The effect of polymer stiffness on magnetization reversal of magnetorheological elastomers
The effect of polymer stiffness on magnetization reversal of magnetorheological elastomers
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DOI：
10.1063/5.0086761
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发表时间：
2022-04-01
期刊：
影响因子：
6.1
通讯作者：
Cheng, Xuemei M.
中科院分区：
文献类型：
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作者：
Clark, Andy T.;Marchfield, David;Cheng, Xuemei M.
超软磁流变弹性体（MRE）提供了方便的实时磁场控制的机械性能，提供了一种手段，模仿机械线索和调节细胞在体外。在这里，我们系统地研究了聚合物刚度的磁化反转的MRE使用相结合的磁力测量和计算建模的效果。使用商业聚合物Sylgard（TM）527、Sylgard 184和羰基铁粉合成杨氏模量范围超过两个数量级的基于聚二甲基硅氧烷的MRE。较软的MRE的磁滞回线表现出一个特征捏环形状，几乎为零的剩磁和回路加宽，在中间领域，单调降低，随着聚合物刚度。一个简单的双偶极子模型，采用磁-机械耦合不仅证实了微米级粒子运动沿着施加的磁场方向发挥了决定性的作用，在超软磁流变液的磁滞，但也再现了所观察到的环路形状和扩大趋势的磁流变液与不同的聚合物刚度。(C)2022年作者。
Ultrasoft magnetorheological elastomers (MREs) offer convenient real-time magnetic field control of mechanical properties that provides a means to mimic mechanical cues and regulators of cells in vitro. Here, we systematically investigate the effect of polymer stiffness on magnetization reversal of MREs using a combination of magnetometry measurements and computational modeling. Poly-dimethylsioxane-based MREs with Young's moduli that range over two orders of magnitude were synthesized using commercial polymers Sylgard (TM) 527, Sylgard 184, and carbonyl iron powder. The magnetic hysteresis loops of the softer MREs exhibit a characteristic pinched loop shape with almost zero remanence and loop widening at intermediate fields that monotonically decreases with increasing polymer stiffness. A simple two-dipole model that incorporates magneto-mechanical coupling not only confirms that micrometer-scale particle motion along the applied magnetic field direction plays a defining role in the magnetic hysteresis of ultrasoft MREs but also reproduces the observed loop shapes and widening trends for MREs with varying polymer stiffnesses. (C) 2022 Author(s).