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Fabrication of silica shell photonic crystals through flexible core

Wang, L and Asher, SA (2009) Fabrication of silica shell photonic crystals through flexible core. Chemistry of Materials, 21 (19). 4608 - 4613. ISSN 0897-4756

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We attached very small silica particles onto flexible monodisperse poly(N-isopropylacrylamide, PNIPAm) core particles synthesized by dispersion polymerization. These silica particles were attached to the partially swollen PNIPAm particles by the hydrolysis and condensation of tetraethoxysilane at 24 C. The resulting silica particle-functionalized PNIPAm core particles show reversible swelling and shrinking as the temperature is cycled. These particles form close-packedarray photonic crystals (PCs) as the solvent evaporates; the cores shrink to form a silica shell around the pure PNIPAm dry core particles as they close pack. The PNIPAm cores were removed by calcination, leaving a PC composed of essentially pure continuous silica shells. These silica shell PCs Bragg diffract UV light at 310 nm. The close packed particle interstices are continuous and are easily filled by water. In contrast, the silica shells are impervious to water because the process of making them results in a continuous shell of silica without holes.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Wang, L
Asher, SAasher@pitt.eduASHER
Date: 13 October 2009
Date Type: Publication
Journal or Publication Title: Chemistry of Materials
Volume: 21
Number: 19
Page Range: 4608 - 4613
DOI or Unique Handle: 10.1021/cm901666b
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0897-4756
PubMed Central ID: PMC2760855
PubMed ID: 20160972
Date Deposited: 08 Feb 2013 20:48
Last Modified: 01 Mar 2019 14:55


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