The effect of SDS surfactant on the flow and zeta potential of bentonite suspensions

Güngör, Nurfer; Alemdar, Ayşe; Atici, Oya Gali̇oğlu; Ece, Işık

doi:10.1016/s0167-577x(01)00299-3

Cited by 52 publications

(13 citation statements)

References 17 publications

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“…Sonication is the most common approach, but severe sonication might reduce the lengths of the sheets. Non-covalent functionalization, such as the use of surfactants, has regularly been used to overcome filler entanglements as a result of Van der Waals forces [11][12][13]. Ion or electron beam irradiation of nanocomposites has been used to modify the morphology and properties of composites [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of surfactant and radiation treatment on the morphology and properties of PP/EG composites

et al. 2015

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The effects of surfactant and electron beam (EB) radiation treatment on the morphology and properties of polypropylene (PP)/expanded graphite (EG) composites were investigated. Surfactant treatment and sonication of EG before mixing with PP significantly influenced the morphologies of the composites, and the modification of EG with sodium dodecyl sulphate (SDS) had a strong negative influence on the electrical conductivities of these composites. The electrical percolation concentration is shifted from 5 to 6 wt% filler to about 10 wt% filler in the presence of SDS. The melting and crystallization temperatures of PP in the composites were not affected by surfactant or EB radiation treatment. There were small differences in PP crystallinity, depending on the type and combination of treatments. The filler particles acted as nucleating agents and the crystallization temperatures shifted to higher temperatures. The thermal stability of PP was significantly higher after irradiation, and improved even further for the samples containing EG, but the presence of EG had little influence on the thermal stabilities of the non-irradiated composites. For both non-irradiated and irradiated composites the maximum tensile stress and elongation at break values are lower than the neat matrix, while the tensile modulus increased significantly.

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Section: Introductionmentioning

confidence: 99%

Effect of surfactant and radiation treatment on the morphology and properties of PP/EG composites

et al. 2015

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“…XRD spectra patterns (Figure ) suggested that all acrylamide‐based hydrogels prepared with Brazilian polycationic bentonite presented composite morphologies, both in distilled water and oilfield brine. The XRD spectra of the polymer composites looked essentially the same as that obtained for the clay powder with a strong peak at 2θ around 5.9, which corresponds to a basal spacing of approximatly 15 Å and indicates that the polymer chains did not penetrate between the clay layers (there was no shifting of the X‐ray d ‐spacing), interacting only with the external surfaces of the tactoids or aggregates of tactoids …”

Section: Resultsmentioning

confidence: 62%

“…On the other hand, under alkaline pH values, polymer chains with anionically charged functional groups, such as carboxylates (COO − ) and sulfonates (SO 3 − ), strongly repel negatively charged clay particles, leading to weaker adsorption of polymer onto clay surface through hydrogen bonds . Moreover, the introduction of AMPS moieties into the polymer backbone promotes stronger steric hindrance than that of acrylate moieties, further reducing the hydrogen bonding of nonionic groups to the clay particles, and thereby improving the clay dispersion within the hydrogel network …”

Section: Resultsmentioning

confidence: 99%

Influence of polymer structure on the gelation kinetics and gel strength of acrylamide‐based copolymers, bentonite and polyethylenimine systems for conformance control of oil reservoirs

Tessarolli

Souza

Gomes

et al. 2019

J of Applied Polymer Sci

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In oil reservoirs with conformance problems, the sweep and oil recovery efficiencies tend to be low because the injected oil‐recovery drive fluids channel through high‐permeability zones and/or anomalies, leaving behind part of the displaceable oil in unswept low‐permeability zones. In these scenarios, conformance improvement treatments with crosslinked polymers can be used to plug the main paths of the reservoir, improving the overall sweep efficiency. This study aimed to investigate the influence of the polymer structure [molecular weight, acrylate, 2‐acrylamido‐2‐methylpropane sulfonic acid (AMPS), and/or N‐vinyl‐2‐pyrrolidone (NVP) moieties] on the gelation kinetics of gelling systems based on homopolymers and copolymers of acrylamide, natural bentonite and polyethylenimine for the conformance control of reservoirs with harsh conditions of temperature and salinity/hardness. The correspondence between the gelation time and gel strength obtained from bottle tests and dynamic shear tests was evaluated. Samples with higher AMPS and NVP moieties formed strong composite hydrogels (equilibrium complex modulus = 20–40 Pa) with low syneresis, and good long‐term stability (∼3–6 months) under harsh conditions (90 °C, 56,012 mg L−1 total dissolved solids and 2100 mg L−1 of divalent ions). © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47556. HIGHLIGHTS Acrylamide‐based copolymers, bentonite and polyethylenimine systems showed controllable gelation time and gel strength Addition of clay into the formulation increased the gelation time and syneresis resistance of the systems, and slightly improved the final strength of the composite hydrogels Polyacrylamide (PAM) and partially hydrolyzed polyacrylamide (PHPA) samples formed heterogeneous composite hydrogels that suffered strong syneresis and thermal degradation, precipitating during aging after approximately 2 months, independently of the initial acrylate moieties of the sample Acrylamide and 2‐acrylamide‐2‐methylpropane sulfonic acid copolymer (PAM–AMPS) and acrylamide, 2‐acrylamido‐2‐methylpropane sulfonic acid, and N‐vinyl‐2‐pyrrolidone (PAM–AMPS–NVP) samples presented higher salt tolerance and formed composite hydrogels with lower syneresis and good long‐term stability (∼3–6 months). Furthermore, samples with sulfonation degree greater than 10% improved the dispersion of clay particles within the hydrogels' structure

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“…The cross flow experiments are carried out at pH 6.5, and because of the negative charge of BSA molecules at this pH, the retention is governed by the charge–charge interaction between the membrane surface and solute particles. Bentonite is also reported to possess high values of negative zeta potential . The zeta potential of bentonite particles at different pH is presented in Figure , which shows that at neutral pH bentonite particles have very high negative surface potential (−37 mV).…”

Section: Resultsmentioning

confidence: 96%

Solubility parameter estimation and phase inversion modeling of bentonite‐doped polymeric membrane systems

Kurada

Dutta

Jana

et al. 2019

J of Applied Polymer Sci

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Effects of bentonite concentration on morphology and permeation characteristics of bentonite-doped polysulfone membranes were investigated. Solubility sphere for bentonite was constructed to estimate its solubility parameter. Thermodynamic modeling of phase inversion of this system was carried out using Flory-Huggins theory. The trade-off between thermodynamic and kinetic parameters was used to predict the membrane morphology for bentonite concentration varying from 0 to 5 wt %. The porosity of bentonitedoped membranes decreased up to 3 wt % that increased thereafter. Morphological analysis showed dense cross section with finger-like macrovoids at 3 wt % beyond which it changed to honeycomb structure with large circular voids. Permeability of 3 wt % membrane was the lowest (5.6 × 10 −12 m/Pa s) with 95% bovine serum albumin rejection. Contact angle of the membranes decreased from 83 to 66 with bentonite addition making the membrane more hydrophilic.

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The effect of SDS surfactant on the flow and zeta potential of bentonite suspensions

Cited by 52 publications

References 17 publications

Effect of surfactant and radiation treatment on the morphology and properties of PP/EG composites

Effect of surfactant and radiation treatment on the morphology and properties of PP/EG composites

Influence of polymer structure on the gelation kinetics and gel strength of acrylamide‐based copolymers, bentonite and polyethylenimine systems for conformance control of oil reservoirs

Solubility parameter estimation and phase inversion modeling of bentonite‐doped polymeric membrane systems

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