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- W2617366234 abstract "Abstract Spherical silica particles with bifunctional ( Si(CH 2 ) 3 NH 2 / SiC 6 H 5 ) surface layers were synthesized by the Stober method using ternary alkoxysilanes systems. The influence of the synthesis conditions, such as temperature and stirring time on the process of nanoparticles formation was studied. The presence of introduced functional groups was confirmed by FTIR. The composition of the surface layers examined by elemental analysis and acid-base titration was shown to be independent from the synthesis temperature. However, the size of the obtained particles depends on the synthesis temperature and, according to photon cross-correlation spectroscopy, can be varied from 50 to 846 nm. The variation of electric charges of N-functional groups was disclosed in obtained nanospheres and attributed to different surface location of these groups and their surrounding with other groups. The sorption of Cu(II) ions by functionalized silicas depends on the concentration of amino groups, which correlates with the isoelectric point values (determined to vary from 8.26 to 9.21). Bifunctional nanoparticles adsorb 99.0 mg/g of methylene blue, compared with 48.0 mg/g by silica sample with only amino groups. The nanospheres, both with and without adsorbed Cu 2+ , demonstrate reasonable antibacterial activity against S. aureus ATCC 25923, depending on particle concentration in water suspension." @default.
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- W2617366234 date "2017-10-01" @default.
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- W2617366234 title "Bifunctional silica nanospheres with 3-aminopropyl and phenyl groups. Synthesis approach and prospects of their applications" @default.
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- W2617366234 doi "https://doi.org/10.1016/j.apsusc.2017.05.150" @default.
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