Structural characterization of aqueous magnetic fluids with nanomagnetite of different origin stabilized by sodium oleate

Nagornyi, A. V.; Shlapa, Yuliia; Авдеев, М. В.; Solopan, Sergii; Белоус, А. Г.; Shulenina, A. V.; Ivankov, Oleksandr I.; Булавин, Л. А.

doi:10.1016/j.molliq.2020.113430

Cited by 10 publications

(5 citation statements)

References 33 publications

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“…Of particular interest are magnetic-field-sensitive hydrogels (so-called ferrogels) [ 5 , 6 , 7 , 8 , 9 , 10 ], since they demonstrate rapid response to the stimulus and remote-control ability [ 11 , 12 ]. To provide magnetic-field responsiveness, magnetic particles like magnetite Fe 3 O 4 [ 13 ], maghemite γ-Fe 2 O 3 , or cobalt ferrite CoFe 2 O 4 [ 11 , 14 , 15 ] should be incorporated into the gel matrix. The resulting material combines the magnetic properties inherent to magnetic filler and the elastic properties inherent to hydrogels.…”

Section: Introductionmentioning

confidence: 99%

Remotely Self-Healable, Shapeable and pH-Sensitive Dual Cross-Linked Polysaccharide Hydrogels with Fast Response to Magnetic Field

et al. 2021

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The development of actuators with remote control is important for the construction of devices for soft robotics. The present paper describes a responsive hydrogel of nontoxic, biocompatible, and biodegradable polymer carboxymethyl hydroxypropyl guar with dynamic covalent cross-links and embedded cobalt ferrite nanoparticles. The nanoparticles significantly enhance the mechanical properties of the gel, acting as additional multifunctional non-covalent linkages between the polymer chains. High magnetization of the cobalt ferrite nanoparticles provides to the gel a strong responsiveness to the magnetic field, even at rather small content of nanoparticles. It is demonstrated that labile cross-links in the polymer matrix impart to the hydrogel the ability of self-healing and reshaping as well as a fast response to the magnetic field. In addition, the gel shows pronounced pH sensitivity due to pH-cleavable cross-links. The possibility to use the multiresponsive gel as a magnetic-field-triggered actuator is demonstrated.

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Section: Introductionmentioning

confidence: 99%

Remotely Self-Healable, Shapeable and pH-Sensitive Dual Cross-Linked Polysaccharide Hydrogels with Fast Response to Magnetic Field

et al. 2021

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“…The functional dependence is close to the lognormal law, but with somewhat weighty tails (Kotlarchyk et al, 1988). It is widely used for various systems, from micro-emulsions to magnetic nanoparticles (Nagornyi et al, 2020).…”

Section: Figurementioning

confidence: 74%

Particle-size polydispersity analysis based on the unified exponential/power-law approach to small-angle scattering

Tomchuk,

Kryshtal,

Juszyńska-Gałązka

et al. 2023

J Appl Crystallogr

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Controlling particle dispersity is of huge importance for practical applications in nanoscience and technology. The analysis of small-angle scattering of X-rays and neutrons for strongly polydisperse particulate systems is considered from the point of view of describing the type of size distribution function without applying classical regularization approaches. This article presents the development of a method for determining the polydispersity parameters of nanoobjects, based on the analysis of the ratio of various moments of the size distribution function, which are proportional to different invariants of the scattering curve. The use of the unified exponential/power-law approximation to describe small-angle scattering data makes it possible to determine the type of distribution, the average size and the spread. The possibilities of the method were tested for several hydrosols of metallic nanoparticles.

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Section: Advanced Characterizationmentioning

confidence: 99%

“…49 The same, like in the case of separate particles, analysis of the structure-factor in the SAXS/SANS curves makes it possible to conclude about the interaction of aggregates in solutions. 121,348 The inner structure of aggregates in ferrofluids is studied by SAXS/SANS in the same way like for single particles. Thus, it was demonstrated that the modified function approach in the frame of the SANS contrast variation is useful for determining the average shape of the aggregates, relative content of the surfactant in them and the presence of the surfactant shell at the particles on the outer surface of the aggregates.…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

“…Thus, it was demonstrated that the modified function approach in the frame of the SANS contrast variation is useful for determining the average shape of the aggregates, relative content of the surfactant in them and the presence of the surfactant shell at the particles on the outer surface of the aggregates. 233,[348][349][350] The additional feature is that the method resolves the free surfactant micelles which can form in doubly stabilized water-based ferrofluids with a surfactant excess.…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

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Ferrofluids and bio-ferrofluids: looking back and stepping forward

et al. 2022

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Structural characterization of aqueous magnetic fluids with nanomagnetite of different origin stabilized by sodium oleate

Cited by 10 publications

References 33 publications

Remotely Self-Healable, Shapeable and pH-Sensitive Dual Cross-Linked Polysaccharide Hydrogels with Fast Response to Magnetic Field

Remotely Self-Healable, Shapeable and pH-Sensitive Dual Cross-Linked Polysaccharide Hydrogels with Fast Response to Magnetic Field

Particle-size polydispersity analysis based on the unified exponential/power-law approach to small-angle scattering

Ferrofluids and bio-ferrofluids: looking back and stepping forward

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