Spray drying of TiO2 nanoparticles into redispersible granules
2010 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 203, no 2, 384-388 p.Article in journal (Refereed) Published
We have demonstrated how titania nanoparticles can be spray-dried to produce redispersible granules. Theevaluation of different dispersants using rheology, particle size and electrokinetic measurements showedthat an anionic carboxylated polyelectrolyte, Dispex N40, was able to stabilize the primary aggregates of thetitania nanoparticles with a size of about 180 nm at an addition of 2.4% dry-weight basis over a relativelylarge pH-range. Transmission electron microscopy showed that the commercial P-25 titania nanopowdercould not be deagglomerated down to the individual crystallite size of 15–40 nm. Spherical granules with asize between 20 and 50 μm and a minimum amount of dusty fines could be produced by spray drying theaqueous titania dispersions in a configuration with internal bag filters. The granules could be completelydisintegrated and redispersed in water by ultrasonication into a stable suspension with a size distributionthat is identical to the as-received powder. The possibility to prepare redispersible nanoparticle granules byspray drying is a route to minimize the risk of airborne exposure and facilitate the handling of nanopowders.
Place, publisher, year, edition, pages
Amsterdam, Netherlands: Elsevier B.V. , 2010. Vol. 203, no 2, 384-388 p.
Nanoparticle, Spray drying, Granule, Dispersion, Titania
Research subject Materials Chemistry
IdentifiersURN: urn:nbn:se:su:diva-46703DOI: 10.1016/j.powtec.2010.05.033ISI: 000281461700031OAI: oai:DiVA.org:su-46703DiVA: diva2:372131
ProjectsEuropean Project “SAPHIR—Safe, integrated & controlled production of high-tech multifunctional materials and their recycling”.
FunderEU, European Research Council