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  • magnetorheological behavior of pickering emulsions stabilized by surface-modified fe3o4 nanoparticles

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1123
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     silane-modified fe3o4 nanoparticles can stabilize emulsions of both polar and non-polar oils, and the rheological behavior of these emulsions has been investigated as a function of oil volume fraction (ϕo), oil polarity and magnetic field intensity (ψ). all the emulsions show a similar elastic response with a modulus plateau at low frequency and a small phase angle (<15°) in dynamic oscillatory shear, and shear-thinning behavior in steady shear measurements. this is independent of ϕo, oil polarity and ψ. the dynamic modulus (g′) and complex viscosity (η*) increase with an increase in ϕo and oil polarity, due to enhanced droplet packing and flocculation and particle aggregation on droplet surfaces. the presence of a magnetic field promotes particle attractions and associations and enhances the strength of the three-dimensional particle and droplet networks, thus remarkably increasing g′ and η* and raising the yield stress. the increase in modulus, viscosity and yield stress are beneficial for the elevation of the stability of these functional emulsions.

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