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Diffusion in concentrated dispersions: a study with fiber-optic quasi-elastic light scattering (FOQELS)

Abstract

A fiber-optic, quasi-elastic light-scattering instrument is described using single-mode fiber optical components, including a novel slanted exit face optode. The setup operates with homodyne signal detection. It enables the characterization of diffusion processes in concentrated dispersions up to volume concentrations of 50%.

The performance of the instrument is exemplified with results obtained from latex spheres with diameters of 226 nm and 404 nm at volume fractions from Φ=0.01 to Φ=0.5. The correlation functions are analyzed according to the second order cumulants method and the “Contin”-procedure yielding an average and a distribution function of the short-time self-diffusion coefficient,D eff s , respectively.

At high ionic strength the concentration dependence ofD eff s /D 0 is found to be in close agreement with theoretical predictions based on a multi-body interaction model of hard spheres up to Φ=0.45. With decreasing ionic strength the negative slope of the virial expansion tends to increase, presumably due to enhanced repulsive electrostatic interactions.

The described technology offers new experimental means for on-line remote control sensing of particle size in concentrated disperse systems.

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References

  1. 1.

    Pusey PN, Tough RJA (1985) In: Pecora R (ed) Dynamic light scattering. Plenum Press, New York, p 85

  2. 2.

    Pusey PN, van Mengen W (1983) J Phys (Paris) 44:285

  3. 3.

    van Veluwen A, Lekkerkerker HNW, de Kruif CG, Vrij A (1987) J Chem Phys 87:4873

  4. 4.

    Auweter H, Horn D (1985) J Colloid Interface Sci 105:399

  5. 5.

    Berne BJ, Pecora R (1976) Dynamic light scattering. Wiley, New York

  6. 6.

    Chu B (1974) Laser light scattering. Academic Press, New York

  7. 7.

    Oliver CJ (1974) In: Cummins HZ, Pike ER (eds) Photon correlation and light beating spectroscopy. Plenum Press, New York, p 151

  8. 8.

    Pusey PN, Tough RJA (1982) Adv Colloid Interface Sci 16:143

  9. 9.

    Pusey PN, Tough RJA (1983) Faraday Discuss Chem Soc 76:123

  10. 10.

    Wiese H, Horn D (1990) submitted for publication

  11. 11.

    Dickinson E (1984) Annu Rep Prog Chem Sect C 80(C):3

  12. 12.

    Russel WB, Glendinning AB (1981) J Chem Phys 74:948

  13. 13.

    Batchelor GK (1976) J Fluid Mech 74:1

  14. 14.

    Felderhof BU (1978) J Phys A 11:929

  15. 15.

    Beenakker CWJ, Mazur P (1982) Phys Lett A 91:290

  16. 16.

    Beenakker CWJ, Mazur P (1983) Phys Lett A 98:22

  17. 17.

    Beenakker CWJ, Mazur P (1984) Physica A 126:349

  18. 18.

    Thomas JC, Tjin SC (1989) J Colloid Interface Sci 129:15

  19. 19.

    Ross DA, Dhadwal HS, Dyott RB (1978) J Colloid Interface Sci 64:3

  20. 20.

    Koppel DE (1972) J Chem Phys 57:4814

  21. 21.

    Ostrowsky N, Sornette D, Parker P, Pike ER (1981) Optica Acta 28:1059

  22. 22.

    Licinio P, Delaye M, Livesey AK (1987) J Phys (Paris) 48:1217

  23. 23.

    Provencher SW (1982) Comput Phys Comm 27:213

  24. 24.

    van den Broeck C, Lostak F, Lekkerkerker HNW (1981) J Chem Phys 74:2006

  25. 25.

    Ohtsuki T, Okano K (1982) J Phys Chem 77:1443

  26. 26.

    Anderson JL, Reed CC (1976) 64:3240

  27. 27.

    Thomas JC (1989) Langmuir 5:1350

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Lilge, D., Horn, D. Diffusion in concentrated dispersions: a study with fiber-optic quasi-elastic light scattering (FOQELS). Colloid Polym Sci 269, 704–712 (1991). https://doi.org/10.1007/BF00657408

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Key words

  • Dynamic light scattering
  • fiber-optics
  • latex
  • dispersions
  • self-diffusion