The controllable synthesis of nanoporous SrTiO_3 by an ultrasound irradiation approach

摘要

In this paper, nanoporous strontium titanate (SrTiO_3) with controllable morphologies was prepared by a simple and rapid ultrasound irradiation method. SrTiO_3 particles were synthesized by the hydrolysis of strontium alkoxide in an alcohol/water solution and the morphology was controlled by adjusting the reaction pH value. A possible formation mechanism for the nanoporous SrTiO_3 is proposed and the relevant influence of parameters is discussed. The chemical composition, porosity, microstructure and surface morphology of products were characterized by x-ray diffraction (XRD), the nitrogen adsorption-desorption method, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Nanoporous SrTiO_3 can be used as the precursor for an electrorheological fluid and experimental results indicated that the as-prepared SrTiO_3 electrorheological fluid (ERF) exhibited high shear stress and showed shear thinning behavior.