Abstract
From the measurements of surface potentials of quartz capillaries before and after adsorption of poly(ethylene oxides) (PEO) of various molecular mass, an assessment of the equilibrium hydrodynamic thicknessδ of the adsorption layers has been obtained. The results have been compared with those of independent measurements of δ. The flow of the polymer solution under increasing pressure drops at the ends of a capillary, which causes the corresponding shear stress (τ) on the surface of adsorbed PEO layers, results in the deformation of the latter, which manifests itself in decreasing 5. Theδ values decrease by several times when the shear stress τ rises to 2×102 N m−2. Such values of τ have been obtained using thin capillaries (r = 5÷6 mm) and by application of the capillary electrokinetic method with pressure drops up to 5÷6 MPa.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 31–37, January, 1994.
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Sergeeva, I.P., Sobolev, V.D. & Churaev, N.V. Hydrodynamic thickness and deformational properties of adsorption layers of poly(ethyleneoxides). Russ Chem Bull 43, 22–28 (1994). https://doi.org/10.1007/BF00699129
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DOI: https://doi.org/10.1007/BF00699129