JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Na Chu,Chunjia Luo,Xushuai Chen,Liuxin Li,Chaobo Liang,Min Chao,Luke Yan
With the development of electronic products to miniaturization and high frequency, high-performance flexible electromagnetic interference (EMI) shielding materials are urgently needed to deal with electromagnetic pollution. Two-dimensional transition metal carbide/polyimide (Ti 3 C 2 T x MXene/PI) films were synthesized by in situ polymerization and a simple scratch method in this paper. The Ti 3 C 2 T x MXene nanosheets give the films good EMI shielding effectiveness (SE) and electrical conductivity . Specifically, the film with a thickness of 0.11 mm (Ti 3 C 2 T x content of 30 wt%) exhibits an EMI SE of 34.73 dB and a specific EMI SE (SE/thickness) of 315.73 dB/mm in the frequency range of 8.2–12.4 GHz (X-band). In addition, the films have a tensile strength of 67.58 MPa, and a high decomposition temperature of 510 ℃ in N 2 atmosphere. Therefore, we believe that the prepared Ti 3 C 2 T x /PI films with good comprehensive performance have enormous potential in the field of lightweight and flexible EMI shielding materials.
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Nanomaterials
·
2023
·Vol. 13
·期 6
·958
·
IF 5.3
Xiaofang Liu,Hongchi Xie,Shi Zhuo,Yuanhong Zhou,Mohamed S. Selim,Xiang Chen,Zhifeng Hao
For a long time, the emergence of microbial drug resistance due to the abuse of antibiotics has greatly reduced the therapeutic effect of many existing antibiotics. This makes the development of new antimicrobial materials urgent. Light-assisted antimicrobial therapy is an alternative to antibiotic therapy due to its high antimicrobial efficiency and non-resistance. Here, we develop a nanocomposite material (Ru@MXene) which is based on Ru(bpy)(dcb)2+connected to MXene nanosheets by ester bonding as a photothermal/photodynamic synergistic antibacterial material. The obtained Ru@MXene nanocomposites exhibit a strengthened antimicrobial capacity compared to Ru or MXene alone, which can be attributed to the higher reactive oxygen species (ROS) yield and the thermal effect. Once exposed to a xenon lamp, Ru@MXene promptly achieved almost 100% bactericidal activity againstEscherichia coli(200 μg/mL) andStaphylococcus aureus(100 μg/mL). This is ascribed to its synergistic photothermal therapy (PTT) and photodynamic therapy (PDT) capabilities. Consequently, the innovative Ru@MXene can be a prospective non-drug antimicrobial therapy that avoids antibiotic resistance in practice. Notably, this high-efficiency PTT/PDT synergistic antimicrobial material by bonding Ru complexes to MXene is the first such reported model. However, the toxic effects of Ru@MXene materials need to be studied to evaluate them for further medical applications.Keywords:MXene;Ru complex;PTT/PDT;antimicrobial
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Polymers
·
2023
·Vol. 15
·期 6
·1330
·
IF 5
Kun Hou,Yafeng Yang,Hu Zhou,Xiangmeng Chen,Shengbo Ge
Water pollution has spurred the development of membrane separation technology as a potential means of solving the issue. In contrast to the irregular and asymmetric holes that are easily made during the fabrication of organic polymer membranes, forming regular transport channels is essential. This necessitates the use of large-size, two-dimensional materials that can enhance membrane separation performance. However, some limitations regarding yield are associated with preparing large-sized MXene polymer-based nanosheets, which restrict their large-scale application. Here, we propose a combination of wet etching and cyclic ultrasonic-centrifugal separation to meet the needs of the large-scale production of MXene polymers nanosheets. It was found that the yield of large-sized Ti3C2TxMXene polymers nanosheets reached 71.37%, which was 2.14 times and 1.77 times higher than that prepared with continuous ultrasonication for 10 min and 60 min, respectively. The size of the Ti3C2TxMXene polymers nanosheets was maintained at the micron level with the help of the cyclic ultrasonic-centrifugal separation technology. In addition, certain advantages of water purification were evident due to the possibility of attaining the pure water flux of 36.5 kg m−2h−1bar−1for the Ti3C2TxMXene membrane prepared with cyclic ultrasonic-centrifugal separation. This simple method provided a convenient way for the scale-up production of Ti3C2TxMXene polymers nanosheets.Keywords:Ti3C2TxMXene;yield;polymers nanosheets;cyclic ultrasonic-centrifugal separation
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Luyang Liang,Gaojie Han,Yang Li,Biao Zhao,Bing Zhou,Yuezhan Feng,Jianmin Ma,Yaming Wang,Rui Zhang,Chuntai Liu
Electromagnetic (EM) pollution affecting people’s normal lives and health has attracted considerable attention in the current society. In this work, a promising EM wave absorption and shielding material, MXene/Ni hybrid, composed of one-dimensional Ni nanochains and two-dimensional Ti3C2Tx nanosheets (MXene), is successfully designed and developed. As expected, excellent EM wave absorption and shielding properties are obtained and controlled by only adjusting the MXene content in the hybrid. A minimum reflection loss of −49.9 dB is obtained only with a thickness of 1.75 mm at 11.9 GHz when the MXene content is 10 wt %. Upon further increasing the MXene content to 50 wt %, the optimal EM shielding effectiveness (SE) reaches 66.4 dB with an absorption effectiveness (SEA) of 59.9 dB. Mechanism analysis reveals that the excellent EM wave absorption and shielding performances of the hybrid are contributed to the synergistic effect of conductive MXene and magnetic Ni chains, by which, the dielectric properties and electromagnetic loss can be easily controlled to obtain appropriate impedance matching conditions and good EM wave dissipation ability. This work provides a simple but effective route to develop MXene-based EM wave absorption and shielding materials. A universal guideline for designing the absorbing and shielding materials for the future is also proposed.
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Biomaterials Advances
·
2024
·
IF 5.5
Hongling Zhou,Yifan Zhao,Xiangjun Zha,Zhengmin Zhang,Linli Zhang,Yeke Wu,Ruiyang Ren,Zhihe Zhao,Wei Yang,Lixing Zhao
Guided bone regeneration (GBR) stands as an essential modality for craniomaxillofacial bone defect repair, yet challenges like mechanical weakness, inappropriate degradability, limited bioactivity, and intricate manufacturing of GBR membranes hindered the clinical efficacy. Herein, we developed a Janus bacterial cellulose(BC)/MXene membrane through a facile vacuum filtration and etching strategy. This Janus membrane displayed an asymmetric bilayer structure with interfacial compatibility, where the dense layer impeded cell invasion and the porous layer maintained stable space for osteogenesis. Incorporating BC with Ti 3 C 2 Tx MXene significantly enhanced the mechanical robustness and flexibility of the material, enabling clinical operability and lasting GBR membrane supports. It also contributed to a suitable biodegradation rate, which aligned with the long-term bone repair period. After demonstrating the desirable biocompatibility, barrier role, and osteogenic capability in vitro , the membrane's regenerative potential was also confirmed in a rat cranial defect model. The excellent bone repair performance could be attributed to the osteogenic capability of MXene nanosheets, the morphological cues of the porous layer, as well as the long-lasting, stable regeneration space provided by the GBR membrane. Thus, our work presented a facile, robust, long-lasting, and biodegradable BC/MXene GBR membrane, offering a practical solution to craniomaxillofacial bone defect repair.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Tian Zhang,Limei Pan,Huan Tang,Fei Du,Yanhua Guo,Tai Qiu,Jian Yang
Herein, enhanced exfoliation and large-scale delamination of two-dimensional (2D) Ti 3 C 2 T x MXene using etchant of HCl + LiF, instead of HF, in which both etching and intercalation were achieved in exfoliation process, were thoroughly investigated with the focus on the effects of two critical factors, reaction temperature and washing solution. Increasing etching temperature promotes the exfoliation process, i.e., the transformation from Ti 3 AlC 2 to multilayer Ti 3 C 2 T x MXene, whereas simultaneously results in an aggravated surface oxidation of MXene layers formed after the extraction of Al. As a result, delamination ratio increases firstly and then decreases, and the samples etched at 35 °C show the highest delamination ratio. Compared with the distilled water, washing the exfoliation products using ethanol significantly improves the delamination ratio of Ti 3 C 2 T x MXene by co-intercalation of larger alcohol molecule and more impurity ions and a large scale delamination of Ti 3 C 2 T x MXene with a delamination ratio as high as 29.2% was obtained by simple sonication for 1 h, without additional intercalation step required, after washing using ethanol. The possible exfoliation reactions by HCl + LiF solution were proposed. Using the as-fabricated stable suspensions of delaminated Ti 3 C 2 T x flakes, flexible, free-standing Ti 3 C 2 T x papers with tailored thickness, hydrophilic surface and excellent conductivity, typically 2 × 10 5 S/m at 5 μm in thickness, were prepared. As anode for lithium ion batteries , the delaminated Ti 3 C 2 T x MXene obtained reversible capacities of 226.3 mAh g −1 , 137.9 mAh g −1 ,102.0 mAh g −1 and 47.9 mAh g −1 respectively at the current density of 100, 300, 1000 and 3000 mA g −1 , which are superior to those of the Ti 3 C 2 MXene prepared by conventional HF process.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 17
·6086-6097
·
IF 5.7
Yuanhao Ning,Shuang Yang,Xianxian Sun,Shasha Wang,Lei Liang,Yuanjing Cheng,Ye Yuan,Yibin Li
Transition metal carbides and nitrides (MXenes) with excellent properties have broad prospects in electromagnetic wave absorption (EMA). In this paper, a unidirectional freeze-casting method was utilized to design a double-layer MXene absorber with orthogonal microstructures. The perpendicular and parallel samples (associated with the unidirectional freeze-casting direction), perform their respective roles in the designed double-layer absorber. The perpendicular sample with various attenuation techniques is employed as an electromagnetic wave attenuation layer, while the parallel sample with good impedance matching conditions is utilized as an impedance matching layer. Consequently, the entire absorber exhibits favorable EMA characteristics. Upon incidence of electromagnetic waves onto the parallel terminus, it is observed that the sample measuring 4.6 mm in thickness exhibits a minimal reflection loss (RLmin) of −60.8 dB at a frequency of 6.63 GHz, with a parallel end thickness accounting for 25%. In addition, the sample with a thickness of 2.6 mm displays a noteworthy maximal effective absorption bandwidth (EAB) amounting to 9.4 GHz, given a parallel end thickness of 20%. A thorough analysis of the impedance matching conditions and electromagnetic wave attenuation mechanisms of each sample reveals that the double-layer MXene absorbers with orthogonal microstructures can significantly increase the viability of MXenes in EMA.
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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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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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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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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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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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