Structure, magnetic and microwave properties of FeNi invar nanoparticles obtained by electrical explosion of wire in different preparation conditions

Kurlyandskaya, G.V.; Bhagat, S. M.; Bagazeev, A. V.; Medvedev, A. I.; Ballesteros, A.; Бекетов, И. В.; Сафронов, А. П.

doi:10.1016/j.jpcs.2016.06.015

Cited by 12 publications

(7 citation statements)

References 26 publications

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Section: Charaterization Of the Precusor Fe-ni Nanoparticlesmentioning

confidence: 75%

“…Then the productivity of nanoparticles was enhanced. The Fe-Ni invar alloy nanoparticles obtained by electrical exploration of wire in flowing nitrogen showed a similar morphology with their diameters being within the 3-150 nm range [17]. The XRD patterns for the as-prepared Fe-Ni nanoparticles were shown in Figure 2a, revealing the formation of austenitic FCC (face centered cubic) structure in the Fe-Ni nanoparticles with lattice parameter of (3.5998 ± 0.0006) Å, which is smaller than the (3.6038 ± 0.0007) Å in the Fe61Ni39 master alloy.…”

Section: Charaterization Of the Precusor Fe-ni Nanoparticlesmentioning

confidence: 77%

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High Hardness Nanocrystalline Invar Alloys Prepared from Fe-Ni Nanoparticles

Choi

2018

Metals

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High-density (>98% of full density) nanocrystalline invar alloys with significantly enhanced hardness (>240 in Vicker's hardness) were prepared by sintering compacted Fe-Ni nanoparticles in hydrogen. The precursor Fe-Ni nanoparticles were synthesized by hydrogen plasma evaporation of bulk Fe 61 Ni 39 alloys. The size and the productivity of the Fe-Ni nanoparticles increased with increasing hydrogen pressure. The presence of surface oxidation of the Fe-Ni nanoparticles when exposed to air was proved by the X-ray photoelectron spectra measurements. The compacted Fe-Ni nanoparticles grew rapidly at 956 • C, while the oxide impurities were removed completely by following hydrogen at 735 • C, which was found to be optimum for the synthesis of oxide-free nanocrystalline metals with fine grain size. The typical hardness of an invar alloy prepared by melting method was around 140 HV. The significantly enhanced hardness of our nanocrystalline invar alloys was potentially important in strengthening the durability of its components in instruments and in improving its machinability when machining for a component.

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Section: Charaterization Of the Precusor Fe-ni Nanoparticlesmentioning

confidence: 75%

Section: Charaterization Of the Precusor Fe-ni Nanoparticlesmentioning

confidence: 77%

High Hardness Nanocrystalline Invar Alloys Prepared from Fe-Ni Nanoparticles

Choi

2018

Metals

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“…В самом общем виде можно сказать, что данная тенденция хорошо согласуется с особенностями фазового состава и размерами обсуждаемых наночастиц (см. описание выше) и имеющимися в современной литературе представлениями о магнитных свойствах наночастиц магнетита и маггемита данных размеров [21][22][23][24][25].…”

Section: получение магнитных наночастиц электрофизическими методами и некоторые их характеристикиunclassified

“…Особое внимание в последние годы уделялось направлению, ориентированному на механизмы магнитомеханической терапии [15][16][17][18]. Хотя наибольшее количество работ было выполнено с использованием магнитных нанодисков с магнитными вихрями, полученных на основе пленочных структур [18,19], очевидно, что магнитные нанопроволоки [20] и наночастицы с высокой магнитострикцией [21] следует рассматривать как перспективные материалы для магнитомеханической терапии.…”

Section: Introductionunclassified

Магнитные Наночастицы, Полученные Электрофизическими Методами: Фокус На Биомедицинские Приложения

Курляндская¹,

Сафронов²,

Щербинин³

et al. 2021

Физика Твердого Тела

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This work describes the possibility of fabrication of the large batches of magnetic nanoparticles using electrophysical methods of electric explosion of the wire, laser target evaporation and spark discharge. Bioapplications of nanoparticles require the production of magnetic materials in the form of stabilized aqueous suspensions or hydrogels with magnetic fillers; therefore, some details of the synthesis of these materials and their certification are discussed. The peculiarities of interaction of magnetic nanoparticles with biological systems, the problem of biocompatibility, the possibility of using ferrogel substrates for the needs of cell technologies and regenerative medicine, as well as implication of biomimetics in the development of magnetic biosensors are considered. The results of the analysis of a number of different biological experiments carried out with suspensions of various types, obtained based on the same batch of MNPs are presented. An analysis of examples of magnetic biodetection and existing theoretical approaches will make it possible to assess the prospects of this scientific direction for the creation of highly sensitive thin film sensors based on the giant magnetoimpedance effect for biomedical applications

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“…3 FeNi metallic alloys have also been tested at the nanoscale, showing high magnetization 5 and tunable compositions, 6 including that of Invar. 7,8 These materials are also useful in radiation absorbers, 9,10 catalysis, 1112,13 imaging 14 and sensors. 15 A number of nanostructured FeNi alloys have also been prepared or studied at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Alloying and Phase Transformation of Fe/FeNi Core/Alloy Nanoparticles at High Temperatures

Doane

Pathade

Slaton

et al. 2021

Preprint

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This work explores how to form and tailor the alloy composition of Fe/FexNi1-x core/alloy nanoparticles by annealing a pre-formed particle at elevated temperatures between 180 – 325 oC. This annealing allowed for a systematic FeNi alloying at a nanoparticle whose compositions and structure began as a alpha-Fe rich core, and a thin gamma-Ni rich shell, into mixed phases resembling gamma-FeNi3 and gamma-Fe3Ni2. This was possible in part by controlling surface diffusion via annealing temperature, and the enhanced diffusion at the many grain boundaries of the nanoparticle. Lattice expansion and phase change was characterized by powder X-ray diffraction (XRD), and composition was monitored by X-ray photoelectron spectroscopy (XPS). Of interest is that no phase precipitation was observed (i.e., heterostructure formation) in this system and the XRD results suggest that alloying composition or alloy gradient is uniform. This uniform alloying was considered using calculations of bulk diffusion and grain boundary diffusion for Fe and Ni self-diffusion, as well as Fe-Ni impurity diffusion is provided. In addition, alloying was further considered by calculations for Fe-Ni mixing enthalpy (Hmix) and phase segregation enthalpy (HSeg) using the Miedema model, which allowed for the consideration of alloying favorability or core-shell segregation in the alloying, respectively. Of particular interest is the formation of stable metal carbides compositions, which suggest that the typically inert organic self-assembled monolayer encapsulation can also be internalized.

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Structure, magnetic and microwave properties of FeNi invar nanoparticles obtained by electrical explosion of wire in different preparation conditions

Cited by 12 publications

References 26 publications

High Hardness Nanocrystalline Invar Alloys Prepared from Fe-Ni Nanoparticles

High Hardness Nanocrystalline Invar Alloys Prepared from Fe-Ni Nanoparticles

Магнитные Наночастицы, Полученные Электрофизическими Методами: Фокус На Биомедицинские Приложения

Alloying and Phase Transformation of Fe/FeNi Core/Alloy Nanoparticles at High Temperatures

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