Journal
COLLOID AND POLYMER SCIENCE
Volume 287, Issue 5, Pages 601-608Publisher
SPRINGER
DOI: 10.1007/s00396-009-2010-7
Keywords
Gold nanoparticle; Hydrogel; Responsive; Phase transition
Categories
Funding
- The American Chemical Society Petroleum Research Fund [PRF42899-GB10]
- National Science Foundation [CHE-0353813]
- Wellesley College
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We report the synthesis of N-isopropylacrylamide-based hydrogels containing either an anionic (acrylic acid) or cationic ([2-(acryloyloxy)ethyl]trimethylammonium chloride) co-monomer. These hydrogels were cross-linked with a cleaveable (N,N'-cystaminebisacrylamide) and/or inert (N,N'-methylenebisacrylamide) molecule in four combinations. Gold nanostructures were then synthesized within these hydrogel matrices by in situ reduction of a metal ion precursor. The resulting eight nanocomposites and their non-gold-containing (native) analogs were characterized with several analytical methods. UV-visible and infrared spectroscopy revealed differences among the samples based largely on the concentration and identity of cross-linking agent. Equilibrium swelling masses and phase transition behavior point to differences among samples on charge of the hydrogel backbone, cross-linker type, and presence or absence of gold nanostructures. A molecular level explanation for these observations is described.
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