scholarly journals The Magnetic Properties of Textured Fine Particle Systems

1989 ◽  
Vol 11 (2-4) ◽  
pp. 107-125 ◽  
Author(s):  
R. W. Chantrell
Keyword(s):  
Magnetic Properties ◽  
Fine Particle ◽  
Fine Particles ◽  
Solid Dispersions ◽  
Magnetic Fluids ◽  
Particle Systems ◽  
Recording Media ◽  
Angular Dispersion ◽  
Texture Characteristic

The magnetic properties of fine particle systems are strongly dependent on two types of texture. The first is an orientational texture characteristic of the angular dispersion of the easy anisotropy axes and the second is a spatial texture characteristic of the physical microstructure of the system. The effects of texture on the properties of both fluid and solid dispersions of fine particles can be very pronounced. The paper reviews some recent studies illustrating these effects, with particular emphasis on the behaviour of recording media and magnetic fluids.

Magnetic properties of spindle-type iron fine particles obtained from hematite

2001 ◽  
Vol 226-230 ◽  
pp. 1933-1935 ◽  
Author(s):  
L.C. Varanda ◽  
M. Jafelicci ◽  
G.F. Goya
Keyword(s):  
Magnetic Properties ◽  
Fine Particles

Application of Ceramic Membrane Technology in Tungsten Fine Particle Concentration Process

2014 ◽  
Vol 692 ◽  
pp. 191-199
Author(s):  
Wan Fu Huang ◽  
Xiao Feng Wang ◽  
Xin Dong Li ◽  
Si Ming Yan
Keyword(s):  
Fine Particle ◽  
Particle Concentration ◽  
Fine Particles ◽  
Ceramic Membrane ◽  
Membrane Technology ◽  
Factors Affecting ◽  
Membrane Flux ◽  
Concentration Test ◽  
Optimal Effect ◽  
Membrane Concentration

This study used ceramic membrane technology to concentrate tungsten fine particles for its inefficient recycling issue. Factors affecting the membrane concentration test were discussed, and the results show that: under the feed flow of 7000 mL/min, concentration time of 3 hours, and concentration liquid flow of 500 mL/min, it is the optimal effect of ceramic membrane concentration tungsten fine particle, which the interception rate reaches more than 99%, the membrane permeation flux can be nearly reach 470mL/(min×1099cm2) above, and concentrate concentration can be basically stable at around 29% . Ceramic membrane flux recovery rate can be as high as 93% by 7 minutes backwashing firstly and then 2 minutes forward cleaning.

EFFECT OF AMMONIA SOLUTION ON COMPOSITION, STRUCTURE AND MAGNETIC PROPERTIES OF CHEMICALLY PREPARED Co-B NANO-PARTICLES

2012 ◽  
Vol 05 ◽  
pp. 134-141
Author(s):  
HOOMAN SABAROU ◽  
ABOLGHASEM ATAIE
Keyword(s):  
Magnetic Properties ◽  
Boron Content ◽  
Fine Particles ◽  
Chemical Reduction ◽  
Amorphous Structure ◽  
Ammonia Solution ◽  
Nano Particles ◽  
Reagent Solution ◽  
Sem Images ◽  
Composition Structure

In this study, the effect of ammonia solution addition as a pH adjusting component on the thermal behavior, phase composition, morphology, and magnetic properties of reduced Co - B nano-particles fabricated by chemical reduction route have been studied using DSC, XRD, SEM, and VSM techniques, respectively. Chemical composition of the samples was measured by ICP. The ICP results showed that basic pH of reagent solution, derived from utilizing ammonia solution, caused the boron content to decrease. XRD results indicated an amorphous structure for both samples synthesized with and without ammonia solution. Analysis of the DSC results showed that crystallization behavior has dramatically altered, owing to utilize ammonia solution. While the sample synthesized without ammonia solution showed three distinctive exothermic peaks at 216,470, and 540°C, the sample synthesized in the presence of ammonia solution exhibited only two exothermic peaks at 235 and 470°C and one endothermic peak at 370°C. SEM images reveal that the samples have a net- like morphology and the net is formed by many interconnected spherical fine particles with sizes less than 100 nm. Saturation magnetization of the sample synthesized in the presence of ammonia solution has improved significantly, probably due to the less amount of boron.

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