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MXenes are one of the most promising electrode materials in energy storage devices owing to their unique properties, but the practical applications have been severely plagued by the low accessible electroactive area due to their inevitable restacking during electrode preparation. Recent experimental studies have reported that the additivepolyaniline (PANI) enables us to greatly improve the electrochemical performance of MXene-based electrodes. Herein, we systematically investigate the electronic, electrochemical and mechanical properties of MXene/PANI composites, aiming to acquire a comprehensive insight. The results demonstrate that the insertion of PANI allows effective suppression of the restacking and enhances the electric conductivity and mechanical flexibility. Moreover, the presence of PANI maintains the high Na adsorption strength and fast Na mobility and preserves well the average open circuit voltage features and the maximum Na content of MXenes. These favorable attributes may not only collectively explain the experimentally observed outstanding electrochemical performance, but also render the MXene/PANI composites promising anode candidates in Na-ion batteries.

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The human healthy meniscus fulfills key biomechanical functions in the tibiofemoral (knee) joint. Meniscal injury leads to an increased risk for symptomatic osteoarthritis. In order to prevent osteoarthritis, many researchers have put efforts into developing new-type meniscal substitute materials. In this study, MRI data of the human knee joint is obtained by CT scanning, and a three-dimensional finite element model of the meniscus is established. Compressive forces of 400 N, 600 N, 800 N, and 1000 N are selected to complete the meniscus modeling and finite element simulation analysis of the meniscus by ANSYS; at the same time, the compressive force and compressive displacement of the magnetorheological elastomer are controlled by changing the current size. The results show that the compressive force and compressive displacement of the magnetorheological elastomer can be controlled by an electric current, so as to adapt to the required mechanical properties of the meniscus under external complex loads and provide a theoretical and experimental basis for clinical meniscus replacement.