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کلوئیدها و سطوح الف: جنبه های فیزیکوشیمیایی و مهندسی
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  • the role of emulsifier in stabilization of emulsions containing colloidal alumina particles

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 932
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     this paper focuses on the study on rheological behaviour of emulsions, stabilized by both differently modified dispersible colloidal boehmite alumina nanoparticles and a non-ionic emulsifier. hysteresis loop measurements and dynamic rheological measurements were carried out in linear and non-linear regimes on two different emulsion systems – water-in-oil (w/o) and oil-in-water (o/w) emulsions. emulsion stabilized by a combination of moderately hydrophobic particles and a non-ionic emulsifier is an o/w emulsion. the addition of emulsifier improved the stability, however, did not show a significant influence on the emulsion flow behaviour. the emulsion, stabilized by both – nanoparticles and emulsifier – showed a complicated behaviour, i.e. sometimes it exhibited thixotropy or antithixotropy and sometimes both of them. emulsion stabilized by rather hydrophobic particles and a non-polar emulsifier is a w/o emulsion. the emulsion is very homogenous and exhibited very weak thixotropy. dynamic measurements showed that g’ was almost equal to g” and both parameters were frequency-dependent, indicating a viscous liquid-like system with little network structure if any. with addition of emulsifier, the rather elastic solid-like emulsion structure may be changed into the viscous liquid-like structure. in order to get a better understanding of relationships between rheological behaviour and microstructure, differential scanning calorimetry (dsc) results and optical microscopic images of the emulsions studied were discussed.

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