Dispersant-free colloidal fabrication of Bi2Sr2CaCu2O8 superconducting thick films

Mora, M.; Gimeno, F.; Amaveda, H.; Angurel, L.A.; Moreno, Rodrigo

doi:10.1016/j.jeurceramsoc.2009.10.018

Cited by 4 publications

(5 citation statements)

References 26 publications

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“…The value of [η] = 2.5 and Φ m = 0.64 are obtained with perfectly spherical and monodispersed particle, but [η] increases and Φ m decreases as the particle aspect ratio increases. The value obtained with BN, [η] = 3.1 and Φ m = 0.36, are consistent with these evolutions and the values found in literature with various materials . Barnes et al .…”

Section: Resultssupporting

confidence: 91%

“…[] = 2.5 and m = 0.64 are obtained with perfectly spherical and monodispersed particle, but [] increases and m decreases as the particle aspect ratio increases. The value obtained with BN, [] = 3.1 and m = 0.36, are consistent with these evolutions and the values found in litterature with various materials 13,14 . Barnes et al 12 found an empirical formula for the intrinsic viscosity evolution with the aspect ratio of disks [] = 3 (axial ratio) /10 and leads, in this case, to an aspect ratio of approximately 10, which is consistent the aspect ratio of 16 for BN particles, considering the high polydispersity of these powders (cf.…”

Section: (6) Effect Of Solid Loadingsupporting

confidence: 88%

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Dispersion of Boron Nitride Powders in Aqueous Suspensions with Cellulose

Bouville

Deville

2014

J. Am. Ceram. Soc.

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The dispersion of nitride and carbide ceramic particles in water is difficult, due to the absence of hydroxyl groups on their surface. Boron nitride is not an exception and despite its numerous applications, no effective dispersant has been identified so far. We demonstrate here the dispersion properties of two cellulose derivatives for hexagonal boron nitride powders, hydroxyl ethyl cellulose and methyl cellulose. The effect of particle sizes and cellulose concentration was investigated. The adsorption of cellulose onto the surface of the BN particles was confirmed by isotherm adsorption.Zeta potential measurements shows a charge screening effect of the cellulose The suspensions obtained were highly loaded and stable versus pH, and thus could lead to homogeneous codispersion of BN particles and sintering additives.

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Section: Resultssupporting

confidence: 91%

Section: (6) Effect Of Solid Loadingsupporting

confidence: 88%

Dispersion of Boron Nitride Powders in Aqueous Suspensions with Cellulose

Bouville

Deville

2014

J. Am. Ceram. Soc.

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“…Cardanol and esters of 12‐hydroxy stearic acid have been shown to exhibit high performance as dispersants in concentrated alumina suspensions . Similar studies have revealed formulation strategies for suspensions of lead zirconate titanate, NiCuZn ferrite, SiC, TiO 2, ceria gadolinia, Bi 2 Sr 2 CaCu 2 O 8 ,, and BaSrTiO 3 –MgO …”

Section: Introductionmentioning

confidence: 78%

“…10,11 Cardanol and esters of 12-hydroxy stearic acid have been shown to exhibit high performance as dispersants in concentrated alumina suspensions. 12,13 Similar studies have revealed formulation strategies for suspensions of lead zirconate titanate, 14 NiCuZn ferrite, 15 SiC, 16 TiO 2,17 ceria gadolinia, 18 Bi 2 Sr 2 CaCu 2 O 8 , 19 , and BaSr-TiO 3 -MgO. 20 Mechanisms of stabilization may be inferred from the above works, but a lack of molecular level knowledge about dispersant/particle attachment makes it difficult to generalize to other particles and to solvent systems tuned for printing.…”

Section: Introductionmentioning

confidence: 95%

Mechanisms of Fatty Acid and Triglyceride Dispersant Bonding in Non‐Aqueous Dispersions of NiO

2013

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Infrared spectroscopy was used to identify the mechanism of fatty acid and triglyceride dispersant bonding to NiO in 2‐butanol for a series of triglyceride and straight chain fatty acid dispersants with systematically varied chain lengths and degrees of unsaturation. The extent of NiO deflocculation was measured using laser diffraction particle size analysis. The relative stabilities of the fatty acid/NiO dispersions were assessed through settling tests. Diffuse reflectance infrared spectroscopy indicates that the straight chain fatty acids chemisorb to NiO as alkoxides with most of the adsorbed moieties in an η2 configuration. A small fraction of the adsorbed straight chain fatty acids are either chemisorbed through the hydroxyl oxygen in an η1 configuration or physisorbed as dimers. Glycerol trioleate and Menhaden fish oil both exhibit some chemisorption through the carbonyl oxygen. Despite similarities in adsorption mechanism, the dispersants differ in their abilities to break up NiO aggregates and to prevent re‐aggregation. Dispersant characteristics favoring stability of the NiO/2‐butanol dispersion are longer carbon chain length and higher degree of unsaturation. The triglyceride structure provides a weak improvement in stability. These results are discussed in the context of recent work developing non‐aqueous inks for inkjet printing of solid oxide fuel cells.

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“…Tape casting is widely used to produce capacitors, sensors, piezoelectrics, heat sinks, and electrodes for SOFC [22][23][24] . As in any colloidal processing route, a major concern is the preparation of a well-dispersed suspension with the highest solids content, thus requiring the suitable selection of a deflocculant [25][26][27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

Processing of Copper Based Foil Hardened with Zirconia by Non-Deformation Method

et al. 2017

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Flat sintered copper and copper-zirconia substrates, with zirconia nanoparticles contents of 1 and 3 vol%, were produced by aqueous tape casting and controlled sintering. Aqueous suspensions were prepared to a solid content of 58 vol% using 3 wt% commercial binder emulsion. The green tapes were treated at 350 ºC in air to remove organics and sintered at temperatures ranging from 800 to 1000 ºC in atmosphere of Ar/5%H 2 . Copper tapes reached almost full densification at 900 ºC. Composite with 1 vol% zirconia, sintered at 800 ºC, maintained high density and provided a noticeable increase of the mechanical strength, whereas further additions up to 3 vol% reduced the densification and the resulting mechanical performance became poorer.

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Dispersant-free colloidal fabrication of Bi2Sr2CaCu2O8 superconducting thick films

Cited by 4 publications

References 26 publications

Dispersion of Boron Nitride Powders in Aqueous Suspensions with Cellulose

Dispersion of Boron Nitride Powders in Aqueous Suspensions with Cellulose

Mechanisms of Fatty Acid and Triglyceride Dispersant Bonding in Non‐Aqueous Dispersions of NiO

Processing of Copper Based Foil Hardened with Zirconia by Non-Deformation Method

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