Mechanism of the autowave process in a thin layer of colloidal solution of magnetic nanoparticles in liquid dielectric

2020 ◽  
Author(s):  
Vladimir Chekanov ◽  
Elena Diskaeva
Keyword(s):  
Magnetic Nanoparticles ◽  
Thin Layer ◽  
Colloidal Solution ◽  
Liquid Dielectric ◽  
Autowave Process

scholarly journals Mathematical Modeling of Autowave Process in a Thin Layer of Magnetic Colloid

2020 ◽  
Vol 17 (4) ◽  
pp. 57-67
Author(s):  
V.S. Chekanov ◽  
◽  
A.V. Kovalenko ◽  
E.N. Diskaeva ◽  
E.V. Kirillova ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Thin Layer ◽  
Autowave Process

Fusion Technology Nanopowder Magnetic Fluids

2017 ◽  
Vol 265 ◽  
pp. 198-203
Author(s):  
S.I. Evdokimov ◽  
E.I. Meshkov ◽  
T.E. Gerasimenko
Keyword(s):  
Magnetic Nanoparticles ◽  
Large Scale ◽  
Colloidal Solution ◽  
Organic Liquid ◽  
Mining Industry ◽  
Magnetic Fluids ◽  
Building Blocks ◽  
Inhomogeneous Magnetic Field ◽  
Magnetic Nanomaterials ◽  
Emerging Industries

Magnetic nanomaterials play an important role in emerging industries, specializing in the study of objects (natural or artificially synthesized) with nanoscale building blocks. The wide use of magnetic nanomaterials (especially for biological applications) is constrained by the following reasons: difficulties in obtaining monodisperse ferromagnet particles with stable reproducible characteristics, high cost of large-capacity production However, nanomaterials with magnetic properties are increasingly used in everyday practice. Some companies have already established the production of the first samples of nanomaterials. The time to conduct of a large-scale search for the ways of practical use of magnetic materials has come. Ferrofluids or so-called magnetic fluids are suspensions of magnetic nanoparticles stabilized with a surfactant, in liquid media. Magnetite and ferrites can act as the magnetic phase in the ferrofluids. The liquid phase is water or an organic liquid. The dimensions of the magnetic nanoparticles are 5-10 nm. The market supplied magnetic fluids contain mostly magnetite. Such magnetic fluids are used as a separation medium, polarized external inhomogeneous magnetic field in the gold mining industry to recover the fractions containing 90-97% native gold. A method for the preparation of a colloidal solution with a narrow distribution of magnetite particles according to the size by the heterogeneous condensation method according to R. Zigmondi has been developed. Condensation is carried out on seeds, which is brought into the solution of nanoparticles of magnetite. Getting monodisperse sol is achieved by injecting a concentrated solution of one component in a very dilute solution of another, with vigorous stirring (typically Veimarn). A method called "double additive" proposed G.J. Fleer and J. Lyklema is used to stabilize the sol. The method reduces to the fact that the source unprotected magnetite sol stabilizer is added to a certain volume of a colloidal solution of magnetite, on the surface of which stabilizer is physically and chemically sorbed.

scholarly journals Autowave process in a thin layer of magnetodielectric emulsion

2021 ◽  
Vol 1967 (1) ◽  
pp. 012010
Author(s):  
V S Chekanov ◽  
Yu I Dikansky
Keyword(s):  
Thin Layer ◽  
Autowave Process

Applications of Photoelectron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 506-507
Author(s):  
William J. Baxter
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Chemical Composition ◽  
Ultraviolet Radiation ◽  
Thin Layer ◽  
Edge Effects ◽  
Electron Optics ◽  
Surface Layers ◽  
Crystalline Orientation ◽  
Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

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