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کلوئیدها و سطوح الف: جنبه های فیزیکوشیمیایی و مهندسی
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  • influence of ctab and sds on the properties of oil-in-water nano-emulsion with paraffin and span 20/tween 20

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1283
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     oil-in-water (o/w) nano-emulsions with paraffin as an oil phase and sorbitan monooleate (span 20)/polyoxyethylene sorbitan monooleate (tween 20) as emulsifiers were prepared using the emulsion inversion phase (eip) method at 25 ℃. the properties of the nano-emulsions were investigated in detail as a function of emulsifier content and the addition of ionic surfactants including cetyltrimethylammonium bromide (ctab) and sodium dodecyl sulfate (sds). the droplets of the nano-emulsions become smaller with the increasing concentration of tween 20/span 20 and the polydispersity of the droplets decreases. similarly, the mean droplet size also decreases with the addition of both ctab and sds. the zeta potential of the nano-emulsion droplet without sds or ctab was found to be negative. upon the addition of sds, a more negative value was obtained which leads to an increased electrostatic interactions between droplets and improves the stability of the nano-emulsions via lowering the ostwald ripening rate. upon the addition of ctab, however, a less negative zeta potential was induced which weakens the electrostatic interactions between droplets and lowers the stability of the nano-emulsions. these results indicate that electrostatic interaction is the main factor determining the stability of the nano-emulsions. interfacial rheological measurements indicated that the maximum values of dilational moduli of both tween 20/sds and tween 20/ctab mixed adsorption layers at paraffin oil/water interface are lower than that of single adsorption layer of tween 20. our results give new insights of the nano-emulsions containing mixed surfactants and may serve as guidelines for preparation of new nano-emulsion systems for practical applications.

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