Effect of Mixing on the Formation of Complexes of Hyperbranched Cationic Polyelectrolytes and Anionic Surfactants

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• 作者：Am&aacute ; lia Mezei ; Ró ; bert Mé ; sz&aacute ; ros ; Imre Varga ; Tibor Gil&aacute ; nyi
• 刊名：Langmuir
• 出版年：2007
• 出版时间：April 10, 2007
• 年：2007
• 卷：23
• 期：8
• 页码：4237 - 4247
• 全文大小：808K
• 年卷期：v.23,no.8(April 10, 2007)
• ISSN：1520-5827

文摘

The effect of different mixing protocols on the charged nature and size distribution of the aqueous complexes ofhyperbranched poly(ethylene imine) (PEI) and sodium dodecyl sulfate (SDS) was investigated by electrophoreticmobility and dynamic light scattering measurements at different pH values, polyelectrolyte concentrations, and ionicstrengths. It was found that at large excess of the surfactant a colloidal dispersion of individual PEI/SDS nanoparticlesforms via an extremely rapid mixing of the components by means of a stop-flow apparatus. However, the applicationof a less efficient mixing method under the same experimental conditions might result in large clusters of the individualPEI/SDS particles as well as in a more extended precipitation regime compared with the results of stop-flow mixingprotocol. The study revealed that the larger the charge density and concentration of the PEI, the more pronouncedthe effect of mixing becomes. It can be concluded that an efficient way to avoid precipitation in the solutions ofoppositely charged polyelectrolytes and surfactants might be provided by extending the range of kinetically stablecolloidal dispersion of polyelectrolyte/surfactant nanoparticles via the application of appropriate mixing protocols.