Magnetic sedimentation and aggregation of Fe3O4@SiO2 nanoparticles in water medium

Bakhteeva, Yu. A.; Медведева, И. В.; Уймин, М. А.; Бызов, И. В.; Zhakov, S. V.; Yermakov, A. Ye.; Щеголева, Н. Н.

doi:10.1016/j.seppur.2015.12.043

Cited by 29 publications

(14 citation statements)

References 38 publications

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“…A similar phenomenon was also reported elsewhere when SPN was coated with SiO 2 . 39 It is also argued that polymeric steric stabilization could also contribute to the stabilization of core− shell SPN@PAM and SPN-PAM colloidal systems. 40 Mobility Ratio of Nanofluids.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Surface-Functionalized Superparamagnetic Nanoparticles (SPNs) for Enhanced Oil Recovery: Effects of Surface Modifiers and Their Architectures

et al. 2019

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Superparamagnetic nanoparticles (SPNs) have been considered as one of the most studied nanomaterials for subsurface applications, including in enhanced oil recovery (EOR), due to their unique physicochemical properties. However, a comprehensive understanding of the effect of surface functionalization on the ability of the nanoparticles to improve secondary and tertiary oil recoveries remains unclear. Therefore, investigations on the application of bare and surface-functionalized SPNs in EOR using a sand pack were carried out in this study. Here, the as-prepared SPNs were functionalized using oleic acid (OA) and polyacrylamide (PAM) to obtain several types of nanostructure architectures such as OA-SPN, core–shell SPN@PAM, and SPN-PAM. Based on the result, it is found that both the viscosity and mobility of the nanofluids were significantly affected by not only the concentration of the nanoparticles but also the type and architecture of the surface modifier, which dictated particle hydrophilicity. According to the sand pack tests, the nanofluid containing SPN-PAM was able to recover as much as 19.28% of additional oil in a relatively low concentration (0.9% w/v). The high oil recovery enhancement was presumably due to the ability of suspended SPN-PAM to act as a mobility control and wettability alteration agent and facilitate the formation of a Pickering emulsion and disjoining pressure.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Surface-Functionalized Superparamagnetic Nanoparticles (SPNs) for Enhanced Oil Recovery: Effects of Surface Modifiers and Their Architectures

et al. 2019

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“…The increased K m value could be explained by the changes in the conformation of the active sites that resulted from the increase in the magnetic field intensity. Moreover, the MIC would be subjected to the superimposition of the induced and external magnetic fields, which would enhance the interactions between particles and lead to the magnetic agglomeration, with an increase in the K m …”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the MIC would be subjected to the superimposition of the induced and external magnetic fields, which would enhance the interactions between particles and lead to the magnetic agglomeration, with an increase in the K m . 40 3.3. Reaction Rate of the MIC-Catalyzed Reaction in the MTFBR with High Substrate Concentrations (5 < C s < 20 mg/mL).…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Comparing Immobilized Cellulase Activity in a Magnetic Three-Phase Fluidized Bed Reactor under Three Types of Magnetic Field

Cui

Kou

et al. 2018

Ind. Eng. Chem. Res.

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A novel, magnetic three-phase fluidized bed reactor (MTFBR) was designed with magnetic immobilized cellulase (MIC) as the biocatalyst for preparing chitooligosaccharides from chitosan. The MIC showed higher enzyme activity in a pulse magnetic field (PMF) than that in a steady magnetic field (SMF) or alternating magnetic field (AMF) under certain operating parameters. The application of a magnetic field increased the maximum reaction rate (V max ) and Michaelis constant (K m ), and the reaction rates of the MIC-catalyzed reaction in PMF and SMF at high concentration of chitosan solution (C s , 5 < C s < 20 mg/mL) increased as the intensity of the magnetic field increased. The concentrations of chitosan pentamer and hexamer produced were higher in the PMF than in the SMF and AMF, and the application of a magnetic field greatly reduced (by as much as 37.5%) the biocatalytic reaction time required to reach the maximum concentration of the desired chitooligosaccharides. These results suggest that the customized MTFBR supplemented with MIC is a reusable and effective piece of biocatalytic equipment, indicating that it has potential applications for large industrial-scale chitooligosaccharide syntheses.

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“…SiO 2 coated manganite nanoparticles-Fe 3 O 4 -SiO 2 (MNPs) were synthesized as described in [36]. The titanium oxide nanoparticles (TNPs) were supplied by Degussa (grade P25) [37].…”

Section: Suspension Characterizationmentioning

confidence: 99%

Simultaneous spectrophotometric determination of titanium oxide and iron oxide nanoparticles in water by using PLS algorithm

et al. 2019

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The method for determination of the component partial concentrations in mixed two-component water suspension from the UV spectrophotometry by applying the PLS algorithm is suggested. This quantitative method does not require special probe preparations, it is convenient and inexpensive and it can be realized for water quality monitoring by using portable devices. As an example, the water suspensions of TiO 2 and Fe 3 O 4 -coated by SiO 2 nanoparticles were analyzed. The concentration range for the simultaneous determination of nanoparticles is 0.5-10 mg/l. The relative standard errors for single components determination are 1.8% for TiO 2 and 3.9% for Fe 3 O 4 -coated by SiO 2 . The processes of nanoparticles aggregation in the studied mixed suspensions are reversible and do not distort significantly the results of the partial concentrations determination. The method suggested can be used for detection of the residual partial concentrations of titanium oxides and iron-containing nanoparticles in water treatment technologies.

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Magnetic sedimentation and aggregation of Fe3O4@SiO2 nanoparticles in water medium

Cited by 29 publications

References 38 publications

Surface-Functionalized Superparamagnetic Nanoparticles (SPNs) for Enhanced Oil Recovery: Effects of Surface Modifiers and Their Architectures

Surface-Functionalized Superparamagnetic Nanoparticles (SPNs) for Enhanced Oil Recovery: Effects of Surface Modifiers and Their Architectures

Comparing Immobilized Cellulase Activity in a Magnetic Three-Phase Fluidized Bed Reactor under Three Types of Magnetic Field

Simultaneous spectrophotometric determination of titanium oxide and iron oxide nanoparticles in water by using PLS algorithm

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