Excitation wavelength dependence of solvation dynamics in a supramolecular assembly: PEO-PPO-PEO triblock copolymer and SDS

Article Abstract:

Femtosecond upconversion is used to study the excitation wavelength dependence of the solvation dynamics of coumarin 480 (C480) in a triblock copolymer [(PEO).sub.20]-[(PPO).sub.70]-[(PEO).sub.20] (P123)-sodium dodecyl sulfate (SDS) aggregate. The magnitude of the [[lambda].sub.ex] dependence in P123-SDS is shown to be much smaller than that of P123 micelle, thus providing better insights on the difference between the properties of the core and the corona region than static absorption and emission spectra.

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Qualitative differences in the adsorption chemistry of acidic [CO2, SO(sub x)] and amphiphilic [NO(sub x)] species on the alkaline earth oxides

Article Abstract:

Density functional theory (DFT) calculations are used for contrast structures and trends in the adsorption chemistry of the acidic adsorbates CO2, SO2, and SO3 with that of amphiphilic NO, NO2, and NO3 on the (001) surfaces of MgO through BaO are presented. The qualitative and quantitative insights provide a framework for understanding the factors that control adsorption phenomena of interest for selective NO(sub x) trapping for environmental emissions control.

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Electronic structure of Ag2Cu2O4. Evidence of oxidized silver and copper and internal charge delocalization

Article Abstract:

The analysis of the electronic structure of the isolated silver copper oxide Ag2Cu2O4 is presented along with its precursor Ag2Cu2O4 and similar binary oxides, Ag2O, AgO, CuO, and NaCuO2. The results for AgCu2O4 reveal an electronic distribution in which silver and copper share a delocalized valence scheme with both metals in formal oxidation states larger than the usual Ag(super I) and Cu(super II).

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