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Modeling of stimulated hydrogel volume changes in photonic crystal Pb <sup>2+</sup> sensing materials

Goponenko, AV and Asher, SA (2005) Modeling of stimulated hydrogel volume changes in photonic crystal Pb <sup>2+</sup> sensing materials. Journal of the American Chemical Society, 127 (30). 10753 - 10759. ISSN 0002-7863

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We modeled the stimulated hydrogel volume transitions of a material which binds Pb2+ and is used as a photonic crystal chemical sensing material. This material consists of a polymerized crystalline colloidal array (PCCA) hydrogel which contains a crown ether molecular recognition group. The PCCA is a polyacrylamide hydrogel which embeds a crystalline colloidal array (CCA) of monodisperse polystyrene spheres of ∼100 nm. The array spacing is set to diffract light in the visible spectral region. Changes in the hydrogel volume induced by Pb2+ binding alter the array spacing and shift the diffracted wavelength. This system allows us to sensitively follow the hydrogel swelling behavior which results from the immobilization of the Pb2+ by the crown ether chelating groups. Binding of the Pb2+ immobilizes its counterions. This results in a Donnan potential, which results in an osmotic pressure which swells the hydrogel. We continue here our development of a predictive model for hydrogel swelling based on Flory's theory of gel swelling. We are qualitatively able to model the PCCA swelling but cannot correctly model the large responsivity observed at the lowest Pb2+ concentrations which give rise to the experimentally observed low detection limits for Pb 2+. These PCCA materials enable stimulated hydrogel volume transitions to be studied. © 2005 American Chemical Society.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Goponenko, AV
Asher, SAasher@pitt.eduASHER
Date: 3 August 2005
Date Type: Publication
Journal or Publication Title: Journal of the American Chemical Society
Volume: 127
Number: 30
Page Range: 10753 - 10759
DOI or Unique Handle: 10.1021/ja051456p
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0002-7863
MeSH Headings: Cations, Divalent; Computer Simulation; Hydrogels--chemistry; Lead--analysis; Models, Chemical; Osmolar Concentration; Osmotic Pressure; Polymers--chemistry; Solutions; Thermodynamics
PubMed ID: 16045365
Date Deposited: 08 Feb 2013 21:14
Last Modified: 22 Jun 2021 13:55


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