Steady Shear Rheology and Magnetic Properties of Flake-Shaped Iron Particle-Based MR Fluid: Before and After Tribology Study

2019 ◽  
Vol 49 (6) ◽  
pp. 820-828 ◽  
Author(s):  
Ramesh V. Upadhyay
Keyword(s):  
Magnetic Properties ◽  
Iron Particle ◽  
Steady Shear ◽  
Mr Fluid ◽  
Shear Rheology ◽  
Before And After

The Production and Properties of Copper-Iron Particulate Composite Wire

1989 ◽  
Vol 203 (3) ◽  
pp. 175-184
Author(s):  
G I Lawal ◽  
D C Barton ◽  
A N Bramley ◽  
J Nutting
Keyword(s):  
Magnetic Properties ◽  
Structural Changes ◽  
Copper Wire ◽  
Particulate Composite ◽  
Iron Particle ◽  
Composite Wire ◽  
Particulate Form ◽  
Increasing Process ◽  
The Wire ◽  
Magnetic Hardness

A novel means of producing copper-based powder metallurgy wire containing sufficient iron in particulate form to impart useful magnetic properties has been investigated. The method, which involves encapsulating a powder mixture within a copper tube prior to rolling and die-drawing operations, has been successfully used to produce composite wire of diameter range 1.8-0.4 mm. Particular attention has been paid to the effect of composition, processing strain, heat treatment and iron particle size on the electrical, mechanical and magnetic properties of the wire. Microscopy studies have also been carried out to determine structural changes in the material during processing. It was found that the good conductivity and ductility of solid copper wire was not greatly reduced provided (a) the iron content of the composite wire was kept fairly low (<6 per cent) and (b) the annealing temperature was not sufficiently high for significant alloying to take place (650°C maximum). Saturation magnetization values increased with increasing process strain, as did the magnetic hardness. The latter, however, could be minimized by fully annealing the iron after processing the wire. The magnetic properties were undoubtedly influenced by the size and shape of the iron particles, smaller particles being more easily elongated and tending to give greater magnetic hardness.

Steady shear rheology of dilute polystyrene particle gels

1999 ◽  
Vol 38 (4) ◽  
pp. 257-267 ◽  
Author(s):  
Rudy Folkersma ◽  
Alois J. G. van Diemen ◽  
Jozua Laven ◽  
Hans N. Stein
Keyword(s):  
Steady Shear ◽  
Polystyrene Particle ◽  
Shear Rheology

Adhering magnetic molecules to surfaces

2015 ◽  
Vol 3 (46) ◽  
pp. 11986-11998 ◽  
Author(s):  
Rebecca J. Holmberg ◽  
Muralee Murugesu
Keyword(s):  
Magnetic Properties ◽  
Single Molecule ◽  
Molecular Design ◽  
Surface Interaction ◽  
Single Molecule Magnets ◽  
Magnetic Molecules ◽  
Before And After

In this review we aim to present an overview of the work that has been performed on attaching and studying Single-Molecule Magnets (SMMs) on various surfaces, with an emphasis on molecular design for surface interaction and on the magnetic properties before and after adhesion occurs.

Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions

2018 ◽  
Vol 57 (4) ◽  
pp. 293-306 ◽  
Author(s):  
Francesco Del Giudice ◽  
Benjamin V. Cunning ◽  
Rodney S. Ruoff ◽  
Amy Q. Shen
Keyword(s):  
Graphene Oxide ◽  
Steady Shear ◽  
Shear Rheology

Steady shear rheology of entangled polymer liquids: Implications of interfacial slip

2002 ◽  
Vol 46 (5) ◽  
pp. 1239-1262 ◽  
Author(s):  
Javier Sanchez-Reyes ◽  
Lynden A. Archer
Keyword(s):  
Steady Shear ◽  
Interfacial Slip ◽  
Shear Rheology ◽  
Polymer Liquids ◽  
Entangled Polymer

Effect of separated layer thickness on magnetoresistance and magnetic properties of Co/Dy/Co and Ni/Dy/Ni film systems

2018 ◽  
Vol 32 (01) ◽  
pp. 1750275 ◽  
Author(s):  
T. M. Shabelnyk ◽  
O. V. Shutylieva ◽  
S. I. Vorobiov ◽  
I. M. Pazukha ◽  
A. M. Chornous
Keyword(s):  
Magnetic Properties ◽  
Layer Thickness ◽  
Phase State ◽  
Diffusion Processes ◽  
Hysteresis Loops ◽  
Before And After ◽  
Beam Sputtering ◽  
Diffraction Patterns ◽  
20 Nm ◽  
And Diffusion

Co(5 nm)/Dy(t[Formula: see text])/Co(20 nm)/S and Ni(5 nm)/Dy(t[Formula: see text])/Ni(20 nm)/S trilayer films are prepared by electron-beam sputtering to investigate the influence of dysprosium layer thickness (t[Formula: see text]) and thermal annealing on the crystal structure, magnetoresistance (MR) and magnetic properties of thin films. The thickness of Dy layer changed in the range from 1 nm to 20 nm. The samples annealed for 20 min at 700 K. Electron diffraction patterns reveal that the as-deposited and annealed systems Co/Dy/Co and Ni/Dy/Ni had fcc-Co + hcp-Dy and fcc-Ni + hcp-Dy phase state, respectively. It is also shown that at the t[Formula: see text] = 15 nm the transition from amorphous to crystalline structures of Dy layer is observed. An increase in the Dy layer thickness results in changes in the MR and magnetic properties of the trilayer systems. It is shown that MR is most thermally stable against annealing to 700 K at t[Formula: see text] = 15 nm for Co/Dy/Co as well as for Ni/Dy/Ni. For t[Formula: see text] = 15 nm the, value of MR for both system increases by two times compared to those of pure ferromagnetic (FM) samples. The coercivity (B[Formula: see text]), remanent (M[Formula: see text]) and saturation (M[Formula: see text]) magnetization of the in-plain magnetization hysteresis loops are related to the Dy layer thickness too. The coercivity depends on the FM materials type and diffusion processes at the layer boundary. Accordingly, M[Formula: see text] and M[Formula: see text] are reduced with t[Formula: see text] increasing before and after annealing for both trilayer systems.

The Effects of Ternary Elemental Additions on the Structure and Magnetic Properties of Nanocrystalline Feco Powders

2002 ◽  
Vol 753 ◽  
Author(s):  
I. Baker ◽  
R. G. Quiller ◽  
M. Robson ◽  
D. Wu
Keyword(s):  
Magnetic Properties ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grain Sizes ◽  
Before And After ◽  
Diffraction Peaks ◽  
Computer Controlled ◽  
Steel Balls ◽  
Scanning Electron

ABSTRACTPowders of near-equiatomic Fe and Co were mechanically milled with additions of Zr, C, Ni, Cu and/or B for 60 hr using stainless steel balls in a Svegari attritor operated at 1300 r.p.m. under argon. The milled powders were examined before and after annealing at 600 °C. The morphologies and sizes of the powders were examined using a scanning electron microscope. The grain sizes were characterized from the widths of X-ray diffraction peaks obtained using a computer-controlled x-ray diffractometer and the lattice parameters were determined. The resulting magnetic properties were measured using a vibrating sample magnetometer.

scholarly journals Effects of heat treatment on the magnetic properties of polymer-bound iron particle cores

1998 ◽  
Vol 83 (11) ◽  
pp. 6474-6476 ◽  
Author(s):  
M. Namkung ◽  
B. Wincheski ◽  
R. G. Bryant ◽  
A. Buchman
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Iron Particle
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