eprintid: 17340
rev_number: 26
userid: 1419
dir: disk0/00/01/73/40
datestamp: 2013-02-21 22:35:10
lastmod: 2021-06-12 23:55:38
status_changed: 2013-02-21 22:35:10
type: article
metadata_visibility: show
item_issues_count: 0
eprint_status: archive
creators_name: Ward Muscatello, MM
creators_name: Asher, SA
creators_email: 
creators_email: asher@pitt.edu
creators_id: 
creators_id: ASHER
title: Poly(vinyl alcohol) rehydratable photonic crystal sensor materials
ispublished: pub
divisions: sch_as_chemistry
full_text_status: public
abstract: We developed a new photonic crystal hydrogel material based on the biocompatible polymer poly (vinyl alcohol) (PVA), which can be reversibly dehydrated and rehydrated, without the use of additional fillers, while retaining the diffraction and swelling properties of polymerized crystalline colloidal arrays (PCCA). This chemically modified PVA hydrogel photonic crystal efficiently diffracts light from the embedded crystalline colloidal array. This diffraction optically reports on volume changes occurring in the hydrogel by shifts in the wavelength of the diffracted light. We fabricated a pH sensor, which demonstrates a 350 nm wavelength shift between pH values of 3.3 and 8.5. We have also fabricated a Pb+2 sensor, in which pendant crown ether groups bind lead ions. Immobilization of the ions within the hydrogel increases the osmotic pressure due to the formation of a Donnan potential, swelling the hydrogel and shifting the observed diffraction in proportion to the concentration of bound ions. The sensing responses of rehydrated PVA pH and Pb+2 sensors were similar to that before drying. This reversibility of rehydration enables storage of these hydrogel photonic crystal sensors in the dry state, which makes them much more useful for commercial applications. © 2008 WILEY-VCH Verlag GmbH & Co. KGaA.
date: 2008-04-25
date_type: published
publication: Advanced Functional Materials
volume: 18
number: 8
pagerange: 1186 - 1193
refereed: TRUE
issn: 1616-301X
id_number: 10.1002/adfm.200701210
pmcid: PMC3111221
pmid: 21666875
citation:   Ward Muscatello, MM and Asher, SA  (2008) Poly(vinyl alcohol) rehydratable photonic crystal sensor materials.  Advanced Functional Materials, 18 (8).  1186 - 1193.  ISSN 1616-301X     
document_url: http://d-scholarship-dev.library.pitt.edu/17340/1/licence.txt