scholarly journals Fabrication and characterization of magnetic nanocomposites by electric fields assisted electrospinning

2019 ◽  
Vol 23 (4) ◽  
pp. 2365-2372 ◽  
Author(s):  
Yanhua Song ◽  
Lan Xu ◽  
Jianhua Sui
Keyword(s):  
Electron Microscopy ◽  
Electric Fields ◽  
Composite Nanofibers ◽  
Magnetic Nanocomposites ◽  
Magnetic Composite ◽  
Fabrication And Characterization ◽  
Conductive Properties ◽  
Copper Ring ◽  
Scanning Electron

A magnetic and electric fields assisted electrospinning, in which a charged copper ring was placed between the needle and the two paralleled magnets receivers, was presented to produce aligned polyacrylonitrile/graphene/Fe3O4 (PAN/Gr/Fe3O4) magnetic composite nanofibers. Characterizations of the magnetic composite nanofibers were investigated by means of scanning electron microscopy, Fourier transform infrared spectroscopy, high-resistance meter, and other methods. The results showed that Gr and Fe3O4 nanoparticles are suitable additives to improve alignment degree and conductive properties of nanofibers.

Fabrication and Characterization of Fibrous Polycaprolactone Blended with Natural Green Tea Extracts Using Dual Solvent Systems

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ainatul Aqilah Binti Mohd Rashid ◽  
Saravana Kumar Jaganathan ◽  
Ahmad Zahran Mohd Khudzari ◽  
Ahmad Fauzi Ismail
Keyword(s):  
Electron Microscopy ◽  
Green Tea ◽  
Water Uptake ◽  
Wound Dressing ◽  
Electrospun Fibers ◽  
Fibrous Morphology ◽  
Solvent Systems ◽  
Fabrication And Characterization ◽  
Scanning Electron

AbstractNanofibrous dressings serve as an impeccable candidate in the management of wounds. Nanofibrous composites composed of polycaprolactone (PCL) and green tea using dual solvent systems at different ratios were fabricated through electrospinning. Pure PCL electrospun fibers along with composites were characterized by using scanning electron microscopy (SEM), wettability, water uptake analysis, and Fourier transform infrared spectroscopy (FTIR). SEM indicated that fibrous morphology and the diameter of PCL/green tea were smaller for chloroform/dimethylformamide (DMF) (601 nm) and acetone/DMF (896 nm) than the pure PCL (673 nm and 1,104 nm for chloroform/DMF and acetone/DMF, respectively). Wettability of the fabricated composites was increased, and pure PCL fibers were slightly more hydrophobic (100°) than PCL/green tea (94°). Water uptake of the composites was enhanced compared with PCL significantly in acetone/DMF. The PCL/green tea nanofibrous wound dressing with enhanced physicochemical properties serves as an indispensable candidate for wound healing applications.

Fabrication and Characterization of Bi1.6Pb0.4Sr2Ca2Cu3-xFexOy Superconductor

2017 ◽  
Vol 268 ◽  
pp. 311-314 ◽  
Author(s):  
M.A. Suazlina ◽  
H. Azhan ◽  
S. Akmal Syamsyir ◽  
K. Azman ◽  
W.A.W. Razali ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Undoped Sample ◽  
Fe Doping ◽  
X Ray Diffraction ◽  
Solid State Reaction Technique ◽  
X Ray ◽  
Oxide Powders ◽  
Fabrication And Characterization ◽  
Scanning Electron

This paper reports the properties of Bi-2223 superconductors that had been doped with Fe2O3 at Cu-site of the system. It was prepared in bulk form using high purity oxide powders via solid state reaction technique with intermediate grinding. A series of x = 0.00, 0.02, 0.04, 0.06, 0.08 and 0.10 of Fe were stoichiometrically added to the well balanced of Bi1.6Pb0.4Sr2Ca2Cu3-xFexOy in order to trace the effect of Fe doping. Hence, electrical resistivity, X-ray diffraction and Field Emission Scanning Electron Microscopy have been carried out to assess the effects of Fe doping. These measurements indicate that Fe doping decreased the critical temperature and degrade the formation of high Tc phase compared with the undoped sample. The orthorhombicity parameters were increased due to substitution of Cu 3+ ion by Fe 2+ ion.

Fabrication and Characterization of Ag@PS Composite Nanospheres

2013 ◽  
Vol 651 ◽  
pp. 204-209
Author(s):  
Ya Wei Zhou ◽  
Xiao Peng Zhao ◽  
Chao Shun Yang ◽  
Guo Fei An
Keyword(s):  
Electron Microscopy ◽  
Composite Nanoparticles ◽  
Complex Ions ◽  
X Ray ◽  
Shell Nanostructures ◽  
Transmission Electron ◽  
Fabrication And Characterization ◽  
Silver Composite ◽  
Scanning Electron

We report a facile method for the fabrication of polystyrene/silver composite nanoparticles with core-shell nanostructures. First, polystyrene (PS) nanoparticles with carboxyl acid groups on their surfaces were prepared via the dispersion polymerisation of styrene in water with the assistance of acrylic acid. Second, with the addition of [Ag(NH3)2]+ to the PS dispersion, [Ag(NH3)2]+ was absorbed onto the surfaces of the modified PS nanoparticles. Finally, the [Ag(NH3)2]+ complex ions were reduced to Ag to form the PS/Ag nanocomposites upon heating. The resulting PS/Ag composite nanoparticles were characterized via scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, and dynamic light scattering.

Production and Characterization of Whey Protein Concentrate (WPC) Based Nano-Fibers

2018 ◽  
Vol 923 ◽  
pp. 47-50
Author(s):  
Faik Nüzhet Oktar ◽  
Sena Su ◽  
Burak Ozbek ◽  
Sevil Yücel ◽  
Dilek Kazan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Whey Protein ◽  
Composite Nanofibers ◽  
Whey Protein Concentrate ◽  
Protein Concentrate ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Scanning Electron

In this study, whey protein concentrate (WPC) and poly (ε-caprolactone) (PCL) composite nanofibers were prepared by electrospinning in the diameter of 50-350nm. Characterization tests of the polymer solutions such as density, viscosity, conductivity was studied. Fourier-transformed infrared spectroscopy (IR) results confirmed that the processed fibers were composed of both PCL and WPC constituents. Morphology of nanofibers composite was observed using scanning electron microscopy (SEM). Moreover the PCL/WPC nanofibers with high WPC content exhibited the maximum tensile strength (about 1.40 MPa).

Fabrication of MgB2 Bulk Magnets with High Critical Currents

2014 ◽  
Vol 95 ◽  
pp. 196-201 ◽  
Author(s):  
Miryala Muralidhar ◽  
Kazuo Inoue ◽  
Michael R. Koblischka ◽  
Masato Murakami
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Performance ◽  
Critical Currents ◽  
Industrial Applications ◽  
Superconducting Transition ◽  
Fabrication And Characterization ◽  
Highly Porous ◽  
Scanning Electron

We report on the fabrication and characterization of disk-shaped bulk MgB2 superconductors with high performance as superconducting bulk magnets. Several samples of diameters 20 mm, 30 mm and 40 mm were fabricated using a solid state reaction in pure Ar atmosphere at 775°C for 3h. The magnetization measurements confirmed that all the samples exhibited a sharp superconducting transition with Tc(onset) at around 38.5 K. The samples showed respective critical current density (Jc) values of 176 kA cm-2 and 55 kA cm-2 at 20 K in self field and 1T. The Jc values increased further to 250 kA cm-2 and 100 kA cm-2 with decreasing temperature down to 10 K. MgB2 samples 20 mm and 30 mm in diameter and 7 mm in thickness exhibited trapped field values of 1.15 T and 1.3 T at 25 K, respectively. Microstructural observations with scanning electron microscopy (SEM) revealed that the samples are highly porous. And hence, continuing development of large-sized bulk MgB2 with higher density will lead to promising industrial applications.

Characterization of CMOS Structures (0.6 µm process) Submitted to HBM and COM ESD Stress Tests

1997 ◽  
Author(s):  
G. Meneghesso ◽  
E. Zanoni ◽  
P. Colombo ◽  
M. Brambilla ◽  
R. Annunziata ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrostatic Discharge ◽  
Stress Test ◽  
Complete Characterization ◽  
Stress Tests ◽  
Test Procedures ◽  
Emission Microscopy ◽  
Fast Rise ◽  
Scanning Electron

Abstract In this work, we present new results concerning electrostatic discharge (ESD) robustness of 0.6 μm CMOS structures. Devices have been tested according to both HBM and socketed CDM (sCDM) ESD test procedures. Test structures have been submitted to a complete characterization consisting in: 1) measurement of the tum-on time of the protection structures submitted to pulses with very fast rise times; 2) ESD stress test with the HBM and sCDM models; 3) failure analysis based on emission microscopy (EMMI) and Scanning Electron Microscopy (SEM).

Isolasi Dan Karakterisasi Bentonit Alam Menjadi Nanopartikel Monmorillonit

2018 ◽  
Vol 3 (1) ◽  
pp. 12 ◽  
Author(s):  
Zaimahwati Zaimahwati ◽  
Yuniati Yuniati ◽  
Ramzi Jalal ◽  
Syahman Zhafiri ◽  
Yuli Yetri
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Surface Morphology ◽  
Average Diameter ◽  
Particle Size Analyzer ◽  
Ft Ir ◽  
Scanning Electron ◽  
Sedimentation Processes

<p>Pada penelitian ini telah dilakukan isolasi dan karakterisasi bentonit alam menjadi nanopartikel montmorillonit. Bentonit alam yang digunakan diambil dari desa Blangdalam, Kecamatan Nisam Kabupaten Aceh Utara.  Proses isolasi meliputi proses pelarutan dengan aquades, ultrasonic dan proses sedimentasi. Untuk mengetahui karakterisasi montmorillonit dilakukan uji FT-IR, X-RD dan uji morfologi permukaan dengan Scanning Electron Microscopy (SEM). Partikel size analyzer untuk menganalisis dan menentukan ukuran nanopartikel dari isolasi bentonit alam. Dari hasil penelitian didapat ukuran nanopartikel montmorillonit hasil isolasi dari bentonit alam diperoleh berdiameter rata-rata 82,15 nm.</p><p><em>In this research we have isolated and characterized natural bentonite into montmorillonite nanoparticles. Natural bentonite used was taken from Blangdalam village, Nisam sub-district, North Aceh district. The isolation process includes dissolving process with aquades, ultrasonic and sedimentation processes.  The characterization of montmorillonite, FT-IR, X-RD and surface morphology test by Scanning Electron Microscopy (SEM). Particle size analyzer to analyze and determine the size of nanoparticles from natural bentonite insulation. From the research results obtained the size of montmorillonite nanoparticles isolated from natural bentonite obtained an average diameter of 82.15 nm.</em></p>

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