A procedure is described for making aqueous silica suspensions with a desired particle size distribution. The influence of silica particles in different concentrations on foam ability in a rotor-stator mixer for different rotational speeds has been studied by means of mixing characteristics. It appears that for low liquid flow rates, the solid particles have no influence on foamability. For high liquid flow rates, foamability decreases for increasing silica content; this effect becomes smaller for high rotational speeds. Ro tational speed and silica content appear to have a combined effect on the process of foam formation.
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References
1.
Aronson, M.P. , Influence of Hydrophobic Particles on the Foaming of Aqueous Surfactant Solutions, Langmuir2, 653-659 (1986).
2.
Bikerman, J.J., "Foams," Springer-Verlag, NY, 1973, pp. 65-97.
3.
Dippenaar, A. , The Destabilization of Froth by Solids, II: The Rate-determining Step, Int. J. Miner. Process.9, 15-27 (1982).
4.
Frye, G.C., and Berg, J.C., Antifoam Action by Solid Particles, J. Colloid Interface Sci.127, 222-238 ( 1989).
5.
Frye, G.C., and Berg, J.C., Mechanisms for the Synergistic Antifoam Action of Hydrophobic Solid Particles in Insoluble Liquids, J. Colloid Interface Sci.130, 54-59 (1989).
6.
Garrett, P.R. , The Effect of Polytetrafluoroethylene Particles on the Foamability of Aqueous Surfactant Solutions, J. Colloid Interface Sci.69, 107-121 (1979).
7.
Hudales, J.B.M. , and Stein, H.N., The Influence of Solid Particles on Foam and Film Drainage, J. Colloid Interface Sci.140, 307-313 (1990).
8.
Kroezen, A.B.J. , and Groot Wassink , J., Foam Generation in Rotor-Stator Mixers, J. Soc. Dyers Color.102, 397-402 (1986).
9.
Kroezen, A.B.J., Flow Properties of Foam in Rotor-Stator Mixers and Distribution Equipment, Doctoral thesis, University of Twente, Enschede, 1988.
10.
Kruglyakov, P.M., and Taube, P.R., Syneresis and Stability of Foams containing a Solid Phase, Colloid J. 34, 194-196 (1972) [translated from Kolloidn. Zh.34, 228-230 (1972)].
11.
Lemmen, J.T.E. , Foam Finishing Technology: The Interaction of Foam with Stagnant and Moving Substrates in Foam Application, Doctoral thesis, University of Twente, Enschede , 1991.
12.
Lohmann, T. , and Pahl, M.H., Mechanische Schaumzerstörung feststof fhaltiger Schäume, Chem. Ing. Tech.65, 1362-1365 (1993).
13.
Meyers, D., "Surfactant Science and Technology," VCH Publishers Inc., NY, 1992, p. 118.
14.
Portnaya, I.B. , Mazina, G.R., Polukhina , T.I., and Panich, R.M., Effect of Chalk Filler on the Resistance of Latex Foams to Diffusional Breakdown, Colloid J. 43, 482-484 ( 1981 ) [translated from Kolloidn. Zh.43, 592-594(1981)].
15.
Portnaya, I.B. , Suchkova, L.N., Novgorovda , S.N., and Panich, R.M., Investigation of Stability of Multiphase Foams, Colloid J. 43, 718-723 (1982) [ translated from Kolloidn. Zh.43, 883-889 ( 1981)].
16.
Rosen, M.J., "Surfactants and Interfacial Phenomena," John Wiley , NY, 1989, p. 122.
17.
Ross, S., and Nishioka, G., Experimental Researches on Silicone Antifoams, in "Emulsions, Latices and Dispersions," P. Bechner and M. N. Yudenfreund, Eds., Marcel Dekker Inc., NY, 1978, pp. 237-256.
18.
Tang, F.Q., Xiao, Z., Tang, J.A., and Jiang, L., The Effect of SiO2 Particles upon Stabilization of Foam , J. Colloid Interjace Sci.131, 498-502 (1989).
19.
Topper, L., and Bauer, E., Foaminess of Aqueous Solutions of Sodium Acetate, Sodium Propionate and Sodium Butyrate and of Dilute Silica Suspensions, J. Colloid Sci.9, 495-497 ( 1954).
20.
Turner, G.P.A. , "Introduction to Paint Chemistry and Principles of Paint Technology," Chapman and Hall, London, 1988, pp. 96-108.
21.
Zollinger, H. , "Color Chemistry: Syntheses, Properties and Applications of Organic Dyes and Pigments," VCH Publishers , Weinheim, Germany, 1991, pp. 293-300.
