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Titolo:
Mobility size development and the crystallization path during aerosol decomposition synthesis of TiO2 particles
Autore:
Ahonen, PP; Joutsensaari, J; Richard, O; Tapper, U; Brown, DP; Jokiniemi, JK; Kauppinen, EI;
Indirizzi:
VTT Chem Technol, VTT Aerosol Technol Grp, FIN-02044 Vtt, Finland VTT ChemTechnol Vtt Finland FIN-02044 chnol Grp, FIN-02044 Vtt, Finland
Titolo Testata:
JOURNAL OF AEROSOL SCIENCE
fascicolo: 5, volume: 32, anno: 2001,
pagine: 615 - 630
SICI:
0021-8502(200105)32:5<615:MSDATC>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
NANOCRYSTALLINE TITANIA POWDERS; VAPOR-PHASE SYNTHESIS; TRANSFORMATION;
Keywords:
titanium dioxide; ultrafine particles; crystal formation; dynamic shape factors;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Kauppinen, EI VTT Chem Technol, VTT Aerosol Technol Grp, POB 1401, FIN-02044 Vtt, Finland VTT Chem Technol POB 1401 Vtt Finland FIN-02044 tt, Finland
Citazione:
P.P. Ahonen et al., "Mobility size development and the crystallization path during aerosol decomposition synthesis of TiO2 particles", J AEROS SCI, 32(5), 2001, pp. 615-630

Abstract

Size and morphology transformation as well as the crystallization path of monodisperse titanium dioxide particles were studied in aerosol flow reactor. Solid, hydrated titanium oxide particles were prepared from titanium alkoxide by a droplet hydrolysis acid a subsequent size classification. The particles were carried to a reactor in air at temperature range of 20-1500 degreesC. The inlet particle size of 100 and 200 nm gradually decreased 40% with increasing temperature as investigated by a tandem differential mobility analyzer (TDMA) system. The decrease was due to decomposition of the hydrated Ti-O particles. densification of the forming TiO2 particles, and a phase change from anatase to rutile. Above 1000 degreesC the mobility size increased due to crystal-habit formation that created faceted, elongated particles and consequently an increased dynamic shape factor. Microstructure investigations with a transmission electron microscope (TEM) showed that nanocrystalline anatase particles were present at 600 degreesC and transformed to rutile up to 1100 degreesC with simultaneous crystallite growth. Single-crystal rutile particles were observed at temperatures with the increased mobility diameters. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 12:02:16