Effect of carrier liquid on electrorheological performance and stability of oxalate group-modified TiO2 suspensions

2017 ◽  
Vol 32 (4) ◽  
pp. 854-861 ◽  
Author(s):  
Ning Ma ◽  
Xufeng Dong
Keyword(s):  
Carrier Liquid ◽  
Oxalate Group

A magnetic super lattice

1987 ◽  
Vol 45 ◽  
pp. 360-361 ◽  
Author(s):  
M.D. Bentzon ◽  
J. v. Wonterghem ◽  
A. Thölén
Keyword(s):  
Thermal Decomposition ◽  
Oleic Acid ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Carbon Film ◽  
Thick Layer ◽  
Amorphous Iron ◽  
Super Lattice ◽  
Carrier Liquid ◽  
Median Diameter

We report on the oxidation of a magnetic fluid. The oxidation results in magnetic super lattice crystals. The “atoms” are hematite (α-Fe2O3) particles with a diameter ø = 6.9 nm and they are covered with a 1-2 nm thick layer of surfactant molecules.Magnetic fluids are homogeneous suspensions of small magnetic particles in a carrier liquid. To prevent agglomeration, the particles are coated with surfactant molecules. The magnetic fluid studied in this work was produced by thermal decomposition of Fe(CO)5 in Declin (carrier liquid) in the presence of oleic acid (surfactant). The magnetic particles consist of an amorphous iron-carbon alloy. For TEM investigation a droplet of the fluid was added to benzine and a carbon film on a copper net was immersed. When exposed to air the sample starts burning. The oxidation and electron irradiation transform the magnetic particles into hematite (α-Fe2O3) particles with a median diameter ø = 6.9 nm.

Evaporation and pervaporation of a binary mixture from an inert carrier liquid

1988 ◽  
Vol 11 (1) ◽  
pp. 384-391 ◽  
Author(s):  
Thomas Riede ◽  
Ernst Ulrich Schlünder
Keyword(s):  
Binary Mixture ◽  
Carrier Liquid ◽  
Inert Carrier

Digital printing of mortar in carrier liquid: comparison of approaches to predict print stability

2021 ◽  
Vol 54 (3) ◽  
Author(s):  
Abdeslam Benamara ◽  
Alexandre Pierre ◽  
Abdelhak Kaci ◽  
Yannick Melinge
Keyword(s):  
Digital Printing ◽  
Carrier Liquid

scholarly journals The Effect of Dielectric Polarization Rate Difference of Filler and Matrix on the Electrorheological Responses of Poly(ionic liquid)/Polyaniline Composite Particles

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 703 ◽  
Author(s):  
Chen Zheng ◽  
Qi Lei ◽  
Jia Zhao ◽  
Xiaopeng Zhao ◽  
Jianbo Yin
Keyword(s):  
Ionic Liquid ◽  
Electric Fields ◽  
Flow Behavior ◽  
Composite Particles ◽  
Dielectric Polarization ◽  
Rate Difference ◽  
Polarization Rate ◽  
Carrier Liquid ◽  
Poly Ionic Liquid ◽  
Stable Flow

By using different conductivity of polyaniline as filler, a kind of poly(ionic liquid)/polyaniline composite particles was synthesized to investigate the influence of dielectric polarization rate difference between filler and matrix on the electrorheological response and flow stability of composite-based electrorheological fluids under simultaneous effect of shear and electric fields. The composite particles were prepared by a post ion-exchange procedure and then treated by ammonia or hydrazine to obtain different conductivity of polyaniline. Their electrorheological response was measured by dispersing these composite particles in insulating carrier liquid under electric fields. It showed that the composite particles treated by ammonia had the strongest electrorheological response and most stable flow behavior in a broad shear rate region from 0.5 s−1 to 1000 s−1. By using dielectric spectroscopy, it found that the enhanced electrorheological response with stable flow depended on the matching degree of the dielectric polarization rates between poly(ionic liquid) matrix and polyaniline filler. The closer their polarization rates are, the more stable the flow curves are. These results are helpful to design optimal composite-based electrorheological materials with enhanced and stable ER performance.

Encapsulation of Carbonyl Iron Particles with Poly(Vinyl Butyral) and their Magnetorheology

2007 ◽  
Vol 334-335 ◽  
pp. 193-196
Author(s):  
Jae Lim You ◽  
B.J. Park ◽  
I.B. Jang ◽  
Hyoung Jin Choi
Keyword(s):  
Magnetic Field ◽  
Carbonyl Iron ◽  
Magnetic Particles ◽  
Mineral Oil ◽  
Iron Particles ◽  
Carrier Liquid ◽  
Mr Fluids ◽  
Fluid Systems ◽  
Ft Ir ◽  
Vinyl Butyral

To enhance dispersion stability of magnetorheological (MR) fluids, hybrid magnetic particles of carbonyl iron (CI)/ poly(vinyl butyral) (PVB) with core/shell microstrcutre (CI-PVB) were prepared, since pure magnetic CI based MR fluid systems show severe sedimentation of the CI particles due to the large density mismatch with the carrier liquid and difficulties in redispersion after caking. The composite particles of CI-PVB have a lower density than that of the pure CI particles, while exhibiting almost original magnetic property of the CI. Both CI and CI-PVB particles were dispersed in mineral oil (20 vol%) and their MR characteristics were examined via a rotational rheometer with a magnetic field supplier. Various characterizations of the CI-PVB particles were performed via SEM, TEM and FT-IR. Both yield stress and flow curve of shear stress as a function of shear rate of the MR fluids were investigated under applied magnetic field strengths.

Preliminary Research on the Post Treatment of Fluid Magnetic Abrasivetool

2010 ◽  
Vol 455 ◽  
pp. 161-164
Author(s):  
W.D. Li ◽  
Ming Lv ◽  
Sheng Qiang Yang
Keyword(s):  
Carbonyl Iron ◽  
Magnetic Particles ◽  
Post Treatment ◽  
Working Time ◽  
Iron Particles ◽  
Abrasive Particles ◽  
Carrier Liquid ◽  
Preliminary Research

Fluid magnetic abrasivetool(FMA) is one kind of latest finishing abrasivetool which is a sort of suspended fluid composed by magnetic particles, nonmagnetic abrasive particles, surfactants in a non-magnetizable carrier liquid. After a period of working time, the performance-life of the abrasivetool ended because of the cutting- blade of the abrasives particles being passive. While the most costly component- the magnetic particles (carbonyl iron particles) can be reused. This paper has made up two recovery flows to separated carbonyl iron particles from others.

Synthesis and electrorheological properties of oxalate group-modified amorphous titanium oxide nanoparticles

2010 ◽  
Vol 288 (18) ◽  
pp. 1739-1744 ◽  
Author(s):  
Fenghua Liu ◽  
Gaojie Xu ◽  
Jinghua Wu ◽  
Yuchuan Cheng ◽  
Jianjun Guo ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Oxide Nanoparticles ◽  
Titanium Oxide Nanoparticles ◽  
Oxalate Group ◽  
Electrorheological Properties

Fluid Magnetic Abrasives Based on Micron-Sized Carbonyl-Iron Particles and Its Applications in the Precision Finishing Process

2007 ◽  
Author(s):  
Huanwu Sun ◽  
Shichun Yang
Keyword(s):  
Carbonyl Iron ◽  
Magnetic Particles ◽  
Iron Particles ◽  
Typical Size ◽  
Carrier Liquid ◽  
Finishing Process ◽  
New Type ◽  
Preparation Techniques ◽  
Precision Finishing ◽  
Magnetic Abrasives

The fluid magnetic abrasive (FMA) is a new type of precision finishing abrasives, which is typically prepared by dispersing the magnetic particles, nonmagnetic abrasives, surfactants in a non-magnetizable carrier liquid. As the functional particles, the characteristics of magnetic particles have a great impact on the properties of FMA. In our experiment, the micron-sized carbonyl-iron (CI) particles (typical size: 3 μm–5 μm) are found to be ideally suited for the preparation of FMA. In this paper, the selections of micron-sized carbonyl-iron particles suitable for the FMA, the preparation techniques, the finishing mechanism and finishing process are presented. Some key parameters of FMA that may affect the finishing efficiency and the final surface roughness are analyzed theoretically. The experimental results are discussed as well in this paper.

A Note on the China-Film Technique for Boundary Layer Indication

1956 ◽  
Vol 60 (548) ◽  
pp. 543-544
Author(s):  
R. J. Stalker
Keyword(s):  
Flow Direction ◽  
Air Flow ◽  
Vertical Surface ◽  
Surface Shear Stress ◽  
Surface Shear ◽  
Carrier Liquid ◽  
China Clay ◽  
Yield Information ◽  
Volatile Liquid ◽  
Order Of Magnitude

The “ China-Film ” technique was developed by Murphy and Phinney from the “ China Clay” technique for indicating transition originated by Richards and Burstall. It consists in applying a suspension of china clay in a volatile liquid to a surface subsequently subjected to air flow. Not only is transition indicated, but when all the liquid has evaporated, the china clay remains deposited on the surface in patterns which may be interpreted to yield information on the direction of air flow near the surface and the incidence of shocks thereon.Experiments were carried out, at supersonic and subsonic air speeds, to determine the process by which the patterns form and to establish the aerodynamic meaning of the “ flow lines ” of the pattern. The influence of the viscosity of the carrier liquid was also studied. Indications of flow direction were found to be unreliable near a trailing edge, on a vertical surface at low speeds and in regions where the surface shear stress is only of the same order of magnitude as the product of pressure gradient and film thickness.

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