Aging of Aqueous Laponite Dispersions in the Presence of Sodium Polystyrene Sulfonate

Authors

  • V. Savenko Taras Shevchenko National University of Kyiv, Faculty of Physics, Institut Charles Sadron, UPR22-CNRS, Universite de Strasbourg
  • L. Bulavin Taras Shevchenko National University of Kyiv, Faculty of Physics
  • M. Rawiso Institut Charles Sadron, UPR22-CNRS, Universite de Strasbourg
  • N. Lebovka Taras Shevchenko National University of Kyiv, Faculty of Physics, F.D. Ovcharenko Institute of Biocolloidal Chemistry, Nat. Acad. of Sci. of Ukraine

DOI:

https://doi.org/10.15407/ujpe59.06.0589

Keywords:

laponite, PSS–Na, aqueous suspensions, rheology, SAXS, aging

Abstract

Aqueous suspensions of Laponite with discotic particles are well-studied and find a wide range of applications in industry. A new direction of their implementation is polymer composites that can exhibit improved physical properties. We have studied the aging of aqueous suspensions of Laponite and sodium polystyrene sulfonate (PSS–Na) and both their microscopic (small-angle X-ray scattering, SAXS) and macroscopic (small amplitude oscillatory shear (SAOS) rheometry) properties. The concentration of Laponite, CL, was fixed at 2.5% wt and concentration of PSS–Na, Cp, was varied within 0–0.5% wt (0–24.2 mM). It is shown that the adding of PSS–Na significantly accelerates the aging. Nevertheless, the systems were stable against the sedimentation, and the flocculation didn’t occur. Polyelectrolyte induced the appearance of large-scale fractal heterogeneities, which became more compact in the course of the aging.

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Published

2018-10-23

How to Cite

Savenko, V., Bulavin, L., Rawiso, M., & Lebovka, N. (2018). Aging of Aqueous Laponite Dispersions in the Presence of Sodium Polystyrene Sulfonate. Ukrainian Journal of Physics, 59(6), 589. https://doi.org/10.15407/ujpe59.06.0589

Issue

Section

Soft matter

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