New magnetic materials based on cobalt and iron-containing nanoparicles

Yurkov, G. Yu.; Баранов, Д. А.; Dotsenko, I. P.; Губин, С. П.

doi:10.1016/j.compositesb.2006.02.007

Cited by 25 publications

(13 citation statements)

References 20 publications

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“…in high-density magnetic recording devices or magnetic sensors [1]. The unique properties of nanoparticles are determined primarily by the fact that most of the atoms in the particle belong to its surface [2]. In addition, crystallinity, size distribution, shape of particles and proximity of neighbouring particles affect the response of material when a magnetic field is applied to it [3].…”

Section: Introductionmentioning

confidence: 99%

Nanocomposites of magnetic cobalt nanoparticles and cellulose

et al. 2008

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Abstract. Polymeric matrices with stabilized metallic nanoparticles constitute an important class of nanostructured materials, because polymer technology allows fabrication of components with various electronic, magnetic and mechanical properties. The porous cellulose matrix has been shown to be a useful support material for platinum, palladium, silver, copper and nickel nanoparticles. In the present study, nanosized cobalt particles with enhanced magnetic properties were made by chemical reduction within a microcrystalline cellulose (MCC) matrix. Two different chemical reducers, NaBH4 and NaH2PO2, were used, and the so-formed nanoparticles were characterized with X-ray absorption spectroscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. These experimental techniques were used to gain insight into the effect of different synthesis routes on structural properties of the nanoparticles. Magnetic properties of the nanoparticles were studied using a vibrating sample magnetometer. Particles made via the NaBH4 reduction were amorphous Co-B or Co oxide composites with diminished ferromagnetic behaviour and particles made via the NaH2PO2 reduction were well-ordered ferromagnetic hcp cobalt nanocrystals.

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Section: Introductionmentioning

confidence: 99%

Nanocomposites of magnetic cobalt nanoparticles and cellulose

et al. 2008

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“…Without stabilization they fuse together, losing their special shape and properties. Activated elemental metals in nano-forms are extensively reviewed; [11] they can be divided into active metal nanopowders [12], nanowires [13,14], nanolines [15], nanodumbbells [16], nanoclusters [17][18][19], nanosheets [20], nanorods [21][22][23], nanoalloy [24,25], nanobelts [26], and nanofilms [27], which have a host of applications, shown below, in particular as catalysts [28][29][30][31], magnetic materials *Address correspondence to this author at the Universidad Autónoma de Nuevo León, Monterrey, México; E-mail: bkhariss@mail.ru [32], nanocomposites [33,34], chemical sensors, [35][36][37] degradation of toxic chemicals [38], or even as possible carriers of isotopes for medical applications [39]. The present short review is dedicated to recent achievements in their obtaining and main applications in various areas of chemistry and chemical technology.…”

Section: Types Of Activated Metalsmentioning

confidence: 99%

Synthetic Techniques and Applications of Activated Nanostructurized Metals: Highlights up to 2008

Kharissova

Kharisov²

2008

NANOTEC

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Main methods for current production of metallic nanoparticles in different forms are reviewed. Metal nanoparticles are generally synthesized in form of nanopowders, nanowires, nanoclusters, nanorods, nanobelts, and nanofilms. Bi- and trimetallic clusters and alloys are also of an interest. Examined techniques for obtaining metal nanoparticles include chemical vapor and electrochemical deposition, use of gamma-, X-ray, laser and UV-irradiation, ultrasonic and microwave treatment, electron- and ion-beams, arc discharge, decomposition and reduction of metal salts and complexes, and biosynthesis. A special attention is paid to Rieke and supported metals.

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“…The use of a protective layer of a petrochemical‐based plastic such as PE, polypropylene, and poly(tetrafluoroethylene) is a good option, depending on the choice of the application. These polymers are thermally stable, chemically inert and have exceptional rheological and processing properties; their high dielectric strength makes them suitable for the fabrication of complex shapes and large parts .…”

Section: Introductionmentioning

confidence: 99%

Polyethylene Nanocomposites with Ni, Co, and Fe Carbon‐Based Magnetic Fillers

Nisar

Thue

Heck

et al. 2020

Polymer Engineering & Sci

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In the present study, the effect of Ni, Co, and Fe carbonbased magnetic fillers (Ni-C, Co-C, and Fe-C) was investigated on the magnetic, mechanical, thermal, and morphological properties of polyethylene nanocomposites. The in situ polymerization technique was used to prepare nanocomposites of polyethylene from the ethylene monomer introducing small amounts of filler ranging from 1 to 2 wt.%. The metal-carbonized fillers were obtained by pyrolysis of wood sawdust activated by Ni, Co, or Fe salts. X-ray diffraction showed that the fillers were of nanometric size. Thermogravimetric analysis was executed to investigate the thermal strength of the materials as well as to calculate the metal content in the carbon-based fillers. The onset degradation temperature showed an enhancement of 17 C, whereas the maximum degradation temperatures increased 4 C with the introduction of the filler. Differential scanning calorimetry indicated an improvement of 3 C in crystallization temperature, whereas the melting temperature remained unchanged compared to neat polyethylene. The filler was shown to increase the modulus of elasticity of the nanocomposites. The addition of 1.0 wt.% of the metal-carbonized material in the diamagnetic polymer matrix resulted in a thermoplastic nanocomposite with ferromagnetic behavior. POLYM. ENG. SCI., 60:988-995, 2020. 989 e C.A. = catalytic activity [kgPE [Zr] −1 h −1 bar −1 ]. f X c = degree of crystallinity calculated from the DSC curve.

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New magnetic materials based on cobalt and iron-containing nanoparicles

Cited by 25 publications

References 20 publications

Nanocomposites of magnetic cobalt nanoparticles and cellulose

Nanocomposites of magnetic cobalt nanoparticles and cellulose

Synthetic Techniques and Applications of Activated Nanostructurized Metals: Highlights up to 2008

Polyethylene Nanocomposites with Ni, Co, and Fe Carbon‐Based Magnetic Fillers

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