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Ferhan, Abdul Rahim,Š,pač,ková,, Barbora,Jackman, Joshua A.,Ma, Gamaliel J.,Sut, Tun Naw,Homola, Jiř,í,Cho, Nam-Joon American Chemical Society 2018 ANALYTICAL CHEMISTRY - Vol.90 No.21
<P>Unraveling the details of how supported lipid bilayers (SLBs) are coupled to oxide surfaces is experimentally challenging, and there is an outstanding need to develop highly surface-sensitive measurement strategies to determine SLB separation distances. Indeed, subtle variations in separation distance can be associated with significant differences in bilayer-substrate interaction energy. Herein, we report a nanoplasmonic ruler strategy to measure the absolute separation distance between SLBs and oxide surfaces. A localized surface plasmon resonance (LSPR) sensor was employed to track SLB formation onto titania- and silica-coated gold nanodisk arrays. To interpret measurement data, an analytical model relating the LSPR measurement response to bilayer-substrate separation distance was developed based on finite-difference time-domain (FDTD) simulations and theoretical calculations. The results indicate that there is a larger separation distance between SLBs and titania surfaces than silica surfaces, and the trend was consistent across three tested lipid compositions. We discuss these findings within the context of the interfacial forces underpinning bilayer-substrate interactions, and the nanoplasmonic ruler strategy provides the first direct experimental evidence comparing SLB separation distances on titania and silica surfaces.</P> [FIG OMISSION]</BR>
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Activation of Periodate by Freezing for the Degradation of Aqueous Organic Pollutants
Choi, Yejin,Yoon, Ho-Il,Lee, Changha,Vetrá,ková,, L’ubica,Heger, Dominik,Kim, Kitae,Kim, Jungwon American Chemical Society 2018 Environmental science & technology Vol.52 No.9
<P>A new strategy (i.e., freezing) for the activation of IO<SUB>4</SUB><SUP>-</SUP> for the degradation of aqueous organic pollutants was developed and investigated. Although the degradation of furfuryl alcohol (FFA) by IO<SUB>4</SUB><SUP>-</SUP> was negligible in water at 25 °C, it proceeded rapidly during freezing at −20 °C. The rapid degradation of FFA during freezing should be ascribed to the freeze concentration effect that provides a favorable site (i.e., liquid brine) for the proton-coupled degradation process by concentrating IO<SUB>4</SUB><SUP>-</SUP>, FFA, and protons. The maximum absorption wavelength of cresol red (CR) was changed from 434 nm (monoprotonated CR) to 518 nm (diprotonated CR) after freezing, which confirms that the pH of the aqueous IO<SUB>4</SUB><SUP>-</SUP> solution decreases by freezing. The degradation experiments with varying experimental parameters demonstrate that the degradation rate increases with increasing IO<SUB>4</SUB><SUP>-</SUP> concentration and decreasing pH and freezing temperature. The application of the IO<SUB>4</SUB><SUP>-</SUP>/freezing system is not restricted to FFA. The degradation of four other organic pollutants (i.e., tryptophan, phenol, 4-chlorophenol, and bisphenol A) by IO<SUB>4</SUB><SUP>-</SUP>, which was negligible in water, proceeded during freezing. In addition, freezing significantly enhanced the IO<SUB>4</SUB><SUP>-</SUP>-mediated degradation of cimetidine. The outdoor experiments performed on a cold winter night show that the IO<SUB>4</SUB><SUP>-</SUP>/freezing system for water treatment can be operated without external electrical energy.</P> [FIG OMISSION]</BR>
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