Soft magnetic nanocomposites based on adaptive matrix of wormlike surfactant micelles

Молчанов, В.С.; Pletneva, Vera; Klepikov, I.A.; Razumovskaya, I. V.; Philippova, Olga E.

doi:10.1039/c8ra01014e

Cited by 18 publications

(14 citation statements)

References 59 publications

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“…In this study, the storage modulus in the presence of magnetic field showed a power dependency as G ’ ~ Φ n at whole volume fractions, where the exponent n for CI, IO, and BF was determined to be 2.2, 4.0, and 3.3, respectively. Molchanov et al was reported in the volume fraction dependence of storage modulus that there were two power-law dependences of G ’ ~ Φ 1.5 ± 0.1 at Φ < 0.01 and G ’ ~ Φ 2.1 ± 0.1 at Φ > 0.01 [22]. Similar dependencies, G ’ ~ Φ 2.5 ± 0.3 for medium fields and G ’ ~ Φ 2.2±0.4 for high fields, were observed for submicron magnetite particles suspended in silicon oil containing polyethylene at Φ < 0.05 [23].…”

Section: Resultsmentioning

confidence: 99%

Particle Size in Secondary Particle and Magnetic Response for Carrageenan Magnetic Hydrogels

Ikeda

Takahashi

Watanabe

et al. 2019

Gels

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The relation between the number of magnetic particles and the change in storage modulus induced by a magnetic field was investigated for weak hydrogels containing carbonyl iron, iron oxide, and barium ferrite particles with different diameters in primary particles while maintaining the magnetization of magnetic particles. The change in storage modulus exhibited a power dependency against the number of magnetic particles, which was nearly independent of the magnetic particles. The change in storage modulus was successfully scaled by the reduced number of magnetic particles using the diameter of secondary particles. Microphotographs revealed that iron oxide and barium ferrite particles form aggregations while carbonyl iron particles are well dispersed in carrageenan gels. The diameter of secondary particles determined by a relation between the change in storage modulus and the reduced number of magnetic particles showed similar values with those observed in microphotographs.

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Section: Resultsmentioning

confidence: 99%

Particle Size in Secondary Particle and Magnetic Response for Carrageenan Magnetic Hydrogels

Ikeda

Takahashi

Watanabe

et al. 2019

Gels

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“…Since there is no one preferential crystal plane oriented perpendicular to the rod length, the rod does not grow due to the attachment of individual atoms. Most likely, the growth process starts when small spherical or hexagonal nanocrystals (i.e., primary nanocrystals) [51] are formed, which collectively orient and move according to the external field applied [52], forming chain-like or column-like structures [53,54]. The mean diameter of the pri-mary nanocrystals is 8 nm (Figure 3C and Figure 7C), which is only slightly larger than the minimum diameter of the magnetite particles (6.5 nm) [28], which is necessary for the magnetic force to overcome the Brownian motion of the particles.…”

Section: Comparable Amounts Of Hydroxyl and Iron Ions (R = 21)mentioning

confidence: 99%

Magnetic-field-assisted synthesis of anisotropic iron oxide particles: Effect of pH

Shibaev¹,

Shvets²,

Kessel³

et al. 2020

Beilstein J. Nanotechnol.

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The synthesis of magnetite (Fe3O4) nanorods using reverse co-precipitation of Fe3+ and Fe2+ ions in the presence of a static magnetic field is reported in this work. The phase composition and crystal structure of the synthesized material were investigated using electron diffraction, Raman spectroscopy, and transmission electron microscopy. It was shown that the morphology of the reaction product strongly depends on the amount of OH− ions in the reaction mixture, varying from Fe3O4 nanorods to spherical Fe3O4 nanoparticles. Fe3O4 nanorods were examined using high-resolution transmission electron microscopy proving that they are single-crystalline and do not have any preferred crystallographic orientation along the axis of the rods. According to the data obtained a growth mechanism was proposed for the rods that consists of the dipole–dipole interaction between their building blocks (small hexagonal faceted magnetite nanocrystals), which are formed during the first step of the reaction. The study suggests a facile, green and controllable method for synthesizing anisotropic magnetic nanoparticles in the absence of stabilizers, which is important for further modification of their surfaces and/or incorporation of the nanoparticles into different media.

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“…Properties of the WLM network can be modified by nanoparticles. Until now, only spherical inorganic particles were dispersed within WLM network [14][15][16][17][18][19][20]. It was shown that these particles can significantly increase the rheological properties.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to silica nanoparticles, some functional nanoparticles were incorporated into WLM networks including pyroelectric [16] and magnetic particles [17,19,20]. Introduction of pyroelectric particles made the hydrogel sensitive to temperature variation.…”

Section: Introductionmentioning

confidence: 99%

“…Heating increased the charge on the surface of particles thereby strengthening their interaction with oppositely charged surfactant micelles and enhancing the rheological properties [16]. In their turn, magnetic particles imparted magnetoresponsive properties to WLM hydrogel [17,19,20]. The aggregation of particles into chain-like/column structures because of magnetization resulted in a solid-like behavior even in rather low magnetic fields and at small volume fraction of particles, indicating the weak restrictions imposed by the matrix on the reorganization of particles in the field, which can be due to the self-assembled structure of the micellar network [19].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Injectable ultra-soft hydrogel with natural nanoclay

Молчанов¹,

Efremova²,

Kiseleva³

et al. 2019

Nanosystems: Phys. Chem. Math.

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Soft hydrogels based on a transient network of wormlike surfactant micelles containing bentonite nanoclay tactoids as physical cross-links were developed. The network was composed of mixed micelles of nontoxic zwitterionic surfactant oleylamidopropyldimethylcarboxybetaine and an anionic surfactant sodium dodecyl sulfate. It was demonstrated that before nanoclay addition the solution has pronounced viscoelastic properties with zero-shear viscosity of 100 Pa s and plateau modulus around 7 Pa, which were attributed to the formation of an entangled micellar network. The solution demonstrated pronounced shear thinning behavior provided by the elongation of wormlike micellar chains in flow direction. Upon addition of non-exfoliated nanoclay particles, the zero-shear viscosity increases by an order of magnitude, while the useful property of shear-induced thinning is retained. Oscillation amplitude tests show that viscoelastic fluid becomes hydrogel upon addition of nanoclay, because elastic response was observed even at large stress amplitudes. This behavior was attributed to the formation of nanoclaywormlike micelles junctions. Prepared soft hydrogel is a promising candidate for injection applications, because of its self-assembled structure providing pronounced shear-thinning behavior and fast recovery of rheological properties at rest. In this nanocomposite material, nanoclay tactoids strengthen the hydrogels and can serve as reservoirs for the delivery of various substances.

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Soft magnetic nanocomposites based on adaptive matrix of wormlike surfactant micelles

Abstract: A network of wormlike surfactant micelles with embedded magnetic particles demonstrates high magnetoresponsive linear viscoelastic properties due to tunable matrix.

Cited by 18 publications

References 59 publications

Particle Size in Secondary Particle and Magnetic Response for Carrageenan Magnetic Hydrogels

Particle Size in Secondary Particle and Magnetic Response for Carrageenan Magnetic Hydrogels

Magnetic-field-assisted synthesis of anisotropic iron oxide particles: Effect of pH

Injectable ultra-soft hydrogel with natural nanoclay

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