Aerosol synthesis of titanium oxide particles by in-droplet hydrolysis method

Anna Moisala, Petri Ahonen, Olivier Richard, Unto Tapper, Esko Kauppinen, Jean-Claude Joubert, Jean Deschanvres

    Research output: Contribution to conferenceConference AbstractScientific

    Abstract

    A method to produce titanium oxide powders by in-droplet hydrolysis of metal alkoxide precursor was studied. Onset of titanium dioxide crystallization on the aerosol particles was investigated. Titanium hydrous oxide particles were prepared starting from an acetic acid modified titanium alkoxide precursor solution aerosol at 200 °C in tube flow reactor. Titanium n-tetrabutoxide, hydrolysis water, and acetic acid were included in the ethanolic precursor solution that was nebulized. The droplets were transported to a tubular flow reactor where the chemical reactions formed solid particles. The powders were characterized by XRD, TG-SDTA, BET, SEM, TEM, EDS, XRF, IR- spectroscopy, and with aerosol impactor. Micron sized powder particles were amorphous, smooth on the surface, and either spherical or deflated in shape. Subsequently, titanium dioxide particles were produced by thermal post-annealing of the powders in air. The onset of crystallization of aerosol particles to nanocrystalline TiO2 was investigated at 500 °C reactor temperature. Thinned particles were studied and the initial crystallization was observed to be localized on the surface of the particles.
    Original languageEnglish
    Publication statusPublished - 2000
    MoE publication typeNot Eligible
    Event2000 AIChE Annual Meeting - Los Angeles, United States
    Duration: 12 Nov 200017 Nov 2000

    Conference

    Conference2000 AIChE Annual Meeting
    CountryUnited States
    CityLos Angeles
    Period12/11/0017/11/00

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    Moisala, A., Ahonen, P., Richard, O., Tapper, U., Kauppinen, E., Joubert, J-C., & Deschanvres, J. (2000). Aerosol synthesis of titanium oxide particles by in-droplet hydrolysis method. Abstract from 2000 AIChE Annual Meeting, Los Angeles, United States.