The self-assembly of two-dimensional MXene films is used in various fields to construct multi-scale structures due to its electrical, mechanical and chemical properties. In principle, MXene nanosheets are assembled by intermolecular interactions, including hydrogen bonds, electrostatic interactions and van der Waals forces.



Recently, Tae Hee Han of Hanyang University in South Korea reported a strategy to strengthen the MXene gel network to obtain sufficient stability to resist mechanical disturbances. By controlling the pH value, the electrostatic interaction between the MXene sheets is enhanced.

Article points

1) This MXene gel can deform stably in the direction of external shear stress, so the gel has sufficient mechanical strength to withstand the deformation.



2) Studies have found that the enhanced gel network can be used to prepare fully oriented fibers. When MXene solution is wet-spinned in a coagulation bath, Mxene sheets are assembled into gel fibers, and the gel fibers spontaneously transform into highly oriented fibers under the action of mechanical tensile force.





3) Compared with other fibers, oriented MXene fiber has higher conductivity (12504 S cm−1) and higher Youngs modulus (122 Gpa).



This structural design method provides a general strategy to prepare high-performance fibers, manipulates the molecular interaction between colloidal particles to induce a strong and deformable gel network, and allows 2D colloidal particles to be arranged along the fluid gradient to form the desired Structure.





references

Hwansoo Shin, et al, Highly Electroconductive and Mechanically Strong Ti3C2Tx MXene Fibers Using a Deformable MXene Gel, ACS Nano, 2021

DOI: 10.1021/acsnano.0c10255

https://dx.doi.org/10.1021/acsnano.0c10255


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