Mobility size development and the crystallization path during aerosol decomposition synthesis of TiO2 particles

Petri Ahonen, Jorma Joutsensaari, Olivier Richard, Unto Tapper, David Brown, Jorma Jokiniemi, Esko I. Kauppinen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

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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 and a subsequent size classification. The particles were carried to a reactor in air at temperature range of 20–1500°C. The inlet particle size of 100 and 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°C 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°C and transformed to rutile up to 1100°C with simultaneous crystallite growth. Single-crystal rutile particles were observed at temperatures with the increased mobility diameters.
Original languageEnglish
Pages (from-to)615-630
Number of pages16
JournalJournal of Aerosol Science
Volume32
Issue number5
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

Fingerprint

Crystallization
Aerosols
Titanium dioxide
Particles (particulate matter)
crystallization
decomposition
aerosol
Decomposition
rutile
Titanium oxides
Densification
Temperature
anatase
Hydrolysis
Electron microscopes
Titanium
Particle size
Single crystals
titanium
Crystals

Cite this

Ahonen, Petri ; Joutsensaari, Jorma ; Richard, Olivier ; Tapper, Unto ; Brown, David ; Jokiniemi, Jorma ; Kauppinen, Esko I. / Mobility size development and the crystallization path during aerosol decomposition synthesis of TiO2 particles. In: Journal of Aerosol Science. 2001 ; Vol. 32, No. 5. pp. 615-630.
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title = "Mobility size development and the crystallization path during aerosol decomposition synthesis of TiO2 particles",
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 and a subsequent size classification. The particles were carried to a reactor in air at temperature range of 20–1500°C. The inlet particle size of 100 and 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°C 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°C and transformed to rutile up to 1100°C with simultaneous crystallite growth. Single-crystal rutile particles were observed at temperatures with the increased mobility diameters.",
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Mobility size development and the crystallization path during aerosol decomposition synthesis of TiO2 particles. / Ahonen, Petri; Joutsensaari, Jorma; Richard, Olivier; Tapper, Unto; Brown, David; Jokiniemi, Jorma; Kauppinen, Esko I. (Corresponding Author).

In: Journal of Aerosol Science, Vol. 32, No. 5, 2001, p. 615-630.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Mobility size development and the crystallization path during aerosol decomposition synthesis of TiO2 particles

AU - Ahonen, Petri

AU - Joutsensaari, Jorma

AU - Richard, Olivier

AU - Tapper, Unto

AU - Brown, David

AU - Jokiniemi, Jorma

AU - Kauppinen, Esko I.

N1 - Project code: k7su00028

PY - 2001

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N2 - 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 and a subsequent size classification. The particles were carried to a reactor in air at temperature range of 20–1500°C. The inlet particle size of 100 and 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°C 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°C and transformed to rutile up to 1100°C with simultaneous crystallite growth. Single-crystal rutile particles were observed at temperatures with the increased mobility diameters.

AB - 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 and a subsequent size classification. The particles were carried to a reactor in air at temperature range of 20–1500°C. The inlet particle size of 100 and 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°C 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°C and transformed to rutile up to 1100°C with simultaneous crystallite growth. Single-crystal rutile particles were observed at temperatures with the increased mobility diameters.

U2 - 10.1016/S0021-8502(00)00107-5

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M3 - Article

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EP - 630

JO - Journal of Aerosol Science

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