Magnetoviscous effects in ferrofluids

Lecture Notes in Physics: Monographs 71......Page 1
Magnetoviscous Effects
in Ferrofluids......Page 3
Preface......Page 5
Contents......Page 9
1.1 Magnetic fluids......Page 11
1.2 Magnetoviscous effects......Page 12
1.3 Publications on ferrofluids......Page 13
1.4 The scope of this work......Page 14
2. Magnetic fluids......Page 17
2.1 Basic structure and stability......Page 18
2.2.1 Equilibrium magnetization......Page 24
2.2.2 Relaxation of magnetization......Page 30
2.3 Viscous properties in the absence of magnetic fields......Page 32
2.4.1 Mechanical applications......Page 36
2.4.2 Thermal applications......Page 37
2.4.3 Medical applications......Page 38
2.4.4 Aspects for the design of future applications......Page 39
2.4.5 Applications and the magnetoviscous effect......Page 41
3. The magnetoviscous effect in highly diluted ferrofluids......Page 0
3.1 Rotational viscosity......Page 45
3.2 "Negative" viscosity......Page 62
4.1 Magnetoviscous effects in commercial fluids at high shear rate......Page 69
4.2.1 Capillary viscometers......Page 72
4.2.2 Rheometers......Page 74
4.2.3 A specialized rheometer for the study of magnetoviscous effects in ferrofluids......Page 78
4.3.1 Results for a commercial ferrofluid and a first approach to a microscopic explanation......Page 88
4.3.2 Experimenta results fo fluids with different microscopic make-up......Page 95
4.3.3 Controlled change of the microscopic make-up of commercial ferrofluids......Page 103
4.3.4 Microscopic explanation of magnetoviscosity in fluids with interparticle interaction......Page 106
4.3.5 Rheological description of magnetoviscosity......Page 112
4.4 Viscoelastic effects in ferrofluids......Page 117
4.4.1 Normal stress differences in magnetic fluids......Page 118
5.1 Definition and basic properties......Page 133
5.2 Viscous properties of magnetorheological fluids......Page 135
5.3 Future development in magnetorheology......Page 137
Appendix A......Page 145
List of symbols......Page 147
References......Page 153