TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Qian Ye,Xin Chen,Xiaozhi Zhang,Xinnan Wang,Yuhong Cui,Shujuan Liu,Feng Zhou
Herein, the anti-corrosive polymer brush functionalized MXene (P-MBTS 2 MA@MXene) was successfully prepared via surface-initiated polymerization. First, the dopamine initiator (DA-Br) can self-assemble onto MXene nanosheets formation of initiator modified MXene (PDA-Br@MXene) via spontaneous oxidative polymerization, then the corrosion inhibitor MBT derivative MBTS 2 MA monomer was grafted onto MXene nanosheets through surface-initiated atom transfer radical polymerization (SI-ATRP) to obtain polymer brush P-MBTS 2 MA functionalized MXene (P-MBTS 2 MA@MXene). The prepared P-MBTS 2 MA@MXene served as lubricant additive, manifesting good tribological properties with a low COF of 0.098 % and 94.8 % wear-reduction, which is attributed to the shielding effect and protective film formed by P-MBTS 2 MA@MXene. Additionally, the grafting P-MBTS 2 MA endows MXene nanosheets with improved anti-corrosion property, which prevents further corrosion of the metal surface via releasing corrosion resistance molecule MBT.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jingxuan Cui,Jiao Wu,Aihu Feng,Yang Yu,Le Mi,Yun Yu
As a novel material with low infrared emissivity, Ti 3 C 2 T x MXene is promising in infrared stealth. However, the problem that MXene is easily oxidized poses a great challenge to its practical applications. In this paper, a tannic acid (TA) enhanced MXene oxidation stability composite film with low infrared emissivity is reported. TA effectively diminishes the pore size within the MXene film and leads to a tight and orderly arrangement of nanosheets, maintaining the low emissivity properties of Ti 3 C 2 T x MXene itself. In addition, TA reacts preferentially with H 2 O/O 2 entering the film to consume the oxidizing source, while also being able to form coordination with Ti atoms for protection against oxidation, resulting in the composite film exhibiting excellent oxidation resistance. Remarkably, there is no formation of TiO 2 and the emissivity only rises from 0.16 to 0.18 after 72 h in the humid heat environment. Even after prolonged exposure to 20-day humid heat, it still maintains exceptional infrared emissivity (0.24) and stealth performance (reducing the radiant temperature of the object from 94 °C to 47.4 °C, △T = 46.6 °C). In contrast, the original Ti 3 C 2 T x MXene film has lost its infrared stealth performance after 10-day humid heat (△T = 5.3 °C) with an infrared emissivity of 0.76. This paper provides a new strategy to solve the problem of MXene performance stability in humid and oxidizing environments.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wenxuan Zhao,Yiqian Du,Xiaowei Lv,Kaicheng Luo,Chunyang Xu,Min Liu,Yuetong Qian,Xiangyu Wang,Min Wang,Yuxiang Lai,Jiwei Liu,Yifeng Cheng,Ruixuan Zhang,Renchao Che
The construction of heterogeneous microstructure and the selection of multicomponents have turned into a research hotspot in developing ultralight, multifunctional, high-efficiency electromagnetic wave absorbing (EMA) materials. Although aerogels are promising materials to fulfill the above requirements, the increase in functional fillers inevitably leads to the deterioration of intrinsic properties. Tuning the electromagnetic properties from the structural design point of view remains a difficult challenge. Herein, we design customized pore creation strategies via introducing sacrificial templates to optimize the conductive path and construct the discontinuous dielectric medium, increasing dielectric loss and achieving efficient microwave absorption properties. A 3D porous composite (MEM) was crafted, which encapsulated an EVA/FeCoNi (EVA/MNPs) framework with Ti3C2Tx MXene coating by employing a direct heated cross-linking and immersion method. Controllable adjustment of the conductive network inside the porous structure and regulation of the dielectric character are achieved by porosity variation. Eventually, the MEM-5 with a porosity of 66.67% realizes RLmin of −39.2 dB (2.2 mm) and can cover the entire X band. Moreover, through off-axis electronic holography and the calculation of conduction loss and polarization loss, the dielectric property is deeply investigated, and the inner mechanism of optimization is pointed out. Thanks to the inherent characteristic of EVA and the porous structure, MEM-5 showed excellent thermal insulating and superior compressibility, which can maintain 60 °C on a 90–100 °C continuous heating stage and reached a maximum compressive strength of 60.12 kPa at 50% strain. Conceivably, this work provides a facile method for the fabrication of highly efficient microwave absorbers applied under complex conditions.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 8
·1-10
·
IF 5.3
Feng Lei,Chen Junji,Yang Min,Wang Juan,Yin Shougen,Zhang Deliang,Qin Wenjing,Song Jibin
Ti 3 C 2 T x MXene/Cu x O composites were prepared by acid etching combined with electrochemical technique. The abundant active sites on the surface of MXene greatly increase the loading of Cu x O nanoparticles, and the synergistic effect between the different components of the composite can accelerate the oxidation reaction of glucose. The results indicate that at the working potential of 0.55 V (vs. Ag/AgCl), the glucose sensor based on Ti 3 C 2 T x MXene/Cu x O composite presents large linear concentration ranges from 1 µM to 4.655 mM (sensitivity of 361 µA mM −1 cm −2 ) and from 5.155 mM to 16.155 mM (sensitivity of 133 µA mM −1 cm −2 ). The limit of detection is 0.065 µM. In addition, the sensor effectively avoids the oxidative interference of common interfering species such as ascorbic acid, dopamine and uric acid. The sensor has good reproducibility, stability and acceptable recoveries for the detection of glucose in human sweat sample (97.5-103.3%) with RSD values less than 4%. Based on these excellent properties it has great potential for the detection of glucose in real samples. Graphical abstract
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ChemistrySelect
·
2024
·Vol. 9
·期 31
·e202401727
·
IF 1.9
Dan Liu,Ying Qiu,Fengrui Yu,Guohua Zhang,Wenjuan Zhou,Qingting Ni
Graphical In the present study, the blue fluorescent L-Cys@Ti 3 C 2 MQDs are synthesized using hydrothermal methods, and the preparation process is simple, rapid, and mild. The fluorescence of L-Cys@Ti 3 C 2 MQDs can be effectively quenched by Ag + through a static quenching mechanism, demonstrating high sensitivity and excellent selectivity for Ag + detection. MXene quantum dots (MQDs), an emerging zero-dimensional nanomaterial, have garnered significant attention from researchers due to their distinctive physical and chemical properties. In this study, cysteine-functionalized Ti 3 C 2 MQDs were synthesized using a facile hydrothermal methods, resulting in the functionalized Ti 3 C 2 MQDs exhibiting intense blue fluorescence attributed to size-dependent effects and surface defects. Furthermore, the cysteine-functionalized Ti 3 C 2 MQDs exhibit excitation wavelength-dependent emission behavior and serve as a highly sensitive fluorescent probe for Ag + detection with an impressive low limit of detection (LOD) of 0.015 μM. Moreover, they demonstrate exceptional sensitivity and selectivity in determining Ag + . This study presents a novel approach for the detection of Ag + and highlights the immense potential of cysteine-functionalized Ti 3 C 2 MQDs in environmental applications.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yidan Zhang,Zhiguang Guo
Multifunctional wearable textiles can simulate human perception and convert it into visual data, which has advanced application prospects. As an important branch, thermal management wearable textiles have been widely concerned in the aspects of thermal insulation, flame retardant, photothermal anti-icing, electrothermal deicing and even water evaporation. Here, inspired by the bearing structure, we simply soaked the PET textile in Ag@MXene hybrid solution several times to form a Ag@MXene conductive network with Ag NPs as the connection point on the textile fiber, and finally carry out hydrophobic modification. Based on plasma effect, the synergistic action of Ag NPs and MXene enhances the photothermal response of the material. In addition, the addition of Ag NPs effectively reduces the stacking between MXene layers and forms a Ag@MXene conductive network with Ag NPs as the connection point on the textile fibers. The stable temperature range of PDMS/Ag@MXene PET textile is 70–80 °C under one solar illumination intensity, and the stable temperature of PDMS/Ag@MXene PET textile can reach 117 °C at a constant voltage of 3 V. Based on the excellent thermal effect, this textile achieves photothermal anti-icing, electric thermal de-icing, keeping warm and removing sweat. The textile has a water evaporation efficiency of about 0.58 g h −1 , which can achieve excellent anti-sweat function. Finally, the textile also achieved rapid flame retardant within 7 s. PDMS/Ag@MXene PET textile processes excellent photothermal and electrothermal conversion ability, acid/water stability and flame retardant ability, and has promising application prospects in thermal management textiles such as deicing and anti-icing, fire prevention, warmth and water evaporation.
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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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Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 2
·1-15
·
IF 23.2
Bi Xiaoyu,Shi Yang,Ge Shengbo,Xu Ben Bin,Li Xia,He Ximin,Huang Runzhou
Reduced graphene oxide (rGO) and MXene have garnered significant attention due to their exceptional pseudocapacitance and electrical conductivity that are viable in energy storage applications. Nevertheless, the challenge of self-restacking between the 2D material surfaces and the tendency of MXene to oxidise has posed obstacles to their further utilisation. This prompted researchers to use cellulose nanofibre (CNF) as a prospective “bridge” to connect the two materials. This approach has been shown to prevent MXene from oxidising while facilitating GO conversion into rGO via reduction. Consequently, 3D macroporous Ti 3 C 2 T x MXene/cellulose nanofibres/reduced graphene oxide (MCG) aerogels have been successfully prepared. A breakthrough in solving the self-stacking problem and creating a sensibly designed 3D macroporous electrode structure has yielded excellent electrochemical capabilities for MCG aerogel electrodes. Specifically at 1.0 mW cm −2 power density, these electrodes have demonstrated an outstanding performance in 5000 cycles with 79.4% retention rate, favourable areal specific capacitance of 671 mF cm −2 and unparalleled energy density of 60.9 mWh cm −2 . Overall, this study offers significant perspectives on the possible uses of 2D materials, especially in terms of adjusting their structure and functionality.
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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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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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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Leikai Zhao,Rui Zhang,Guixin Yang,Yuhang Wang,Shili Gai,Xin Zhao,Mengmeng Huang,Piaoping Yang
Foreseen as foundational in forthcoming oncology interventions are multimodal therapeutic systems. Nevertheless, the tumor microenvironment (TME), marked by heightened glucose levels, hypoxia, and scant concentrations of endogenous hydrogen peroxide could potentially impair their effectiveness. In this research, two-dimensional (2D) Ti3C2 MXene nanosheets are engineered with CeO2 nanozymes and glucose oxidase (GOD), optimizing them for TME, specifically targeting cancer therapy. Following our therapeutic design, CeO2 nanozymes, embodying both peroxidase-like and catalase-like characteristics, enable transformation of H2O2 into hydroxyl radicals for catalytic therapy while also producing oxygen to mitigate hypoxia. Concurrently, GOD metabolizes glucose, thereby augmenting H2O2 levels and disrupting the intracellular energy supply. When subjected to a near-infrared laser, 2D Ti3C2 MXene accomplishes photothermal therapy (PTT) and photodynamic therapy (PDT), additionally amplifying cascade catalytic treatment via thermal enhancement. Empirical evidence demonstrates robust tumor suppression both in vitro and in vivo by the CeO2/Ti3C2-PEG-GOD nanocomposite. Consequently, this integrated approach, which combines PTT/PDT and enzymatic catalysis, could offer a valuable blueprint for the development of advanced oncology therapies.
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