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Transient gelation by spinodal decomposition in colloid-polymer mixtures

Author

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  • Verhaegh, Nynke A.M.
  • Asnaghi, Daniela
  • Lekkerkerker, Henk N.W.
  • Giglio, Marzio
  • Cipelletti, Luca

Abstract

We have investigated with small angle light scattering and optical microscopy transient gelation phenomena which occur in phase-separating colloid-polymer mixtures. The scattering intensity distribution shows a peak at non-zero wave vector and satisfies the asymptotic q−4 Porod behaviour. Consistent with these observations, optical micrographs show an alternating pattern of dark and bright domains. These findings suggest that the polymer-induced depletion forces lead to the formation of a bicontinuous network of colloid-rich and colloid-poor domains, via a spinodal decomposition process. This bicontinuous network rapidly attains a gel-like character as indicated by the arrest of speckle fluctuations. The occurrence of the gel is ascribed to polymer-induced aggregation between the colloids in the colloid-rich phase. Due to the reversible nature of the aggregation the network restructures and eventually the gel collapses, as is manifested by the rapid separation of the colloid-rich phase from the colloid-poor phase.

Suggested Citation

  • Verhaegh, Nynke A.M. & Asnaghi, Daniela & Lekkerkerker, Henk N.W. & Giglio, Marzio & Cipelletti, Luca, 1997. "Transient gelation by spinodal decomposition in colloid-polymer mixtures," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 242(1), pages 104-118.
    • Handle: RePEc:eee:phsmap:v:242:y:1997:i:1:p:104-118
    DOI: 10.1016/S0378-4371(97)00184-2
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    References listed on IDEAS

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    1. van Opheusden, Joost H.J. & Bos, Martin T.A. & van der Kaaden, Gert, 1996. "Anomalous multifractal spectrum of aggregating Lennard-Jones particles with Brownian dynamics," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 227(3), pages 183-196.
    2. Verhaegh, Nynke A.M. & van Duijneveldt, Jeroen S. & Dhont, Jan K.G. & Lekkerkerker, Henk N.W., 1996. "Fluid-fluid phase separation in colloid-polymer mixtures studied with small angle light scattering and light microscopy," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 230(3), pages 409-436.
    3. DiPietro, L. & Ostfeld, A.M. & Rosner, G.L., 1994. "Adiposity and stroke among older adults of low socioeconomic status: The Chicago Stroke Study," American Journal of Public Health, American Public Health Association, vol. 84(1), pages 14-19.
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