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- W1968320199 abstract "Poly (N-isopropylacrylamide)-co-acrylic acid (pNIPAm-co-AAc) microgel-based etalons have been shown to have visible color and unique spectral properties, which both depend on solution temperature and pH. In this investigation, pNIPAm-co-AAc microgel-based etalons were fabricated on the Au electrode of a quartz crystal microbalance (QCM), and the resonant frequency of the QCM monitored as a function of temperature, at pH 3.0. Furthermore, the resonant frequency at either pH 3.0 or 7.0 was monitored while keeping the solution temperature constant at various temperatures. In all cases, when the solution temperature was below the collapse transition for the microgels (∼32 °C), the resonant frequency at pH 3.0 was lower than at pH 7.0, which we attribute to the film transitioning from a deswollen to swollen state, respectively. It was observed that the magnitude of the resonant frequency change increased as the solution temperature approached the collapse temperature for the microgels. The overall sensitivity to pH was determined to be 1.3 × 10−8 M [H+] Hz−1 and a theoretical detection limit of 390 nM was obtained. This sensitivity will be exploited further for future biosensing applications." @default.
- W1968320199 created "2016-06-24" @default.
- W1968320199 creator A5018325534 @default.
- W1968320199 creator A5051998473 @default.
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- W1968320199 date "2012-08-01" @default.
- W1968320199 modified "2023-10-16" @default.
- W1968320199 title "Detecting solution pH changes using poly (N-isopropylacrylamide)-co-acrylic acid microgel-based etalon modified quartz crystal microbalances" @default.
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- W1968320199 doi "https://doi.org/10.1016/j.aca.2012.06.025" @default.
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