Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA.
Institute of Special Materials and Technology, Fudan University, Shanghai, 200433, P. R. China.
Small. 2016 May;12(20):2741-9. doi: 10.1002/smll.201503834. Epub 2016 Apr 5.
A proper design of direct liquid phase exfoliation (LPE) for 2D materials as graphene, MoS2 , WS2 , h-BN, Bi2 Se3 , MoSe2 , SnS2 , and TaS2 with common cosolvents is carried out based on considering the polar and dispersive components of surface tensions of various cosolvents and 2D materials. It has been found that the exfoliation efficiency is enhanced by matching the ratio of surface tension components of cosolvents to that of the targeted 2D materials, based on which common cosolvents composed of IPA/water, THF/water, and acetone/water can be designed for sufficient LPE process. In this context, the library of low-toxic and low-cost solvents with low boiling points for LPE is infinitely enlarged when extending to common cosolvents. Polymer-based composites reinforced with a series of different 2D materials are compared with each other. It is demonstrated that the incorporation of cosolvents-exfoliated 2D materials can substantially improve the mechanical and thermal properties of polymer matrices. Typically, with the addition of 0.5 wt% of such 2D material as MoS2 nanosheets, the tensile strength and Young's modulus increased up to 74.85% and 136.97%, respectively. The different enhancement effect of 2D materials is corresponded to the intrinsic properties and LPE capacity of 2D materials.
基于考虑各种共溶剂和二维材料的表面张力的极性和分散分量，对常见共溶剂（如 IPA/水、THF/水和丙酮/水）进行了适当的设计，以增强二维材料（如石墨烯、MoS2、WS2、h-BN、Bi2 Se3、MoSe2、SnS2 和 TaS2）的直接液相剥离（LPE）的设计。在这种情况下，当扩展到常见共溶剂时，用于 LPE 的低毒、低成本、低沸点溶剂库可以无限扩大。对一系列不同二维材料增强的聚合物基复合材料进行了比较。结果表明，共溶剂剥离的二维材料的掺入可以显著提高聚合物基体的力学和热性能。通常，加入 0.5wt%的 MoS2 纳米片等二维材料，拉伸强度和杨氏模量分别提高了 74.85%和 136.97%。二维材料的不同增强效果对应于二维材料的固有特性和 LPE 能力。
