Abstract
Uniform colloidal spheres of mixed aluminum-titanium (hydrous) oxides in the tenth micron diameter range were obtained by the hydrolysis of mixed aluminum sec.-butoxide-titanium ethoxide aerosol droplets. The latter were prepared in a flow system using two condensation type generators operated in series designed to promote complete mixing of the vapors. The liquid aerosols were reacted by the introduction of water vapor into the aerosol stream. The particle composition could be reproducibly controlled by varying the operating parameters (temperature, flow rate). The mixed (hydrous) oxide particles show an enhanced surface concentration of titanium over the bulk value and do not develop microporosity on heating as do pure titanium or aluminum (hydrous) oxide particles prepared in an analogous way.
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