Effects of Fe3O4 Nano Particles Addition in High Temperature Superconductor YBa2Cu3O7-δ

2012 ◽  
Vol 501 ◽  
pp. 309-313 ◽  
Author(s):  
Siti Nurdalila Abd-Ghani ◽  
Roslan Abd-Shukor ◽  
Wei Kong
Keyword(s):  
Transport Properties ◽  
Solid State Reaction Method ◽  
Nano Particles ◽  
Magnetic Impurities ◽  
Oxide Powders ◽  
Nano Fe3o4 ◽  
Activated Flux ◽  
Average Size ◽  
Increasing Temperature ◽  
Magnetic Nano Particles

The effects of nano particles Fe3O4 addition on the superconducting and transport properties of YBa2Cu3O7-δ (YBCO) were studied. YBa2Cu3O7-δ superconductor powders were prepared by using high purity oxide powders via solid state reaction method. Nano Fe3O4 with 0.01 – 0.05 wt.% with average size 28 nm was added into YBCO. The transition temperatures (Tc) of the samples were measured by using four point probe method. The critical current (Ic) of the samples has been determined by using the 1 μV/cm criterion from 30 – 77 K. Sample with 0.02 wt.% nano Fe3O4 showed the highest Tc at 87 K. It is interesting to note the same sample also exhibited the highest Jc at 77 K up to 1683 mA/cm2. Nano Fe3O4 has acted as effective flux pinning centers in YBCO. A small amount of nano particles Fe3O4 addition has successfully improved the superconducting and transport properties of YBCO. The excessive addition of nano Fe3O4 (> 0.02 wt.%) suppressed the Tc and Jc. Overall, Jc decreases with increasing temperature (30 – 77 K) as a consequence of thermally activated flux creep. Magnetic impurities normally suppress superconductivity. However, by adding magnetic nano particles, current carrying capacity of superconductors YBCO was enhanced significantly.

Effect of Ni0.5Zn0.5Fe2O4 Nanoparticles Addition on Tl-1212 High Temperature Superconductor

2020 ◽  
Vol 307 ◽  
pp. 98-103
Author(s):  
Wei Kong ◽  
Christopher Jacob ◽  
Ing Kong ◽  
Cin Kong ◽  
Eng Hwa Yap ◽  
...  
Keyword(s):  
Critical Current ◽  
High Temperature Superconductor ◽  
Diffraction Method ◽  
Solid State Reaction Method ◽  
Transport Critical Current Density ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Powders ◽  
A Value ◽  
Average Size

The effects of Ni0.5Zn0.5Fe2O4 nanoparticle addition on the superconducting and transport properties of (Tl0.85Cr0.15)Sr2CaCu2O7 (Tl-1212) superconductor were investigated in this paper. The Tl-1212 samples were produced by mixing high purity oxide powders through a solid-state reaction method. Nano Ni0.5Zn0.5Fe2O4 particles with compositions of 0.001 wt.%, 0.003 wt.%, 0.005 wt.%, 0.01 wt.% and 0.02wt.% with average size of 60 nm were added into the Tl-1212 powders. The transition temperatures (Tc-zero and Tc-onset) were measured using a four-point probe method. The highest Tc-zero recorded was 97 K which was exhibited by the pure Tl-1212 sample. The transport critical current, Ic, of the Tl-1212 samples were found through the 1 µV/cm criterion with temperature ranging from 30 K to 77 K. The sample with a composition of 0.003 wt.% displayed the highest value of Jc at 77 K with a value ranging up to 1780 mA/cm2. The Tl-1212 samples were characterised using scanning electron microscopy (SEM), powder X-ray diffraction method (XRD), energy dispersive X-Ray analysis (EDX), electrical resistance measurements and transport critical current density measurements. The Jc of the Tl-1212 superconductor has been improved through the addition of Ni0.5Zn0.5Fe2O4 nanoparticles but adding an excessive amount has caused its Jc to degrade.

Enhanced Transport Critical Current Density of NiO Nano Particles Added YBCO Superconductors

2014 ◽  
Vol 895 ◽  
pp. 105-108 ◽  
Author(s):  
Siti Nurdalila Abd-Ghani ◽  
Hon Kah Wye ◽  
Ing Kong ◽  
Roslan Abd-Shukor ◽  
Wei Kong
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Solid State Reaction Method ◽  
Nano Particles ◽  
Transport Critical Current Density ◽  
Ybco Superconductor ◽  
Nio Nanoparticles ◽  
Oxide Powders ◽  
Ybco Superconductors

The effects of NiO nanoparticles addition in YBa2Cu3O7-δ (YBCO) superconductors had been investigated. YBCO superconductor powders were prepared by using high purity oxide powders via solid state reaction method. 0.01 0.05 wt.% of NiO nanoparticles were added into YBCO. The critical temperature (Tc) and transport critical current density (Jc) were determined by using four point probe method. The lattice parameters and morphology of the samples were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), respectively. Tc of YBCO increased from 84 K to 87 K with 0.02 wt.% of NiO nanoparticles addition. The addition on NiO nanoparticles have significantly enhanced transport critical current density of YBCO by acting as flux pinning centers. YBCO with 0.03 wt.% of NiO nanoparticles performed the highest Jcup to 1265 mA/cm2 among the NiO-added samples. However, excessive addition of NiO nanoparticles in YBCO caused degradation in Tc and Jc.

Effects of Gamma Ray Irradiation on High Temperature Superconductors YBCO with Nanoparticles Fe3O4 Addition

2015 ◽  
Vol 1107 ◽  
pp. 595-600 ◽  
Author(s):  
Kong Wei ◽  
Siti Nurdalila Abd-Ghani ◽  
Hon Kah Wye ◽  
Kong Ing ◽  
Roslan Abd-Shukor
Keyword(s):  
High Temperature ◽  
Gamma Ray ◽  
High Temperature Superconductors ◽  
Solid State Reaction Method ◽  
Nano Particles ◽  
Transport Critical Current Density ◽  
Ybco Superconductor ◽  
Oxide Powders ◽  
Before And After ◽  
Gamma Ray Irradiation

<p>The effects of gamma ray irradiation on high temperature superconductors YBa2Cu3O7-δ with nano particles Fe3O4 (20-30 nm) addition were investigated. YBCO superconductor powders were prepared by using high purity oxide powders via solid state reaction method. 0.01 – 0.05 wt.% of nano particles were added into YBCO. Samples were irradiated with 100 kGy gamma ray. The critical temperature (Tc) and transport critical current density (Jc) were determined by using four point probe method. The lattice parameters and morphology of the samples were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), respectively. The results before and after gamma ray irradiation were compared. All of the samples showed increased Tc-zero after 100 kGy gamma ray irradiation. However, the Jcwas degraded after gamma ray irradiation. There is no significant variation found in the XRD patterns. The porosity of the samples was increased by the gamma ray irradiation. It can be concluded that gamma ray irradiation has enhanced the superconducting properties but degraded the transport properties.</p>

ON-LINE CHARACTERIZATION OF MAGNETIC NANO PARTICLES - SIMULATION VERSUS EXPERIMENT

2001 ◽  
Vol 32 ◽  
pp. 385-386
Author(s):  
TH. KAUFFELDT ◽  
E. KAUFFELDT ◽  
T. ZARUTSKAYA ◽  
M. SHAPIRO ◽  
A. SCHMIDT-OTT
Keyword(s):  
Nano Particles ◽  
On Line ◽  
Magnetic Nano Particles

Comparative study of three magnetic nano-particles (FeSO4, FeSO4/SiO2, FeSO4/SiO2/TiO2) in plasmid DNA extraction

2016 ◽  
Vol 513 ◽  
pp. 68-76 ◽  
Author(s):  
H. Rahnama ◽  
A. Sattarzadeh ◽  
F. Kazemi ◽  
N. Ahmadi ◽  
F. Sanjarian ◽  
...  
Keyword(s):  
Comparative Study ◽  
Dna Extraction ◽  
Plasmid Dna ◽  
Nano Particles ◽  
Magnetic Nano Particles

Electronic Transport Properties of Hot-Pressed B6Si

1987 ◽  
Vol 97 ◽  
Author(s):  
C. Wood ◽  
D. Emin ◽  
R. S. Feigelson ◽  
I. D. R. Mackinnon
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Electronic Transport ◽  
Hall Mobility ◽  
Anomalous Behavior ◽  
Nominal Composition ◽  
Electronic Transport Properties ◽  
Increasing Temperature ◽  
P Type

ABSTRACTMeasurements of the electrical conductivity, Seebeck coefficient and Hall mobility from -300 K to -1300 K have been carried out on multiphase hotpressed samples of the nominal composition B6Si. In all samples the conductivity and the p-type Seebeck coefficient both increase smoothly with increasing temperature. By themselves, these facts suggest small-polaronic hopping between inequivalent sites. The measured Hall mobilities are always low, but vary in sign. A possible explanation is offered for this anomalous behavior.

scholarly journals The effects of calcination and doping on structural and dielectric properties of CaCu3-xCoxTi4O12 ceramic

2019 ◽  
Vol 8 (3) ◽  
pp. 234
Author(s):  
Nasr Hadi ◽  
Tajdine Lamcharfi ◽  
Farid Abdi ◽  
Nor-Said Echtoui ◽  
Ahmed Harrach ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Complex Impedance ◽  
Impedance Analysis ◽  
Xrd Analysis ◽  
Secondary Phases ◽  
Solid State Method ◽  
Complex Impedance Analysis ◽  
Oxide Powders ◽  
Increasing Temperature

<p class="Abstract"><span lang="EN-US">The influences of calcination temperature and doping with cobalt in A–site on structural and dielectric properties of CaCu<sub>3-x</sub>Co<sub>x</sub>Ti<sub>4</sub>O<sub>12</sub> (CCCxTO, x = 0.00, 0.02 and 0.10) ceramics sintered at 1050 <sup>0</sup>C for 8h were investigated. The ceramic samples are prepared by the conventional solid-state method using high purity oxide powders, and they are calcined at 850 °C, 950 °C and 1050 <sup>0</sup>C for 4h. The X-ray diffraction (XRD) analysis of pure and doped CCTO samples calcined at 950 °C and 1050 <sup>0</sup>C showed no traces of any other secondary phases, while impurity phases alongside CCTO phase in the x=0.00 sample calcined at 850 <sup>0</sup>C was observed. Scanning electron microscopy (SEM) investigation showed an increase in grain size with increasing of Co content and calcining temperature. Dielectric measurements indicated that the dielectric constant of the pure CCTO calcined at 1050 <sup>0</sup>C/4h has a low value in the frequency range of 1kHz up to 1MHz, whereas the substitution of Co up to x = 0.10 into CCTO caused a huge increase in the dielectric constant value of the calcined samples which is equal to 153419 and 18957 at 950 <sup>°</sup>C and 1050 <sup>0</sup>C respectively. The complex impedance analysis of all samples shows a decrease in resistance with an increasing temperature, which suggests a semiconductor nature of the samples.</span></p>

Fabrication of periodic microscale stripes of silver by laser interference induced forward transfer and their SERS properties

2021 ◽  
Author(s):  
Huijuan Shen ◽  
Yaode Wang ◽  
Liang Cao ◽  
Ying Xie ◽  
Lu Wang ◽  
...  
Keyword(s):  
Film Thickness ◽  
Laser Fluence ◽  
Nano Particles ◽  
Good Resolution ◽  
Laser Interference ◽  
Ag Nps ◽  
Wide Range ◽  
Forward Transfer ◽  
Stripe Structure ◽  
Average Size

Abstract The micro-stripe structure was prepared by laser interference induced forward transfer (LIIFT) technique, composed of Ag nano-particles (NPs). The effects of the film thickness with the carbon nano-particles mixed polyimide (CNPs@PI), Ag film thickness, and laser fluence were studied on the transferred micro-stripe structure. The periodic Ag micro-stripe with good resolution was obtained in a wide range of CNPs@PI film thickness from ~ 0.5 μm to ~ 1.0 μm for the Ag thin film ~ 20 nm. The distribution of the Ag NPs composing the micro-stripe was compact. Nevertheless, the average size of the transferred Ag NPs was increased from ~ 41 nm to ~ 197 nm with the change of the Ag donor film from ~ 10 nm to ~ 40 nm. With the increase of the laser fluence from 102 mJ•cm-2 to 306 mJ•cm-2 per-beam, the transferred Ag NPs became aggregative, improving the resolution of the corresponding micro-stripe. Finally, the transferred Ag micro-stripe exhibited the significant surface enhanced Raman scattering (SERS) property for rhodamine B (RhB). While the concentration of the RhB reached 10-10 mol•L-1, the Raman characteristic peaks of the RhB were still observed clearly at 622 cm-1, 1359 cm-1, and 1649 cm-1. These results indicate that the transferred Ag micro-stripe has potential application as a SERS chip in drug and food detection.

Fibrinogen C-terminal peptidic sequences (Haptides) modulate fibrin polymerization

2004 ◽  
Vol 91 (01) ◽  
pp. 43-51 ◽  
Author(s):  
Matti Ben-Moshe ◽  
Sholomo Magdassi ◽  
Raphael Gorodetsky ◽  
Gerard Marx
Keyword(s):  
Platelet Aggregation ◽  
Cell Attachment ◽  
Fibrin Clot ◽  
Nano Particles ◽  
Amino Acid Residues ◽  
Fibrin Gel ◽  
Transmission Microscopy ◽  
Average Size ◽  
Β Chain ◽  
Positively Charged

SummaryWe previously described synthetic peptides of 19-21 amino acid residues, homologous to the C-termini of fibrinogen Fib340 and Fib420, from the β-chain (Cβ), the extended αE chain (CαE) and near the end of the γ-chain (preCγ) which elicited attachment (haptotactic) responses from mesenchymal cells. We named these haptotactic peptides -Haptides. The effects of Haptides on fibrin clot formation was evaluated and their possible effects on platelet aggregation was examined. The Haptides Cβ, CαE and preCγ, (2-10 μM) increased fibrin clot turbidity and also decreased thrombin-induced clotting time. Higher concentrations (>120 μM of Cβ or preCγ) induced fibrinogen precipitation even without thrombin. These precipitates exhibited different ultrastructure from thrombin-induced fibrin by scanning and transmission microscopy. C-terminal peptides of the other fibrinogen chains exerted no such effects. Sepharose beads covalently coated with either whole fibrinogen or Haptides (SB-Fib or SB-Haptide) highly adsorbed free FITCHaptides. In aqueous solution, Haptides formed nano-particles with average size of ∼150nm in diameter. We suggest that such positively charged aggregates could serve to nucleate and accelerate fibrin gel formation. These results also indicate that Cβ and preCγ sequences within fibrin(ogen) participate in the docking and condensation of fibrin(ogen) during its assembly into a fibrin clot. By contrast, Haptides up to 100µM did not bind to platelets, and had no effect on platelet aggregation. Our findings highlight the roles of the C-terminal sequences of the β and γ chains in fibrin(ogen) polymerization as well as in cell attachment.

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