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Magnetite FeO particles (M) were dispersed in polyvinyl alcohol (PVA) and oriented successfully by applying low external magnetic field. Observed orientation was verified by image analysis using ImageJ software. Crystallinity of the M/PVA samples was examined using DSC, showing a lower crystallinity by addition of particles and higher crystallinity resulting from orientation. Orientation of 0.05 and 0.1 wt% of M particles increased crystallinity of nanocomposites 39 and 57%, respectively. Tensile tests were also measured to examine the mechanical properties of oriented and non-oriented samples. Results show that the mechanical properties of samples including elongation at break and modulus had improved in the direction of oriented particles. Afterward, graphene oxide particles were magnetized [magnetic graphene oxide (MGO)] and dispersed in PVA resulting in improved mechanical properties. PVA/MGO nanocomposites showed better mechanical properties than PVA/M, although no improvement in the crystallinity was observed. [ABSTRACT FROM AUTHOR]

Ensembles of crystals of thin-plate martensite initiated by a strong magnetic field are analyzed within the concepts of the dynamic theory. It is shown that the laws detected agree with a specific dislocation scheme of arrangement of austenite subgrains with orientation {110}. [ABSTRACT FROM AUTHOR]

The magnetic structure of a quasi-one-dimensional frustrated NaCuO magnet single crystal is studied by NMR. The spatial orientation of the planar spin spirals in the copper-oxygen Cu-O chains is determined, and its evolution as a function of the applied magnetic field direction is analyzed. [ABSTRACT FROM AUTHOR]