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131.
Ronen Bar-Ziv 《Journal of Coordination Chemistry》2018,71(11-13):1791-1798
AbstractStored electrons on Au and Ag nanoparticles (NPs) have been found to catalyze various reduction processes initiated by ionizing irradiation or light illumination in which the NPs act as “nano-electrodes”. In the present study, we explored the effect of charging colloidal gold and silver NPs on their reaction with methyl radicals, ·CH3. The results show that charging the colloidal metal NPs by excess of electrons, (NP)n?, affected their reaction mechanism with methyl radicals and resulted in different product composition in comparison to the analogous reactions with uncharged particles. These results should be considered in photo(electro)catalytic processes when alkyl radicals are formed near the catalyst surface. 相似文献
132.
Petr Vinš Martina Vermachová Pavel Drašar Melisa del Barrio Carmen Jarne Vicente L. Cebolla Abel de Cózar Ronen Zangi Fernando P. Cossío 《Tetrahedron》2013
Different generations of dendrimers incorporating one fluorescent core of apigenin and three Fréchet benzylic dendrons have been prepared. The chief geometric features of these dendrimers have been obtained by Molecular Dynamics simulations. These computational data suggest that the asphericities of dendrimers belonging to the third and fourth generations are considerably larger than those associated with lower radii of gyration. Fluorescence spectra of high generation dendrimers evolve along time and quantum yields show an appreciable lowering for the fourth generation dendrimer. All these data suggest aggregation phenomena and lower quantum yields for nonspheric dendrimers in solution. 相似文献
133.
Papp SB Pino JM Wild RJ Ronen S Wieman CE Jin DS Cornell EA 《Physical review letters》2008,101(13):135301
We report on measurements of the excitation spectrum of a strongly interacting Bose-Einstein condensate. A magnetic-field Feshbach resonance is used to tune atom-atom interactions in the condensate and to reach a regime where quantum depletion and beyond mean-field corrections to the condensate chemical potential are significant. We use two-photon Bragg spectroscopy to probe the condensate excitation spectrum; our results demonstrate the onset of beyond mean-field effects in a gaseous Bose-Einstein condensate. 相似文献