Friction
·
2024
·Vol. 12
·期 8
·1728-1740
·
IF 6.3
Cui Yuhong,Xue Shenghua,Wang Tiantian,Liu Shujuan,Ye Qian,Zhou Feng,Liu Weimin
Herein, we have prepared SiO 2 particles uploaded MXene nanosheets via in-situ hydrolysis of tetraetholothosilicate. Due to the large number of groups at the edges of MXene, SiO 2 grows at the edges first, forming MXene@SiO 2 composites with a unique core-rim structure. The tribological properties of MXene@SiO 2 as lubricating additive in 500 SN are evaluated by SRV-5. The results show that MXene@SiO 2 can reduce the friction coefficient of 500 SN from 0.572 to 0.108, the wear volume is reduced by 73.7%, and the load capacity is increased to 800 N. The superior lubricity of MXene@SiO 2 is attributed to the synergistic effect of MXene and SiO 2 . The rolling friction caused by SiO 2 not only improves the bearing capacity but also increases the interlayer distance of MXene, avoiding accumulation and making it more prone to interlayer slip. MXene@SiO 2 is adsorbed on the friction interface to form a physical adsorption film and isolate the friction pair. In addition, the high temperature and high load induce the tribochemical reaction and form a chemical protection film during in the friction process. Ultimately, the presence of these protective films results in MXene@SiO 2 having good lubricating properties.
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高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Hua Tian,Zhiwei Guo,Wenjun Zhao,Lin Wang,Deqi Kong,Yanyan Wang,Lixin Zhang,Lingyu Li,Ran Sun,Ruohan Li,Jian Song
Hybrid layers composed of polyacrylic acid and Ti 3 C 2 T x MXene are coated on the surface of Zn foils via electrophoresis deposition processes , realizing the construction of an artificial protective coating with the pre-introduction of excess Zn 2+ towards suppressing Zn 2+ 2D diffusion of Zn deposition behavior . In this case, the abundant carboxyl groups of polyacrylic acid benefit to the fast transport of Zn 2+ in addition to the shield of anions and oxidants, restraining the corrosion and passivation of Zn metal anodes. Moreover, the appearance of Ti 3 C 2 T x MXene with two-dimensional arrangements strengthens the structure stability and improves the hydrophilicity of hybrid layers so as to restrict the dendrite growth of Zn metal anodes. Accordingly, polyacrylic acid/Ti 3 C 2 T x MXene hybrid layer coated Zn electrodes in symmetric cells achieve a lifespan of over 1000 h at a current density of 3 mA cm −2 and an areal capacity of 3 mAh cm −2 , superior to pristine Zn electrodes (107 h) and polyacrylic acid layer coated Zn electrodes (401 h). The full cell based on polyacrylic acid/Ti 3 C 2 T x MXene hybrid layer coated Zn anodes and Na 0.33 V 2 O 5 cathodes also exhibits a high capacity retention of 98.6 % after 1000 cycles at a current density of 5 A g −1 .
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Hang Jia,Cheng Liu,Yu Zhang,Yue Qiao,Wenqi Zhao,Xi Chen,Xigao Jian
Electrophoretic deposition (EDP) is a novel and promising technique for surface modification, however, the adsorption of Ti 3 C 2 T x MXene or graphene oxide (GO) onto the basalt fiber (BF) surface by EPD and its effects on the mechanical performance of basalt fiber reinforced high-performance thermoplastic (BFRHPTP) composite have yet to be investigated. Here, the mechanical and interfacial properties of the modified BF/PPENK were explored. The influence of the brittle/tough nanostructures in interphase on the mechanical performance of BF reinforced poly(phthalazinone ether nitrile ketone) (BF/PPENK) was elucidated. The results indicated that the thermal reduction of GO contributed even more to enhancing the tensile, flexural, interlaminar shear, and interfacial shear strength of BF/PPENK compared to the heat oxidation of MXene. Particularly, these properties of BF-NH 2 @GO3/PPENK were improved by approximately 84%, 43%, 60%, and 118% in comparison to BF-Desized/PPENK. This work may provide some guidance on the interfacial modification of the BFRHPTP composites.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhongbao Ma,Peilin Liu,Wenfeng Chen,Chengyi Wang,Yangbo Qiu,Long-Fei Ren,Jiahui Shao
Electroconductive membranes are of interest because their selectivity-permeability and fouling resistance are improved with electrical assistance. MXene lamellar membranes are competitive candidates. However, the swelling problem of MXene membranes has not been adequately addressed, especially at dynamic voltages, resulting in weakened separation performance. In this study, carboxylated cellulose nanofibers intercalated MXene membranes with stable interlayer spacing were developed by constructing column-to-beam structure and mortise-tenon connection. The results showed that the interlayer spacing and membrane pore size of the MX/CN composite membrane were almost invariable before and after electro-assisted filtration. Benefiting from the anti-swelling properties and good electrical conductivity, the MXene composite membranes showed a significant increase in the retention of typical monovalent and divalent inorganic salts at external voltages (from 46.2 % and 80.4 % at 0 V to 60.6 % and 88.7 % at 2.0 V for NaCl and Na 2 SO 4 , respectively), as well as a slight increase in the flux. This enhancement mechanism was attributed to the increase of the Stern layer in the adjacent nanosheets of lamellar membranes under electrical assistance. In addition, external voltage was also effective in improving the fouling resistance and enrichment performance of MXene composite membranes for actual textile wastewater, which might be due to the enhanced electrostatic repulsion and electrokinetic behavior under electrical assistance. This work aims to offer new insights into the advancement of electroconductive membranes with a stable structure for desalination and wastewater treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiaofeng Fang,Mengchen Shi,Ziyi Zhang,Xingran Zhang,Xuzhao Yan,Fang Li,Shengtao Jiang,Yanbiao Liu
Two-dimensional MXene membranes have garnered significant attention in the field of water treatment. Nevertheless, achieving a balance between permeability and selectivity remains a fundamental challenge in MXene membrane separation. Herein, a novel electrically active nanofiltration (NF) membrane (CNT/MXene-PEI) with an ultra-thin separation layer was prepared through vacuum filtration of MXene and cross-linking of polyethyleneimine (PEI) on the CNT substrate. By controlling the thickness of the MXene separation layer to reduce mass transfer resistance and applying a negative voltage to enhance the electrostatic effect between the conductive membrane and charged pollutants, the dye rejection rate and anti-pollution performance were improved. At an optimal MXene loading of 15.625 mg/m 2 , the thickness of the separation layer was about ∼47 nm. Under these conditions, the pure water flux achieved was 156.11 LMH/bar. The rejection rate of methylene blue (MLB) increased from 26.2 % to 97.9 % under an applied voltage of −2 V, while the rejection rate for inorganic salts was 9 %. The dye/salt separation factor was approximately 11. Furthermore, the flux recovery rate of the CNT/MXene-PEI membrane was at 90 % after 12 h of operation with applied voltage of −2 V, indicating excellent anti-pollution performance and long-term operational stability. These results demonstrate the combined effect of structural regulation and electric field enhancement in the membrane's filtration performance. This study offers a new approach for overcoming the trade-off effect between permeability and selectivity in dye/salt separation processes.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Tiantian Dai,Yanting Liu,Dandan Rong,Meng Wang,Zhenkun Qi,Yinling Zhao,Xiandi Wang,Qing Yang,Lei Wei,Mengxiao Chen
Inspired by natural organisms, soft actuators can convert environmental stimuli into mechanical deformation, making them indispensable for applications in a variety of fields such as soft robotics. MXene, displaying exceptional attributes in conductivity, thermal efficiency, good dispersibility etc., has emerged as a preferred material for high-performance thermal actuators. However, single actuators struggle to achieve complex tasks realized by intelligent robotic systems. Herein, a bioinspired dynamic matrix is presented utilizing the developable structure of MXene-cellulose nanofibers (CNF) soft actuators. The inclusion of CNF considerably bolsters the mechanical properties of MXene. The MXene-CNF film possessed a higher working strain range (≈14%) than pure MXene film (≈2%). The designed developable structures complete the actuating movements. The sensing layer integration with the actuating layer led to an extremely low touch detection limit (0.3 kPa) and expedited actuating-feedback due to the interaction between contact charging and electrostatic induction. A responsive dynamic matrix containing 3 × 3 soft actuators, completed with a close-looped sensing-feedback function, is developed similar to the behavior of the mimosa plant. This mimosa-inspired dynamic matrix is capable of identifying the source of touch stimuli and providing immediate feedback. This research broadens the potential for enhancing adaptability and intelligence of soft robotic system.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yuanhong Zhou,Ziyuan Zong,Mohamed S. Selim,Xiang Chen,Zhifeng Hao
The problem of antibiotic misuse leading to bacterial resistance is a significant challenge currently faced. The rapid adaptability and evolutionary capabilities of microorganisms have caused strains that were initially sensitive to antibiotics to gradually become resistant, posing a threat to traditional antibacterial treatments. Therefore, the search for antibacterial treatment methods, especially those less likely to induce resistance, has become crucial. Photodynamic antibacterial therapy is an emerging method with efficient antibacterial and selective effects, reducing the risk of resistance. A two-dimensional nanocomposite material, modified with quaternized ruthenium complexes on MXene, has been developed. The minimum inhibitory concentrations against Escherichia coli and Staphylococcus aureus were found to be 23.4 and 29.0 μg/mL, respectively, under xenon lamp irradiation with a light power intensity of 100 mW/cm2 for 20 min. The bactericidal effects of the Q/Ru-MXene composite system were quantitatively and qualitatively confirmed through plate counting and live/dead staining. This system integrates the chemical antibacterial properties of quaternary ammonium salts, the photodynamic antibacterial effects of ruthenium complexes, and the photothermal antibacterial properties of MXene. The simultaneous application of these three therapeutic approaches allows for the development of a chemical/photodynamic/photothermal antibacterial strategy that can attack bacteria on multiple levels, enhancing treatment efficacy, slowing down the development of bacterial resistance, and adapting better to different types of infections. Research and the application of this comprehensive strategy have the potential to bring breakthroughs and innovations to the field of antibacterial treatment.
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International Journal of Electrochemical Science
·
2024
·
IF 1.3
Haifan Chen,Gongwei Xia,Jianfang Chen,Hao Zheng
Phenolic compounds are considered to be major environmental pollutants because of their toxicity and hazard on the marine ecosystem and human health even at low concentrations. An ultrasensitive biosensor was fabricated by immobilizing polyphenol oxidase into a composite of transition metal carbides (MXene)-yttrium oxide (Y 2 O 3 ) for the detection of catechol in environmental water bodies. The morphology and electrochemical performance of the as-prepared biosensors were investigated using scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV), respectively. Under the optimal pH value and applied potential, the biosensor exhibited a linear response range from 0.04 to 3.2 µM (R 2 = 0.9974) with an excellent sensitivity of 2294.8 mA·M −1 . The limit of detection (LOD) was found to be 7 nM (S/N = 3) with acceptable repeatability and reproducibility. The interference from ascorbic acid, uric acid, CuSO 4 , MgSO 4 , FeCl 3 , CaCl 2 , and ZnSO 4 was also investigated. The proposed biosensor was used for the determination of trace catechol in real water samples with satisfactory results compared with that of HPLC. The construction of MXene-Y 2 O 3 composite is expected to be a platform for immobilizing enzymes to prepare versatile electrochemical biosensors.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jianbo Xiong,Qing Li,Kaihui Li,Xue Guo,Ming Zhong,Ruoyu Wang,Yao Chen,Xiaojuan Tan,Bing Na,Xiaolan Tong
Two-dimensional metal–organic frameworks (2D MOFs) have been considered to be one type of potential cathodes for lithium storage due to their regular channels and devisable redox-active sites. However, the relatively low electrical conductivity and weak long-term cyclability hindered their development. Herein, we report an optimized bimetallic conductive 2D MOF (Co 1.5 Ni 1.5 (HHTP) 2 ) for enhanced lithium-ion storage. Specifically, the optimal 2D MOF electrode demonstrates a reversible capacity of 615.2 mAh/g at 0.2 A/g and the specific energy density up to 826 Wh Kg −1 after 100 cycles. Moreover, a heterostructure (Co 1.5 Ni 1.5 (HHTP) 2 @MXene) was constructed by stacking Co 1.5 Ni 1.5 (HHTP) 2 MOF on the 2D Ti 3 C 2 MXene nanosheets to improve the rate performance and cycling stability. The heterostructure electrode kept 74.1 % of the initial capacity with nearly 100 % coulombic efficiency even at 2000 cycles. Ex situ characterizations and density functional theory calculations were carried out to reveal the redox mechanism of the 2D conductive MOF. Electronic states study unveils that the quinoid oxygens and the metal centers are responsible for the redox reaction during lithiation/delithiation process, the composited 2D MXene can promote the electron transfer. The development of bimetallic mixed conductive 2D MOF @ 2D MXene heterogeneity offers valuable insights into the design of electrode materials for lithium storage.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Meng Xu,Zhiyou Tan,Yilong Tian,Feng Gong,Kebing Yi,Zhike He,Xinghu Ji
Developing anode materials significantly enhances the desalination performance of hybrid capacitive deionization (HCDI). Bismuth exhibits high selectivity for chloride ion removal. However, the sluggish kinetics and poor cycling stability of bismuth present considerable challenges for its application in high-capacitance deionization. In this study, we successfully prepared a binder-free Bi@MXene film electrode for chloride storage by employing an electrostatic self-assembly strategy to anchor Bi nanospheres into MXene layers. The bismuth nanospheres, as the pillars of MXene network, improve the self-stacking problem of Ti 3 C 2 T X layers. And MXene layers effectively mitigate the volume expansion of bismuth nanospheres through the spatial confinement effect. Benefiting from three-dimentional sandwich structure of Bi@MXene film, the HCDI system exhibits outstanding salt adsorption capacity (113.4 mg·g −1 ), excellent adsorption rate (4.2 mg·g −1 ·min −1 ) and a good desalination capacity retention of 84.6 % following 50 cycles at 100 mA·g −1 . The development of this composite material provides insights for the design of efficient and stable chloride storage electrodes.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Jianxiang Xiong,Yiming Liao,Xuejun Lai,Hongqiang Li,Xingrong Zeng
The preparation of silicone rubber with excellent tracking resistance and flame retardancy is of great significance for application in high-voltage electrical insulation. Unfortunately, to date there lacks an effective strategy to simultaneously endow silicone rubber with satisfied tracking resistance and flame retardancy. In this work, aminopropyltriethoxysilane-modified MXene (APTES-MXene) was prepared by dehydrative condensation between the Si-OH in the hydrolyzed aminopropyltriethoxysilane (APTES) and the hydroxyl groups in MXene. The APTES-MXene was homogeneously dispersed in addition-cure liquid silicone rubber (ALSR). The effects of APTES-MXene on the tracking resistance and flame retardancy of ALSR were investigated. Incorporating 0.175 phr APTES-MXene and 15 ppm Pt catalyst enabled ALSR to pass 1A4.5 level, with a low erosion rate of only 0.29 %, indicating a significantly improved tracking resistance. Meanwhile, the 0.175 phr APTES-MXene also endowed ALSR a UL-94 V-0 rating and the limiting oxygen index (LOI) value reached 32.8 %. It was found that APTES-MXene and Pt catalyst synergistically promoted ALSR forming ceramic layer at elevated temperature. The mechanism for APTES-MXene improving the tracking resistance of ALSR was also proposed. This work provided new insights for high performance high-voltage insulation silicone rubber.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 10
·4570-4579
·
IF 2.7
Nana Li,Yuncong Yang,Balaji Murugesan,Yong Zhang,Zhuo Chen,Xiaogang Yang,Yurong Cai
To achieve a conductive hydrogel with favourable mechanical and electrical properties, an oriented Mxene-SNF (MSNF) conductive hydrogel was developed using the directional freezing technique. This process involved combining silk fibroin nanofibers (SNF) rich in β-sheet structures with MXene nanosheets to establish an oriented internal cross-linked network. The study investigated the influence of various factors on the hydrogel's mechanical and electrical properties. Results demonstrated that the hydrogel's mechanical properties were influenced by SNF content, MXene content and internal structure. Optimal mechanical properties and favourable electrical conductivity were achieved when the SNF mass fraction was 10%, the MXene mass fraction was 10%, and the internal structure was oriented. The obtained oriented MSNF hydrogel displayed a tensile strain of 80% ± 3%, a tensile stress of 0.89 ± 0.03 MPa, and an elastic modulus of 3.41 ± 0.05 MPa, roughly twice that of the human forearm skin. It maintained a stable resistance response at 0–70% tensile strain. To demonstrate its stability and durability, the hydrogel underwent 500 cycles within the 30–50% tensile strain interval. Therefore, the conductive hydrogel exhibits the potential to be attached to different parts of the human body for real-time monitoring of human movement. Its strain-sensing potential holds value in the field of flexible wearable sensors.
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