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Efficient Chain Formation of Magnetic Particles in Elastomers with Limited Space

机译：有限空间的弹性体中磁性粒子的高效链形成

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摘要

The magnetic response of the storage modulus for bimodal magnetic elastomers containing magnetic particles with a diameter of 7.0 μm and plastic beads with a diameter of 200 μm were investigated by varying the volume fraction of plastic beads up to 0.60 while keeping the volume fraction of the magnetic particles at 0.10. The storage modulus at 0 mT for monomodal magnetic elastomers was 1.4 × 10 Pa, and it slightly increased with the volume fraction of plastic beads up to 0.6. The storage modulus at 500 mT for bimodal magnetic elastomers at volume fractions below 0.25 was constant, which was equal to that for the monomodal one (=7.9 × 10 Pa). At volume fractions of 0.25–0.40, the storage modulus significantly increased with the volume fraction, showing a percolation behavior. At volume fractions of 0.40-0.60, the storage modulus was constant at 2.0 × 10 Pa, independently of the volume fraction. These results indicate that the enhanced increase in the storage modulus was caused by the chain formation of the magnetic particles in vacancies made of plastic beads.
机译：通过将塑料珠的体积分数更改为最大0.60并保持磁性的体积分数，研究了包含7.0μm直径的磁性颗粒和200μm直径的塑料珠的双峰磁性弹性体的储能模量的磁响应粒子为0.10。单峰磁性弹性体在0 mT下的储能模量为1.4×10 Pa，并且随着塑料珠粒的体积分数达到0.6而略有增加。体积分数低于0.25的双峰磁性弹性体在500 mT时的储能模量恒定，与单峰磁性弹性体的储能模量相同（= 7.9×10 Pa）。当体积分数为0.25-0.40时，储能模量随体积分数显着增加，表现出渗滤行为。在0.40-0.60的体积分数下，储能模量恒定在2.0×10 Pa，与体积分数无关。这些结果表明，储能模量的提高是由在塑料珠制成的空位中磁性颗粒的链形成引起的。

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