Formation mechanism of fine structure of zirconia fine particles by spray-pyrolysis

In order to clarify the formation mechanism of zilconia fine particles prod uced by spray-pyrolysis, the fine structure with particles is elucidated ba sed on structural analysis of dried particles and decomposed particles. Fro m SEM photograph observation, relatively large hollow spheres appear In par ticles produced from the concentrated solution with 1 kmol.m(-3) and those from the dilute solution with 0.1 kmol.m(-3) are solid spheres. From struct ural analysis of the dried and decomposed particles, it is indicated that t he dried particles are non-porous with irrespective of the temperature and the concentration. For the dilute solution, the decomposed particles under any temperatures have mesopores. For the concentrated solution, however, th e pore radius shifts from the micropore region to the mesopore region with increase in temperature.