Effect of Particle Size on Colloidal Zirconia Rheology at the Isoelectric Point

Leong, Yee-Kwong; Scales, Peter J.; Healy, Thomas W.; Boger, David V.

doi:10.1111/j.1151-2916.1995.tb08638.x

Cited by 104 publications

(85 citation statements)

References 21 publications

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“…This exponent is identical to that obtained for a number of oxide suspensions by Thomas (1961), but smaller than that reported (b = 4) in other concentrated suspensions (Leong et al, 1995;Ramakrishnan et al, 1996).…”

supporting

confidence: 87%

“…The agreement is in general good, giving an average percentage deviation of ---4.3. The exponent determined for the particle diameter, 0.5, is somewhat smaller to those reported in other oxide suspensions, 1-2 (Leong et al, 1995;Ramakrishnan and Malghan, 1996). However, the existence in the lateritic samples of two types of solids heterocoagulated at the IEP can not be ruled out for the differences found.…”

contrasting

confidence: 44%

“…In polydisperse systems, the rheological behavior is usually dominated by the fine particles (Leong et al, 1995).…”

Section: Mineralogical Characterizationmentioning

confidence: 99%

“…The yield stress ('r0) was shown to follow a power relationship with concentration and particle size of the type (Leong et al, 1995):…”

Section: The Effect Of Particle Size and Solid Concentrationmentioning

confidence: 99%

“…For this purpose, the flow behavior of the bulk (--<80 txm) and the colloidal (-<2 Ixm) fractions of lateritic samples with different serpentine/goethite ratios are compared. Also, the effects of particle concentration and size on the yield stress at the IEP of each sample is analyzed following the work of Leong et al (1995). Viscosity is commonly used to describe how suspensions flow, but this is a shear rate-dependent property.…”

Section: Introductionmentioning

confidence: 99%

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Mineral-Content and Particle-Size Effects on the Colloidal Properties of Concentrated Lateritic Suspensions

Cerpa

García‐González²,

Tartaj

et al. 1999

Clays and clay miner.

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Abstrac~The rheological behavior of concentrated lateritic suspensions from Cuba is affected by mineral composition and particle size. Electrophoretic mobility and yield stress were considered. The lateritic samples were found to be mostly composed of mixtures of serepentine and goethite in varying proportions. The flow properties of the lateritic suspensions are strongly affected by the mineral composition and particle size. This result was determined by comparison of flow properties of the bulk sample and the colloidal fraction. The electrokinetic curves suggest that heterocoagulation is present in all samples, with a zeta potential minimum at the isoelectric point (IEP), which varies with the serpentine to goethite ratio. A relationship between yield stress (7o) and the sample volume fraction (~) and particle size (d) was obtained at the IEP from the expression % = kd03/d ~ with the constant k dependent on the sample serpentine to goethite ratio.

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supporting

confidence: 87%

contrasting

confidence: 44%

“…In polydisperse systems, the rheological behavior is usually dominated by the fine particles (Leong et al, 1995).…”

Section: Mineralogical Characterizationmentioning

confidence: 99%

“…The yield stress ('r0) was shown to follow a power relationship with concentration and particle size of the type (Leong et al, 1995):…”

Section: The Effect Of Particle Size and Solid Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mineral-Content and Particle-Size Effects on the Colloidal Properties of Concentrated Lateritic Suspensions

Cerpa

García‐González²,

Tartaj

et al. 1999

Clays and clay miner.

View full text Add to dashboard Cite

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Stabilization of Isolated Hydrous Amorphous and Tetragonal Zirconia Nanoparticles Through the Formation of a Passivating Alumina Shell

Kirsch

Tolbert

2003

Adv Funct Materials

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In this work, we explore the high‐temperature phase stability of isolated, alumina‐coated zirconia nanocrystals with a goal of understanding how interfacial energy affects phase stability. Isolated tetragonal and hydrous amorphous zirconia colloids were synthesized and coated with alumina through the hydrolysis of aluminum isopropoxide. Alumina‐coated samples exhibited phase behavior that was markedly different from that of the uncoated analogs. Uncoated tetragonal particles transformed to the monoclinic phase at 1100 °C while alumina‐coated tetragonal particles did not transform until 1400 °C. Uncoated hydrous amorphous particles crystallized to the tetragonal phase after heating at 600 °C and transformed to the monoclinic phase after heating at 800 °C. Alumina‐coated hydrous amorphous particles crystallized only after heating at 1050 °C, and transformed to the monoclinic phase after heating at 1400 °C. Differences in phase behavior are postulated to depend on the zirconia–alumina interface, which must be disrupted before zirconia particles can fuse and facilitate the tetragonal‐to‐monoclinic phase transition. By coating the nanocrystals with a thin alumina shell and studying the resultant phase stability, we explore the effect of reproducibly modified interfacial chemistry on phase behavior in nanoscale ceramic composites.

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Surface force arising from adsorbed graphene oxide in alumina suspensions with different shape and size

et al. 2013

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The effects of graphene oxide (GO) on the yield stress-pH of a-Al 2 O 3 (alumina) suspensions were investigated. For micron-sized platelet alumina suspensions, micron-sized GO additive increased the maximum yield stress by as much as six-folds. This was attributed to GO-mediated bridging interactions between the platelet particles. This type of bridging interactions was much less effective with submicron-sized, spherical, and irregular shape alumina. Adsorption of the anionic GO reflected by the shift of pH of zero zeta potential to a lower pH is particularly high for platelet alumina. The 1.0 dwb % GO concentration added is sufficient to reinforce each platelet particle-particle bond, assisted by a directed GO-platelet interaction configuration. This is, however, not true with submicron-sized particles as the particle concentration increases sharply with the inverse of the particle diameter to power of 3. Moreover, a GO sheet can adsorb several submicron-sized particles and this does not produce the right interaction configuration.

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Effect of Particle Size on Colloidal Zirconia Rheology at the Isoelectric Point

Cited by 104 publications

References 21 publications

Mineral-Content and Particle-Size Effects on the Colloidal Properties of Concentrated Lateritic Suspensions

Mineral-Content and Particle-Size Effects on the Colloidal Properties of Concentrated Lateritic Suspensions

Stabilization of Isolated Hydrous Amorphous and Tetragonal Zirconia Nanoparticles Through the Formation of a Passivating Alumina Shell

Surface force arising from adsorbed graphene oxide in alumina suspensions with different shape and size

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