Preparation of uniform spherical titania particles coated with polyurea by the aerosol technique

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Abstract

The aerosol technique has been employed in the preparation of uniform colloidal inorganic particles coated with an organic polymer. Specifically, spherical titania cores were produced first by hydrolysis of Ti(IV) ethoxide droplets in contact with water vapor. Hexamethylenediisocyanate liquid was then condensed on these particles and exposed to ethylenediamine vapor. By varying experimental conditions (temperature and flow rate) one attained uniform coatings of polyurea of different thickness on titania.

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This work was supported by the National Science Foundation Grant CHE 86–19509.

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