Mechanics of Liquid Nano- and Microdispersed Magnetic Media  book cover
1st Edition

Mechanics of Liquid Nano- and Microdispersed Magnetic Media

ISBN 9781138068230
Published August 4, 2017 by CRC Press
210 Pages

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Book Description

This book offers unique coverage of the mechanical properties of nano- and micro-dispersed magnetic fluids. Magnetic fluids are artificially created materials that do not exist in the nature. Researchers developing materials and devices are keenly interested in their "mutually exclusive" properties including fluidity, compressibility, and the ability to magnetize up to saturation in relatively small magnetic fields. Applications of micro- and nanodispersed magnetic fluids include magnetic-seals, magnetically operated grease in friction units and supports, separators of non-magnetic materials, oil skimmers and separators, sensors of acceleration and angle, and gap fillers in loudspeakers.

Table of Contents

Introduction to nanotechnology and microtechnology

Main concepts and definitions used in nano- and micro-technologies

Position of the nano- and micro-objects on the scale of the sizes investigated at the present time

Prefixes to the units of the SI system

Influence of the dimensional effect on the physical properties of materials

The history of development of nanotechnologies and nano-objects

The physical model of the continuous medium

The continuity equation

The equation of motion

The equation of the mechanical state

The elasticity coefficient

The ponderomotive force

The magnetic pressure jump

The mechanics of ‘slipping’ of nano- and microparticles in accelerated movement of the suspension

Measurement of magnetic parameters of nano- and microdispersed media

The magnetic field

Description of experimental equipment and the method for getting the magnetisation curve

The magnetisation curve

Calculation of the ‘maximum’ and ‘minimum’ magnetic moments of nanoparticles and their diameters

The magnetocaloric effect in a nanodispersed magnetic system

Effect of the ponderomotive force

Experimental confirmation of the ponderomotive mechanism of electromagnetic excitation of elastic oscillations in a magnetic fluid

The ponderomotive mechanism of excitation of oscillations in a cylindrical resonator with a magnetic fluid

The Q-factor of a magnetic fluid film – the emitter of elastic oscillations

Excitation of sound in an unlimited magnetic fluid

The coefficient of ponderomotive elasticity of the magnetic fluid membrane

Resonance frequency of oscillations of the magnetic fluid seal

Experimental method for determining the coefficient of ponderomotive elasticity

A magnetic fluid chain with the ponderomotive type elasticity

Rotational oscillations of a linear cluster in a magnetic field

Oscillations of the form of the magnetic fluid droplet

Simple mechanism of volume magnetostriction

Magnetic levitation

Comparison of equilibrium magnetisation of a nanodispersed magnetic fluid and a microdispersed ferrosuspension

Rheological properties of suspensions

Newtonian and non-Newtonian fluids

Magnetorheological effect

Physical nature of the magnetorheological effect

Mechanical and magnetic properties of nanodispersed systems

Equation of the magnetic state of a superparamagnetic

Diffusion of nanoparticles in a fluid matrix

Magnetodiffusion and barodiffusion in nano- and microdispersed media

Aggregative stability of the disperse system of magnetic nanoparticles

Additive model of the elasticity of nano- and microdispersed systems

The additive model of the elasticity of nano- and microdispersed systems taking interphase heat exchange into account

Compressibility of a magnetite–water magnetic fluid

‘Suspending’ a magnetic fluid in a pipe to investigate its rheological properties

The column of the magnetic fluid in a pipe as an inertia –viscous element of the oscillatory system

Rheology of the magnetic fluid with anisotropic properties

Kinetic and strength properties of a magnetic fluid membrane

The cavitation model of the rupture–restoration of the magnetic fluid membrane

Methods for producing magnetic fluids and ferrosuspensions

The production of magnetic fluids with different disperse phases

The method of producing magnetite and magnetic fluids on transformer oil

Laboratory equipment for producing magnetic fluids by chemical condensation

Selection of the dispersion medium

Production of magnetic fluids with microdroplet aggregates

Applications of nano- and microdispersed media

Applications of ferrosuspensions

Using nanodispersed magnetic fluids in science and technology

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Vyacheslav Mikhailovich Polunin has been working in the Physics Department of Southwest State University in Kursk (Russia) for 40 years: as a senior lecturer, reader, and currently heads the department. He earned his PhD in physics from the Leningrad State University in Saint Petersburg, Russia. Dr. Polunin’s research interests include molecular physics, physical acoustics, and magnetohydrodynamics. He is also the author or co-author of nearly 350 scientific publications in Russian national science journals and many European countries. Dr. Polunin holds 15 author’s certificates and patents.