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Title: Interactions between mica surfaces in sodium polyacrylate solutions containing calcium ions

Abstract

Polyacrylic acid (PAA) and its salts find use in a number of different applications, such as in fluids for secondary oil recovery, as dispersing agents for mineral suspensions in, for example, ceramic and paper coating applications, and as flocculants for waste-water treatment. The forces acting between negatively charged muscovite mica surfaces immersed in solutions containing sodium polyacrylate (NaPAA) have been studied. No evidence for PAA adsorption in the absence of calcium ions in the solution was found. However, at a CaCl[sub 2] concentration of about 3 [times] 10[sup [minus]3] M a layer of PAA adsorbed on each surface. At large separations, the forces between the PAA-coated surfaces were dominated by repulsive double-layer forces. At separations below 50--80 [angstrom], depending on the solution conditions, an attractive force in excess of the van der Waals attraction was observed. The adhesion force between the layers was 7-8 mN / m at pH 6 and increased somewhat with increasing pH to about 9 mN/m at pH 10. The authors argue that both the long-range attraction and the adhesion force primarily are due to COO[sup [minus]]-Ca[sup 2+]-[sup [minus]]OOC bridges between the opposing surfaces and possibly charge correlation effects. It was found that calcium ions bindmore » to the PAA and to the mica surface, whereby the electrostatic repulsion between the polyelectrolyte and the surface is lowered. The authors suggest that this is the main reason why calcium ions promote the adsorption of PAA onto negatively charged minerals. However, it also seems likely that calcium ions increase the attractive interactions between the surface and the PAA segments.« less

Authors:
;  [1];  [2]
  1. Royal Inst. of Tech., Stockholm (Sweden). Dept of Physical Chemistry
  2. Auburn Univ., AL (United States). Dept. of Chemical Engineering
Publication Date:
OSTI Identifier:
5846469
Resource Type:
Journal Article
Journal Name:
Journal of Colloid and Interface Science; (United States)
Additional Journal Information:
Journal Volume: 161:1; Journal ID: ISSN 0021-9797
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; MICA; SORPTIVE PROPERTIES; POLYACRYLATES; ADSORPTION; ADDITIVES; CALCIUM; CATALYTIC EFFECTS; DISPLACEMENT FLUIDS; SURFACE COATING; SURFACE PROPERTIES; VAN DER WAALS FORCES; WATER TREATMENT; ALKALINE EARTH METALS; DEPOSITION; ELEMENTS; ESTERS; FLUIDS; METALS; MINERALS; ORGANIC COMPOUNDS; ORGANIC POLYMERS; POLYMERS; POLYVINYLS; SILICATE MINERALS; SORPTION; 400201* - Chemical & Physicochemical Properties

Citation Formats

Berg, J M, Claesson, P M, and Neuman, R D. Interactions between mica surfaces in sodium polyacrylate solutions containing calcium ions. United States: N. p., 1993. Web. doi:10.1006/jcis.1993.1457.
Berg, J M, Claesson, P M, & Neuman, R D. Interactions between mica surfaces in sodium polyacrylate solutions containing calcium ions. United States. https://doi.org/10.1006/jcis.1993.1457
Berg, J M, Claesson, P M, and Neuman, R D. Mon . "Interactions between mica surfaces in sodium polyacrylate solutions containing calcium ions". United States. https://doi.org/10.1006/jcis.1993.1457.
@article{osti_5846469,
title = {Interactions between mica surfaces in sodium polyacrylate solutions containing calcium ions},
author = {Berg, J M and Claesson, P M and Neuman, R D},
abstractNote = {Polyacrylic acid (PAA) and its salts find use in a number of different applications, such as in fluids for secondary oil recovery, as dispersing agents for mineral suspensions in, for example, ceramic and paper coating applications, and as flocculants for waste-water treatment. The forces acting between negatively charged muscovite mica surfaces immersed in solutions containing sodium polyacrylate (NaPAA) have been studied. No evidence for PAA adsorption in the absence of calcium ions in the solution was found. However, at a CaCl[sub 2] concentration of about 3 [times] 10[sup [minus]3] M a layer of PAA adsorbed on each surface. At large separations, the forces between the PAA-coated surfaces were dominated by repulsive double-layer forces. At separations below 50--80 [angstrom], depending on the solution conditions, an attractive force in excess of the van der Waals attraction was observed. The adhesion force between the layers was 7-8 mN / m at pH 6 and increased somewhat with increasing pH to about 9 mN/m at pH 10. The authors argue that both the long-range attraction and the adhesion force primarily are due to COO[sup [minus]]-Ca[sup 2+]-[sup [minus]]OOC bridges between the opposing surfaces and possibly charge correlation effects. It was found that calcium ions bind to the PAA and to the mica surface, whereby the electrostatic repulsion between the polyelectrolyte and the surface is lowered. The authors suggest that this is the main reason why calcium ions promote the adsorption of PAA onto negatively charged minerals. However, it also seems likely that calcium ions increase the attractive interactions between the surface and the PAA segments.},
doi = {10.1006/jcis.1993.1457},
url = {https://www.osti.gov/biblio/5846469}, journal = {Journal of Colloid and Interface Science; (United States)},
issn = {0021-9797},
number = ,
volume = 161:1,
place = {United States},
year = {1993},
month = {11}
}