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Simultaneous Production and Functionalization of Boron Nitride Nanosheets by Sugar‐Assisted Mechanochemical Exfoliation
Advanced Materials ( IF 27.4 ) Pub Date : 2019-01-11 , DOI: 10.1002/adma.201804810 Shaohua Chen 1 , Runzhang Xu 1 , Jiaman Liu 1 , Xiaolong Zou 1 , Ling Qiu 1 , Feiyu Kang 1 , Bilu Liu 1 , Hui-Ming Cheng 1, 2
Advanced Materials ( IF 27.4 ) Pub Date : 2019-01-11 , DOI: 10.1002/adma.201804810 Shaohua Chen 1 , Runzhang Xu 1 , Jiaman Liu 1 , Xiaolong Zou 1 , Ling Qiu 1 , Feiyu Kang 1 , Bilu Liu 1 , Hui-Ming Cheng 1, 2
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Due to their extraordinary properties, boron nitride nanosheets (BNNSs) have great promise for many applications. However, the difficulty of their efficient preparation and their poor dispersibility in liquids are the current factors that limit this. A simple yet efficient sugar‐assisted mechanochemical exfoliation (SAMCE) method is developed here to simultaneously achieve their exfoliation and functionalization. This method has a high actual exfoliation yield of 87.3%, and the resultant BNNSs are covalently grafted with sugar (sucrose) molecules, and are well dispersed in both water and organic liquids. A new mechanical force–induced exfoliation and chemical grafting mechanism is proposed based on experimental and density functional theory investigations. Thanks to the good dispersibility of the nanosheets, flexible and transparent BNNS/poly(vinyl alcohol) (PVA) composite films with multifunctionality is fabricated. Compared to pure PVA films, the composite films have a remarkably improved tensile strength and thermal dissipation capability. Noteworthy, they are flame retardant and can effectively block light from the deep blue to the UV region. This SAMCE production method has proven to be highly efficient, green, low cost, and scalable, and is extended to the exfoliation and functionalization of other two‐dimensional (2D) materials including MoS2, WS2, and graphite.
中文翻译：
糖辅助机械化学剥离法同时生产和氮化硼纳米片
由于其非凡的性能，氮化硼纳米片（BNNS）在许多应用中都具有广阔的前景。然而，其有效制备的困难以及它们在液体中的分散性差是限制其的当前因素。本文开发了一种简单而有效的糖辅助机械化学剥离（SAMCE）方法，以同时实现其剥离和功能化。该方法的实际剥落率很高，为87.3％，并且所得的BNNS与糖（蔗糖）分子共价接枝，并且可以很好地分散在水和有机液体中。在实验和密度泛函理论研究的基础上，提出了一种新的机械力诱导的剥落和化学接枝机理。由于纳米片具有良好的分散性，制备了具有多功能性的柔性透明BNNS /聚乙烯醇（PVA）复合膜。与纯PVA薄膜相比，复合薄膜具有显着提高的拉伸强度和散热能力。值得注意的是，它们具有阻燃性，可以有效地阻挡从深蓝色到UV区域的光线。这种SAMCE生产方法已被证明是高效，绿色，低成本和可扩展的，并且已扩展到包括MoS在内的其他二维（2D）材料的剥离和功能化2，WS 2和石墨。
更新日期：2019-01-11
中文翻译：
糖辅助机械化学剥离法同时生产和氮化硼纳米片
由于其非凡的性能，氮化硼纳米片（BNNS）在许多应用中都具有广阔的前景。然而，其有效制备的困难以及它们在液体中的分散性差是限制其的当前因素。本文开发了一种简单而有效的糖辅助机械化学剥离（SAMCE）方法，以同时实现其剥离和功能化。该方法的实际剥落率很高，为87.3％，并且所得的BNNS与糖（蔗糖）分子共价接枝，并且可以很好地分散在水和有机液体中。在实验和密度泛函理论研究的基础上，提出了一种新的机械力诱导的剥落和化学接枝机理。由于纳米片具有良好的分散性，制备了具有多功能性的柔性透明BNNS /聚乙烯醇（PVA）复合膜。与纯PVA薄膜相比，复合薄膜具有显着提高的拉伸强度和散热能力。值得注意的是，它们具有阻燃性，可以有效地阻挡从深蓝色到UV区域的光线。这种SAMCE生产方法已被证明是高效，绿色，低成本和可扩展的，并且已扩展到包括MoS在内的其他二维（2D）材料的剥离和功能化2，WS 2和石墨。
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