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  • colloidal dispersibility of fatty acid-capped iron nanoparticles and its effect on static and dynamic magnetorheological response

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1006
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    • شماره تماس دبیرخانه رویداد: -
     herein we report colloidal dispersibility of concentrated suspensions containing fatty acid-capped iron nanoparticles and its influence on the static and dynamic magnetorheological (mr) response. the amount of fatty acid absorbed on the surface controls the non-field dispersion state as well as weakly and strongly flocculated structure of the nanoparticles. both yield stress at = 0.5 t of an applied magnetic field is ca. 14–16 kpa because the flocculated structure has a negligible effect on the field-dependence yield stress, the non-field dispersion state mainly determines the turn-up ratio; the ratio of the yield stress at b = 0.5 t to shear stress (at 1 s−1) at b = 0. the dynamic measurements indicate that the two dispersion states are different in the field-induced aggregation structures. a viscoelastic linear region appears for a weakly flocculated suspension, and does not for a strongly flocculated suspension. additionally, the colloidal stability for the two dispersion states is discussed in terms of pair potential energy.

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