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Enabling thermoreversible physically cross-linked polymerized colloidal array photonic crystals

Asher, SA and Kimble, KW and Walker, JP (2008) Enabling thermoreversible physically cross-linked polymerized colloidal array photonic crystals. Chemistry of Materials, 20 (24). 7501 - 7509. ISSN 0897-4756

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We physically cross-linked a thermoreversible poly(vinyl alcohol) (PVA) hydrogel (TG) within a crystalline colloidal array (CCA) to form an enabling photonic crystal material. The TG consists of a physically cross-linked network formed in a process reminiscent of the well-known freeze-thaw physically cross-linking process, but which avoids solvent freezing which invariably disorders the CCA. These TGCCA can be inexpensively fabricated in any large volume and shape by avoiding the previous covalently polymerized CCA constraints that required thin sheet geometries to enable penetration of the UV light used to photopolymerize the system. This TG hydrogel enables rigidificaton of CCA crystals and subsequent chemical functionalization. In addition, an additional interpenetrating hydrogel can be polymerized within the TGPCCA. The TG can then be dissolved away by simply increasing the temperature. The TGCCA photonic crystal diffraction is highly efficient and similar to previously demonstrated PCCA with covalent cross-links. These TGCCA are stable for weeks or longer at room temperature and can be utilized as photonic crystal materials. They also can be irreversibly covalently cross-linked by using gluteraldehyde. These gluteraldehyde cross-linked TGCCA can be made into chemically responsive sensor photonic crystals by functionalizing the PVA hydroxyl groups with chemical recognition agents. We demonstrate low and high pH sensing by functionalizing with carboxylates and phenol derivatives, respectively. © 2008 American Chemical Society.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Asher, SAasher@pitt.eduASHER
Kimble, KW
Walker, JP
Date: 23 December 2008
Date Type: Publication
Journal or Publication Title: Chemistry of Materials
Volume: 20
Number: 24
Page Range: 7501 - 7509
DOI or Unique Handle: 10.1021/cm801519x
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0897-4756
PubMed Central ID: PMC2727687
PubMed ID: 19966904
Date Deposited: 08 Feb 2013 20:49
Last Modified: 02 Feb 2019 16:55


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