate azobenzene photochemically driven diffraction switching of a photonic crystal consisting of a crystalline colloidal array (CCA) polymerized within a hydrogel matrix. A novel azobenzene derivative that has a large ground-state activation barrier between the cis and trans forms in water is used. The system is actuated by excitation with UV light (wavelength of 365 nm), which photoisomerizes the azobenzene trans state to the cis ground state. The increased dipole moment of the cis state increases the free energy of mixing, causing a hydrogel swelling, which red-shifts the embedded CCA diffraction. Excitation with visible light photoisomerizes the cis state to the trans state, which resets the diffraction. This material acts as a memory storage material. Information is recorded and erased by exciting the photonic crystal in the UV or visible spectral region. The written information is read out completely and nondestructively by the wavelength of the Bragg diffraction (in this case, in the red).
date: 2004-08-26
date_type: published
publication: Journal of Physical Chemistry B
volume: 108
number: 34
pagerange: 12637 - 12639
refereed: TRUE
issn: 1520-6106
id_number: 10.1021/jp047500p
citation:   Kamenjicki, M and Lednev, IK and Asher, SA  (2004) Photoresponsive azobenzene photonic crystals.  Journal of Physical Chemistry B, 108 (34).  12637 - 12639.  ISSN 1520-6106     
document_url: http://d-scholarship-dev.library.pitt.edu/17387/1/licence.txt