Synthesis and field-responsive properties of SrTiO_3 nanoparticle/polymer hybrid

摘要

Nanocrystalline strontium titanate (SrTiO_3) particle/polymer hybrid was synthesized from metal-organics and 2-(methacryloyloxy)ethyl maleate (MMEM). SrTiO_3 precursor was prepared from strontium isopropoxide and titanium isopropoxide in 2-methoxyethanol. Nanocrystalline SrTiO_3 particle/poly-MMEM hybrid was formed by hydrolysis followed by reaction with MMEM. The crystallinity of SrTiO_3 particles depended on the amount of water for hydrolysis. The nanocrystalline particles were identified to be strontium titanate by x-ray diffraction. Fourier transform infrared spectroscopy and x-ray photoelectron spectroscopy showed the presence of the chemical bond between SrTiO_3 particles and the organic matrix. The fluid consisting of SrTiO_3 particle/poly-MMEM and silicone oil revealed a yield stress dependent on various conditions, such as hydrolysis conditions and applied field. The hybridization was found to have a pronounced effect on the electrorheological properties of the nanoparticle/polymer-based system.