Zhou Yicong, Xu Lanshu, Liu Minsu, Qi Zheng, Wang Wenbo, Zhu Jiuyi, Chen Shaohua, Yu Kuang, Su Yang, Ding Baofu, Qiu Ling, Cheng Hui-Ming
Shenzhen Geim Graphene Center (SGC), Tsinghua-Berkeley Shenzhen Institute (TBSI), and Tsinghua Shenzhen International Graduate School (TSIGS), Tsinghua University, Shenzhen 51805, China.
Monash Suzhou Research Institute (MSRI), Monash University, Suzhou 215000, China.
ACS Nano. 2022 Jul 26;16(7):10179-10187. doi: 10.1021/acsnano.1c11097. Epub 2022 May 23.
Ball milling is a widely used method to produce graphene and other two-dimensional (2D) materials for both industry and research. Conventional ball milling generates strong impact forces, producing small and thick nanosheets that limit their applications. In this study, a viscous solvent-assisted planetary ball milling method has been developed to produce large thin 2D nanosheets. The viscous solvent simultaneously increases the exfoliation energy () and lowers the impact energy (). Simulations show a giant ratio of η = /, for the viscous solvent, 2 orders of magnitude larger than that of water. The method provides both a high exfoliation yield of 74%, a high aspect ratio of the generated nanosheets of 571, and a high quality for a representative 2D material of boron nitride nanosheets (BNNSs). The large thin BNNSs can be assembled into high-performance functional films, such as separation membranes and thermally conductive flexible films with some performance parameters better than those 2D nanosheets produced by chemical exfoliation methods.
球磨是一种广泛应用于工业和研究领域以生产石墨烯及其他二维（2D）材料的方法。传统球磨会产生强大的冲击力，生成尺寸小且厚度大的纳米片，这限制了它们的应用。在本研究中，已开发出一种粘性溶剂辅助行星球磨法来生产大尺寸的薄二维纳米片。粘性溶剂同时增加了剥离能（）并降低了冲击能（）。模拟显示，对于粘性溶剂，η = / 的比值巨大，比水的该比值大两个数量级。该方法具有74%的高剥离产率、所生成纳米片571的高纵横比以及氮化硼纳米片（BNNSs）这种代表性二维材料的高质量。大尺寸的薄BNNSs可组装成高性能功能薄膜，如分离膜和导热柔性薄膜，其一些性能参数优于通过化学剥离法生产的二维纳米片。
