Abstract Due to their extraordinary properties, two-dimensional boron nitride nanosheets (BNNSs) have great promise for a wide range of applications. To progress from the laboratory to commercial applications, the key is to develop a simple process to massively produce BNNSs as well as their macroscopic materials. Herein, an extremely simple, straightforward paste-based sand-milling exfoliation strategy is developed to produce BNNSs paste on a kilogram scale from bulk hexagonal boron nitride. A total-conversion exfoliation with ultrahigh concentration (22 wt%) and production rate (1.833 g h−1), one to four orders of magnitude higher than those in previous reports, is achieved. The exfoliation does not require any assisted chemicals (strong oxidizing acids, strong alkalis, intercalants or surfactants), and thus avoids subsequent purification treatments. Further, convenient and fast paste-based processing methods including sol-gel-film transformation, doctor blading, and foam infiltration are developed to massively produce BNNSs composite materials which present outstanding mechanical, thermoconductive and flame-retardant properties. The present paste-based strategy to produce BNNSs and their composite materials has prominent advantages over conventional solution-based strategy in simplicity, yield, concentration, throughput, production rate and solvent consumption, and thus paves the way for the commercial application of BNNSs.

中文翻译：

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基于糊状砂磨策略的二维氮化硼全转化、高浓度剥离，用于大规模生产高性能纳米复合材料

摘要 由于其非凡的性能，二维氮化硼纳米片 (BNNSs) 具有广泛的应用前景。要从实验室发展到商业应用，关键是开发一种简单的工艺来大规模生产 BNNS 及其宏观材料。在此，开发了一种极其简单、直接的基于糊状物的砂磨剥离策略，以从块状六方氮化硼生产千克级的 BNNSs 糊状物。实现了超高浓度 (22 wt%) 和生产率 (1.833 g h-1) 的总转化剥离，比之前的报告高出一到四个数量级。去角质不需要任何辅助化学品（强氧化酸、强碱、嵌入剂或表面活性剂），从而避免了后续的纯化处理。此外，还开发了包括溶胶-凝胶-膜转化、刮刀和泡沫渗透在内的方便快捷的糊状加工方法，以大规模生产具有优异机械、导热和阻燃性能的 BNNSs 复合材料。目前的糊状制备 BNNSs 及其复合材料的策略在简单性、产量、浓度、吞吐量、生产率和溶剂消耗方面比传统的基于溶液的策略具有显着优势，从而为 BNNSs 的商业应用铺平了道路。和泡沫渗透被开发用于大规模生产具有优异机械、导热和阻燃性能的 BNNSs 复合材料。目前的糊状制备 BNNSs 及其复合材料的策略在简单性、产量、浓度、吞吐量、生产率和溶剂消耗方面比传统的基于溶液的策略具有显着优势，从而为 BNNSs 的商业应用铺平了道路。和泡沫渗透被开发用于大规模生产具有优异机械、导热和阻燃性能的 BNNSs 复合材料。目前的糊状制备 BNNSs 及其复合材料的策略在简单性、产量、浓度、吞吐量、生产率和溶剂消耗方面比传统的基于溶液的策略具有显着优势，从而为 BNNSs 的商业应用铺平了道路。