Magnetic rotary microrheology in a Maxwell fluid
- 作者：Yu.L. Raikher and V.V. Rusakov
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2006
- 期刊代码：31_03048853
- 类别：ph
- 出版时间：May 2006
- 卷：300
- 期：1
- 页码：e229-e233
- 文件大小：144 K
摘要
A ferroparticle driven by an AC field in a Maxwell fluid is studied with regard to magnetic microrheology. Orientational kinetics is simplified by neglecting the particle rotary inertia. While in a Newtonian fluid the inertialess approximation for nanoparticles is valid practically unboundedly, in a viscoelastic matrix there exists an important restriction on the stress relaxation time. Assuming weak non-equilibrium, the magneto-orientational relaxation times and low-frequency magnetic spectra are found in the presence of a constant (bias) field. Another way of particle-mediated probing of the matrix involves the field-induced birefringence of a suspension; under zero bias field the corresponding (quadratic) susceptibility is found.