Selected aspects of aqueous/aqueous two phase systems

• Autorzy: Pacek A.W.
• Języki publikacji: EN

Abstrakty

EN

It has been frequently assumed that there is a full analogy between aqueous/aqueous and oil/aqueous two phase systems. The results reported in this paper clearly indicate that this analogy is rather limited. As the interfacial tension in aqueous/aqueous systems is two-three orders of magnitude lower than in oil/aqueous systems, the mechanisms of breakage in diluted as well as the structure and stability of concentrated aqueous/aqueous dispersions are very different than oil/aqueous dispersions. Therefore, well established models describing maximum stable drop size and the limits of stability (phase inversion) in oil/aqueous systems are often not applicable in aqueous/aqueous systems.

Słowa kluczowe

EN

aqueous-aqueous dispersion; interfacial tension; maximum stable drop size; structure

PL

dyspersja; napięcie międzyfazowe

• Wydawca: West Pomeranian University of Technology. Publishing House
• Czasopismo: Polish Journal of Chemical Technology
• Rocznik: 2005
• Tom: Vol. 7, nr 4
• Strony: 24--28
• Opis fizyczny: Bibliogr. 22 poz., tab., rys.

Twórcy

autor

Pacek A.W.

• The University of Birmingham, School of Chemical Engineering, Edgbaston, Birmingham, B15 2TT, UK

Bibliografia

• (1) Zaslavsky B. Y.: Aqueous two phase partitioning, Marcel Dekker Inc., New York, 1995
• (2) Huddlestone J. G. and Lyddiatt A.: 1990, Aqueous two-phase systems in biochemical recovery. Systematic analysis, design and implementation of practical processes for the recovery of proteins, Applied Biochemistry and Biotechnology, 26, 249 - 279
• (3) Kasapis S., Morris E. R. and Norton I. T.: 1991, Physical properties of maltodextrin/gclatin system, in Gums and Stabilizers for Food Industry, Eds. Phillips G. O., Williams P. A., and Wedlock D. J., p 419 - 428
• (4) Tolstoguzov V. B.: 1996, Application of phase separated biopolymer systems, in Gums and Stabilizers for Food Industry, Eds. Phillips G. O., Williams P. A., and Wedlock D. J., p 150 - 160
• (5) Antonow Y. A., Grinberg V. Y., Zhuravskaya N. A., and Tolstoguzov V. B.: 1980, Liquid two-phase water-protein-polysaccharide systems and their processing into textured protein products, Journal of Texture Studies, 11, p 199 - 215.
• (6) Graber T. A., Andrews B. A. and Asenjo J. A.: A model for the partition of metal ions in aqueous two-phase system, 11th International Conference on Partitioning in Aqueous Two Phase Systems, Atlanta, 1999, 27 June - 2 July
• (7) Albertsson Per-Ake: (1985), History of aqueous polymer two-phase partition, in Partitioning in Aqueous Two Phase Systems, Theory, Methods, Uses and Application to Biotechnology, Edit, Walter H., Brooks D. E., and Fisher D., Academic Press, Inc., Orlando, Florida, p 1 - 10
• (8) Lewis M. J.: In Physical Properties of Foods and Food Processing Systems, Ellis Horwood Series in Food Science and Technology; Ellis Horwood, Chichester, England, 1987
• (9) Grace H. P.: 1982, Dispersion phenomena in high viscosity immiscible fluid systems and application of static mixers as dispersion devices in such systems, Chem. Eng. Comm., 14 225 - 277
• (10) Chesters A. K.: 1991, The modeling of coalescence processes in fluid-liquid dispersions: A review of current understanding, Trans. I. Chem. E., 69A, 259 - 270.
• (11) Foster T. J., Underdown J., Ferdinando D. P., and Norton I. T: 1997, Emulsion behaviour of non-gelled biopolymers mixtures, in Dickinson E. & Bergensthl B., Food colloids: proteins, lipids and polysaccharides, Cambridge: RSC)
• (12) Wolf B., Scirocco R., Frith W. J. and Norton I. T.: 2000, Shear-induced anisotropic microstructure in phase-separated biopolymer mixtures, Food Hydrocolloids, 14, 217- 225.
• (13) Pacek A. W., Ding P. and Nienow A. W.: 2001, The Effect of Volume Fraction and Impeller Speed on the Structure and Drop Size in Aqueous/Aqueous Dispersions of Phases with Different Viscosities, Chem. Eng. Sci. 56, 3247 - 3255
• (14) Pacek A. W., Moore I. P. T., Nienow A. W., Calabrese R. V.: 1994, Video Technique for Measuring Dynamics of Liquid-Liquid Dispersion During Phase Inversion, AIChE Journal, 40, pp 1940 - 1949.
• (15) Pacek A. W., Ding P., Nienow A. W. and Wedd M.: 2000, Phase separation and drop size distributions in homogeneous" Na-alginate/Na-caseinate mixture, Carbohydrate Polymers, Carbohydrate Polymers, 42, 401 - 409
• (16) Guido S. and Villone M., 1999, Measurement of interfacial tension by drop retraction analysis, J. Colloid Interface Sci., 209, 247 - 250
• (17) Janssen J. M. H. and Meijer H. E. H.: 1993, Droplet break-up mechanisms: Stepwise equilibrium versus transient dispersion J. Rheology., 37 597 - 608
• (18) Rallison J. M.: 1984, The deformation of small viscous drops and bubbles in shear flows, Ann. Rev. Fluid Mech., 16 45 - 55
• (19) Nicnow A. W., Pacek A. W., Homer J.: 1994, Fundamental studies of Phase Inversion in a Stirred Vessel, 8th European Conference on Mixing, Institution of Chemical Engineers, Symposium Series 136, pp 171 - 178
• (20) Pacek A. W., Nienow A. W., Moore A. W.: 1994, On the Structure of Turbulent Liquid-Liquid Dispersed Flow in an Agitated Vessel, Chem. Eng. Sci., 49, pp 3485 - 3498.
• (21) Wagner A. J. and Yeomans J. M.: 1998, Breakdown of Scale Invariance in the Coarsening of Phase Separating Binary Fluids, Physical Review Letters, 80, 1429 - 1432
• (22) Tanaka H.: 1994, Double Phase Separation in a Confined, Symetric Binary Mixture: Interface Quench Effect Unique to Bicontinuous Phase Separation, Physical Review Letters, 72, 3690 – 3693