Journal articles: 'Magnetic Nano Composite'

1

Zhao, Bin, Qilei Wang, and Lin Jin. "Heat-resistant antiflaming and friction mechanisms in nano-Fe2O3-reinforced silicon rubber." Science and Engineering of Composite Materials 20, no. 4 (November 1, 2013): 331–35. http://dx.doi.org/10.1515/secm-2013-0026.

Full text

Abstract:

AbstractA ferric oxide (Fe2O3)/silicone rubber (SR) composite was prepared to produce a magnetic rubber with good heat-resistant and friction properties: SR and nano-Fe2O3 were used as its raw materials. The heat-resistant, antiflaming, magnetic, and mechanical properties of such composites with different proportions of nano-Fe2O3 were studied. The results showed that the Fe2O3 nanoparticles were uniformly distributed throughout the composites. The physical and mechanical properties of SR were improved when Fe2O3 nanoparticles were added. The maximum elongation and tensile strength of the composites were relatively good when the ratio of Fe2O3 was 20 phr. The heat-resistance and antiflaming properties of SR were improved by adding nano-Fe2O3, which had good combined heat resistance. The friction properties of these composites were optimal at 20 phr addition of nano-Fe2O3, which laid the foundation for further applications of this type of composite in high-temperature sealing and shock absorption environments.

APA, Harvard, Vancouver, ISO, and other styles

2

Chen, C. P., T. H. Chang, and T. F. Wang. "Synthesis of magnetic nano-composite particles." Ceramics International 28, no. 8 (January 2002): 925–30. http://dx.doi.org/10.1016/s0272-8842(02)00075-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Singh, Akanksha, Mandar Shirolkar, Mukta V. Limaye, Shubha Gokhale, Chantal Khan-Malek, and Sulabha K. Kulkarni. "A magnetic nano-composite soft polymeric membrane." Microsystem Technologies 19, no. 3 (August 12, 2012): 409–18. http://dx.doi.org/10.1007/s00542-012-1646-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Li, Jian Ling, and Decai Li. "Research on Magnetization Mechanism of Nano-Magnetic Fluid." Defect and Diffusion Forum 295-296 (January 2010): 19–26. http://dx.doi.org/10.4028/www.scientific.net/ddf.295-296.19.

Full text

Abstract:

In this paper, we first analyzed the nano-magnetic fluid composition and properties. Then we studied the characteristics of nano-magnetic fluid magnetization and magnetization mechanism. In addition, we also studied the nano-Fe3O4 magnetic particle size and surface modification effect on the magnetic properties of magnetic fluids. Nano-magnetic fluid is a new type of liquid nano-composite functional material. It also has magnetism and mobility, and therefore it has many unique properties and a wide range of applications. Nano-magnetic fluid magnetization characteristic is one of its main properties, its performance and application of magnetic fluid play a decisive role.

APA, Harvard, Vancouver, ISO, and other styles

5

Panchal, Nital R., and Rajshree B. Jotania. "Enhancement of Magnetic Properties in Co-Sr Ferrite Nano Composites Prepared by an SHS Route." Solid State Phenomena 209 (November 2013): 164–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.209.164.

Full text

Abstract:

The preparation and characterization of composite materials containing nanometer-sized constituents is currently a very active and exciting area of research at laboratories around the world. In order to improve the magnetic and electromagnetic absorption properties of magnetic materials, composite of soft/hard ferrite is required in proper composition. For high-density magnetic recording, decrease in the coercive field and simultaneously increase in saturation magnetization has attracted much attention. To achieve these properties, new modified CoFe2O4-SrFe12O19 composite ferrite nanoparticles were prepared by using an SHS route. Composites of spinel: hexaferrite were prepared in the ratio 1:0, 1:2 and 0:1. The enhancement of maximum energy product BHmax is achieved by the addition of Spinel ferrite into M-type hexaferrite particles. The exchange interactions between hard and soft magnetic phases improve the microwave absorption properties. The parameters, Hc, σs, and particle size d, can easily be controlled by changing the content of spinel ferrite in the composite with Sr-M hexaferrite.

APA, Harvard, Vancouver, ISO, and other styles

6

Arumugam, Vasanthakumar, Gyanasivan G. Redhi, and Robert M. Gengan. "Efficient Catalytic Activity of Ionic Liquid-Supported NiFe2O4 Magnetic Nanoparticle Doped Titanium Dioxide Nano-Composite." International Journal of Chemical Engineering and Applications 7, no. 6 (December 2016): 422–27. http://dx.doi.org/10.18178/ijcea.2016.7.6.618.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Liu, Maoyuan, and Lei Chen. "Research on Magnetic Property of Nd2Fe14B/α-Fe Nanocomposite Under Different Roller Speeds." Open Materials Science Journal 8, no. 1 (December 31, 2014): 127–30. http://dx.doi.org/10.2174/1874088x01408010127.

Full text

Abstract:

Nano-composite permanent magnetic material is a new type of permanent magnetic material, and it is the synthesis of soft and hard magnetic phase within the nanoscale. On the basis of exchange coupling hard magnetizing theory, nano-composite permanent magnetic material can, at the same time, have high residual magnetization intensity of soft magnetic phase and high coercivity of hard magnetic phase, which can be developed into new generation high performance permanent magnetic material. Nevertheless, magnetic energy of permanent nano-composite magnet derived from experiments differs greatly from the theoretical value, and this is mainly due to fairly great difference between the micro-structure of material and the theoretical model. In this paper, the constituent was taken as (Nd, Pr, Dy)2(Fe, Nb)14B/α-Fe, and the fusant rapid quenching method was adopted to study the impact of different roller speeds on the magnetic property. Moreover, through the result of VSM, XRD and SPM, the magnetic property, phase composition and micro structure of alloy were analyzed.

APA, Harvard, Vancouver, ISO, and other styles

8

Yan, Liang, Biao Yan, and Lei Peng. "Microstructure and Magnetic Properties of Grain Boundary Insulated Fe/Mn0.5Zn0.5Fe2O4 Soft Magnetic Composites." Materials 15, no. 5 (March 2, 2022): 1859. http://dx.doi.org/10.3390/ma15051859.

Full text

Abstract:

Mn0.5Zn0.5Fe2O4 nano-powder was coated on Fe microparticles by mechanical ball milling combined with high-temperature annealing. The effects of milling time on the particle size, phase structure and magnetic properties of core–shell powder were studied. Scanning electron microscopy (SEM), energy-dispersive spectroscopy and X-ray diffraction showed that the surface of the milled composite powder was composed of thin layers of uniform Mn0.5Zn0.5Fe2O4 insulating powder. SEM also revealed a cell structure of Fe particles, indicating that the Fe particles were well separated and isolated by the thin Mn0.5Zn0.5Fe2O4 layers. Then, Fe/Mn0.5Zn0.5Fe2O4 soft magnetic composites were prepared by spark plasma sintering. The amplitude permeability of Fe/Mn0.5Zn0.5Fe2O4 SMCs in the Fe/Mn0.5Zn0.5Fe2O4 soft magnetic composites was stable. The resistivity decreased with the increase in sintering temperature. The loss of the composite core was obviously less than that of the iron powder core. Hence, the preparation method of Mn0.5Zn0.5Fe2O4 insulating iron powder is promising for reducing core loss and improving the magnetic properties of soft magnetic composites.

APA, Harvard, Vancouver, ISO, and other styles

9

Bureš, R., M. Fáberová, and P. Kurek. "Microstructure and Mechanical Properties of Fe/MgO Micro-Nano Composite for Electrotechnical Applications." Powder Metallurgy Progress 18, no. 2 (November 1, 2018): 103–10. http://dx.doi.org/10.1515/pmp-2018-0011.

Full text

Abstract:

Abstract The composite based on the microns iron size powder and MgO nanopowder was prepared using pressing followed by conventional and microwave sintering. Microstructure of the composite was investigated to evaluate the changes induced by different sintering technology. Young’s modulus, flexural strength and hardness of composites were analyzed to investigate the mechanical properties in dependence on MgO content, as well as in dependence on the sintering method. Microstructure and mechanical properties as well as functional magnetic properties of prepared composites are discussed in the paper. The main benefit of microwave heating found within process time shortening was confirmed in the case of the microwave sintered Fe/MgO composite.

APA, Harvard, Vancouver, ISO, and other styles

10

张, 建修. "Research on Magnetic-Optical Performance of Composite Magnetic Nano-Array Films." Optoelectronics 11, no. 01 (2021): 35–44. http://dx.doi.org/10.12677/oe.2021.111005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Rao, Yang, Jireh Yue, and C. P. Wong. "Material Characterization of High Dielectric Constant Polymer–Ceramic Composite for Embedded Capacitor to RF Application." Active and Passive Electronic Components 25, no. 1 (2002): 123–29. http://dx.doi.org/10.1080/08827510211279.

Full text

Abstract:

Embedded capacitor technology can improve electrical performance and reduce assembly cost compared with traditional discrete capacitor technology. Polymer–ceramic composites have been of great interest as embedded capacitor material because they combine the processability of polymers with the desired electrical properties of ceramics. A novel nano-structure polymer–ceramic composite with very high dielectric constant (εr∼150, a new record for the highest reportedεrvalue of nano-composite) has been developed in our previous work. RF application of embedded capacitors requires that insulating material have high dielectric constant at high frequency (GHz), low leakage current, high breakdown voltage and high reliability. A set of electrical tests have been conducted in this work to characterize the properties of the in house developed novel high dielectric constant polymer–ceramic nano-composite. Results show that this material has faily high dielectric constant in the RF range, low electrical leakage and high breakdown voltage. 85/85 TH aging test has been performed and it had shown this novel high K material has good reliability. An embedded capacitor prototype with capacitance density of35 nF/cm2has been manufactured using this nano-composite with spinning coating technology. This novel nano-composite can be used for the integral capacitors in the RF applications.

APA, Harvard, Vancouver, ISO, and other styles

12

ZHOU, YUN, XINYAN WANG, LI LI, YULING SU, JINCANG ZHANG, and SHIXUN CAO. "MULTIFERROISM AND MAGNETOELECTRIC COUPLING IN NANO-MICROSCALE LEAD-FREE COMPOSITE BY 0.3Co-FERRITE AND 0.7(K0.5Na0.5)NbO3-BASED FERROELECTRIC MATRIX." International Journal of Modern Physics B 25, no. 32 (December 30, 2011): 4481–88. http://dx.doi.org/10.1142/s0217979211059115.

Full text

Abstract:

Nontoxic lead-free multiferroic composites are synthesized by incorporating the dispersed 0.3 CoFe 2 O 4 (CFO) ferromagnetic nanoparticles into 0.7( K 0.5 Na 0.5) NbO 3- LiSbO 3 (KNN-LS5.2) ferroelectric micromatrix. The multiferroicity of the composite can be verified by polarization-electric field hysteresis loop and magnetic hysteresis loop. The composite exhibits excellent magnetic properties. A dilution effect is observed in magnetic hysteresis loops. The field dependence of ME voltage coefficient is given as a function of magnetic field from -4 kOe to 4 kOe with a maximum magnetoelectric voltage coefficient of 10.7 mV ⋅ cm -1⋅ Oe -1 at the frequency of 1 kHz. It is a very high value in the lead-free magnetoelectric composites system for the potential use on multifunctional devices.

APA, Harvard, Vancouver, ISO, and other styles

13

Shen, Li-Kuo, Kang-Hsin Fan, Ting-Lin Wu, Haw-Ming Huang, Ting-Kai Leung, Chi-Jen Chen, and Wei-Jen Chang. "Fabrication and magnetic testing of a poly-L-lactide biocomposite incorporating magnetite nanoparticles." Journal of Polymer Engineering 34, no. 3 (May 1, 2014): 231–35. http://dx.doi.org/10.1515/polyeng-2013-0207.

Full text

Abstract:

Abstract Polylactic acid (PLA)-based composite has been widely used in tissue engineering. To modify the material’s properties, inorganic substances have been used to form nanoparticle-PLA composites. The aim of this study is to develop a novel magnetic biodegradable composite. Nanoscale magnetite (Fe3O4) was incorporated into a poly-L-lactide (PLLA) matrix with proportions of 0%, 5%, 10%, and 15% (w/w). Injection molding was carried out to produce the nano-magnetite-PLLA composite samples. X-ray diffraction (XRD), differential scanning calorimetry (DSC), superconducting quantum device (SQUID), and three-point bending were performed to test the physical properties of the magnetite-PLLA composite. The results showed that the magnetite-PLLA composite exhibited typical ferromagnetic hysteresis loops. The addition of nanoscale magnetite significantly increased the magnetic flux density of the PLLA composite. These results suggest that the magnetite-PLLA composite has the potential to be used for future applications in tissue engineering.

APA, Harvard, Vancouver, ISO, and other styles

14

Thakor, S. G., V. A. Rana, H. P. Vankar, and T. R. Pandit. "Dielectric spectroscopy and structural characterization of nano-filler-loaded epoxy resin." Journal of Advanced Dielectrics 11, no. 02 (April 2021): 2150011. http://dx.doi.org/10.1142/s2010135x21500119.

Full text

Abstract:

This work outlines the characterization of epoxy resin [Bisphenol A-(epichlorhydrin): epoxy] and hardener [[Formula: see text](3-dimethylaminopropyl)-1,3-propylenediamine] with various inorganic nano-fillers. Dielectric characterizations of epoxy, hardener, neat epoxy (epoxy + hardener) and nano-epoxy (nano-filler + neat epoxy) composites loaded with 1 wt.% of inorganic nano-fillers (SiO2, Al2O3, TiO2 and ZnO) were carried out using precision LCR meter, over the frequency range of 1 kHz–2 MHz at a constant temperature of 300.15 K. The structural information of nano-fillers, neat epoxy and nano-epoxy composites was understood by Fourier transform infrared spectroscopy and by XRD. Moreover, hardness and shear strength (shear punch) were also determined in order to gain additional information about the mechanical properties of epoxy composite. Influence of inorganic nano-fillers on the dielectric properties, structural chemistry and mechanical properties of neat epoxy composite is discussed thoroughly in this study.

APA, Harvard, Vancouver, ISO, and other styles

15

Chen, Jin, Hai Yan Zhang, and Li Ping Li. "The Targeting Magnetic Induction Heating of Nano-Carbon Iron Composite." Materials Science Forum 610-613 (January 2009): 1284–89. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.1284.

Full text

Abstract:

A nano-carbon and iron composite--carbon coated iron nanoparticles produced by carbon arc method can be used as a new kind of magnetic targeting and heating drug carrier for cancer therapy. It presents an special nanostructure of iron nanoparticles in inner core and nano-carbon shells outside. The nano-carbon shells have a high drug adsorption ability because of its high surface area and its inner core has great effect of targeting magnetic heating. Magnetic induction heating effect of pig liver injected mixed liquids with different concentration carbon coated iron particles in physiological saline indicates that the more quantity of nanoparticles used, the higher temperature it is. Magnetic induction heating effect of the pig liver was compared in the case of filling method and injection method (both were containing 0.3g carbon coated iron nanoparticles). The iron nanoparticle in its inner core has good effect of magnetic induction heating, the temperature can go up to 51 °C in the case that carbon coated iron nanoparticles mixed with physiological saline were distributed uniformly in pig liver. And the temperature can go up to 46°C in the case that carbon-coated iron nanoparticles was injected in a certain section of pig liver. It is obvious that injected one is much better than that of filled, but they are all enough to kill the cancer cells.

APA, Harvard, Vancouver, ISO, and other styles

16

Zhang, Wen Qiang. "Fabrication of Flaky Magnetic Composite Particles." Advanced Materials Research 490-495 (March 2012): 2628–31. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2628.

Full text

Abstract:

Diatomite coated with ɑ-Fe films were obtained by Chemical Vapor Deposition process. The resultant Fe-coated flaky diatomite particles had low densities. The results show that Fe coated diatomite flakes can be achieved, and that the coating consisted of ɑ-Fe nano-crystallite. The complex permeability and permittivity of the composites were measured in the frequency range of 1–18 GHz. The microwave absorption properties of these flaky particles are discussed. The results indicate that the flaky particles have potential to be used as a lightweight broad band microwave absorber.

APA, Harvard, Vancouver, ISO, and other styles

17

Cardwell, D. A., N. Hari Babu, and K. Iida. "Enhanced magnetic flux pinning in nano-composite (re)-ba-cu-o bulk superconductors." Nanopages 1, no. 2 (June 2006): 165–83. http://dx.doi.org/10.1556/nano.1.2006.2.3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Nagase, Takeshi, Akihiro Nino, and Yukichi Umakoshi. "Pinpoint Nano-Crystallization and Magnetization in Fe-Nd-B Metallic Glass by Electron Irradiation." Materials Science Forum 561-565 (October 2007): 1403–6. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.1403.

Full text

Abstract:

Pinpoint nano-crystallization in Fe-based metallic glass was achieved by 2.0MV electron irradiation. Circular nano-crystalline structure regions with about 1μm in diameter were formed in the metallic glass and they were well dispersed in the amorphous matrix. In Fe77.5Nd4B18.5 alloy, micrometer order hard magnetic nano-composite region was formed in non-magnetic metallic glass matrix by electron irradiation. Electron irradiation induced crystallization is very effective for obtaining superior functional metallic materials with fine magnetic domains.

APA, Harvard, Vancouver, ISO, and other styles

19

Balamurugan, N., and S. Selvaperumal. "Experimental Analysis of Performance and Thermal Capability of Three Phase Squirrel Cage Induction Motor Using Plastered Composite Conductors." Current Nanomaterials 4, no. 3 (November 11, 2019): 201–5. http://dx.doi.org/10.2174/2405461504666190912144746.

Full text

Abstract:

Background: This article deals with the analysis on improved performance and efficiency of induction motor by using nano composites for stator winding. Methods: The nanocomposites are added with different enamel. Enamel is mostly preferred for induction motors’ winding, due to three main reasons: adhesion, infusion and plaster. To predetermine the plaster and nanocomposite conductor’s behavior when they are used for transmitting AC currents and developing AC magnetic field, a numerical analysis is performed. The total heat losses are determined by the heat run test. Open circuit and short circuit tests are used to analyze the performance and efficiency of the proposed induction motor. Results: The AC losses of composite and plaster conductors having good accord are compared with previous solid and hollow conductors. Analysis of the coil by a composite and plaster conductor shows that the AC losses in low current are lower than the coil, which is wrapped by a solid, and hallow conductors. Due to this reason, composite and plaster conductors are considered advantageous for low and medium power motors. Conclusion: Adding nano composites with the plaster material will help to improve electrical, thermal and mechanical characteristics. The property of enamel can change the lifetime of induction motor. The induction motor winding makes use of nano composites SiO2 and TiO2 with enamel coated.

APA, Harvard, Vancouver, ISO, and other styles

20

Shah, Nasrullah, Tahir Zaman, Touseef Rehan, Salman Khan, Waliullah Khan, Abbas Khan, and Mazhar Ul-Islam. "Preparation and Characterization of Agar Based Magnetic Nanocomposite for Potential Biomedical Applications." Current Pharmaceutical Design 25, no. 34 (November 19, 2019): 3672–80. http://dx.doi.org/10.2174/1381612825666191011113109.

Full text

Abstract:

Purpose: The purpose of the present study was to make a biocompatible agar based composite material via incorporation of appropriate additives within the agar matrix for potential applications in drug delivery and biomedical fields. Methodology: Agar based composites were prepared by the incorporation of magnetic iron oxide nano particles, graphite and sodium aluminum as additives in different proportions within the agar matrix by a simple thermophysico- mechanical method. The as prepared agar based composites were then characterized by different techniques i.e. FTIR, SEM, TGA, XRD and EDX analyses. The FTIR peaks confirmed the presence of each component in the agar composite. SEM images showed the uniform distribution of each component in the agar composite. TGA study showed the thermal stability range of different composite sheets. XRD pattern revealed the crystallinity and EDX analysis confirmed the elemental composition of the prepared composites. The prepared agar based composites were evaluated for antimicrobial activities against three pathogenic bacterial strains Escherichia coli, Staphylococcus aureus and Klebsiella pneumonia and the result indicated efficient antimicrobial activities for all composites. Conclusions: From the overall study, it was concluded that due to the non-toxic nature, thermal stability and excellent antibacterial properties, the prepared agar based composites can receive potential biomedical applications.

APA, Harvard, Vancouver, ISO, and other styles

21

Yang, Haibin, and Zhidong Liu. "Theoretical Modeling of Composite Micro- and Nano-Fiber Devices and Electronic Information Application Research." Journal of Nanomaterials 2022 (May 6, 2022): 1–12. http://dx.doi.org/10.1155/2022/1601136.

Full text

Abstract:

With the continuous development of information science and technology, micro- and nano-fiber optic sensing technology has been widely used in the fields of medicine, communication engineering, and environmental monitoring, and fiber optic devices are widely available in the market because of their advantages such as anti-magnetic interference, corrosion resistance, light weight, high sensitivity, and transmission bandwidth. The purpose of this paper is to investigate the intrinsic correlation between micro- and nano-optical fiber devices and electronic information, introduce the fabrication process of micro- and nano-optical fiber, numerical simulations, and corresponding magnetic field experiments, explore the effects of polarization dispersion and polarization-related dissipation on the system, and enhance the sensing characteristics of micro- and nano-optical fiber through experimental design to maximize its functionality. The experimental results show that the refractive index and magnetic field exhibit a linear relationship with correlation coefficients of 0.995 and 0.994, respectively, when the external magnetic field is between 70 Oe and 300 Oe.

APA, Harvard, Vancouver, ISO, and other styles

22

Mohammadi, Ali, and Shabnam Pourmoslemi. "Enhanced photocatalytic degradation of doxycycline using a magnetic polymer-ZnO composite." Water Science and Technology 2017, no. 3 (May 31, 2018): 791–801. http://dx.doi.org/10.2166/wst.2018.237.

Full text

Abstract:

Abstract A novel magnetic polymer-ZnO composite was prepared by incorporating Fe3O4 and ZnO nano-particles in the structure of an adsorbent polymer. Precipitation polymerization was used for synthesizing the adsorbent polymer and its efficiency for extracting doxycycline from aqueous solution was optimized according to several parameters including time, pH and amount of polymer. Results showed the highest extraction efficiency at neutral pH of the doxycycline solution in 20 min, and the capacity of the polymer was about 20 mg/g. The magnetic property of a material is important for fast and facile separation of composite particles after each use. Magnetic polymer-ZnO composite was synthesized by adding Fe3O4 and ZnO nano-particles to the polymerization mixture in order to take advantage of both sorption and photocatalytic degradation mechanisms. The obtained composite was characterized using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy equipped with wavelength dispersive X-ray spectroscopy and used for enhanced photocatalytic degradation of doxycycline in aqueous solution. Results showed 76.5% degradation of doxycycline in 6 hours which was significantly higher than the degradation observed by an equivalent amount of ZnO nano-particles. Photocatalytic degradation of doxycycline fitted the pseudo first order kinetic model with a rate constant of 4 × 10−3 μg mL−1 min−1.

APA, Harvard, Vancouver, ISO, and other styles

23

Joshi, Sahira, Manobin Sharma, Anshu Kumari, Surendra Shrestha, and Bhanu Shrestha. "Arsenic Removal from Water by Adsorption onto Iron Oxide/Nano-Porous Carbon Magnetic Composite." Applied Sciences 9, no. 18 (September 7, 2019): 3732. http://dx.doi.org/10.3390/app9183732.

Full text

Abstract:

This study aimed to develop magnetic Fe3O4/sugarcane bagasse activated carbon composite for the adsorption of arsenic (III) from aqueous solutions. Activated carbon (AC) was prepared from sugarcane bagasse by chemical activation using H3PO4 as an activating agent at 400 °C. To enhance adsorption capacity for arsenic, the resultant AC was composited with Fe3O4 particles by facile one-pot hydrothermal treatment. This method involves mixing the AC with aqueous solution of iron (II) chloride tetrahydrate, polyvinyl pyrrolidone (PVP), and ethanol. Batch adsorption experiments were conducted for the adsorption of As (III) onto the composite. The effects of pH, adsorbent dosage, and contact time on the arsenic adsorption were studied. The result showed that the composite could remove the arsenic from the water far more effectively than the plain AC. The highest percentage of arsenic removal was found at pH at 8, adsorbent dose of 1.8 g/L, and contact time of 60 min. Langmuir and Freundlich adsorption isotherm was used to analyze the equilibrium experimental data. Langmuir model showed the best fit compared to the Freundlich model with a maximal capacity of 6.69 mg/g. These findings indicated that magnetic Fe3O4/sugarcane bagasse AC composite could be potentially applied for adsorptive removal of arsenic (III) from aqueous solutions.

APA, Harvard, Vancouver, ISO, and other styles

24

Koshikawa, Yusuke, Ryo Miyashita, Takuya Yonehara, Kyoka Komaba, Reiji Kumai, and Hiromasa Goto. "Conducting Polymer Metallic Emerald: Magnetic Measurements of Nanocarbons/Polyaniline and Preparation of Plastic Composites." C 8, no. 4 (November 4, 2022): 60. http://dx.doi.org/10.3390/c8040060.

Full text

Abstract:

Synthesis of polyaniline in the presence of fullerene nanotubes (nanocarbons) in water was carried out with oxidative polymerization. The surface of the sample showed metallic emerald green color in bulk like the brilliance of encrusted gemstones. The composite showed unique magnetic behavior, such as microwave power-dependent magnetic resonance as magnetic spin behavior and macroscopic paramagnetism with a maximum χ value at room temperature evaluated with superconductor interference device. Surface structure of the composite was observed with optical microscopy, circular polarized differential interference contrast optical microscopy, scanning electron microscopy, and electron probe micro analyzer. Polymer blends consisting of polyaniline, nano-carbons, and hydroxypropylcellulose or acryl resin with both conducting polymer and carbon characters were prepared, which can be applied for electrical conducting plastics. The combination of conducting polymer and nano-carbon materials can produce new electro-magneto-active soft materials by forming a composite. This paper reports evaluation of magnetic properties as a new point of nanocarbon and conducting polymer composite.

APA, Harvard, Vancouver, ISO, and other styles

25

Deraz, N. M., and Moustafa M. G. Fouda. "Fabrication and Magnetic Properties of Cobalt-Copper Nano-Composite." International Journal of Electrochemical Science 8, no. 2 (February 2013): 2682–90. http://dx.doi.org/10.1016/s1452-3981(23)14340-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Kong, Yuan Yuan, and Hao Zhou. "Formation and Magnetic Characterization of Magnesium Oxide / Iron Nano Composite Particles." Advanced Materials Research 236-238 (May 2011): 1927–30. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1927.

Full text

Abstract:

Nano-sized composite magnetic particles MgO /Fe were in-situ combustion synthesized at 620°Cfor the Mg-70.9wt%Fe3O4 system. In this paper, we discussed the reactant ratio on the influence of micro-morphology and the magnetic properties of nanoparticles. It was indentified that: Mg(29.1wt%) was the suitable reactant ratio, the sintered composite spherical particles with mean diameter 40nm distributed evenly, particles had good soft magnetic properties, and it was the future drug carriers materials.

APA, Harvard, Vancouver, ISO, and other styles

27

Nouh, El A. Said, Manas Roy, Goutam Nandi, and Sabyasachi Sarkar. "Magnetic and Electrocatalytic Properties of Nano-Pd and -Pt-Carbon Nano-Onion Composite." Advanced Science, Engineering and Medicine 5, no. 11 (November 1, 2013): 1181–87. http://dx.doi.org/10.1166/asem.2013.1409.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Shahril, Mohd Khairul, Rose Farahiyan Munawar, Muhd Hafez Mohamed, Afraha Baiti Arif, Noraiham Mohamad, Mohd Edeerozey Abd Manaf, Jeeferie Abd Razak, and Hairul Effendy Ab Maulod. "Green Magnetic Composite Sheet from Durian Shell and Nano-Magnetite Particles." Applied Mechanics and Materials 761 (May 2015): 515–19. http://dx.doi.org/10.4028/www.scientific.net/amm.761.515.

Full text

Abstract:

Biomass-derived materials such as kenaf pulp and wood chips are a perfect candidate to produce magnetic paper. Furthermore, by using biomass waste, such as paddy straw, sugarcane, bagasse and durian shell, the cost of producing magnetic paper can be further reduced while giving added value to the waste. This paper investigates the potential of producing magnetic sheet from durian shell. Initially, durian shells were dried before undergoing the pulping process. The resulted sheet was then combined with magnetic particles, the nanomagnetite using either lumen loading or in-situ co-precipitation to produce a magnetic composite sheet. After being loaded with magnetic particles, the composite sheets were tested in terms of the homogeneity of the magnetic particles in the samples, degree of loading of the magnetic particles and the magnetic properties of the samples. Results obtained show a great success in producing the magnetic sheet from durian shell waste and nanomagnetite particles. It was also found that the lumen loading method gives better magnetic properties compared to the in-situ co-precipitation method.

APA, Harvard, Vancouver, ISO, and other styles

29

Zhang, Zhan Xin, Hui Li Li, Tao Liu, and Feng Ming Wang. "The Measurement for the Effective Anisotropy Constant of the Nanocomposite Permanent Magnetic Material Nd₂Fe₁₄B/α-Fe." Advanced Materials Research 189-193 (February 2011): 292–95. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.292.

Full text

Abstract:

The effective anisotropy constant and the saturation magnetization in nano composite Nd2Fe14B/α-Fe have been calculated by the law of approach to saturation (LATS) method. The applicability of the method has been analyzed. The calculated result shows that the LATS method is suitable for the calculation of the effective anisotropy constant and the saturation magnetization in nano composite permanent magnetic materials.

APA, Harvard, Vancouver, ISO, and other styles

30

Wei, Jiaqi, Kaihua Cao, Hushan Cui, Kewen Shi, Wenlong Cai, Huisong Li, Yang Jing, Chao Zhao, and Weisheng Zhao. "All Perpendicular Spin Nano-Oscillators with Composite Free Layer." SPIN 09, no. 03 (May 8, 2019): 1940010. http://dx.doi.org/10.1142/s2010324719400101.

Full text

Abstract:

Owing to improved thermal stability and scalability, materials with perpendicular magnetic anisotropy (PMA) are extremely attractive. The all perpendicular magnetic tunnel junction ([Formula: see text]-MTJ) devices are primarily devoted to spin transfer torque (STT)-induced switching and few works report their microwave emission. Here, we demonstrate the basic results of RF function in nanoscale [Formula: see text]-MTJ which has two different thickness free layers separated by atom-thick tungsten insertion. The ultrathin W spacer layer not only enables the two CoFeB free layers precess as a single layer but also greatly enhances the PMA which further induces high-emission frequency. The all perpendicular spin transfer torque nano-oscillator (STNO) exhibited high frequency (7.6[Formula: see text]GHz) and large current modulation capability of [Formula: see text] at moderate external magnetic field. Along with our previous work on STT switching utilizing the similar stack, such a multifunctional structure could bring low cost solutions to Internet of Things (IoT) network applications.

APA, Harvard, Vancouver, ISO, and other styles

31

Guo, Min, Tong Hua Zhang, Jing Dong, and Lan Cheng. "Magnesium Ferrite Powder and its Composite Electrospinning Nano-Fiber Preparation." Advanced Materials Research 842 (November 2013): 83–86. http://dx.doi.org/10.4028/www.scientific.net/amr.842.83.

Full text

Abstract:

This paper investigates a magnetic fiber made of magnesium ferrite particle and PVA. Magnesium ferrite particles were prepared using chemical co-precipitation method and characterized by FTIR spectra, size distribution and magnetism. In addition, the morphology of magnetic fibers was studied by SEM. Results show that magnesium ferrite particles present pretty good magnetism and quite uniform size distribution. With an increasing content of magnesium ferrite particle, the volume and mass of magnetic microspheres increase on the fiber surface.

APA, Harvard, Vancouver, ISO, and other styles

32

Chen, Bao-An, Yong-Yuan Dai, Xue Mei Wang, Ren-Yun Zhang, Feng Gao, Jian Chen, Chong Gao, et al. "Synergistic Effect of Magnetic Nanopartical Fe304, Au and Daunomycin on K562/A02." Blood 110, no. 11 (November 16, 2007): 4171. http://dx.doi.org/10.1182/blood.v110.11.4171.4171.

Full text

Abstract:

Objective: This paper was to study the reversal effect of magnetic Nano-Fe3O4 or Nano-Au with DNR, on multidrug resistance cell line K562/A02 and to investigate the reversal mechanism of this combination, and to provide theoretic evidence for the clinical application of them as resistance modifying agents. Method: The IC50 (the concentration causing 50% inhibition of cell growth) of DNR, Nano-Fe3O4 and Nano-Au respectively were assayed by MTT method.The drug-loaded nanoparticles were prepared by solvent diffusion method.Some nanoparticales, volume ratio from 1.5% to 50%, were combined with some DNR to find the best combination to prepare best drug-loaded nanopartilces.At last, the K562/A02 cells was treated with the composite of 25% nanoparticales and 10mg/L DNR, which MDR1 mRNA was assayed by RT-PCR;intracellular drug concentration and the apoptosis was determined by fluorometry and confocal fluorescence microscope. Results: The IC50 of DNR for K562/A02 and K562 cells were 23.23mg/L and0.307mg/L respectively.Two nanoparticles themselves have not evident cytotoxic effect to K562/A02 and K562 cells.Pretreating K562/A02 cells with the composite of 25% nanoparticales and 10mg/L DNR for 48 hours partially restored the sensitivity of K562/A02 cells to DNR;K562/A02 showed apoptotic characteristics after treated with this composite;drug-loaded nanopartilces elevated the intracellular DNR accumulation in K562/A02 and its MDR1 mRNA were down regulated.Data was analyzed by SPSS 11.5 software and expressed as mean ± SD. Conclusions: Nano- Fe3O4 or Nano-Au can increases the intracellular free DNR concentration of the K562/A02 cells, which lead to more K562/A02 cells apoptosis. Two nanoparticles themselves could not lower the MDR1 gene expression of the K562/A02 cells, but they degraded the MDR1 gene level with combine DNR. These results suggested that Nano- Fe3O4 or Nano-Au with DNR can reverse the resistance of K562/A02 cells significantly.

APA, Harvard, Vancouver, ISO, and other styles

33

Jiang, Wei, Lida Shen, Kai Wang, Zhanwen Wang, and Zongjun Tian. "Wear resistance of Ni-Co/SiC composite coating by jet electrodeposition in the presence of magnetic field." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 234, no. 3 (September 18, 2019): 431–38. http://dx.doi.org/10.1177/0954405419875353.

Full text

Abstract:

The Ni-Co/SiC composite coatings were prepared via jet electrodeposition in the presence of magnetic field. The microstructure and texture orientation of the composite coatings were analyzed via field emission scanning electron microscopy, three-dimensional profiling, and X-ray diffraction. The microhardness and wear resistance were characterized by a microhardness tester and a friction–abrasion testing machine. The results indicated that nano-SiC particles improved the surface morphology of the Ni-Co/SiC composite coating. In jet electrodeposition, globular structure aggregation began to form protrusions in the Ni-Co/SiC composite coating due to nanoparticle agglomeration when 6 g/L of nano-SiC was added. The Ni-Co/SiC (6 g/L) composite coating became uniform and densification by jet electrodeposition in magnetic field, with higher microhardness and better wear resistance. The microhardness of the Ni-Co/SiC composite coating increased to 626 ± 14 HV, and the corresponding friction coefficient was as low as 0.317.

APA, Harvard, Vancouver, ISO, and other styles

34

Ebong, Sifon Emem, Pereware Adowei, and Gloria Ukalina Obuzor. "PHYTOSYNTHESIS AND CHARACTERIZATION OF IRON NANOCOMPOSITES BY IRVINGIA GABONENSIS (OGBONO) AQUEOUS AND ETHANOL LEAF EXTRACTS." International Journal of Research -GRANTHAALAYAH 8, no. 5 (June 10, 2020): 256–65. http://dx.doi.org/10.29121/granthaalayah.v8.i5.2020.324.

Full text

Abstract:

The need for emerging materials based on nano-composites from green plants, or non-useful materials for adsorption process is on the increase. The objective of this research was to evaluate the phytosynthesis and characterization of iron nano-composites (Fe.NCs) formed by aqueous and ethanol extracts of Irvingia gabonensis (Ogbono) tree leaves. The composites were characterized by visual observation, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Visual observation of the iron oxide nano-composites synthesized was confirmed by change in colour from yellow to brown within minutes of formation. The FTIR characterization showed that, phenolic groups were involved in the phytosynthesis of the iron nano-composites with the presence of –OH and –NH groups at 3348.54cm-1 and -C-N- group at 1635.69 cm-1 for aqueous extract and broad band of –OH and -NH stretch at 3363.97cm-1 and -C-H-stretch at 2978-2901.04cm-1 attributed to alkanes in alcohol extract. There was also –OH stretch at 2885.60cm-1 and Fe-O group at 671.25cm-1 in Fe. NCs with Fe-O stretch observed at 583.33cm-1 in I. gabonensis iron nano-composite. Cube-like structures, irregular shapes and sizes with individual, spherical particles forming aggregates and chains were revealed by the SEM micrographs, these are recognized attributes of strong magnetic properties of iron. The particle sizes are 30 and 45 nm for aqueous and alcohol extracts respectively, which could provide large surface area for contaminant adsorption. Conclusively, photosynthesis of Fe. NCs using water and ethanol extracts of I. gabonensis (Ogbono leaves) could be an effective one-step pathway for nano-composite production from eco-friendly, safe and less toxic green plant material.

APA, Harvard, Vancouver, ISO, and other styles

35

Perecin, Caio José, Xavier Pierre Marie Gratens, Valmir Antônio Chitta, Patrícia Leo, Adriano Marim de Oliveira, Sérgio Akinobu Yoshioka, and Natália Neto Pereira Cerize. "Synthesis and Characterization of Magnetic Composite Theragnostics by Nano Spray Drying." Materials 15, no. 5 (February 25, 2022): 1755. http://dx.doi.org/10.3390/ma15051755.

Full text

Abstract:

Composites of magnetite nanoparticles encapsulated with polymers attract interest for many applications, especially as theragnostic agents for magnetic hyperthermia, drug delivery, and magnetic resonance imaging. In this work, magnetite nanoparticles were synthesized by coprecipitation and encapsulated with different polymers (Eudragit S100, Pluronic F68, Maltodextrin, and surfactants) by nano spray drying technique, which can produce powders of nanoparticles from solutions or suspensions. Transmission and scanning electron microscopy images showed that the bare magnetite nanoparticles have 10.5 nm, and after encapsulation, the particles have approximately 1 μm, with size and shape depending on the material’s composition. The values of magnetic saturation by SQUID magnetometry and mass residues by thermogravimetric analysis were used to characterize the magnetic content in the materials, related to their magnetite/polymer ratios. Zero-field-cooling and field-cooling (ZFC/FC) measurements showed how blocking temperatures of the powders of the composites are lower than that of bare magnetite, possibly due to lower magnetic coupling, being an interesting system to study magnetic interactions of nanoparticles. Furthermore, studies of cytotoxic effect, hydrodynamic size, and heating capacity for hyperthermia (according to the application of an alternate magnetic field) show that these composites could be applied as a theragnostic material for a non-invasive administration such as nasal.

APA, Harvard, Vancouver, ISO, and other styles

36

Hou, Jianfeng, and Haiwang Wang. "Synthesis and Characterization of Organic–Inorganic Complex." Journal of Nanoelectronics and Optoelectronics 16, no. 3 (March 1, 2021): 466–70. http://dx.doi.org/10.1166/jno.2021.2947.

Full text

Abstract:

An new method is described for fabricating BiFeO3@PVDF composites using sultraviolet light to motivate the surface electronic of BFO conduct reduction system. The synthesis scheme consists of: (a) preparation of BiFeO3 nano particles using Hydrothermal synthesis method. (b) oxidation of the PVDF powders in the effect of the mixed gas (ozone and dioxygen) and sultraviolet light. (c) redox reaction of the oxidated PVDF and BiFeO3 nano particles in the effect of sultraviolet light. The synthesized BiFeO3@PVDF composites show that this method could increase the compatibility between PVDF and BiFeO3 nano particles. Moreover, a formation mechanism for the composite is proposed.

APA, Harvard, Vancouver, ISO, and other styles

37

Yanovsky, Yu G., L. Kh Komissarova, A. N. Danilin, and E. I. Zaraysky. "Comparative Investigations of Structure and Absorptive Capacity of Nano- and Microsized Magnetic-Operated Particles for their Application in Medicine and Biology." Solid State Phenomena 152-153 (April 2009): 403–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.152-153.403.

Full text

Abstract:

For the first time, the comparative investigations of structure and sorption efficiency of nano- and microsized magnetic-operated particles in respect to both the antigen and virus hepatitis B and also to the substance-markers (low-, middle- and highmolecular substances) were carried out. The sorption efficiency of magnetic particles: magnetite (Fe3O4), cobalt-ferrite (CoFe2O4), composite ferro-carbon (FeC) to the substances of different molecular weight was evaluated in vitro experiments. The high absorptive capacity to low- and highmolecular substance-markers has been observed for microsized composites of FeC. Absorptive capacity of the nanosized Fe3O4 and CoFe2O4 particles to the substance-markers was low. But the nanosized Fe3O4 and CoFe2O4 particles had a good absorptive capacity to virus of hepatitis B and its antigen (HBsAg). The sorption efficiency results of nano- and microsized magnetic particles correlate with the structure of their surface.

APA, Harvard, Vancouver, ISO, and other styles

38

Dotsenko, Olga A., and Kirill O. Frolov. "Microwave Composite Absorbers Based on Barium Hexaferrite/Carbon Nanotubes for 0.01-18 GHz Applications." Key Engineering Materials 685 (February 2016): 553–57. http://dx.doi.org/10.4028/www.scientific.net/kem.685.553.

Full text

Abstract:

Nano- and microstructured composite materials have opened a new era for multifunctional materials. In particular, barium hexaferrites and carbon nanotubes can be applied in order to improve electromagnetic properties in composites. Magnetic materials with a texture based on barium ferrite and carbon nanotubes were obtained. The electromagnetic properties of Z – hexaferrites / carbon nanotubes composites were measured at microwave frequencies. It was shown, that imaginary permeability of barium hexaferrites/carbon nanotubes multilayer composites with double texture is as much as that of an isotropic samples at regions 3.4 – 8.5 GHz and 7.1 – 11.6 GHz.

APA, Harvard, Vancouver, ISO, and other styles

39

Kusumaningrum, Irma Kartika, Mira Nur Fadilah, Anugrah Ricky Wijaya, Habiddin Habiddin, and Meliza Armaya. "Synthesis of Nanomagnetite/Crosslinked Carboxymethyl kappa Carrageenan Nickel Imprinted Composite." Malaysian Journal of Fundamental and Applied Sciences 19, no. 4 (August 27, 2023): 707–21. http://dx.doi.org/10.11113/mjfas.v19n4.3038.

Full text

Abstract:

Nickel(II) ions are carcinogenic water pollutants. To increase the accuracy of instrumental analysis of Ni(II) content, several analytical preparation methods have been developed, including solid phase adsorption extraction. The development of magnetic solid phase extraction adsorbents for metal ions is required, to support the application of magnetic solid phase adsorption as a method of separating metal ions in aqueous samples. This research describes the synthesis of Magnetic Solid Phase Extraction adsorbents as Ni(II) ion adsorbents, nano magnetite/carboxymethyl kappa-carrageenan (CMKC) crosslinked bisphenol A diglycidyl ether (BADGE) imprinted Ni(II)-IIP ion composites. This research was carried out in several stages, synthesis and characterization of nano magnetite (NM), synthesis and characterization of CMKC, and synthesis of NM/CMKCNi(II)-IIP adsorbents. The results of the synthesis were analyzed for morphological characteristics, magnetic strength, spectral characteristics, crystallinity, and composition using SEM, FTIR, XRD, and XRF instruments. The adsorption ability of Ni(II) of the adsorbent was tested. Determination of Ni(II) ion content in the sample before and after adsorption was carried out using a flame atomic absorption spectrophotometer (FAAS). Based on the results of spectral character analysis, crystal diffraction patterns, magnetic strength, and morphology, it is confirmed that nano-magnetite has been successfully synthesized. The diameter of the nano magnetite grains is 21.8 nm, the adsorbent NM/CMKCNi(II)-IIP has magnetic properties and wavy surface morphology. The optimum adsorption ability of Ni(II) for the NM/CMKCNi(II)-IIP composite was 2.44 mg Ni(II)/g adsorbent. To evaluate the tendency of the adsorption ability of the adsorbent towards Ni(II) ions in the presence of competitor ions, the adsorption ability of the adsorbent to adsorp Ni(II) ions in samples containing Ni(II) ions, Pb(II) ions and a mixture of Ni(II) ions. and Pb(II) were determined, based on the results of the analysis, the ability of the adsorbent to adsorb Ni(II) ions was higher than the ability of the adsorbent to adsorb Pb(II) ions, in all types of samples.

APA, Harvard, Vancouver, ISO, and other styles

40

Caramitu, Alina R., Romeo C. Ciobanu, Ioana Ion, Cristina M. Schreiner, Mihaela Aradoaei, Violeta Tsakiris, Jana Pintea, and Virgil Marinescu. "Flexible Electromagnetic Shielding Nano-Composites Based on Silicon and NiFe2O4 Powders." Polymers 15, no. 11 (May 25, 2023): 2447. http://dx.doi.org/10.3390/polym15112447.

Full text

Abstract:

In this paper, the obtaining and characterization of five experimental models of novel polymer composite materials with ferrite nano-powder are presented. The composites were obtained by mechanically mixing two components and pressing the obtained mixture on a hot plate press. The ferrite powders were obtained by an innovative economic co-precipitation route. The characterization of these composites consisted of physical and thermal properties: hydrostatic density, scanning electron microscopy (SEM), and TG DSC thermal analyses, along with functional electromagnetic tests in order to demonstrate the functionality of these materials as electromagnetic shields (magnetic permeability, dielectric characteristics, and shielding effectiveness). The purpose of this work was to obtain a flexible composite material, applicable to any type of architecture for the electrical and automotive industry, necessary for protection against electromagnetic interference. The results demonstrated the efficiency of such materials at lower frequencies, but also in the microwave domain, with higher thermal stability and lifetime.

APA, Harvard, Vancouver, ISO, and other styles

41

Bai, J., Z. Yang, F. Wei, M. Matsumoto, and A. Morisako. "Nano-composite FePt–Al2O3 films for high-density magnetic recording." Journal of Magnetism and Magnetic Materials 257, no. 1 (February 2003): 132–37. http://dx.doi.org/10.1016/s0304-8853(02)01166-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Emamian, H. R., A. Honarbakhsh-raouf, A. Ataie, and A. Yourdkhani. "Synthesis and magnetic characterization of MCM-41/CoFe2O4 nano-composite." Journal of Alloys and Compounds 480, no. 2 (July 2009): 681–83. http://dx.doi.org/10.1016/j.jallcom.2009.02.016.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Guan, Feifei, Lanfang Yao, Fujiang Xie, Linlin Tian, Xueling Fang, and Shengli Pu. "Optical and magnetic properties of Fe2O3/SiO2 nano-composite films." Journal of Wuhan University of Technology-Mater. Sci. Ed. 25, no. 2 (April 2010): 206–9. http://dx.doi.org/10.1007/s11595-010-2206-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Zhang, Dong, Xuan Wang, Li-Juan He, Wei Song, Zhi Sun, Bai Han, Jin-Xin Li, and Qing-Quan Lei. "Preparation and characteristic of magnetic LDPE/Fe3O4 nano-composite films." Journal of Materials Science: Materials in Electronics 24, no. 6 (December 11, 2012): 1796–800. http://dx.doi.org/10.1007/s10854-012-1014-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Zhang, Qian, Jun Yan, Tian Peng Li, and Jing Wang. "Preparation of Magnetic Expanded Graphite by Sol-Gel Method and its Electromagnetic Properties." Advanced Materials Research 295-297 (July 2011): 93–97. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.93.

Full text

Abstract:

In order to transform the diamagnetism of expanded graphite (EG) to ferrimagnetism and improve its electromagnetic interferential capability, nano γ-Fe2O3/EG magnetic composite materials was prepared by sol-gel and low temperature self-combustion technique. The as prepared samples were characterized by SEM, XRD and Magnetic hysteresis cycle test. The results indicated that the composite materials had ferrimagnetism property after the embedding of γ-Fe2O3, but the average conductivity of the composites decreases gradually with the increase of γ-Fe2O3. Different mixing ratio of ferrite gel and graphite intercalation compounds produced ferric oxide with different crystal form and shape. When the content of ferrite sol was low, spherical γ-Fe2O3with the mean size of 31.69nm was formed, and spread unevenly on the surface and interformational micelles of EG. High content of ferrite sol (83wt%) produced more perfect crystal γ-Fe2O3of pentahedron shape with the mean size of 44.68nm, and a few of α-Fe2O3occurred which lead to the decline of the magnetic property of the composite materials.

APA, Harvard, Vancouver, ISO, and other styles

46

Safarik, Ivo, and Mirka Safarikova. "Magnetically Responsive Nanocomposite Materials for Bioapplications." Solid State Phenomena 151 (April 2009): 88–94. http://dx.doi.org/10.4028/www.scientific.net/ssp.151.88.

Full text

Abstract:

Magnetic nano- and microparticles have already found many important applications in various areas of biosciences, medicine, biotechnology, environmental technology etc. These smart materials exhibit different types of response to external magnetic field. In most cases they can be described as composite materials, where the magnetic properties are caused by the presence of iron oxides nano- or microparticles. Such materials can be efficiently separated from difficult-to-handle samples and targeted to the desired place, applied as contrast agents for magnetic resonance imaging, used to generate heat during exposure to alternating magnetic field or to modify biomolecules and biological structures.

APA, Harvard, Vancouver, ISO, and other styles

47

Wolff, Maximilian, Apurve Saini, David Simonne, Franz Adlmann, and Andrew Nelson. "Time Resolved Polarised Grazing Incidence Neutron Scattering from Composite Materials." Polymers 11, no. 3 (March 7, 2019): 445. http://dx.doi.org/10.3390/polym11030445.

Full text

Abstract:

Neutron scattering experiments are a unique tool in material science due to their sensitivity to light elements and magnetic induction. However, for kinetic studies the low brilliance at existing sources poses challenges. In the case of periodic excitations these challenges can be overcome by binning the scattering signal according to the excitation state of the sample. To advance into this direction we have performed polarised and time resolved grazing incidence neutron scattering measurements on an aqueous solution of the polymer F127 mixed with magnetic nano-particles. Magnetic nano-composites like this provide magnetically tuneable properties of the polymer crystal as well as magnetic meta-crystals. Even though the grazing incidence small angle scattering and polarised signals are too weak to be evaluated at this stage we demonstrate that such experiments are feasible. Moreover, we show that the intensity of the 111 Bragg peak of the fcc micellar crystal depends on the actual shear rate, with the signal being maximised when the shear rate is lowest (and vice-versa).

APA, Harvard, Vancouver, ISO, and other styles

48

Choowitsakunlert, Salinee, Thanatcha Satitchantrakul, and Rardchawadee Silapunt. "A 1D Analysis of Nano Multiferroic Composites for the Novel Read Head Technology." Advanced Materials Research 1052 (October 2014): 149–54. http://dx.doi.org/10.4028/www.scientific.net/amr.1052.149.

Full text

Abstract:

The magnetoelectric (ME) effect induced in a multiferroic composite is potentially a key to improve the performance of the nanoread head in the future magnetic recording device. In this paper, the analysis of the 1-dimensional (1D) L-T mode model containing sandwiched structures of Terfenol-D/Lead zirconate titanate (PZT)/Terfenol-D nanomultiferroic composites is performed. The magnetostriction process is described using the 1D standard square law. The magnetoelectric coupling is then investigated. The piezoelectric response on the applied dc magnetic field and PZT to Terfenol-D thickness (tp:tm) ratio, is determined. The optimal electric field and potential across the PZT layer are achieved at 1.3:1 thickness ratio. The result agrees well with the associated magnetic field-induced strain profile. The peak ME coefficient is found at 1.37:1 thickness ratio.

APA, Harvard, Vancouver, ISO, and other styles

49

Liu, Yongmeng, Erchuang Fan, Ruohan Hou, Peng Zhang, Shijie Zhang, and Guosheng Shao. "A simple synthesis of magnetic metal implanted hierarchical porous carbon networks for efficient microwave absorption." Journal of Materials Chemistry C 9, no. 41 (2021): 14866–75. http://dx.doi.org/10.1039/d1tc03217h.

Full text

Abstract:

A hierarchical porous carbon composite decorated with magnetic metal nano sites was greenly and rapidly prepared by adopting water-soluble NaCl as a template for high-perfoemance microwave absorption.

APA, Harvard, Vancouver, ISO, and other styles

50

Kolev, Svetoslav, Tatyana Koutzarova, Andrey Yanev, Chavdar Ghelev, and Ivan Nedkov. "Microwave Properties of Polymer Composites Containing Combinations of Micro- and Nano-Sized Magnetic Fillers." Journal of Nanoscience and Nanotechnology 8, no. 2 (February 1, 2008): 650–54. http://dx.doi.org/10.1166/jnn.2008.b069.

Full text

Abstract:

We investigated the microwave absorbing properties of composite bulk samples with nanostructured and micron-sized fillers. As magnetic fillers we used magnetite powder (Fe3O4 with low magnetocrystalline anisotropy) and strontium hexaferrite (SrFe12O19 with high magnetocrystalline anisotropy). The dielectric matrix consisted of silicone rubber. The average particle size was 30 nm for the magnetite powder and 6 μm for the strontium hexaferrite powder. The micron-sized SrFe12O19 powder was prepared using a solid-state reaction. We investigated the influence of the filler concentration and the filler ratio (Fe3O4/SrFe12O19) in the polymer matrix on the microwave absorption in a large frequency range (1 ÷ 18 GHz). The results obtained showed that the highly anisotropic particles become centers of clusterification and the small magnetite particles form magnetic balls with different diameter depending on the concentration. The effect of adding micron-sized SrFe12O19 to the nanosized Fe3O4 filler in composites absorbing structures has to do with the ferromagnetic resonance (FMR) shifting to the higher frequencies due to the changes in the ferrite filler's properties induced by the presence of a magnetic material with high magnetocrystalline anisotropy. The two-component filler possesses new values of the saturation magnetization and of the anisotropy constant, differing from those of both SrFe12O19 and Fe3O4, which leads to a rise in the effective anisotropy field. The results demonstrate the possibility to vary the composite's absorption characteristics in a controlled manner by way of introducing a second magnetic material.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Magnetic Nano Composite'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles