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Chapter
Thermodynamics, Electrodynamics, and Ferrofluid Dynamics
Applying thermodynamics consistently and in conjunction with other general principles (especially conservation laws and transformation properties) is shown in this review to lead to useful insights and unambig...
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Article
Rotational viscosity in ferrofluids
We have measured the rotational viscosity ηr of a concentrated ferrofluid by observing the increase of critical angular velocity in a Taylor cell with two different magnetic field configurations. The results are ...
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Article
Rotational viscosity of ferrofluids and the Taylor instability in a magnetic field
We have measured the rotational viscosity Δη of a concentrated ferrofluid by observing the increase of the first critical angular velocity in a Taylor cell with longitudinal magnetic field. The method is suitable...
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Article
Discrete particle size distribution in ferrofluids
We present a method to obtain stable discrete particle size distributions from the room temperature magnetization curves of ferrofluids. This method has been successfully applied to a hydrocarbon base magnetit...
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Article
Magnetoviscosity of concentrated ferrofluids
We investigated a concentrated hydrocarbon base magnetite ferrofluid (saturation magnetization 2.9·104 A/m) and present experimental data for magnetization and magnetoviscosity. The results can be understood afte...
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Article
Der Einfluß der Kopplung von Barkhausen-Sprüngen auf deren Größenverteilung
The size distribution of Barkhausen discontinuities was investigated in poly-crystalline nickel as a function of coercive force (2.1≦H c ≦17.0 Oe), demagnetizing factor (0.0316≦
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Article
Die Temperaturabhängigkeit der magnetischen Jordan-Nachwirkung von Nickel
The magnetic after effect of pure polycristalline nickel and of a single crystal was measured between −196 and +340 °C by a Förster second harmonic magnetometer. The viscosity constantS v ...
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Article
Die Temperaturabhängigkeit des magnetischen Barkhausen-Effekts IV
The size distribution of Barkhausen discontinuities (magnetic moment > 6.5 · 10−7 cgs) of very pure nickel was measured between −195 and 360 °C on the hysteresis loop. The mean value of internal stresses was chan...
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Article
Über den Barkhausen-Effekt
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Article
Der Einflu\ unipolarer elektrischer Ladungen auf die Beweglichkeit von natürlichem Aerosol
The size distribution of natural occuring aerosol particles with radii from 10−6 to 10−5 cm was measured by investigation of the distribution of thoron decay products on the mobility spectrum. In addition we used...
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Article
Das Größenspektrum des natürlichen atmosphärischen Aerosols
The size distribution of natural occuring aerosol particles with a radius between 10−5 and 10−6cm was measured simultaneously by two different methods: Firstly the measurement of the current, caused by the natura...
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Article
Die Temperaturabhängigkeit des magnetischen Barkhauseneffekts
The size distribution of Barkhausen discontinuities (magnetic momentM>5·10−7cgs) of a very pure, hard drawn nickel specimen was measured between −170 und +360 °C on the curve of initial magnetization and on the h...
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Article
Die Temperaturabhängigkeit des magnetischen Barkhausen-Effekts. I
The apparatus described allows to measure the size distribution of Barkhausen discontinuities with a magnetic moment greater than 10−6 e.m.u. in a temperatur range from liquid air up to the Curie point. We used t...
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Article
Die Temperaturabhängigkeit des magnetischen Barkhausen-Effekts. II
The size distribution of Barkhausen discontinuities was measured during “thermal idealisation” of a hard drawn nickel specimen. Thermal idealisation means the magnetization by increasing temperature in a const...
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Article
Die Verteilung der natürlichen Radioaktivität auf das Größenspektrum des natürlichen Aerosols
The apparatus described allows to measure the distribution of natural radioactivity on aerosol particles. Careful measures were taken that the aerosol concentration and its size spectrum were not altered befor...
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Article
Zusammensetzung und Eigenschaften des natürlich radioaktiven Aerosols
The influence of an electrical field, acting on the deposition of natural radioactive aerosols was investigated. At an over-all aerosol concentration of 104 particles pro cm3 only 3% of the Ra-A-activity exists i...
