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美國布魯克海文儀器公司>技術(shù)文章>SiO2 and TiO2 nanoparticles in Aerosol OT reverse microemulsions: Synthesis and characterization

技術(shù)文章

SiO2 and TiO2 nanoparticles in Aerosol OT reverse microemulsions: Synthesis and characterization

閱讀:578          發(fā)布時(shí)間:2018-10-10
 作者:M. G. Demidova, N. O. Shaparenko, T. Yu. Podlipskaya, A. I. Bulavchenko

Nikolaev Institute of Inorganic Chemistry, Siberian BranchRussian Academy of SciencesNovosibirskRussia

 

摘要:Stable SiO2 and TiO2 organosols were prepared by hydrolyzing tetraethyl orthosilicate (TEOS) in the presence of 612 M NH3 and titanium(IV) isopropylate (TTIP) in reverse microemulsions of 0.120.25 M bis(2-ethylhexyl) sulfosuccinate (Aerosol OT, AOT) in n-decane with the aqueous pseudophase content of 23 vol %, 0.0180.090 M TEOS, and 0.150.55 vol %, 0.0030.025 M TTIP. The degree of hydrolysis was monitored by IR spectroscopy (for TEOS) and spectrophotometry (for TTIP). Oxide nanoparticles were characterized by photon-correlation spectroscopy (PCS) (D h = 8100 nm) and laser electrophoresis (ζ-potential = 7.411.6 mV). The occurrence of surface potential made it possible to separate the oxides from the excess of surfactant by nonaqueous electrophoresis and to determine particle sizes (740 nm) by means of transmission electron microscopy (TEM).

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