Magnetic properties of iron-polyethylene nanocomposites prepared by high energy ball milling

Abstract

Metal-polymer nanocomposites in the system iron-polyethylene have been prepared by high energy ball milling. Minimum average grain size obtained is of the order of 9 nm. Enhanced coercivity of 230 Oe at room temperature and 510 Oe at 5 K have been obtained for the sample containing 0.1 volume fraction of iron in polyethylene after milling for 200 h. This high value of the coercivity could be ascribed to the presence of a fraction of single-domain particles in the sample as evidenced from the thermal dependence of the magnetization and ac susceptibility measurements.

Abs/iron nanocomposites prepared by cryomilling

“…2 Our speed rate is much faster; besides, the single composite particle of ABS and Fe is less than 100 nm, and they attain the nanoscale blending, while during comparable time ambimilling could only attain micron scale blending in polymer/metal systems. 3,13 Cryogenic temperature and comilling are considered the main factors contributing to the faster rate of refinement.…”

“…For instance, it owns the light weight and easy processing merits of polymers and peculiar light, electricity, and magnetic performance of nanometer metals; in addition, nanometer iron particles embedded in an insulating matrixlike (ceramic or polymer) exhibit coercivity values orders of magnitude higher than that of bulk iron. 1,2 To Polymer/ metal nanocomposites, the traditional fabrication methods are in situ filling and direct dispersion. These methods rely on processing the materials in melt or in solution.…”

Particle size tuning in silver-polyacrylonitrile nanocomposites

“…Composites made by mechanical mixing of metal nanoparticles and molten polymers generally lead to inhomogeneous particle dispersions. As a consequence, various approaches have been proposed to manufacture metal nanocomposites including ball milling, coevaporation and sputtering of metals and polymers, plasma polymerization, and new synthetic procedures [12][13][14][15]. Among these last approaches, it is important to mention the use of different agents in order to increase nanoparticle stability, the simultaneous photoinduced electron transfer and cationic polymerization, the thermal and UV in situ polymerizations [16][17][18][19][20][21][22].…”

Общность процессов спонтанного и вынужденного перемагничивания кластеров MnSb, внедренных в тонкие пленки GaMnSb

“…Однако выражение (3), в отличие от формулы Кнеллера, учи-тывает распределение наночастиц по размерам. Ранее было установлено, что закон Кнеллера применим к самым различным наночастицам: Fe [7], Cu [15] и др. При этом в работах [9,12,14] были обнаружены расхождения между экспериментальными зависимостя-ми H C (T ) и формулой Кнеллера, которые объясня-ются несколькими факторами: в первую очередь -распределением наночастиц по размерам.…”