Elastic moduli magnetic-field dependence

In Sect. 3.2 the preparation of magnetic polymer composites under uniform magnetic field has been described. The resulting composites show anisotropic behavior. The anisotropy manifests itself in the direction-dependent elastic modulus. Figure 13 shows carbonyl iron-loaded mPDMS elastomers. All three samples contain the same amount of filler particles, but the spatial distribution of the filler is different, as shown in the figure. 

When the stress and the strain are parallel (Fig. 21b), a coil is used to create the magnetic field. In this case, we were able to measure the stress-strain dependence at O-lOOmT. In the experiments, the magnetic field intensity was varied and the elastic modulus was measured as a function of magnetic induction, B. 

Fig. 22 Dependence of the magnetic field intensity on the elastic modulus for mPDMS containing different amounts of randomly distributed magnetite particles. The concentrations of the filler particles are indicated in the figure...

Fig. 24 Dependence of the magnetic field intensity on the elastic modulus. The arrangements of the particles in the polymer networks are parallel to the applied mechanical stress while the applied uniform magnetic field is parallel (a) or perpendicular (b) to the columnar structure. The concentration of the carbonyl iron particles in the mPDMS matrix is indicated...

Fig. 1 Dependence of elastic (storage) modulus (G = GI), loss modulus (G = GII) and loss tangent (tan5) of MRE samples containing CIP (prepared in and without the presence of magnetic field) on strain frequency...

Detection of fine changes in the temperature dependencies of creep, relaxation dynamics, and elastic modulus values in polymers caused by different treatments or external influences. The latter include various thermal treatments pre-straining or another mechanical actions the impact of irradiation or magnetic field, etc. 

Figure 17.7 (a) Field-dependent magnetization of CoFe O -BC shows increase in saturation magnetization with increase in total concentration of Fe and Co + ions in the precursor, (b) Stress Vs strain curve obtained under compression shows higher elastic modtdus for magnetic nanopaper, whereas lower elastic modulus in the case of magnetic aerogel. 

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