Dispersion of TiO2 nanopowders to obtain homogeneous nanostructured granules by spray-drying

Vicent, M.; Sánchez, E.; Santacruz, Isabel; Moreno, Rodrigo

doi:10.1016/j.jeurceramsoc.2011.01.026

Cited by 46 publications

(45 citation statements)

References 18 publications

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“…It means that only these amounts of PAA were adsorbed on the particles. Consequently, the calculated amount of adsorbed dispersant (mass fraction of PAA adsorbed divided by particle specific surface area) in both cases was 0.8 mg/m 2 which agrees with previous reported data [7]. With this information concentrated aqueous suspensions of 10 vol.% (Yn, Ys and Ysn) were prepared which exhibited adequate rheological behaviour and stability so as to be injected into the plasma plume without sedimentation or clogging problems.…”

Section: Coating Deposition and Characterisationsupporting

confidence: 90%

“…As reported elsewhere zeta potential represents the main indicator of the dispersion degree of a given suspension [7]. Therefore, the determination of this suspension characteristic and consequently the interpretation of colloidal interactions occurring in the suspension should be the first step when a concentrated, SPS feedstock is to be prepared.…”

Section: Introductionmentioning

confidence: 92%

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Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Carpio

Bannier

Salvador

et al. 2015

Surface and Coatings Technology

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Estimation of the length of the manuscript (the pages of the manuscript should be numbered) Number of words Please fill outPlease fill out Length of the text 1) (using "word count") 3716 Number of Tables 1 × 150 3) Total number of words: 4000 words for a contributed paper (oral and posters), 8000 words for an invited paper and plenary paper. Manuscripts exceeding these word limits will not be considered for publication in the Proceedings volume. These too long papers could be submitted to the Editor of the journal for publication as regular papers. AbstractIn this work, aqueous suspensions feedstocks with different particle size distribution from submicron-and nano-sized YSZ powders were prepared. A previous colloidal characterisation allowed concentrated suspensions (~40 wt%) to be prepared. These suspensions were then successfully deposited by suspension plasma spraying (SPS) onto stainless steel substrates at different spraying distances. Coatings were characterised in terms of microstructure and mechanical properties (hardness and elastic modulus) by nanoindentation.All coatings displayed a two-zones microstructure formed by partially molten melted areas containing nanometer or submicrometer-sized particles surrounded by fully molten melted areas. These partially molten melted areas strongly increased as standoff distance lengthened. Mechanical properties worsened with spraying distance increase.The finer the feedstock particle size the more the spraying distance effect was. A clear correlation between mechanical properties and amount of partially molten melted areas has been proved. Thus the use of a mixture of nano/submicron-sized particles as a SPS feedstock can represent a good balance between suspension processability and final coating performance.

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Section: Coating Deposition and Characterisationsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 92%

Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Carpio

Bannier

Salvador

et al. 2015

Surface and Coatings Technology

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“…The specific surface area was measured by the N 2 adsorption method (Monosorb Surface Area Analyser MS13, Quantachrome Co., USA). A complete characterisation of the P-25 nanopowder was done in a previous work [26]. Differential thermal analysis and thermogravimetric analyses (DTA/TG, STAY09, Netzsch, Germany) showed that the P25-powder had a weight loss lower than 2.5 wt%, while the dry powder obtained from the W740X-suspension had a weight loss of 4.5 wt%.…”

Section: Methodsmentioning

confidence: 99%

“…In this case, 25 wt% solids content nanosuspensions were used for spray-drying. Vicent et al studied the dispersion of titania nanopowders in water and established a simple route to prepare concentrated suspensions of nanoparticles by dispersing the nanopowders using commercially available colloidal suspensions as a dispersing medium [26,27]. This allowed to increase the solids loading to  30 vol.% (i.e.…”

Section: Introductionmentioning

confidence: 99%

Dispersion of mixtures of submicrometer and nanometre sized titanias to obtain porous bodies

Vicent

Sánchez

Molina

et al. 2013

Ceramics International

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The stability and rheological behaviour of bimodal titania suspensions was studied.Bimodal mixtures were prepared by mixing nanosized TiO 2 powders with an average primary size of ~20-40 nm and surface area of ~50 m 2 /g and/or a colloidal titania suspension of the same nanopowders dispersed in water with a submicrometer sized titania. The dispersing conditions were studied as a function of pH, type and content of dispersant, and sonication time for a constant solids content of 30 vol.% (62 wt%). The mixtures were slip cast and presintered at low temperatures (800−1000 ºC) in order to obtain porous materials with anatase as the major phase. The pore size distribution, microstructure and phase composition were characterised using MIP, SEM and XRD techniques, respectively.

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“…Mixtures of submicronic alumina (A) and nanometric titania (T) were always prepared at a relative weight ratio of 87:13. The colloidal stability and the rheological behaviour of concentrated suspensions of nanosized titania powders have been studied elsewhere [18,19]. Suspensions were prepared to a solids loading of 40 vol.% using a commercial polyacrylic acid-based polyelectrolyte (DURAMAX TM D-3005, Rohm & Haas, USA) as a deflocculant.…”

Section: Methodsmentioning

confidence: 99%

Enhanced properties of alumina–aluminium titanate composites obtained by spark plasma reaction-sintering of slip cast green bodies

Borrell

Salvador

Rocha

et al. 2013

Composites Part B: Engineering

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Dispersion of TiO2 nanopowders to obtain homogeneous nanostructured granules by spray-drying

Cited by 46 publications

References 18 publications

Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Dispersion of mixtures of submicrometer and nanometre sized titanias to obtain porous bodies

Enhanced properties of alumina–aluminium titanate composites obtained by spark plasma reaction-sintering of slip cast green bodies

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