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Nanobrook Omni測量應用案例-94

來源:美國布魯克海文儀器公司   2019年04月16日 09:08  
 文獻名:Synthesis, characterization, and electrophoretic concentration of titanium dioxide nanoparticles in AOT microemulsions  

 

作者: Alexander I. Bulavchenko, Nikita O. Shaparenko, Marina G. Demidova

Nikolaev Institute of Inorganic Chemistry, Russian Academy of Sciences, Siberian BranchNovosibirsk, Russia

 

摘要:Stable organosols of TiO2 nanoparticles were prepared by hydrolysis of titanium tetraisopropoxide (TTIP) in microemulsions of sodium bis(2ethylhexyl)sulfoxynate (АОТ) in ndecane with increasing the content of aqueous pseudophase from 0.15 to 0.85 vol.%. As the water content increased, the hydrodynamic diameter of nanoparticles grew from 10 to 225 nm, and the  ζ‐potential, from 6 to 18 mV (the surface of TiO2 nanoparticles was recharged when the water content was 0.45 vol.%). Nonaqueous electrophoresis in a capacitortype cell made it possible to concentrate nanoparticles with a diameter of 60 to 225 nm (concentration factor was 10), separate 20 nm and 225 nm particles, and decrease the content of АОТ in organosol by an order of magnitude. Preparation of a concentrate of nanoparticles with a low content (0.015 M) of AOT included the following stages: (i) electrophoresis after synthesis; (ii) sampling of the concentrate and its twentyfold dilution with pure ndecane; and (iii) repeated electrophoresis. In situ laser and spectrophotometric scanning of the interelectrode space showed the formation of a sharp boundary between the raffinate and the layer of moving nanoparticles during electrophoresis. 

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