Nanoparticle alignment using oscillating magnetic fields for scalable nanocomposite manufacturing
Nanoparticle alignment using oscillating magnetic fields for scalable nanocomposite manufacturing
复制标题
使用振荡磁场排列纳米颗粒以实现可扩展的纳米复合材料制造
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
N. Yamamoto
中科院分区：
文献类型：
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作者：
Mychal P. Spencer;N. Yamamoto
磁性组装是一种很有前途的，可扩展的纳米制造方法来组织聚合物纳米复合材料中的纳米填料。纳米复合材料是一种可定制的多功能材料，对于航空航天技术的进步至关重要，因为纳米复合材料可以被潜在地设计成具有重量轻、结构完整性、高的热稳定性和辐射稳定性，甚至具有致动/变形能力的长期操作耐久性。然而，纳米复合材料的应用目前是有限的，由于可扩展性差;批量制造的纳米复合材料与高品质的纳米结构，导致高性能的特点是失踪。在这里，使用振荡磁场的纳米填料的主动组装进行了研究，以评估其组织纳米填料在整个大尺寸的纳米复合材料的有效性。所采取的方法是参数化研究所施加磁场的频率和通量密度如何影响超顺磁性氧化铁颗粒的排列。在该参数研究中，证明了控制颗粒排列几何形状的能力，包括排列线分离;即使在弱场或10-100 G，特别是0.1-5 Hz的小频率下，也证实了振荡磁场对排列颗粒的有效性。当频率从0 Hz（DC）增加到1.0 Hz时，对准线间隔平均增加50%，磁通量密度为50-100 G。对准线的宽度显示在高达0.1 Hz的低频范围内增加约20%，但超过1 Hz时趋于平稳。在50-100 G之间的对准线的长度对于0.1 Hz或以下的低频平均增加60%，但是对于大于0.1 Hz的频率显示出减小的趋势。基于这项研究获得的知识，预计将导致更好地了解纳米粒子的对齐与优惠券大小的纳米复合材料与定制和一致的纳米粒子结构的目标在未来。
Magnetic assembly is a promising, scalable nanomanufacturing method to organize nanofillers within polymer nanocomposites. Nanocomposites, tailorable multifunctional materials, are critical for the advancement of aerospace technologies because nanocomposites can be potentially engineered to function for long operation endurance with light-weight, structural integrity, high thermal and radiation stability, and even with actuation/morphing capabilities. However, nanocomposite application is currently limited due to poor scalability; bulk fabrication of nanocomposites with high-quality nanostructures leading to high performance characteristics is missing. Here an active assembly of nanofillers using oscillating magnetic fields is studied to evaluate its effectiveness of organizing nanofillers throughout large-size nanocomposites. The approach taken is to parametrically study how the frequency and the flux density of the applied magnetic field influence the alignment of superparamagnetic iron oxide particles. In this parametric study, the capability to control particle alignment geometry, including the alignment line separation, is demonstrated; the effectiveness of oscillating magnetic fields to align particles is confirmed even with weak fields or 10-100 G, and particularly with small frequencies of 0.1-5 Hz. The alignment line separation increases by an average 50% when the frequency is increased from 0 Hz (DC) to 1.0 Hz with a magnetic flux density of 50-100 G. The width of the alignment lines shows an ~20% increase with low frequency ranges up to 0.1 Hz, but plateaued beyond 1 Hz. The length of the alignment lines between 50-100 G increases by an average 60% for low frequencies at or below 0.1 Hz, but show a decreasing trend for frequencies greater than 0.1 Hz. Knowledge obtained based on this study is expected to lead to a better understanding of nanoparticle alignment with the goal of coupon-sized nanocomposites with tailored and consistent nanoparticle structures in the future.
DOI：
10.1007/978-1-4939-6840-4_4
发表时间：
2017
期刊：
Methods in molecular biology (Clifton, N.J.)
影响因子：
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作者：
Maldonado-Camargo L;Unni M;Rinaldi C
通讯作者：
Rinaldi C