High-Throughput Continuous Production of Shear-Exfoliated 2D Layered Materials using Compressible Flows
High-Throughput Continuous Production of Shear-Exfoliated 2D Layered Materials using Compressible Flows
复制标题
使用可压缩流的剪切剥离二维层状材料的高产能连续生产
DOI：
10.1002/adma.201800200
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发表时间：
2018-07-26
影响因子：
29.4
通讯作者：
Kaner, Richard B.
中科院分区：
文献类型：
--
作者：
Rizvi, Reza;Nguyen, Emily P.;Kaner, Richard B.
2D纳米材料在下一代电子产品、消费品、能源生产和储存以及医疗保健中得到了广泛的应用。二维纳米材料的实用和应用的快速增长需要为其大规模生产开发手段。这项研究详细介绍了一种新的可压缩流剥离方法，该方法利用悬浮在高压气体中的2D层状材料的多相流进行膨胀。将膨胀的气固混合物喷洒在合适的溶剂中，发现初始六方氮化硼材料的很大一部分(高达10%的产率)被剥离，平均厚度为4.2 nm。这种剥落归因于可压缩气体在狭窄孔口和收敛-扩张通道内的超音速流动所产生的高剪切速率(>；10(5)S(-1))。这种方法与目前的2D材料剥离方法(如化学插层剥离和液相剪切剥离)相比具有显著的优势，最明显的好处是该过程快速、连续。其他优点包括对环境友好的处理、减少缺陷的发生，以及适用于使用任何气体介质的任何2D层状材料的多功能性。将这一过程扩展到工业生产中，很有可能降低制造2D纳米材料的成本。
2D nanomaterials are finding numerous applications in next-generation electronics, consumer goods, energy generation and storage, and healthcare. The rapid rise of utility and applications for 2D nanomaterials necessitates developing means for their mass production. This study details a new compressible flow exfoliation method for producing 2D nanomaterials using a multiphase flow of 2D layered materials suspended in a high-pressure gas undergoing expansion. The expanded gas-solid mixture is sprayed in a suitable solvent, where a significant portion (up to 10% yield) of the initial hexagonal boron nitride material is found to be exfoliated with a mean thickness of 4.2 nm. The exfoliation is attributed to the high shear rates ( > 10(5) s(-1)) generated by supersonic flow of compressible gases inside narrow orifices and converging-diverging channels. This method has significant advantages over current 2D material exfoliation methods, such as chemical intercalation and exfoliation, as well as liquid phase shear exfoliation, with the most obvious benefit being the fast, continuous nature of the process. Other advantages include environmentally friendly processing, reduced occurrence of defects, and the versatility to be applied to any 2D layered material using any gaseous medium. Scaling this process to industrial production has a strong possibility of reducing the cost of creating 2D nanomaterials.