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Distinguishing between aggregates and agglomerates of flame-made TiO2 by high-pressure dispersion
ETH, Dept Mech & Proc Engn, Inst Proc Engn, Particle Technol Lab, CH-8092 Zurich, Switzerland..
Univ Karlsruhe, Inst Mech Proc Engn & Mech, D-76128 Karlsruhe, Germany..
ETH, Dept Mech & Proc Engn, Inst Proc Engn, Particle Technol Lab, CH-8092 Zurich, Switzerland.;Rhein Westfal TH Aachen, Aachen, Germany..
Univ Karlsruhe, Inst Mech Proc Engn & Mech, D-76128 Karlsruhe, Germany..
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2008 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 181, no 3, 292-300 p.Article in journal (Refereed) Published
Abstract [en]

The potential of high-pressure dispersion (HPD) and dynamic light scattering (DLS) is explored for rapid and quantitative estimation of the extent of particle aggregation and agglomeration by analyzing the entire particle size distribution. Commercially available and tailor-made TiO2 particles by flame spray pyrolysis (FSP) were characterized by X-ray diffraction, nitrogen adsorption and transmission electron microscopy (TEM). Volume distributions of these titania particles were obtained by DLS of their electrostatically stabilized (with Na4P2O7) aqueous suspensions. Dispersing these suspensions through a nozzle at 200 to 1400 bar reduced the size of agglomerates (particles bonded by weak physical forces) resulting in bimodal size distributions composed of their constituent primary particles and aggregates (particles bonded by strong chemical or sinter forces). Sintering FSP-made particles from 200 to 800 degrees C for 4 h progressively increased the minimum primary particle size (by grain growth) and aggregate size (by neck growth and phase transformation). (c) 2007 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2008. Vol. 181, no 3, 292-300 p.
Keyword [en]
titanium dioxide, aggregates, agglomerates, dispersion, sintering, dynamic light scattering
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:uu:diva-317836DOI: 10.1016/j.powtec.2007.05.016ISI: 000253747600009OAI: oai:DiVA.org:uu-317836DiVA: diva2:1083119
Conference
International Congress on Particle Technology, MAR 26-29, 2007, Nuremberg, GERMANY
Available from: 2017-03-20 Created: 2017-03-20 Last updated: 2017-03-20

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