Investigations of suspension stability of iron oxide nanoparticles using time-resolved UV–visible spectroscopy

Vikram, S.; Vasanthakumari, R.; Tsuzuki, Takuya; Rangarajan, Murali

doi:10.1007/s11051-016-3570-3

Cited by 5 publications

(2 citation statements)

References 56 publications

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“…The sedimentation kinetics of spherical IONPs has been actively investigated in recent years. − Most of these works focused on the roles of the particle concentration and the ionic strength of the surrounding media in influencing the aggregation kinetics of IONPs. Fundamental studies of the shape-effect on the propensity for aggregation are still lacking, even though shape anisotropy plays a very prominent role in inducing magnetic aggregation , and the sedimentation behavior of IONP nanorods .…”

Section: Introductionmentioning

confidence: 99%

Sedimentation Kinetics of Magnetic Nanoparticle Clusters: Iron Oxide Nanospheres vs Nanorods

Katiyar

Mathivanan

et al. 2020

Langmuir

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A detailed study of the sedimentation kinetics of iron oxide nanoparticle (IONP) clusters composed of nanospheres and nanorods is presented. Measurements were performed to determine the absorbance of an IONP suspension undergoing sedimentation over time by using a UV–vis spectrophotometer with simultaneous monitoring of the hydrodynamic diameter of the clusters formed with dynamic light scattering (DLS). Mathematical analysis based on Happel’s spherical and cylindrical models was conducted to reveal the relationship between the settling velocity of the IONP clusters and their packing density. For the case of IONP clusters composed of rodlike particles, two distinctive phases of sedimentation were recorded, with the occurrence of rapid sedimentation at the beginning of the process (phase I) followed by a slower settling rate (phase II). In sedimentation phase II, even though the nanorod clusters had a hydrodynamic size of >500 nm, which was much larger than that of the nanosphere clusters (∼200 nm), their settling velocity of 0.0038 mm/min was still slower than that of the nanosphere clusters. Such observations were mainly a result of the packing density differences between the formed clusters; due to the end-to-end particle interactions of nanorods, the nanorod clusters were less tightly packed and more permeable. In addition to the mathematical analysis, quartz crystal microbalance with dissipation (QCM-D) was employed to measure the “softness” of the IONP clusters formed, and this physical property can be further related to their packing density. This study illustrated that for a rapidly aggregating system, such as magnetic IONPs, not only do the particle shape and size uniformity contribute to the physical properties of the particle clusters formed but also the nature of the aggregation, either end-to-end and/or side-to-side, should be carefully considered when designing a colloidally stable IONP suspension.

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Section: Introductionmentioning

confidence: 99%

Sedimentation Kinetics of Magnetic Nanoparticle Clusters: Iron Oxide Nanospheres vs Nanorods

Katiyar

Mathivanan

et al. 2020

Langmuir

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“…Figure 1 shows the absorption spectra of the water suspensions of separate MNPs and TNPs and the spectrum of their mixture. TiO 2 and Fe 3 O 4 -SiO 2 particles strongly absorb light with wavelengths smaller than 500 nm [40,41], therefore their spectra overlap and it is impossible to extract the data for one component concentration directly. However, the application of the mathematical PLS methodology gives a possibility for such a resolution.…”

Section: Pls Calibration Proceduresmentioning

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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Recovery of Gold from Thiosulfate Leaching Solutions with Magnetic Nanoparticles

Ilankoon¹,

Aldrich²

2022

Application of Nanotechnology in Mining Processes

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Investigations of suspension stability of iron oxide nanoparticles using time-resolved UV–visible spectroscopy

Cited by 5 publications

References 56 publications

Sedimentation Kinetics of Magnetic Nanoparticle Clusters: Iron Oxide Nanospheres vs Nanorods

Sedimentation Kinetics of Magnetic Nanoparticle Clusters: Iron Oxide Nanospheres vs Nanorods

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

Recovery of Gold from Thiosulfate Leaching Solutions with Magnetic Nanoparticles

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