Effect of Additives on Electrokinetic Properties of Colloidal Alumina Suspension

Bhattacharjee, Sudeep; Singh, Bhupendra; Besra, Laxmidhar

doi:10.1006/jcis.2002.8556

Cited by 10 publications

(4 citation statements)

References 4 publications

(4 reference statements)

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“…4 shows viscosity data of alumina suspensions (12.85 vol%) as a function of pH at a constant shear rate of 119.6 s −1 . The curve clearly shows maxima near the iep (pH [8][9]. Lower viscosity are observed in the acidic pH range and increases with increasing pH and found maximum around iep.…”

Section: Calculated Interaction Energymentioning

confidence: 83%

“…When the particle has the same charge, dispersion occurs, due to electrostatic repulsion between them. However, this manipulation of charge by controlling pH only may not be sufficient to obtain a homogeneous well-dispersed and stabilized dispersion, which is required in many ceramic forming processes [9]. Generally, the most practical way of maintaining a stable dispersion is through the use of a chemical stabilizer called a dispersant.…”

Section: Introductionmentioning

confidence: 99%

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Stability of dispersions of colloidal alumina particles in aqueous suspensions

Singh

Menchavez

Takai³

et al. 2005

Journal of Colloid and Interface Science

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175

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Section: Calculated Interaction Energymentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Stability of dispersions of colloidal alumina particles in aqueous suspensions

Singh

Menchavez

Takai³

et al. 2005

Journal of Colloid and Interface Science

Self Cite

175

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“…[7,9,11,12,16] It is based on the measurement of "streaming potential," which develops due to partial shearing of counter ions of electrical double layer from the charged particles during the relative flow of liquid. The streaming potential of alumina particles suspended in an aqueous medium was measured with a particle charge detector (PCD 03 pH) apparatus (Mutek, Herrsching, Germany), the working principle of which is described elsewhere.…”

Section: Pcd Potential Measurement Techniquementioning

confidence: 99%

Selection and Optimization of Dispersant in Ceramic Slurry Processing by Different Techniques: Comparison, Correlation, and Standardization

Singh

Jena

Besra

et al. 2007

Journal of Dispersion Science and Technology

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This article describes the selection and optimization of dispersant dosage in colloidal processing of ceramic slurry by techniques such as particle charge detector (PCD), capillary suction time (CST), rheological measurement, and wet point and flow point techniques. In general, experimental results are found to be in good agreement with each other with some degree of variation. PCD, CST, and rheological techniques are related by a simple linear function. The experimental and calculated values are well matching within an error limit of 10%. Attempt has been made to develop formula for correlating results of optimization from one technique to those obtained from another technique. The region where the suspension is well dispersed, CST is linearly correlated with PCD. The advantages and limitations of each technique have been described and discussed.

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“…A number of factors including the particle shape, particle size distribution, volume fraction of solids and the range and magnitude of the interparticle forces affect the behaviour of a concentrated suspension of ceramic particles. In general, high solids loading slurries may exhibit characteristics such as: colloidal instability, high viscosity, difficulty in adding additional powder and dilatancy during or after the mixing operation_?· 8 The present study is intended to compare two different techniques, capillary suction time (CST) and flow point measurement for determination of maximum attainable solids loading. These two simple techniques can elucidate important information regarding the properties of concentrated ceramic suspension.…”

Section: Introductionmentioning

confidence: 99%

Comparison between Capillary Suction Time (CST) and Flow Point Measurements for Determination of Highest Achievable Solids Loading in Ceramic Slurries

Singh

Menchavez

Tamura

et al. 2006

Transactions of the Indian Ceramic Society

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This paper presents the comparison of two different techniques, namely, capillary suction time (CST) and flow point measurements for determination of maximum achievable solids loading in slurries. Good agreement was observed between the two techniques for Al 2 0 3 and Y 2 0 3 • The shift in isoelectric points (iep) of the powders in presence of a dispersant was determined through zeta potential measurements on dilute suspensions. Specific free energy of interaction between oxides and dispersants was also calculated by using a model based on the electrical double layer theory of surfactant adsorption through shift in isoelectric points. The specific free energy of interaction was found to be higher for Al 2 0 3 (-L\G~p = 7.5016) compared to Y 2 0 3 (-1\G~p= 6.856), suggesting greater electrical double layer repulsion and hence, better dispersion and solids loading. It has been concluded that the measurement of CST and flow point are two simple but useful techniques for rapid evaluation of a required amount of dispersant for making any flowable suspension with maximum solids loading.

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Effect of Additives on Electrokinetic Properties of Colloidal Alumina Suspension

Cited by 10 publications

References 4 publications

Stability of dispersions of colloidal alumina particles in aqueous suspensions

Stability of dispersions of colloidal alumina particles in aqueous suspensions

Selection and Optimization of Dispersant in Ceramic Slurry Processing by Different Techniques: Comparison, Correlation, and Standardization

Comparison between Capillary Suction Time (CST) and Flow Point Measurements for Determination of Highest Achievable Solids Loading in Ceramic Slurries

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