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Photonic crystal chemical sensors: pH and ionic strength

Lee, K and Asher, SA (2000) Photonic crystal chemical sensors: pH and ionic strength. Journal of the American Chemical Society, 122 (39). 9534 - 9537. ISSN 0002-7863

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Diffraction from a photonic crystal material composed of a hydrolyzed polymerized crystalline colloidal array (PCCA) can be used to sense pH and ionic strength. The PCCA is a polyacrylamide hydrogel which embeds a polystyrene crystalline colloidal array (CCA). The diffracted wavelength of the PCCA changes as the PCCA volume changes due to the alterations in the CCA lattice constant. We examine the pH and ionic strength dependence of the hydrolyzed PCCA volume by monitoring the Bragg diffracted wavelength. We also develop a zero free parameter quantitative model to describe the pH and ionic strength dependence of the hydrogel volume.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Lee, K
Asher, SAasher@pitt.eduASHER
Date: 4 October 2000
Date Type: Publication
Journal or Publication Title: Journal of the American Chemical Society
Volume: 122
Number: 39
Page Range: 9534 - 9537
DOI or Unique Handle: 10.1021/ja002017n
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0002-7863
Date Deposited: 20 Mar 2013 16:41
Last Modified: 02 Feb 2019 16:55


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