2020 Volume 128 Issue 1 Pages 1-6
An integrated approach using anionic polymer sources and conventional spray drying technology was proposed to synthesize inorganic particles covered with single layer of fine particles. Negatively charged poly(acrylic acid) adsorbed on the two particles even though the particles had negative charge and assisted to disperse them individually in suspension. The dispersed 0.25 µm Fe3O4 was uniformly accumulated with single layer on 2.0 µm BaTiO3 particles by their condensation in shrinking sprayed droplets. The poly(acrylic acid) molecules which adsorbed on both particles had a function to bind the two particles, and the Fe3O4 fine particles were fixed on BaTiO3 particles persistently and discretely. The poly(acrylic acid)-assisted spray drying method is applicable for any combination of various functional particles.