The products were characterized by XRD, FESEM and TEM. It was found that the mesoporous hollow spheres were of the sizes of 200-500 nm and the shell thickness of about 50-100 nm with disordered wormhole framework, the mesoporous solid spheres were of the sizes of 200 -300nm.
In this paper, the poly-(styrene-acrylic acid) (PSA) cationic latex loaded with quaternary ammonium salt on its surface was prepared using P(C_(9)-DMC) as a emulsifier. With PSA as a template, ZrO_(2) hollow spheres composed of tiny crystalloid which was 17 nm in size were successfully prepared by coating directly on PSA.
Recent progress in the preparation of hollow spheres of various materials (inorganic material, metal,polymer material and inorganic-organic composite material) has been summarized. The widely used hard template and soft template routes for the preparation of hollow spheres are described and the mechanism and the characteristic of these routes reviewed.
The investigations of the core-shell formatting process and the effect of experimental conditions on pH value changes indicated that the varing rate of pH value was the determining factor for a successful coating. The optimum varing rate of pH value for core-shell microspheres formation was obtained and TiO2 hollow spheres were prepared in batches under the conditions of 230g/L PSA-A latex and 1mol/L Ti(SO4)2.