Abstract
We report investigations on the swelling behavior of poly(N-isopropylacrylamide-co-acrylic acid) (pNIPAm-co-AAc) microgel thin films as a function of pH using quartz crystal impedance (QCI) analysis and surface plasmon resonance (SPR) spectroscopy. In this work, pNIPAm-co-AAc microgels are assembled into thin films using a spin-coating layer-by-layer (scLbL) assembly approach by alternatively exposing 2-mercaptoethylamine-functionalized Au QCI and SPR substrates to polyanionic pNIPAm-co-AAc microgels and polycationic poly(allylamine hydrochloride). The scLbL process is followed by QCI analysis, which displays a linear decrease in resonant frequency, i.e., increase in mass, as a function of the microgel layer number. The swelling behavior of an assembled film in response to acidic (pH ≈ 3.0) and neutral (pH ≈ 6.5) solution conditions is monitored using QCI. Exposure of a microgel thin film to acidic solution results in a dramatic decrease in resonant frequency and an increase in motional resistance. When t...
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