Electrokinetic sonic amplitude measurement of concentrated alumina suspensions: Effect of electrosteric stabilization

Sarraf, Hamid; Herbig, R.

doi:10.2109/jcersj2.116.928

Cited by 15 publications

(36 citation statements)

References 13 publications

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“…When there is a density difference between the particles and the aqueous suspension, this motion would generate an alternating acoustic wave of the same frequency as the applied field. This phenomenon is called the ESA effect and the particle diameter measured is termed the ESA diameter (Sarraf & Herbig, 2008). These results clearly show the strong dependence of the zeta potential and the ESA diameter of particles on slurry pH.…”

Section: Zeta Potential Measurementsmentioning

confidence: 64%

Particle Characterisation and Grinding Behaviour of Gamma-Alumina Slurries Prepared in a Stirred Media Mill

Adegbite¹

2012

JMSR

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This paper investigates gamma-alumina slurry preparation in a stirred media mill to develop protocols for the characterisation of slurries for coating onto monolithic catalyst supports. The relationship between the pH and the zeta potential of particles is determined. The gamma–alumina particles are found to be optimally stabilised at a pH of 4 and zeta potential of +41 mV. The grinding behaviour of gamma-alumina particles inside the mill is determined in terms of the number of stress events (SN), stress energy (SE) and the specific energy (E_m,p). The visualisation of the particles at different stages of milling is done by scanning electron microscope (SEM). The results show that finer particles are produced by increasing milling duration from 0 – 240 min due to an increase in SN and that the use of smaller grinding media inside the mill produced finer particles due to an efficient consumption of E_m,p.

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Section: Zeta Potential Measurementsmentioning

confidence: 64%

Particle Characterisation and Grinding Behaviour of Gamma-Alumina Slurries Prepared in a Stirred Media Mill

Adegbite¹

2012

JMSR

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“…The use of Dolapix dispersant is based on the Zeta potential and rheological studies which show that to obtain stable suspensions 2 wt% of Dolapix was formulated. Dolapix dispersant is a particular dispersant based on a polycarboxylic acid which confers stability of the suspension by electrosteric interactions, with a pH of 9 . After milling, the barbotine is separated from the balls by sieving and rinsing with the dispersion medium and the powder is dried overnight in an oven at a temperature of 220°C.…”

Section: Methodsmentioning

confidence: 99%

Sintering behavior of magnesium aluminate spinel MgAl₂O₄ synthesized by different methods

Mouyane

Jaber

Bendjemil

et al. 2019

Int J Applied Ceramic Tech

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This paper is focusing basically on the ceramic technology, of which several methods for the synthesis of MgAl2O4 have been investigated. The synthesis conditions regarding the powders cleanliness, microstructure, and sintering parameters of MgAl2O4 were studied. MgAl2O4 powder was synthesized via conventional solid‐state route using different milling process: vertical attrition milling, WAB as a high‐energy horizontal attrition milling, and Pulverisette as a planetary ball miller, and via solution combustion route using Urea, Glycine, and a mixture of Urea/Glycine. Urea and Glycine was used as fuel. The white powders were obtained for all solid‐state routes and for Urea‐combustion technique. The black and gray powders were obtained in the case of combustion technique, respectively, using a fuel of Glycine and Glycine/Urea mixture. The obtained powders and pellets were characterized by XRD, SEM, and Dilatometry. The results show that, among all the solid‐state route processes, wet attrition milling gives the better and clean spinel phase. The WAB milling and Pulverisette miller introduce a contamination by some yttria‐stabilized zirconia balls in the corresponding powder. Furthermore, the flash combustion technique permit to have nanoparticles with a dense spinel phase of MgAl2O4 and with lower sintering temperature in less time and with no calcination step.

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“…This repulsive barrier can be achieved by electrostatic or steric stabilization mechanisms, which depend on the liquid medium and the composition of the powder. 117,119,120) Therefore, special effort is inevitable for the control of defects and to tailor the microstructure of wet foams. The physical properties of colloidal systems depend on the viscosity of the liquid, the amount of solids, the size distribution of the solids, and interactions between the solid particles, and between the solid and liquid.…”

Section: Rheological Propertiesmentioning

confidence: 99%

Wet Foam Stability from Colloidal Suspension to Porous Ceramics: A Review

Kim¹,

Park²,

Han³

et al. 2019

J. Korean Ceram. Soc

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Porous ceramics are promising materials for a number of functional and structural applications that include thermal insulation, filters, bio-scaffolds for tissue engineering, and preforms for composite fabrication. These applications take advantage of the special characteristics of porous ceramics, such as low thermal mass, low thermal conductivity, high surface area, controlled permeability, and low density. In this review, we emphasize the direct foaming method, a simple and versatile approach that allows the fabrication of porous ceramics with tailored microstructure, along with distinctive properties. The wet foam stability is achieved under the controlled addition of amphiphiles to the colloidal suspension, which induce in situ hydrophobization, allowing the wet foam to resist coarsening and Ostwald ripening upon drying and sintering. Different components, like contact angle, adsorption free energy, air content, bubble size, and Laplace pressure, play vital roles in the stabilization of the particle stabilized wet foam to the porous ceramics. The mechanical behavior of the load-displacements curves of sintered samples was investigated using Herzian indentations testes. From the collected results, we found that microporous structures with pore sizes from 30 µm to 570 µm and the porosity within the range from 70% to 85%.

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Electrokinetic sonic amplitude measurement of concentrated alumina suspensions: Effect of electrosteric stabilization

Cited by 15 publications

References 13 publications

Particle Characterisation and Grinding Behaviour of Gamma-Alumina Slurries Prepared in a Stirred Media Mill

Particle Characterisation and Grinding Behaviour of Gamma-Alumina Slurries Prepared in a Stirred Media Mill

Sintering behavior of magnesium aluminate spinel MgAl₂O₄ synthesized by different methods

Wet Foam Stability from Colloidal Suspension to Porous Ceramics: A Review

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Electrokinetic sonic amplitude measurement of concentrated alumina suspensions: Effect of electrosteric stabilization

Cited by 15 publications

References 13 publications

Particle Characterisation and Grinding Behaviour of Gamma-Alumina Slurries Prepared in a Stirred Media Mill

Particle Characterisation and Grinding Behaviour of Gamma-Alumina Slurries Prepared in a Stirred Media Mill

Sintering behavior of magnesium aluminate spinel MgAl2O4 synthesized by different methods

Wet Foam Stability from Colloidal Suspension to Porous Ceramics: A Review

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Product

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Sintering behavior of magnesium aluminate spinel MgAl₂O₄ synthesized by different methods