A Highly Tunable Silicone-Based Magnetic Elastomer with Nanoscale Homogeneity.
A Highly Tunable Silicone-Based Magnetic Elastomer with Nanoscale Homogeneity.
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DOI：
10.1016/j.jmmm.2011.08.045
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发表时间：
2012-02
影响因子：
2.7
通讯作者：
Superfine R
中科院分区：
文献类型：
--
作者：
Evans BA;Fiser BL;Prins WJ;Rapp DJ;Shields AR;Glass DR;Superfine R
磁性弹性体在传感和驱动方面得到了广泛的应用。与水凝胶等其他材料相比，有机硅基磁性弹性体具有许多优势，但磁性纳米颗粒在有机硅中的聚集很难防止。集结固有地限制了装配式结构的最小尺寸，并导致结构之间的响应不均匀。我们开发了一种新型材料，它是有机硅聚合物(polydimethylsiloxane-co-aminopropylmethylsiloxane)吸附在直径7-10 nm的磁铁矿(γ-Fe203)纳米颗粒表面的络合物。该材料在非常小的长度尺度上是均匀的(<；100 nm)，并且可以被交联以形成灵活的磁性材料，该材料非常适合制造微米到纳米尺度的磁致动器。磁性纳米颗粒在复合材料中的负载率可以在0-50%重量范围内平稳变化，而不会损失均匀性，为调节执行器响应提供了一种简单的机制。我们评估了纳米颗粒负载范围内复合材料的材料性能，并证明了磁场诱导的压缩模数增加了高达300%。此外，我们实现了一种策略来预测磁性驱动应用中的最优纳米颗粒负载，并表明我们的预测与实验结果具有很好的相关性。
Magnetic elastomers have been widely pursued for sensing and actuation applications. Silicone-based magnetic elastomers have a number of advantages over other materials such as hydrogels, but aggregation of magnetic nanoparticles within silicones is difficult to prevent. Aggregation inherently limits the minimum size of fabricated structures and leads to non-uniform response from structure to structure. We have developed a novel material which is a complex of a silicone polymer (polydimethylsiloxane-co-aminopropylmethylsiloxane) adsorbed onto the surface of magnetite (γ-Fe203) nanoparticles 7–10 nm in diameter. The material is homogenous at very small length scales (< 100 nm) and can be crosslinked to form a flexible, magnetic material which is ideally suited for the fabrication of micro- to nanoscale magnetic actuators. The loading fraction of magnetic nanoparticles in the composite can be varied smoothly from 0 – 50% wt. without loss of homogeneity, providing a simple mechanism for tuning actuator response. We evaluate the material properties of the composite across a range of nanoparticle loading, and demonstrate a magnetic-field-induced increase in compressive modulus as high as 300%. Furthermore, we implement a strategy for predicting the optimal nanoparticle loading for magnetic actuation applications, and show that our predictions correlate well with experimental findings.
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影响因子：
2.7
作者：
MASSART, R;DUBOIS, E;HASMONAY, E
通讯作者：
HASMONAY, E
影响因子：
4.6
作者：
Judy, JW;Muller, RS
通讯作者：
Muller, RS
影响因子：
4.6
作者：
Khoo, M;Liu, C
通讯作者：
Liu, C
影响因子：
1
作者：
Abramchuk, S. S.;Grishin, D. A.;Khokhlov, A. R.
通讯作者：
Khokhlov, A. R.
影响因子：
--
作者：
Darling, SB;Bader, SD
通讯作者：
Bader, SD