Emulsifying Efficiency Versus Wettability and Adsorbability of Some Finely Divided Solids Having Agricultural and Pharmaceutical Significance

  • S. N. Srivastava
Chapter

Abstract

Most water-based coating formulations contain colloidal suspensions. Therefore, the stability of these dispersions is discussed in this chapter. Fine particles of a solid suspended in a liquid are known to stabilize dispersed droplets of a second liquid against coalescence owing to reasonable adsorption of solid particles and their contact angle at the liquid-liquid interface. The solid particles should also be capable of being wetted by both the liquids, but preferentially by the continuous liquid in which the dispersed solid particles form an acute contact angle. The stability of the emulsions thus promoted depends upon the interaction energy of the dispersed droplets and can be altered by the addition of surfactants, bioamphiphiles and other additives. For stability study, fine particles of the freshly precipitated hydroxides of polyvalent metals, Bordeaux mixtures, clays and drugs have been used to promote stable petroleum ether-in-water emulsions.The stability of disperesed droplets has been examined in terms of the interactio energy of the emulsion globules whose coalescence necessitates wetting of at least part one solid particle by the internal phase so as to enable the rupture of the liquid film and this process requires an energy equivalent to several hundreds of kT units. An attempt has also been made to correlate the stability of the emulsions with the interfacial characteristics, adsorption parameters, rheological properties of the liquid film with coated fine particles and their relative wetting by the internal and external phases of the emulsions investigated.

Keywords

Contact Angle Petroleum Ether Liquid Film Emulsion Droplet Stability Factor 
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References

  1. 1.
    S. U. Pickering, J. Chem. Soc., 91:2001 (1907).CrossRefGoogle Scholar
  2. 2.
    J. L. Van der Minne, Over Emulsions, Amsterdam, 66 (1928).Google Scholar
  3. 3.
    T. R. Briggs, Ind. Eng. Chem., 13:1008 (1921).CrossRefGoogle Scholar
  4. 4.
    R. M. Woodman, J. Phys. Chem., 34:299 (1930).CrossRefGoogle Scholar
  5. 5.
    A. King, and L. N. Mukerjee, J. Soc. Chem. Ind., 58:243 (1939).CrossRefGoogle Scholar
  6. 6.
    J. H. Schulman and L. Leja, Trans. Faraday Soc. 50:598 (1954).CrossRefGoogle Scholar
  7. 7.
    W. Albers and J. Th. G. Overbeek, J Coll. Sci., 14:509 (1959).Google Scholar
  8. 8.
    E. H. Lucassen-Reynders, Stabilization of water-in-oil emulsions, Utrecht, (1962).Google Scholar
  9. 9.
    M. J. Void and D. V. Rathnama, J. Phys. Chem., 64:1619 (1960).CrossRefGoogle Scholar
  10. 10.
    L. N. Mukerjee, S. N. Srivastava, Kolloid and Zeit, 147:146 (1956).CrossRefGoogle Scholar
  11. 11.
    L. N. Mukerjee and S. N. Srivastava, Kolloid and Zeit, 149:35 (1956).CrossRefGoogle Scholar
  12. 12.
    L. N. Mukerjee and S. N. Srivastava, Kolloid and Zeit, 150:144 (1957).CrossRefGoogle Scholar
  13. 13.
    S. N.. Srivastava and S. P. Jain, Kolloid Zeit, 235:1230 (1969).CrossRefGoogle Scholar
  14. 14.
    S. N. Srivastava, Progr. Colloid and Polymer Sci., 63:41 (1978).CrossRefGoogle Scholar
  15. 15.
    S. P. Jain and S. N. Srivastava, J. Surf. Sci. Tech., 3(1), 39 (1987).Google Scholar
  16. 16.
    B. Derjaguin and M. Kussakov, Acta Phys. Chem. URSS, 10:25 (1939).Google Scholar
  17. 17.
    M. V. Smoluchowski, Zeit, Physik. Chem., 92:129 (1917).Google Scholar
  18. 18.
    O. Stern, Z. Electrochemie, 30:568 (1924).Google Scholar
  19. 19.
    R. H. Ottewill et al, Trans. Faraday Soc., 56:854 (1960).CrossRefGoogle Scholar
  20. 20.
    A. W. Adamson, Physical Chemistry of Surfaces, Intersciences, 267 (1960).Google Scholar
  21. 21.
    J. Razouk, J. Phys. Chem., 45:180 (1941).Google Scholar
  22. 22.
    I. Langmuir, J. Am. Chem. Soc., 38:2221 (1916).CrossRefGoogle Scholar
  23. 23.
    B. Biswas and D. A. Haydon, Proc Roy. Soc., A271:296 (1963).CrossRefGoogle Scholar
  24. 24.
    D. W. Criddle and A. L. Meader, J. Appl. Phys., 26:838 (1955).CrossRefGoogle Scholar
  25. 25.
    F. E. Barteil and H. J. Osterhoff, Colloid Symposium Monograph, The Chemical Catalog Co., Inc., New York, 113 (1928).Google Scholar
  26. 26.
    V. K. Sharma and S. N. Srivastava, in Macro and Micro Emulsions, Theory and Practice, ACS Symposium Series, 272:398 (1985).Google Scholar
  27. 27.
    J. H. Brooks and A. E. Alexander, Proc. 3rd Int. Congr. Surf. Chem., Cologne, 535 (1960).Google Scholar
  28. 28.
    D. K. Chattoraj, J. Phys. Chem., 70:3743 (1966).CrossRefGoogle Scholar
  29. 29.
    P. Sherman, Research (London), 8:396 (1955).Google Scholar
  30. 30.
    E. G. Richardson, J. Coll, Sci., 8:396 (1955).Google Scholar
  31. 31.
    M. J. Schwuger and W. Rybinski on “Adsorption and Wetting” in “Nonionic Surfactants: Physical Chemistry”, M. J. Schick, 23:45 (1987).Google Scholar
  32. 32.
    M. J. Hey, J. W. MacTaggart, and C. H. Rochester, J. Chem. Soc. Faraday Trans., I80:699 (1984).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • S. N. Srivastava
    • 1
  1. 1.Chemical LaboratoriesAgra CollegeAgraIndia

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