scholarly journals Magnetic Graphene-Based Sheets for Bacteria Capture and Destruction Using a High-Frequency Magnetic Field

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 674
Author(s):  
Andri Hardiansyah ◽  
Ming-Chien Yang ◽  
Hung-Liang Liao ◽  
Yu-Wei Cheng ◽  
Fredina Destyorini ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
High Frequency ◽  
Potential Measurement ◽  
X Ray ◽  
Modified Graphene Oxide ◽  
Frequency Magnetic Field ◽  
High Frequency Magnetic Field

Magnetic reduced graphene oxide (MRGO) sheets were prepared by embedding Fe3O4 nanoparticles on polyvinylpyrrolidone (PVP) and poly(diallyldimethylammonium chloride) (PDDA)-modified graphene oxide (GO) sheets for bacteria capture and destruction under a high-frequency magnetic field (HFMF). The characteristics of MRGO sheets were evaluated systematically by transmission electron microscopy (TEM), scanning electron microscopy (SEM), zeta potential measurement, X-ray diffraction (XRD), vibrating sample magnetometry (VSM), and X-ray photoelectron spectroscopy (XPS). TEM observation revealed that magnetic nanoparticles (8–10 nm) were dispersed on MRGO sheets. VSM measurements confirmed the superparamagnetic characteristics of the MRGO sheets. Under HFMF exposure, the temperature of MRGO sheets increased from 25 to 42 °C. Furthermore, we investigated the capability of MRGO sheets to capture and destroy bacteria (Staphylococcus aureus). The results show that MRGO sheets could capture bacteria and kill them through an HFMF, showing a great potential in magnetic separation and antibacterial application.

scholarly journals Improvement of Dispersibility of Graphene Oxide by Surface Modification with Rare Earths

2022 ◽  
Author(s):  
Yong Li ◽  
Zhou Jiang ◽  
Haidong Yu ◽  
Xuebin Zhou ◽  
Peng Yi
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Photoelectron Spectroscopy ◽  
Energy Dispersive Spectrometer ◽  
X Ray ◽  
Modified Graphene Oxide ◽  
Modified Graphene ◽  
The Rare Earth

Abstract Rare earth-modified graphene oxide (RE-M-GO) materials were successfully prepared by infiltration and heating modifier method. The morphology and phase structure of RE-M-GO were characterized by scanning electron microscopy(SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and energy dispersive spectrometer(EDS). The changes of the chemical structure were indicated by Fourier transform infrared (FTIR). X-ray photoelectron spectroscopy(XPS) was used to study the chemical state of the surface elements of graphene oxide which showed that the rare earth elements were added to the graphene oxide functional groups through the coordination reaction. Additionally, the findings concluded that the effect of modification by Ce is more obvious than La elements and the RE-M-GO materials prepared by the heating modifier method had better dispersibility than infiltration. With activating effect, the rare earth elements grafting to graphene oxide will contribute to its combination with other materials.

Fabrication of MgAl2O4 Reinforced Aluminum Matrix Gradient Composites under High Frequency Magnetic Field

2011 ◽  
Vol 311-313 ◽  
pp. 48-53
Author(s):  
Zhi Qiang Cao ◽  
Peng Chao Li ◽  
Tong Min Wang ◽  
Ting Ju Li
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Radial Direction ◽  
Aluminum Matrix ◽  
Diffusion Reaction ◽  
Electromagnetic Separation ◽  
X Ray ◽  
Frequency Magnetic Field ◽  
High Frequency Magnetic Field ◽  
Center Area

Two kinds of gradient composites, whose compositions were Al-20%Mg2Si-5%Si (sample-1) and Al-14.9%Mg2Si-10.3%Si-11.8% MgAl2O4 (sample-2), were fabricated based on the electromagnetic separation under the high frequency magnetic field. The microcosmic structures of two composites were analyzed and the effect of the addition of SiO2 on the microcosmic structure and the mechanical property were discussed. It is found that the particles MgAl2O4 accumulated in periphery of specimen of sample-2, which come from the diffusion reaction between SiO2 and aluminum and magnesium in the melt and was proved by the result of X-ray analysis. Besides the MgAl2O4, the primary phases of Mg2Si, Si also emerged in periphery of specimens. At last, the hardness was given along the radial direction. The result shows that the hardness of the two materials exhibit graded distribution in radial direction and the hardness of sample-2 is higher than that of sample-1 due to the formation of MgAl2O4 particles. Both the two materials meet the requirements of gradient composite material whose outer area is in high intensity and center area is in flexile.

Styrene–butadiene–styrene copolymer-compatibilized interfacial-modified graphene oxide with mechanical and electrical properties

2015 ◽  
Vol 30 (9) ◽  
pp. 1228-1241 ◽  
Author(s):  
Hengwei Wang ◽  
Zhe Wang ◽  
Xue Wang ◽  
Lun Wang ◽  
Yanhua Cai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Electrical Properties ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Mechanical And Electrical Properties ◽  
Modified Graphene Oxide ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

This article deals with the investigation of electrical and mechanical properties of styrene–butadiene–styrene tri-block copolymer (SBS) nanocomposites containing SBS-grafted graphene oxide (SBS- g-GO) nanofillers dispersed in the SBS matrix through a solution processing method. In order to improve the compatibility of graphene oxide in SBS, graphene oxide was modified by maleic anhydride-grafted SBS to SBS- g-GO. The SBS- g-GO were characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, and thermogravimetric analysis. The results showed that the SBS molecules were homogeneously bonded onto the surface of the GO, leading to an improvement of the mechanical and electrical properties of SBS/SBS- g-GO composites due to the excellent interfacial adhesion and dispersion of SBS- g-GO in SBS.

Motion behavior of non-metallic particles under high frequency magnetic field

2009 ◽  
Vol 19 (3) ◽  
pp. 674-680 ◽  
Author(s):  
Zhong-tao ZHANG ◽  
Qing-tao GUO ◽  
Feng-yun YU ◽  
Jie LI ◽  
Jian ZHANG ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Metallic Particles ◽  
Frequency Magnetic Field ◽  
High Frequency Magnetic Field ◽  
Motion Behavior

High frequency magnetic field sensors based on the Faraday effect in garnet thick films

1992 ◽  
Vol 60 (17) ◽  
pp. 2048-2050 ◽  
Author(s):  
R. Wolfe ◽  
E. M. Gyorgy ◽  
R. A. Lieberman ◽  
V. J. Fratello ◽  
S. J. Licht ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Faraday Effect ◽  
Thick Films ◽  
Magnetic Field Sensors ◽  
Frequency Magnetic Field ◽  
High Frequency Magnetic Field

scholarly journals ANALYSIS OF HIGH-FREQUENCY C-CORE MAGNETIC FLUX LEAKAGES FOR BONE TUMOR WITH INDUCTION HEATING BY USING MULTI-COIL

2019 ◽  
Author(s):  
Metharak Jokpudsa ◽  
Supawat Kotchapradit ◽  
Chanchai Thongsopa ◽  
Thanaset Thosdeekoraphat
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Tumor Tissue ◽  
Low Frequency ◽  
Heat Energy ◽  
High Frequencies ◽  
Frequency Magnetic Field ◽  
High Frequency Magnetic Field ◽  
The Magnetic Field ◽  
Flux Leakage

High-frequency magnetic field has been developed pervasively. The induction of heat from the magnetic field can help to treat tumor tissue to a certain extent. Normally, treatment by the low-frequency magnetic field needed to be combined with magnetic substances. To assist in the induction of magnetic fields and reduce flux leakage. However, there are studies that have found that high frequencies can cause heat to tumor tissue. In this paper present, a new magnetic application will focus on the analysis of the high-frequency magnetic nickel core with multi-coil. In order to focus the heat energy using a high-frequency magnetic field into the tumor tissue. The magnetic coil was excited by 915 MHz signal and the combination of tissues used are muscle, bone, and tumor. The magnetic power on the heating predicted by the analytical model, the power loss density (2.98e-6 w/m3) was analyzed using the CST microwave studio.

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