scholarly journals Low density magnetic silicate-nickel alloy composite hollow structures: seed induced direct assembly fabrication and catalytic properties

RSC Advances ◽  
2020 ◽  
Vol 10 (58) ◽  
pp. 35287-35294
Author(s):  
Gaiping Du ◽  
Bin Liao ◽  
Ran Liu ◽  
Zhenguo An ◽  
Jingjie Zhang
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Nickel Alloy ◽  
Catalytic Properties ◽  
Catalytic Reduction ◽  
Low Density ◽  
Alloy Composite ◽  
Hollow Structures ◽  
Reduction Activity ◽  
Direct Assembly

Synthesized HMSC–NiCoP-2.68 wt% catalyst exhibits excellent catalytic reduction activity of 4-NP, which can be separated by self-floating and external magnetic field.

Improvement on Temperature-Sensing Property of Low-Density Polyethylene Based PTC Composites with Static Magnetic Field Treatment

2011 ◽  
Vol 393-395 ◽  
pp. 139-143
Author(s):  
Bao Zhong Han ◽  
Feng Lian Ma ◽  
Chang Ming Li
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Nickel Powder ◽  
Positive Temperature Coefficient ◽  
Temperature Sensing ◽  
Low Density Polyethylene ◽  
Room Temperature Resistivity ◽  
Low Density ◽  
Positive Temperature ◽  
Magnetic Field Treatment

A stable magnetic field was applied during hot press molding of low-density polyethylene (LDPE)/carbon black (CB)/ carbon nanotube (CNT) composites and HDPE/CB/nickel powder composites. The effect of magnetic field treatment on the temperature-sensing property of LDPE-based positive temperature coefficient (PTC) composites was investigated. Experimental results indicate that the magnetic field treatment can lead to an alignment of CNT and nickel powder in LDPE along the direction of the applied external magnetic field. The alignment of these filler particles can endow the composites with low room-temperature resistivity and high PTC intensity when the concentration of CB is decreased. The alignment also can significantly improve mechanical property and processability of the composites. Compared with CNT, nickel powder with strong magnetism has more sensitive response to external magnetic field and is much easier to align in LDPE. Addition of nickel powder is beneficial for developing PTC composites with excellent comprehensive properties.

scholarly journals Synthesis of Bimetallic Gold-Silver (Au-Ag) Nanoparticles for the Catalytic Reduction of 4-Nitrophenol to 4-Aminophenol

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 412 ◽  
Author(s):  
Nurafaliana Berahim ◽  
Wan Basirun ◽  
Bey Leo ◽  
Mohd Johan
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Ag Nanoparticles ◽  
Catalytic Properties ◽  
Catalytic Reduction ◽  
Direct Impact ◽  
Reduction Activity ◽  
Relative Composition ◽  
Catalytic Nanoparticles ◽  
Gold Silver

Bimetallic gold-silver nanoparticles as unique catalysts were prepared using seed colloidal techniques. The catalytic capabilities of the nanoparticles were ascertained in the reduction of 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride. Our results clearly showed that the rate of 4-NP reduction to 4-AP increased with a corresponding decrease in the diameter of the bimetallic NPs. The Au-Ag nanoparticles prepared with 5.0 mL Au seed volume indicated higher reduction activity, which was approximately 1.2 times higher than that of 2.0 mL Au seed volume in the reductive conversion of 4-NP to 4-AP. However, the monometallic NPs showed relatively less catalytic activity in the reductive conversion of 4-NP to 4-AP compared to bimetallic Au-Ag nanoparticles. Our studies also reinforced the improved catalytic properties of the bimetallic Au-Ag nanoparticles structure with a direct impact of the size or diameter and relative composition of the bimetallic catalytic nanoparticles.

Nyquist diagrams for low-frequency oscillations in a non-uniform magnetoplasma

1968 ◽  
Vol 2 (2) ◽  
pp. 135-143 ◽  
Author(s):  
Bruno Bertotti ◽  
Aldo Nocentini
Keyword(s):  
Magnetic Field ◽  
Dispersion Relation ◽  
External Magnetic Field ◽  
Temperature Gradient ◽  
Low Frequency ◽  
Larmor Radius ◽  
Low Density ◽  
Langmuir Waves ◽  
Local Dispersion ◽  
Low Frequency Oscillations

A modification of the Penrose criterion is applied to the local dispersion relation for low-frequency, electrostatic instabilities in a low-density, slightly inhomogeneous magnetoplasma. The Nyquist diagrams obtained can be classified according to their behaviour near the origin; this is sufficient in some cases to conclude that the equilibrium is unstable. With this method, in the limit of negligible ion Larmor radius, we find that the Langmuir waves propagating in a direction orthogonal to the external magnetic field are driven unstable by a temperature gradient.

RECOIL IMPLANTATION MÖSSBAUER EXPERIMENT ON 57Fe IN Ge IN THE PRESENCE OF AN EXTERNAL MAGNETIC FIELD

1980 ◽  
Vol 41 (C1) ◽  
pp. C1-445-C1-445
Author(s):  
G. Langouche ◽  
N. S. Dixon ◽  
L. Gettner ◽  
S. S. Hanna
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Recoil Implantation
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