Abstract

Prateek Shukla¹, Tandra Nandi² and Rajinder Pal Singh³

DOI : http://dx.doi.org/10.13005/ojc/330429

Surfactant capped uniform silver nanoparticles were synthesized by the chemical reduction reaction in a microemulsion media, which is formed under high shear mixing condition. Silver nitrate solution and 2-ethyl hexanol were taken as aqueous and organic phase, sodium borohydride was used as reducing agent and Span-80 (sorbitanmonooleate) as the capping agent. Synthesized silver nanoparticles were characterized by transmission electron microscopy and dynamic light scattering technique for their size, shape and particle size distribution. The Crystalline structure of silver nanoparticles is ascertained by X- ray diffraction analysis.  Uniform silver nanoparticles of average particles diameter (15-20) nm thus prepared have beenincorporated into fumed silica matrix using polyethylene glycol as the carrier fluid to prepare electrorheological (ER) paste. Different compositions of ER paste have been prepared using the different concentration of silver nanoparticles. The prepared electrorheological paste has shown commendable response with respect to viscosity and dynamic yield stress enhancement under applied electric field.

Silver nanoparticles;electrorheology; X-ray diffraction; transmission electron microscopy; dynamic light scattering and ER paste

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