High solids loading ceramic colloidal dispersions in UV curable media via comb-polyelectrolyte surfactants

Hazan, Yoram de; Heinecke, Judit; Weber, Alfred P.; Graule, Thomas

doi:10.1016/j.jcis.2009.05.012

Cited by 78 publications

(53 citation statements)

References 42 publications

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“…Figure 3 shows the evolution of zeta potential of the alumina nanopowders as a function of pH for suspensions without and with 1, 2 and 4 wt% PAA. The IEP of the AluC nanopowder occurs at pH around 9, in good agreement with the values typically reported in the literature [20]. The IEP shifts to acidic pHs as the concentration of PAA increases until a value of the IEP of ~ 4 is reached when 4 wt% PAA is added.…”

Section: Starting Raw Materials Characterisation and Its Colloidal Behsupporting

confidence: 90%

Study of colloidal behaviour and rheology of Al2O3–TiO2 nanosuspensions to obtain free-flowing spray-dried granules for atmospheric plasma spraying

Vicent

Sánchez

Mallol

et al. 2013

Ceramics International

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This work deals with the dispersion and stabilisation of nanosized Al 2 O 3 and TiO 2 particles in aqueous medium. The dispersing conditions were studied as a function of pH, dispersant content, solid loading and ageing.Well-dispersed nanosuspensions of Al 2 O 3 with solids contents up to 15 vol.% and TiO 2 with solids contents up to 30 vol.% were obtained by dispersing each type of nanoparticles with 4 wt% of polyacrylic acid-based polyelectrolyte. In order to obtain a concentrated 87 wt% Al 2 O 3 -13 wt% TiO 2 suspension, a 15 vol.% homogeneous nanosuspension, composed by alumina and titania nanopowders, was prepared and then reconstituted by spray-drying into free-flowing powders. This spray-dried powder showed an adequate granule size distribution, a very high flowability and a reasonable density for diverse purposes, such as to be used in atmospheric plasma spraying as a feedstock to obtain nanostructured coatings. Keywords A. SuspensionsA. Spray-drying B. Nanoparticle

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Section: Starting Raw Materials Characterisation and Its Colloidal Behsupporting

confidence: 90%

Study of colloidal behaviour and rheology of Al2O3–TiO2 nanosuspensions to obtain free-flowing spray-dried granules for atmospheric plasma spraying

Vicent

Sánchez

Mallol

et al. 2013

Ceramics International

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“…[225,238] The occurrence of cracks due to uncured photocuring liquid can be caused by an intensified shrinking at thermal debinding, relative to the rest of the green body structure. [213,240] Besides the structure design and the machine parameters in CSL, the composition and the rheological properties of the photocuring liquid can also be varied. In order to achieve an optimal interconnection between the cured layers and smooth surfaces of the cured structure, a viscosity of the photocuring liquid in the range of 10-5000 mPaÁs has proved to be beneficial.…”

Section: Prospects and Challengesmentioning

confidence: 99%

“…A photocuring liquid of low viscosity helps to wet the surface of a newly formed polymer layer with less surface distortions and is easier to be removed from a finished, cured structure than a highly viscous photocuring liquid would be. [223,240,241] Dispersions that contained up to 58 vol% of alumina particles of an average size of 0.5 mm, together with an amount of 0.6 wt% of a dispersant, have been tested successfully as the photocurable ceramic dispersions based on acrylate derivatives with the highest amount of fillers. [224] Studies show that the photocuring activity correlates with the liquid viscosity, as photocuring itself is dependent on diffusion processes.…”

Section: Prospects and Challengesmentioning

confidence: 99%

Additive Manufacturing of Ceramic‐Based Materials

et al. 2014

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This paper offers a review of present achievements in the field of processing of ceramic-based materials with complex geometry using the main additive manufacturing (AM) technologies. In AM, the geometrical design of a desired ceramic-based component is combined with the materials design. In this way, the fabrication times and the product costs of ceramic-based parts with required properties can be substantially reduced. However, dimensional accuracy and surface finish still remain crucial features in today's AM due to the layer-by-layer formation of the parts. In spite of the fact that significant progress has been made in the development of feedstock materials, the most difficult limitations for AM technologies are the restrictions set by material selection for each AM method and aspects considering the inner architectural design of the manufactured parts. Hence, any future progress in the field of AM should be based on the improvement of the existing technologies or, alternatively, the development of new approaches with an emphasis on parts allowing the near-net formation of ceramic structures, while optimizing the design of new materials and of the part architecture.

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“…Handling of nanoparticulate systems is difficult and hazardous due to their volatility and the subsequent inhalation risks. One of the most extended routes to allow handling of nanoparticulate systems is the production of free-flowing agglomerates from colloidal suspensions subjected to a controlled drying process, such as spray and freeze drying [18][19][20][21][22][23].…”

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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High solids loading ceramic colloidal dispersions in UV curable media via comb-polyelectrolyte surfactants

Cited by 78 publications

References 42 publications

Study of colloidal behaviour and rheology of Al2O3–TiO2 nanosuspensions to obtain free-flowing spray-dried granules for atmospheric plasma spraying

Study of colloidal behaviour and rheology of Al2O3–TiO2 nanosuspensions to obtain free-flowing spray-dried granules for atmospheric plasma spraying

Additive Manufacturing of Ceramic‐Based Materials

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

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