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Magnetic nanocolloids with synthesized super paramagnetic Fe3O4 nanoparticles(SPION) (5 to 15 nm) dispersed in insitu developed Polyethylene Glycol (PEG400) and nano silica complex have been synthesized. The PEG nano Silica complexphysically encapsulates the SPIONs, ensuring no phase separation under highmagnetic fields (1.2 T). Exhaustive magnetorheological investigations have beenperformed to comprehend the structural behavior and response of theferrocolloids. Remarkable stability and reversibility have been observed undermagnetic field for concentrated systems. The results exhibit the impact ofparticle concentration, size and encapsulation efficiency on parameters such asshear viscosity, yield stress, viscoelastic moduli, magnetoviscous hysteresisetc. Analytical models to reveal the system mechanism and mathematicallypredict the magnetoviscosity and magneto yield stress has been theorized. Themechanistic approach based on near field magnetostatics and Neel Brownianinteractivities can predict the colloidal properties under the effect of fieldaccurately. The colloid exhibits amplified storage and loss moduli alongsidehighly augmented linear viscoelastic region under magnetic stimuli. Thetransition of the colloidal state from fluidic phase to soft condensed phaseand its viscoelastic stimuli under the influence of magnetic field has beenexplained based on the mathematical analysis. The remarkable stability,magnetic properties and accurate physical models reveal good promise for thecolloids in transient situations viz. magneto MEMS/ NEMS devices, antiseismicdamping, biomedical invasive treatments etc.

Near field magnetostatics and Neel Brownian interactions mediated magnetorheological characteristics of highly stable nano ferrocolloids