Hofmeister effects in the gelling of silica nanoparticles in mixed salt solutions

Sögaard, Christian; Kolman, Krzysztof; Christensson, Max; Otyakmaz, Ayşe Birsen; Abbas, Zareen

doi:10.1016/j.colsurfa.2020.125872

Cited by 14 publications

(7 citation statements)

References 48 publications

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“…We interpret this to the loss of water molecules surrounding Na + ions while traversing from solvent to the surface of silica. 36 Similar effect has been observed fo ¨r cuboid silica and results are shown in Fig. S4 of ESI.…”

Section: Dynamic Properties Of Watersupporting

confidence: 78%

The influence of silica nanoparticle geometry on the interfacial interactions of organic molecules: a molecular dynamics study

Rama

Abbas

2022

Phys. Chem. Chem. Phys.

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Section: Dynamic Properties Of Watersupporting

confidence: 78%

The influence of silica nanoparticle geometry on the interfacial interactions of organic molecules: a molecular dynamics study

Rama

Abbas

2022

Phys. Chem. Chem. Phys.

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“…When the concentration of divalent salt ions increased to 10,000 mg/L, the storage modulus of the gel decreased to about 3200 Pa. This indicated that the concentration of heavy metal ions in inorganic salts affected the extension of the gel molecular chain and reduced the storage modulus of the shear thixotropic polymer gel, thus weakening its elasticity [61]. In the whole range, the storage modulus of the gel could be kept above 3000 Pa under the condition of different divalent salt ion concentrations, which had good mechanical properties.…”

Section: Effect Of Divalent Salt Ion Concentration On Gelationmentioning

confidence: 98%

Experimental Study on Physicochemical Properties of a Shear Thixotropic Polymer Gel for Lost Circulation Control

Yang

Bai

Sun

et al. 2022

Gels

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Polymer gel lost circulation control technology is a common and effective technique to control fractured lost circulation. The performance of a lost circulation control agent is the key to the success of lost circulation control techniques. In this study, rheological tests were used to study the physical and chemical properties of a shear thixotropic polymer gel system, such as anti-dilution, high temperature resistance and high salt resistance. The results showed that the shear thixotropic polymer gel system had the ability of anti-dilution, and the gel could be formed under a mixture of 3 times volume of heavy salt water and 3/7 volume white oil, and could keep the structure and morphology stable. Secondly, the gel formation time of shear thixotropic polymer gel system could be controlled and had good injection performance under the condition of 140 °C and different initiator concentrations. Meanwhile, the shear thixotropic polymer gel system had the ability of high temperature and high salt resistance, and the gel formation effect was good in salt water. When the scanning frequency was 4 Hz and the temperature was 140 °C, the storage modulus (G′) of the gel was 4700 Pa. The gel was dominated by elasticity and had excellent mechanical properties. By scanning electron microscope observation, it was found that the shear thixotropic polymer gel system had a stable three-dimensional reticular space skeleton under the condition of high salt, indicating that it had excellent ability to tolerate high salt. Therefore, the shear thixotropic polymer gel had high temperature and high salt resistance, dilution resistance and good shear responsiveness. It is believed that the results presented in this work are of importance for extending real-life applications of shear thixotropic polymer gel systems.

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“…Transfer. Silica sol grouting approximately satisfies transport of diluted species in porous media [11]. Assuming that only convection, molecular diffusion, and mechanical dispersion are considered and that adsorption is not considered, the basic equation of solute transport is shown in the following:…”

Section: Governing Equation For Massmentioning

confidence: 99%

“…Grouting is an effective technical way for the construction of deep tunnels in unfavorable geological conditions [5][6][7]. Due to nanoparticle size, low viscosity, high injectability, and friendly to ecological environment, silica sol grouting has been widely used in petroleum engineering, groundwater protection engineering, tunnel construction, nuclear waste storage, liquefiable soil improvement, and other geotechnical fields [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Nanosilica Sol Grouting for Deep Tunnels Based on the Multifield Coupling Mechanism

Pan

Hong²,

et al. 2021

Geofluids

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Grouting is an effective technical way for the construction of deep tunnels in unfavorable geological conditions. The fluid-solid-chemical coupling mechanism of grouting process is analyzed from the following three aspects: influence of physical properties of silica sol on permeability coefficient, dynamic changes of porosity and permeability of geotechnical media with seepage pressure, and governing equations for flow and mass transfer characteristics. A dynamically changing model for nanosilica sol grouting in deep tunnels is established, considering the changing physical properties of grout and surrounding rock. Based on the Xianglushan Tunnel of Yunnan Water Diversion Project, the temporal and spatial evolution of silica sol grout is studied. The effect characteristics of grouting pressure and initial permeability are clarified. The rationality of this model is verified by classical Newtonian fluid grouting theory. The main conclusions: with the molar concentration as the index, the grout range can be divided into the raw grout region and the transition region; with the decrease of the grouting pressure, the growth rate of the normal grouting radius and the axial grouting radius will gradually decrease; due to the mechanical dispersion and molecular diffusion, the range of the transition region will gradually increase with time. The ratio of the transition region to grouting radius fluctuates slightly with time under the initial permeability of 5 D. The fluctuation increases with the decrease of initial permeability, and the average ratio increases with the decrease of grouting pressure. This study can provide theoretical guidance for grouting design of deep tunnel engineering.

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Hofmeister effects in the gelling of silica nanoparticles in mixed salt solutions

Cited by 14 publications

References 48 publications

The influence of silica nanoparticle geometry on the interfacial interactions of organic molecules: a molecular dynamics study

The influence of silica nanoparticle geometry on the interfacial interactions of organic molecules: a molecular dynamics study

Experimental Study on Physicochemical Properties of a Shear Thixotropic Polymer Gel for Lost Circulation Control

Numerical Simulation of Nanosilica Sol Grouting for Deep Tunnels Based on the Multifield Coupling Mechanism

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