Force interactions between magnetite, silica, and bentonite studied with atomic force microscopy

Dobryden, Illia; Potapova, Elisaveta; Holmgren, Allan; Weber, Hans; Hedlund, Jonas; Almqvist, Nils

doi:10.1007/s00269-014-0722-9

Cited by 10 publications

(5 citation statements)

References 20 publications

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“…The silica particles had a smaller zeta potential (−66.5 eV, pH 6.63) than the cellulose microspheres and showed the same trends as reported . The zeta potential measured in Milli-Q water for silica particles is 39.5 eV, which agrees with the literature . Although SCM and PCM were modified with negatively charged sulfate and phosphate groups, they had a lower absolute value of zeta potentials than did CM.…”

Section: Resultssupporting

confidence: 85%

“…40 The zeta potential measured in Milli-Q water for silica particles is 39.5 eV, which agrees with the literature. 41 Although SCM and PCM were modified with negatively charged sulfate and phosphate groups, they had a lower absolute value of zeta potentials than did CM. This is due to the adsorption of Ag(I) ions onto the negatively charged ligands of the cellulose surface.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Adsorption Behavior of Cellulose and Its Derivatives toward Ag(I) in Aqueous Medium: An AFM, Spectroscopic, and DFT Study

Zhu¹,

Dobryden²,

Rydén³

et al. 2015

Langmuir

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The aim of this study was to develop a fundamental understanding of the adsorption behavior of metal ions on cellulose surfaces using experimental techniques supported by computational modeling, taking Ag(I) as an example. Force interactions among three types of cellulose microspheres (native cellulose and its derivatives with sulfate and phosphate groups) and the silica surface in AgNO3 solution were studied with atomic force microscopy (AFM) using the colloidal probe technique. The adhesion force between phosphate cellulose microspheres (PCM) and the silica surface in the aqueous AgNO3 medium increased significantly with increasing pH while the adhesion force slightly decreased for sulfate cellulose microspheres (SCM), and no clear adhesion force was observed for native cellulose microspheres (CM). The stronger adhesion enhancement for the PCM system is mainly attributed to the electrostatic attraction between Ag(I) and the negative silica surface. The observed force trends were in good agreement with the measured zeta potentials. The scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) analyses confirmed the presence of silver on the surface of cellulose microspheres after adsorption. This study showed that PCM with a high content of phosphate groups exhibited a larger amount of adsorbed Ag(I) than CM and SCM and possible clustering of Ag(I) to nanoparticles. The presence of the phosphate group and a wavenumber shift of the P-OH vibration caused by the adsorption of silver ions on the phosphate groups were further confirmed with computational studies using density functional theory (DFT), which gives support to the above findings regarding the adsorption and clustering of Ag(I) on the cellulose surface decorated with phosphate groups as well as IR spectra.

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Section: Resultssupporting

confidence: 85%

Section: ■ Results and Discussionmentioning

confidence: 99%

Adsorption Behavior of Cellulose and Its Derivatives toward Ag(I) in Aqueous Medium: An AFM, Spectroscopic, and DFT Study

Zhu¹,

Dobryden²,

Rydén³

et al. 2015

Langmuir

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“…It was demonstrated that such model worked well in describing the interaction at separation distances equal or greater than 1.2 nm and 2.5 nm [12]. In another investigation at our laboratories, forces between synthetic magnetite and bentonite as well as silica probes were measured at pH 4, 6, and 8 with a working solution containing 1 mM CaCl 2 (ionic strength 10 mM by means of NaCl) [5]. However, it became clear that a higher concentration of the divalent cation was necessary, as well as shorter steps between pH values, in order to get a clearer understanding of the interaction between silica and magnetite particles.…”

Section: Introductionmentioning

confidence: 93%

“…The measurement of force interactions between particles in predefined conditions was shown to significantly contribute to particle dispersion and adhesion studies [2,3]. Knowledge about the forces acting between particles in aqueous solutions is of fundamental importance in various applications, such as mineral processing, biomedicine, nanoelectronics, and adhesives [4][5][6][7]. Iron oxide nanoparticles have attracted significant research interest due to their superparamagnetic properties [8] and high potential to be used in biomedicine [6].…”

Section: Introductionmentioning

confidence: 99%

“…Iron oxide nanoparticles have attracted significant research interest due to their superparamagnetic properties [8] and high potential to be used in biomedicine [6]. Synthetic nanomagnetite (Fe 3 O 4 ) particles with spherical shapes and known chemical composition can also be used to model natural magnetite when natural particles cannot be used due to their larger size (smaller surface area per gram) and complex chemical composition [4,5,9]. Interaction between natural magnetite and soluble silicate is of importance for mineral processing in processes such as flotation, dispersion, and agglomeration of iron ore concentrate.…”

Section: Introductionmentioning

confidence: 99%

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Surface Forces between Nanomagnetite and Silica in Aqueous Ca2+ Solutions Studied with AFM Colloidal Probe Method

Dobryden

Mensi

Holmgren

et al. 2020

Colloids and Interfaces

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Dispersion and aggregation of nanomagnetite (Fe3O4) and silica (SiO2) particles are of high importance in various applications, such as biomedicine, nanoelectronics, drug delivery, flotation, and pelletization of iron ore. In directly probing nanomagnetite–silica interaction, atomic force microscopy (AFM) using the colloidal probe technique has proven to be a suitable tool. In this work, the interaction between nanomagnetite and silica particles was measured with AFM in aqueous Ca2+ solution at different pH levels. This study showed that the qualitative changes of the interaction forces with pH and Ca2+ concentrations were consistent with the results from zeta-potential measurements. The repulsion between nanomagnetite and silica was observed at alkaline pH and 1 mM Ca2+ concentration, but no repulsive forces were observed at 3 mM Ca2+ concentration. The interaction forces on approach were due to van der Waals and electrical double-layer forces. The good fitting of experimental data to the DLVO model and simulations supported this conclusion. However, contributions from non-DLVO forces should also be considered. It was shown that an increase of Ca2+ concentration from 1 to 3.3 mM led to a less pronounced decrease of adhesion force with increasing pH. A comparison of measured and calculated adhesion forces with a few contact mechanics models demonstrated an important impact of nanomagnetite layer nanoroughness.

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Investigation on the binding force between lignin and magnetic Fe3O4 nanoparticles with AFM

Zheng

Dong

et al. 2021

Applied Surface Science

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Force interactions between magnetite, silica, and bentonite studied with atomic force microscopy

Cited by 10 publications

References 20 publications

Adsorption Behavior of Cellulose and Its Derivatives toward Ag(I) in Aqueous Medium: An AFM, Spectroscopic, and DFT Study

Adsorption Behavior of Cellulose and Its Derivatives toward Ag(I) in Aqueous Medium: An AFM, Spectroscopic, and DFT Study

Surface Forces between Nanomagnetite and Silica in Aqueous Ca2+ Solutions Studied with AFM Colloidal Probe Method

Investigation on the binding force between lignin and magnetic Fe3O4 nanoparticles with AFM

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