六方氮化硼
材料科学
制作
平面的
环氧树脂
复合材料
热导率
剪切力
剪切(地质)
挤压
氮化硼
纳米技术
石墨烯
计算机科学
替代医学
计算机图形学(图像)
医学
病理
作者
Yunxia Chen,Zhiming Gao,Simon A. Hoo,Varun Tipnis,Renjing Wang,Ivan Mitevski,Dale Hitchcock,Kevin L. Simmons,Ya‐Ping Sun,Malisa Sarntinoranont,Yong Huang
标识
DOI:10.1002/adma.202314097
摘要
Abstract Planarly aligning 2D platelets is challenging due to their additional orientational freedom compared to 1D materials. This study reports a sequential dual‐alignment approach, employing an extrusion‐printing‐induced shear force and rotating‐magnetic‐field‐induced force couple for platelet planarly alignment in a yield‐stress support bath. It is hypothesized that the partial alignment induced by a directional shear force facilitates subsequent axial rotation of the platelets for planar alignment under an external force couple, resulting in a synergistic alignment effect. This sequential dual‐alignment approach achieves better planar alignment of 2D modified hexagonal boron nitride (mhBN). Specifically, the thermal conductivity of the 40 wt% mhBN/epoxy composite is significantly higher (692%) than that of unaligned composites, surpassing the cumulative effect of individual methods (only 133%) with a 5 times more synergistic effect. For 30, 40, and 50 wt% mhBN composites, the thermal conductivity values (5.9, 9.5, and 13.8 W m −1 K −1 ) show considerable improvement compared to the previously reported highest values (5.3, 6.6, and 8.6 W m −1 K −1 ). Additionally, a 3D mhBN/epoxy heat sink is printed and evaluated to demonstrate the feasibility of device fabrication. The approach enables the planar alignment of electrically or thermally conducting 2D fillers during 3D fabrication.
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