Abstract
Seven Sumitomo alumina powders of different surface areas and particle size distributions were studied with a view to determining the optimum amount of dispersant (Darvan 821A) required to stabilise aqueous suspensions prepared from the powders. Three different techniques were used; sedimentation, particle sizing and acoustophoresis. Acoustophoresis proved to be the most accurate and quickest way of establishing the optimum amount. It was also shown that the optimum amount of dispersant (0.59mg/m2/) required to stabilise the different sized alumina powders was independent of thepowder surface area/size. Sedimentation results demonstrated that the larger particles acted like hard spheres with thin double layers and gave a smaller relative sediment height than the small particles under the same conditions, i.e. volume fraction and electrolyte strength. This was because the small particles acted as soft spheres with thick double layers that resulted in the particles keeping far apart from one another and hence giving a larger sediment volume.
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References
D. J. Shaw, “Introduction to Colloid and Surface Chemistry” (Butterworth, Heinemann, 1992).
D. H. Everett, “Basic Principles of Colloid Science” (Royal Society of Chemistry, 1988).
J. Israelachvili, “Intermolecular and Surface Forces, ” 2nd edition (Academic Press, New York, 1991).
R. J. Hunter, “Foundations of Colloid Science, ” Vol. 1 (Oxford Science Publications, 1995).
R. W. O'brien, J. Fluid Mech. 212 (1990) 81–93.
R. W. O'brien, B. R. Midmore, A. Lamb and R. J. Hunter, Faraday Discussions 90 (1990) 301–312.
R. Greenwood and L. Bergstrom, J. Eur. Ceram. Soc. 17 (1997) 537–548.
C. Galassi, E. Roncari, R. Greenwood and A. Piancastelli, Proc. Fifth Euro-Ceramics Conference, Versailles, France, Key Engineering Materials 132–136 (1997) 329–332.
N. P. Miller and J. C. Berg, Coll. and Surf. 59 (1991) 119–128.
T. S. B. Sayer, Coll. and Surf. 77 (1993) 1, 39–47.
W. N. Rowlands and R. W. O'brien, J. Coll. and Inter. Sci. 175 (1995) 1, 190–200.
M. Kosmulski and J. B. Rosenholm, J. Phys. Chem. 100 (28) (1996) 11,681–11,687.
M. Deboer, R. G. Leliveld, A. J. Vandillen, J. W. Geus and H. G. Bruil, Appl. Catal. A 102(1) (1993) 35–51.
T. E. Petroff, M. Sayer and Sam.Hesp, Coll. and Surf. A 78 (1993) 235.
T. Cosgrove, T. L. Crowley, M. A. Cohen Stuart, B. Vincent and F. H. W. H. Waajen, Macromolecules 17 (1984) 1825.
R. Greenwood, P. F. Luckham and T. Gregory, Coll. and Surf. A 98 (1995) 117–125.
J. A. Baker, J. C. Berg and R. A. Pearson, Langmuir 5 (1989) 339.
M. J. Garvey, TH. F. Tadros, B. Vincent, J. Coll. and Inter. Sci. 55 (1976) 440.
R. Greenwood and K. Kendall, Paper Number 5, World Congress on Particle Technology 3, Brighton, UK, July 1998.
As ref. 4, p. 135.
As ref. 4, p. 332.
J. Cessarano III and I. A. Aksay, J. Amer. Ceram. Soc. 71(12) (1988) 1062–1067.
M. A. Faers and P. F. Luckham, Coll. and Surf. A 86 (1994) 317.
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Burke, M., Greenwood, R. & Kendall, K. Experimental methods for measuring the optimum amount of dispersant for seven Sumitomo alumina powders. Journal of Materials Science 33, 5149–5156 (1998). https://doi.org/10.1023/A:1004419617723
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DOI: https://doi.org/10.1023/A:1004419617723