Chen Tianxing, Yuan Yuan, Zhao Yunliang, Rao Feng, Song Shaoxian
Instituto de Investigacion en Metalurgia y Materiales , Universidad Michoacana de San Nicolas de Hidalgo , Ciudad Universitaria, Morelia , Michoacan 58030 , Mexico.
Langmuir. 2019 Feb 12;35(6):2368-2374. doi: 10.1021/acs.langmuir.8b04171. Epub 2019 Feb 4.
The exfoliation of layered montmorillonite (MMT) into mono- or few-layer sheets is of significance for both fundamental studies and potential applications. In this report, exfoliated MMT nanosheets with different aspect ratios have been prepared via a new freezing/thawing-ultrasonic exfoliation method. Freezing/thawing processing can exfoliate MMT tactoids with low efficiency while virtually retaining the original lateral size. The ultrasonic method has better exfoliation efficiency but tends to damage the nanosheets. By combining them and reasonably controlling the cycle index of freezing/thawing and ultrasonic power, the MMT nanosheets with different aspect ratios have been prepared efficiently. Such a unique exfoliation method has broad applicability for layered materials to produce monolayer nanosheets on a large scale.
层状蒙脱石（MMT）剥离成单层或少数层薄片对于基础研究和潜在应用都具有重要意义。在本报告中，通过一种新的冷冻/解冻-超声剥离方法制备了具有不同纵横比的剥离型MMT纳米片。冷冻/解冻处理可以低效地剥离MMT准晶体，同时几乎保留原始的横向尺寸。超声方法具有更好的剥离效率，但容易损坏纳米片。通过将它们结合并合理控制冷冻/解冻的循环指数和超声功率，高效地制备了具有不同纵横比的MMT纳米片。这种独特的剥离方法对于层状材料大规模制备单层纳米片具有广泛的适用性。
