title: Cation identity dependence of crown ether photonic crystal Pb2+ sensing.
abstract: We quantitatively modeled the volume phase transition of a hydrogel containing a crystalline colloidal array with a crown ether ligand which binds Pb2+. The hydrogel volume response and the wavelength diffracted depend on the Pb2+ concentration and on both the ionic strength and the valence of the nonbinding ionic species. We successfully modeled the response of this hydrogel Pb2+ sensor to ionic strength and the cation valence of the added salts.
authors.affiliation: Department of Chemistry, Chevron Science Center, University of Pittsburgh, Pittsburgh, PA 15260, USA.
authors.forename: Fangyong
authors.initials: F
authors.lastname: Yan
authors.forename: Sanford
authors.initials: S
authors.lastname: Asher
mesh_terms: D002413:Cations, Divalent / Q000737:chemistry*; D002867:Chromones; D043844:Crown Ethers / Q000737:chemistry*; D003460:Crystallization; D007854:Lead / Q000737:chemistry*; D009994:Osmolar Concentration; D010777:Photochemistry; D012996:Solutions
chemical_list: D002413:Cations, Divalent; D002867:Chromones; D043844:Crown Ethers; D012996:Solutions; C075943:6-propylchromone-2-carboxylic acid; D007854:Lead