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Colloidal aspects relating to direct incorporation of TiO2 nanoparticles into mesoporous spheres by an aerosol-assisted process
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi. (Material chemistry)
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi. (Material Chemistry)
2008 (Engelska)Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 319, nr 1, s. 144-151Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Titania nanoparticles have been incorporated into spherical mesoporous silica powders by an aerosol-assisted synthesis process from both aqueous and ethanol-based precursor dispersions. Transmission electron microscopy (TEM) showed that the titania nanoparticles exist as single particles or small aggregates within the mesoporous carrier particles and analysis of the nitrogen adsorption isotherms proved that the pore blocking of the particles is small. Particle size and zeta potential measurements showed that the addition of tetraethoxysiloxane (TEOS), and also hexadecyl trimethyl ammonium bromide (C16TAB) induced flocculation of the TiO2 nanoparticles. The higher yield and narrower size distribution of the composite powder produced from ethanol-based dispersions compared to the aqueous dispersions could be related to a smaller degree of aggregation, indicated by rheological measurements.

 

Ort, förlag, år, upplaga, sidor
2008. Vol. 319, nr 1, s. 144-151
Nyckelord [en]
Colloid, Titania, Mesoporous, Nanoparticle, Aerosol-assisted, Functionalization, Rheology
Identifikatorer
URN: urn:nbn:se:su:diva-27495DOI: 10.1016/j.jcis.2007.11.013ISI: 000252750400020OAI: oai:DiVA.org:su-27495DiVA, id: diva2:214491
Tillgänglig från: 2009-05-05 Skapad: 2009-05-05 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
Ingår i avhandling
1. Functionalization and processing of porous powders into hierarchically porous monoliths
Öppna denna publikation i ny flik eller fönster >>Functionalization and processing of porous powders into hierarchically porous monoliths
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Inorganic porous materials are widely used in a number of applications, where is a need to functionalize and produce materials with a multiscale porosity. The first part of the thesis describes how a novel and facile powder processing approach, using pulsed current processing (PCP) or, as it is commonly called, spark plasma sintering (SPS), has been employed to produce mechanically stable, hierarchically porous bodies from different porous powders.

Surfactant-templated mesoporous spheres were PCP-treated to yield meso/macro porous monoliths. The bimodal pore size can be tailored by choice of templating molecules in the aerosol-assisted synthesis process and by the particle size of the spheres. Diatomite powders were used to produce macro/macroporous monoliths. The densification behaviour of this inexpensive and renewable macroporous raw material was evaluated in detail, and an optimum temperature range was identified where the PCP process yields mechanically strong monoliths.

Binder-less, hierarchically porous zeolite monoliths were produced from various zeolite powders, e.g. silicalite-1, ZSM-5 and zeolite Y. Line-broadening analysis of X-ray powder diffraction data by the Rietveld method and electron microscopy showed that the formation of strong interparticle bonds during the PCP process is associated with a local amorphization reaction that is induced by the high contact stress and temperature. Xylene isomerisation studies showed that binder-less ZSM-5 monoliths display a high catalytic selectivity.

Direct (in-situ) nanoparticle functionalization of surfactant templated mesoporous silica particles has also been demonstrated. Pre-synthesized TiO2 nanoparticles were dispersed in a precursor solution, containing surfactant and silica source, and processed in an aerosol-generator to produce spherical nanoparticle-functionalized mesoporous particles.

 

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Physical, Inorganic and Structural Chemistry, Stockholm University, 2009. s. 79
Nyckelord
Porous, zeolite, hierarchical, monolith, nanoparticle, functionalization, amorphization, PCP, SPS, pulsed current processing, spark plasma sintering.
Nationell ämneskategori
Kemi
Forskningsämne
oorganisk kemi
Identifikatorer
urn:nbn:se:su:diva-27496 (URN)978-91-7155-880-0 (ISBN)
Disputation
2009-06-08, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2009-05-18 Skapad: 2009-05-05 Senast uppdaterad: 2010-01-15Bibliografiskt granskad

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Faure, BertrandNg, Boon SingBergström, Lennart
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Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi
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Journal of Colloid and Interface Science

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