Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Relative Parameter Contributions for Encapsulating Silica-Gold Nanoshells by Poly(N-isopropylacrylamide-co-acrylic acid) Hydrogels

  • Park, Min-Yim (Department of Chemical & Bio Engineering, Kyungwon University) ;
  • Lim, Se-Ra (Department of Chemical & Bio Engineering, Kyungwon University) ;
  • Lee, Sang-Wha (Department of Chemical & Bio Engineering, Kyungwon University) ;
  • Park, Sang-Eun (Advanced Energy Materials Processing Laboratory, Korea Institute of Science and Technology)
  • Published : 2009.05.31
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Abstract

Core-shell hydrogel nanocomposite was fabricated by encapsulating a silica-gold nanoshell (SGNS) with poly(N-isopropylacrylamide-co-acrylic acid) (PNIPAM-co-AAc) copolymer. The oleylamine-functionalized SONS was used as a nanotemplate for the shell-layer growth of hydrogel copolymer. APS (ammonium persulfate) was used as a polymerization initiator to produce a hydrogel-encapsulated SGNS (H-SGNS). The amounts of NIPAM (N-isopropylacrylamide) monomers were optimized to reproduce the hydrogel-encapsulated SGNS. The shell-layer thickness was increased with the increase of polymerization time and no further increase in the shell-layer thickness was clearly observed over 16 h. H-SGNS exhibited the systematic changes of particle size corresponding to the variation of pH and temperature, which was originated from hydrogen-bonding interaction between PNIPAM amide groups and water, as well as electrostatic forces attributed by the ionization of carboxylic groups in acrylic acid.

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