Spinel‐Structured Nanoparticles for Magnetic and Mechanical Applications

Baqiya, Malik Anjelh; Taufiq, Ahmad; Sunaryono, Sunaryono; Ayun, Khuroti; Zainuri, Mochamad; Pratapa, Suminar; Triwikantoro, T.; Darminto, Darminto

doi:10.5772/66293

Cited by 4 publications

(1 citation statement)

References 69 publications

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“…Fe 3 O 4 ferrofluids or magnetic colloids are composed of single-domain magnetite particles dispersing in an appropriate liquid carrier [25]. Previous papers showed that ferrofluids tend to be unstable fluids due to agglomeration phenomena [26][27][28].…”

Section: Introduction mentioning

confidence: 99%

Nanostructure and Magnetic Field Ordering in Aqueous Fe3O4 Ferrofluids: A Small-Angle Neutron Scattering Study

et al. 2019

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Despite the importance of reducing production costs, investigating the hierarchical nanostructure and magnetic field ordering of Fe 3 O 4 ferrofluids is also important to improve its application performance. Therefore, we proposed an inexpensive synthesis method in producing the Fe 3 O 4 ferrofluids and investigated their detailed nanostructure as the effect of liquid carrier composition as well as their magnetic field ordering. In the present work, the Fe 3 O 4 ferrofluids were successfully prepared through a coprecipitation route using a central precursor of natural Fe 3 O 4 from iron sand. The nanostructural behaviors of the Fe 3 O 4 ferrofluids, as the effects of the dilution of the Fe 3 O 4 particles with H 2 O as a carrier liquid, were examined using a small-angle neutron spectrometer (SANS). The Fe 3 O 4 nanopowders were also prepared for comparison. A single lognormal spherical distribution and a mass fractal model were applied to fit the neutron scattering data of the Fe 3 O 4 ferrofluids. The increasing carrier liquid composition of the fluids during dilution process was able to reduce the fractal dimension and led to a shorter length of aggregation chains. However, it did not change the size of the primary particles or building block (approximately 3.8 nm) of the Fe 3 O 4 particles. The neutron scattering of the Fe 3 O 4 ferrofluids under an external magnetic field in the range of 0 to 1 T exhibited in a standard way of anisotropic phenomenon originating from the nanostructural ordering of the Fe 3 O 4 particles. On the other hand, the Fe 3 O 4 powders did not show anisotropic scattering under an external field in the same range. Furthermore, the magnetization curve of the Fe 3 O 4 ferrofluids and nanopowders exhibited a proper superparamagnetic character at room temperature with the respective saturation magnetization of 4.4 emu/g and 34.7 emu/g.

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Section: Introduction mentioning

confidence: 99%

Nanostructure and Magnetic Field Ordering in Aqueous Fe3O4 Ferrofluids: A Small-Angle Neutron Scattering Study

et al. 2019

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Structure and magnetic properties of silica-coated magnetite-nanoparticle composites

Husain¹,

Hariyanto²,

Sulthonul³

et al. 2019

Mater. Res. Express

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Studies on Nanostructure and Magnetic Behaviors of Mn-Doped Black Iron Oxide Magnetic Fluids Synthesized from Iron Sand

Taufiq

Sunaryono

Hidayat

et al. 2017

NANO

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Manganese (Mn)-doped black iron oxide (Fe3O4) magnetic fluids in the system of MnxFe[Formula: see text]O4 were successfully synthesized from natural magnetite (iron sand) by using co-precipitation method at room temperature. The analyses of the small angle neutron scattering (SANS) data by applying a log-normal sphere with a mass fractal models for [Formula: see text] and [Formula: see text] and two log-normal spheres with a single mass fractal models for [Formula: see text], 0.75 and 1 revealed that the primary particles of the MnxFe[Formula: see text]O4 fluids tended to decrease from 3.8[Formula: see text]nm to 1.5[Formula: see text]nm along with the increasing fraction of Mn contents. The fractal dimension ([Formula: see text]) increased from about 1.2 to 2.7 as the Mn contents were increasing; which physically represents an aggregation of the MnxFe[Formula: see text]O4 particles in the fluids growing up from 1 to 3 dimensions to consolidate a more compact structure. The magnetization curves of the fluids exhibited an increasing saturation magnetization from [Formula: see text] to [Formula: see text], and a decreasing on [Formula: see text] and 0.75, with the maximum achievement of [Formula: see text]. These phenomena may probably be due to the combined effects, arising from cationic and dopant distributions, aggregation and its size, and also fractal dimension. Furthermore, the decrease of blocking temperature of the MnxFe[Formula: see text]O4 magnetic fluids could be associated with the reduced particle sizes, while the freezing temperature had its highest peak intensity when it collectively occurred with the blocking temperature at a similar point of about 270[Formula: see text]K.

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Spinel‐Structured Nanoparticles for Magnetic and Mechanical Applications

Cited by 4 publications

References 69 publications

Nanostructure and Magnetic Field Ordering in Aqueous Fe3O4 Ferrofluids: A Small-Angle Neutron Scattering Study

Nanostructure and Magnetic Field Ordering in Aqueous Fe3O4 Ferrofluids: A Small-Angle Neutron Scattering Study

Structure and magnetic properties of silica-coated magnetite-nanoparticle composites

Studies on Nanostructure and Magnetic Behaviors of Mn-Doped Black Iron Oxide Magnetic Fluids Synthesized from Iron Sand

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