狠狠色丁香久久综合婷婷亚洲成人福利在线-欧美日韩在线观看免费-国产99久久久久久免费看-国产欧美在线一区二区三区-欧美精品一区二区三区免费观看-国内精品99亚洲免费高清

文獻(xiàn)名：Regulation of the Charge and Hydrodynamic Diameter of Silica Nanoparticles in AOT Microemulsions 

 

作者：    N. O. Shaparenko, D. I. Beketova, M. G. Demidova, A. I. Bulavchenko

A.V. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

 

摘要：Stable SiO2 organosols have been obtained by hydrolyzing tetraethyl orthosilicate in water-in-oil microemulsions of sodium bis(2-ethylhexyl) sulfosuccinate (Aerosol OT, AOT) in n-decane. Phase analysis light scattering and photon-correlation spectroscopy have been employed to study the electrophoretic mobility and hydrodynamic diameter of silica nanoparticles as depending on the concentrations of water (0–10 vol %), chloroform in n-decane–chloroform mixtures (0–40 vol %), and an oxyethylated surfactant (Tergitol NP-4, 0–0.125 M), as well as temperature (0–60°C). The electrophoretic mobility of the nanoparticles has been found to increase by three to four times upon the addition of water and chloroform. Nanoparticles with a hydrodynamic diameter of 20 nm are negatively charged in the absence of water, while the surface charge reversal takes place at water and chloroform concentrations of higher than 0.1 and 17 vol %, respectively.