Aggregation of silica nanoparticles and its impact on particle mobility under high-salinity conditions

Kim, Ijung; Taghavy, Amir; DiCarlo, David A.; Huh, Chun

doi:10.1016/j.petrol.2015.06.019

Cited by 67 publications

(24 citation statements)

References 36 publications

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“…For example, increasing salinity decreased the toxicity of Ag + , although the toxicity of polyvinylpyrrolidone-coated AgNPs increased. This increase in toxicity was most likely to be associated with a combination of the surface properties of nanoparticles and their reactivity within highly saline media (Kim et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…However, in contrast, the toxicity of polyvinylpyrrolidone-coated AgNPs increased {PAGE \* MERGEFORMAT} significantly with increasing salinity although the toxicity of Ag + decreased (Macken et al, 2012). To date, most of the work on the effects of salinity on NPs are carried out in natural seawater, artificial seawater and saline solutions prepared with chemicals such as NaCl and CaCl 2 (Kim et al, 2015;Yung et al, 2015). Less attention has been paid to soil salinity which has a different composition to seawater.…”

Section: Introductionmentioning

confidence: 99%

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Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity

Wang

Pan

Gadd

2019

Science of The Total Environment

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Salinity can be a significant environmental stress which can govern the fate of nanoparticles in the environment as well as other factors such as pH, natural organic matter and minerals. In this research, the effects of salinity on the behaviour of biogenic selenium nanoparticles (BioSeNPs) and consequences for elemental mercury (Hg 0 ) immobilization in soil and soil solutions were investigated. It was found that homoaggregation and sedimentation of BioSeNPs were enhanced significantly with increasing salinity. Compression of the electric double layers of BioSeNPs at high ionic strengths resulted in attractive van der Waals forces dominating and leading to enhanced aggregation. Moreover, neutralization of the surface negative charge of BioSeNPs by divalent cations and the bridging of BioSeNPs via calcium binding to surface functional groups were also associated with enhanced aggregation. Such enhanced aggregation exerted inhibition of Hg 0 immobilization in soil solutions/soils of varying salinity. These results indicate that salinity is an important environmental factor governing aggregation of BioSeNPs and therefore influencing the efficiency of Hg 0 immobilization, and possible remediation treatments, as a consequence.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity

Wang

Pan

Gadd

2019

Science of The Total Environment

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“…Therefore, 5 nm nominal diameter silica nanoparticle which was the smallest available was selected for this study. The details of the nanoparticle characterization can be found in the previous study (Kim et al, 2015). The surfactants in this study were selected on the basis of the charge type as shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Each accumulator was filled with decane and API brine with the surfactant and/or the nanoparticles, respectively. In the cases with the nanoparticles, they were added to API brine right before the test started to minimize the aggregation of the nanoparticles during the test period (Kim et al, 2015).…”

Section: Experimental Set-upmentioning

confidence: 99%

Nanoparticle-stabilized Emulsions for Improved Mobility Control for Adverse-mobility Waterflooding

Kim¹,

Worthen²,

Lotfollahi³

et al. 2017

Proceedings

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The immense nanotechnology advances in other industries provided opportunities to rapidly develop various applications of nanoparticles in the oil and gas industry. In particular, nanoparticle has shown its capability to improve the emulsion stability by generating so-called Pickering emulsion, which is expected to improve EOR processes with better conformance control. Recent studies showed a significant synergy between nanoparticles and very low concentration of surfactant, in generating highly stable emulsions. This study's focus is to exploit the synergy's benefit in employing such emulsions for improved mobility control, especially under high-salinity conditions.Hydrophilic silica nanoparticles were employed to quantify the synergy of nanoparticle and surfactant in oil-in-brine emulsion formation. The nanoparticle and/or the selected surfactant in aqueous phase and decane were co-injected into a sandpack column to generate oil-in-brine emulsions. Four different surfactants (cationic, nonionic, zwitterionic, and anionic) were examined, and the emulsion stability was analyzed using microscope and rheometer.Strong and stable emulsions were successfully generated in the combinations of either cationic or nonionic surfactant with nanoparticles, while the nanoparticles and the surfactant by themselves were unable to generate stable emulsions. The synergy was most significant with the cationic surfactant, while the anionic surfactant was least effective, indicating the electrostatic interactions with surfactant and liquid/liquid interface as a decisive factor. With the zwitterionic surfactant, the synergy effect was not as great as the cationic surfactant. The synergy was greater with the nonionic surfactant than the zwitterionic surfactant, implying that the surfactant adsorption at oil-brine interface can be increased by hydrogen bonding between surfactant and nanoparticle when the electrostatic repulsion is no longer effective.In generating highly stable emulsions for improved control for adverse-mobility waterflooding in harsh-condition reservoirs, we show a procedure to find the optimum choice of surfactant and its concentration to effectively and efficiently generate the nanoparticle-stabilized emulsion exploiting their synergy. The findings in this study propose a way to maximize the beneficial use of nanoparticlestabilized emulsions for EOR at minimum cost for nanoparticle and surfactant.

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“…Comparing the DP9711 and PEG emulsions, the median droplet sizes for the PEG emulsions are smaller for all ranges of salinity. This may imply the relationship that as the effective nanoparticle size decreases the emulsion droplet size decreases as well (Kim et al, 2015). Recall that the PEG-coated silica nanoparticle dispersions had roughly half the effective particle size of the DP9711 dispersions for each salinity.…”

Section: Spe-179640-msmentioning

confidence: 98%

Nanoparticle-Stabilized Natural Gas Liquid-in-Water Emulsions for Residual Oil Recovery

et al. 2016

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Interest in silica nanoparticle-stabilized emulsions, especially those employing low-cost natural gas liquids (NGLs), has increased due to recent developments suggesting their use leads to improved conformance control and increased sweep efficiencies. When compared to conventional emulsionstabilizing materials such as surfactants, nanoparticles are an inexpensive and robust alternative, offering stability over a wider range of temperature and salinity, while reducing environmental impact.Oil-in-water emulsions with an aqueous nanoparticle phase and either a pentane or butane oil phase at a 1:1 volume ratio were generated at varying salinities for the observations of several emulsion characteristics. The effects of salinity on the stability of silica nanoparticle dispersions and NGL emulsions were observed. Increasing the salinity of the aqueous nanoparticle phase resulted in an increase in effective nanoparticle size due to increased nanoparticle aggregation. Rheology tests and estimates of emulsion droplet sizes were performed. Shear-thinning behavior was observed for all emulsions. Furthermore, overall emulsion viscosity increased with salinity. Nanoparticle-stabilized liquid butane-inwater emulsions were also generated with varying brine concentrations; however, no rheology or droplet size measurements were made due to the volatility of these emulsions.Residual oil recovery coreflood experiments were conducted (using Boise Sandstone cores) with nanoparticle-stabilized pentane-in-water emulsions as injectant and light mineral oil as residual oil. A recovery of up to 82% residual oil was observed for these experiments. By continuously measuring the pressure drop across the core, a possible mechanism for enhanced oil recovery is proposed. Pentane emulsion coreflood tests indicated that at a slower injection rate, residual oil recovery increases. This contrasts viscous emulsion corefloods (mineral oil or Texaco white oil as the emulsion oil phase), where increasing the injection rate increases the residual oil recovery.

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Aggregation of silica nanoparticles and its impact on particle mobility under high-salinity conditions

Cited by 67 publications

References 36 publications

Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity

Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity

Nanoparticle-stabilized Emulsions for Improved Mobility Control for Adverse-mobility Waterflooding

Nanoparticle-Stabilized Natural Gas Liquid-in-Water Emulsions for Residual Oil Recovery

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