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Understanding the Surface Properties and Rheology of Silica Suspension Mediated by Comb-type Poly (Acrylic Acid)/Poly (Ethylene Oxide) (PAA/PEO) Copolymer: Effect of Salinity

Abstract

Understanding the surface properties and rheology of colloidal suspensions in the presence of polymer additives with high salinity is of great importance in formulating construction materials, and optimizing process conditions in mining and petroleum industry. In this work, the surface properties and rheology of model spherical silica aqueous suspension mediated by a comb-type poly(acrylic acid)/poly(ethylene oxide) (PAA/PEO) copolymer at various salt concentrations have been investigated. Adsorption measurements using Quartz Crystal Microbalance with Dissipation monitoring (QCM-D) align well with zeta potential tests, and show that polymer adsorption on silica surfaces is enhanced at higher salinity condition (i.e., 3 M NaCl) than the lower salinity case (i.e., 1 mM NaCl) due to the suppression of electrical double layer. Surface Forces Apparatus (SFA) measurements reveal that for interactions between two mica surfaces (the basal plane of which has similar structure as silica) at high polymer concentration (e.g., 2 wt %) steric repulsion dominates in 1 mM NaCl while bridging attraction is observed in 3 M NaCl. Surface force measurements agree with rheological results on silica suspension with 0.5 to 2 wt % of PAA/PEO addition, which show significant decrease on yield stress in 1 mM NaCl due to steric repulsion but insignificant variation on yield stress in 3 M NaCl due to attractive bridging interactions. This work provides useful information regarding the surface properties and rheological properties of comb-type polymer mediated silica suspensions under different salinity, with implications on designing and processing complex colloidal suspensions with polymer additives for various applications.

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Publication details

The article was received on 26 Mar 2018, accepted on 12 May 2018 and first published on 14 May 2018


Article type: Paper
DOI: 10.1039/C8SM00623G
Citation: Soft Matter, 2018, Accepted Manuscript
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    Understanding the Surface Properties and Rheology of Silica Suspension Mediated by Comb-type Poly (Acrylic Acid)/Poly (Ethylene Oxide) (PAA/PEO) Copolymer: Effect of Salinity

    D. Yang, B. Yan, X. Li, H. Xu, X. Wang and H. Zeng, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM00623G

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