Investigation of adsorbed polymer layers by flocculation of oppositely charged sols - II. Determination of relative stabilizing layer thickness

S. Rohrsetzer, F. Csempesz

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Abstract

The stabilizing effect of water-soluble neutral polymers and of their 1:1 (w/w) mixtures on the mutual flocculation of a positively charged Fe2O3 sol and a negatively charged AgI was investigated. The electrical attraction potential vs. particle surface separations curves were calculated at three different electrolyte concentrations. From these curves the approximate thickness of the adsorbed polymer layer required for the stabilization (slow flocculation) was constructed. These thicknesses are denoted as relative stabilizing layer thicknesses (Hst). The adsorbed polymer amounts required for the stabilization (equivalent stabilizing amounts, ast) have also been determined at three different electrolyte concentrations. The Hst vs. ast curves are characteristic both for the stabilizing effect of the different polymers and the changes of the stabilizing layer thickness with the adsorbed amount. Furthermore, they offer a possibility to calculate whether the stabilizing effect of the mixed polymer layers does, or does not, deviate from the values of the polymer components by assuming additivity.

Original languageEnglish
Pages (from-to)1133-1136
Number of pages4
JournalColloid & Polymer Science
Volume260
Issue number12
DOIs
Publication statusPublished - Dec 1982

Fingerprint

Flocculation
Polymethyl Methacrylate
Sols
Polymers
polymers
Electrolytes
curves
Stabilization
stabilization
electrolytes
attraction
Water
water

Keywords

  • polymer mixtures
  • relative layer thickness
  • stabilization

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

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N2 - The stabilizing effect of water-soluble neutral polymers and of their 1:1 (w/w) mixtures on the mutual flocculation of a positively charged Fe2O3 sol and a negatively charged AgI was investigated. The electrical attraction potential vs. particle surface separations curves were calculated at three different electrolyte concentrations. From these curves the approximate thickness of the adsorbed polymer layer required for the stabilization (slow flocculation) was constructed. These thicknesses are denoted as relative stabilizing layer thicknesses (Hst). The adsorbed polymer amounts required for the stabilization (equivalent stabilizing amounts, ast) have also been determined at three different electrolyte concentrations. The Hst vs. ast curves are characteristic both for the stabilizing effect of the different polymers and the changes of the stabilizing layer thickness with the adsorbed amount. Furthermore, they offer a possibility to calculate whether the stabilizing effect of the mixed polymer layers does, or does not, deviate from the values of the polymer components by assuming additivity.

AB - The stabilizing effect of water-soluble neutral polymers and of their 1:1 (w/w) mixtures on the mutual flocculation of a positively charged Fe2O3 sol and a negatively charged AgI was investigated. The electrical attraction potential vs. particle surface separations curves were calculated at three different electrolyte concentrations. From these curves the approximate thickness of the adsorbed polymer layer required for the stabilization (slow flocculation) was constructed. These thicknesses are denoted as relative stabilizing layer thicknesses (Hst). The adsorbed polymer amounts required for the stabilization (equivalent stabilizing amounts, ast) have also been determined at three different electrolyte concentrations. The Hst vs. ast curves are characteristic both for the stabilizing effect of the different polymers and the changes of the stabilizing layer thickness with the adsorbed amount. Furthermore, they offer a possibility to calculate whether the stabilizing effect of the mixed polymer layers does, or does not, deviate from the values of the polymer components by assuming additivity.

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