JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Lili Zhu,Yutong Cao,Bai Jiang,Junrong Yu,Jing Zhu,Zuming Hu
Incorporating compressibility , elasticity, and porous structures into microwave- absorbing materials will facilitate electromagnetic wave absorption (EMA) and improve environmental adaptability for practical applications. Herein, a strategy to prepare Ti 3 C 2 T x MXene/reduced graphene oxide (RGO)/ cellulose nanocrystals (CNCs) aerogels via a directed freezing method to design three-dimensional structures and strengthen the interaction between Ti 3 C 2 T x MXene and RGO lamellae is demonstrated. Oriented structures and the addition of CNCs benefit structural stability while achieving superior absorption performance by forming perfect impedance matching and multiple polarization effects. Interestingly, the prepared MXene/RGO/CNCs (MRC-20) aerogel delivers the prominent EMA performance in reported MXene-based absorbing materials, with a minimal reflection loss (RL min ) of − 72.32 dB at 12.0 GHz corresponding to a matching thickness of 2.56 mm and an effective absorption bandwidth (EAB) of 4.96 GHz at 1.88 mm with an RL min of − 59.87 GHz. Furthermore, by tuning the content of CNCs, the MRC-20 aerogel exhibits the highest stress (37.2 kPa) at 70% compressive strain and demonstrates the stability of the compression cycle. These intriguing features make the hybrid aerogel stand out among numerous absorbers.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Xinle Wang,Jin Chen,Yuzhao Ma,Jianye Shi,Yueying Wang,Xiaofeng Yang,Meidan Que,Yuxi Zhou,Yanjun Li
Two-dimensional (2D) transition metal carbide MXene (Ti 3 C 2 T x ) exhibits great potential in electromagnetic wave (EMW) absorbing materials due to its abundant surface functional groups and defects, tunable conductivity and high specific surface area. The Co@NC/TiO 2 /C composites were successfully synthesized through a solvothermal method and carbonization process using Ti 3 C 2 T x /Co-BTC as precursor. The incorporation of magnetic metal Co nanoparticles and Rutile-TiO 2 effectively addresses the issue of single loss mechanism in Ti 3 C 2 T x . The results show that CTC-100 exhibits excellent EMW absorption performance with a minimum reflection loss (RL) value of −51.3 dB at a thickness of only 1.48 mm, and the corresponding effective absorption bandwidth is (EAB, RL < −10 dB) 4.3 GHz. Simultaneously, by adjusting the matching thickness of the material from 1.29 mm to 5.0 mm, the EAB can achieve 15.42 GHz (from 2.85 GHz to 18 GHz). The excellent EMW absorption performance of CTC-100 composite is primarily attributed to the synergistic effect of magnetic loss and dielectric loss. This study provided an effective strategy for the design of Ti 3 C 2 T x -based EMW absorbing materials with high absorption intensity, reduced thickness, and broad effective absorption bandwidth (EAB).
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Small
·
2023
·Vol. 19
·期 50
·2304946
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IF 13.3
Renjie Ding,Qian Yan,Fuhua Xue,Pengyang Li,Jinhua Xiong,Xu Zhao,Zonglin Liu,Liangliang Xu,Zhong Chen,Haowen Zheng,Zhigong Tang,Qingyu Peng,Xiaodong He
The thriving 5G communication technology leads to the high demand for EMI shielding materials and thermal management materials. Particularly, portable thermal-sensitive electronic devices have more stringent requirements for thermal insulation performances. In most cases, ultrathin EMI shielding materials integrated with ultralow thermal conductivity are not easy to be achieved. To overcome this obstacle, dual protective porous composite films based on Ti 3 C 2 T x MXene and polyimide are fabricated by sacrificing polymethyl methacrylate (PMMA) templates. By optimizing the contact thermal resistance and Kapitza resistance, the composite film presents superior thermal insulation performances with a thermal conductivity of 0.0136 W m −1 K −1 . Moreover, the hybrid porous film maintains superior EMI shielding effectiveness of 63.0 dB and high SSE/t of 31651.2 dB cm 2 g −1 . Nevertheless, the excellent active and passive heating ability based on Joule heating and photothermal conversion makes the composite film an ideal portable material for thermal management. This work sheds light on designing thermal management materials and EMI shielding materials for cutting-edge electronic devices.
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JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Haiyu Luo,Nan Xu,Yanan Li,Junzhi Li,Wenlan Ji,Pei Nian,Zheng Wang,Yibin Wei
MXene nanosheets have been identified as promising building blocks for high-performance nanofiltration (NF) membranes in water purification . Herein, we report a series of amino acid-bonded Ti 3 C 2 T x MXene membranes with enhanced NF performance and antifouling properties via glycine (Gly), l -glutamic acid (L-Glu), l -lysine (L-Lys) or l -cysteine (L-Cys) modification. The physicochemical properties, separation performances and anti-fouling behaviors of the pure Ti 3 C 2 T x MXene membrane, Gly-, L-Glu-, L-Lys- and L-Cys-bonded Ti 3 C 2 T x MXene membranes were comparatively investigated. The stable Ti–N bonds were found between the amino acids and the MXene nanosheets and different amino acids lead to different properties of the corresponding membranes. While maintaining ultra-high rejections to various organic dyes, all the amino acid functionalized membranes exhibited enhanced water permeability (7.17–13.11 L·m −2 ·h −1 ·bar −1 ) compared with that of the pure MXene membrane. Importantly, the Gly-bonded membrane showed the optimal separation performance with high salt rejections of 86.28%, 81.36%, 72.88% and 66.82% to MgSO 4 , MgCl 2 , Na 2 SO 4 and NaCl, respectively, and the membrane also exhibited superior anti-fouling property with a flux recovery rate of 80.59% to bovine serum albumin (BSA). The separation mechanism was further revealed which may offer a simple yet efficient way for enhancing 2D MXene-based NF membranes.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Shuyi Shen,Kun Yang,Daohui Lin
The biomolecular responses of bacteria to 2D nanosheets that result from nano–bio interfacial interactions remain to be thoroughly examined. Herein, Fourier transform infrared (FTIR) multivariate and 2D correlation analyses were performed to assess the composition and conformational changes in bacterial biomacromolecules (lipids, polysaccharides, and carbohydrates) upon exposure to Ti3C2Tx nanosheets. General toxicity assays, 3D excitation–emission matrix fluorescence analyses, extended Derjaguin–Landau–Verwey–Overbeek theory interaction calculations, and isothermal titration calorimetry were also performed. Our results demonstrate that Ti3C2Tx nanosheets considerably impact Gram-positive bacteria (Bacillus subtilis), causing oxidative damage and inactivation by preferentially interacting with and disrupting the cell walls. The bilayer membrane structure of Gram-negative bacteria (Escherichia coli) endows them with increased resistance to Ti3C2Tx nanosheets. The unmodified nanosheets had a higher affinity to bacterial protein components with lower toxicity due to their susceptibility to oxidation. Surface modification with KOH or hydrazine (HMH), particularly HMH, induced stronger dispersion, antioxidation, and affinity to bacterial phospholipids, which resulted in severe cell membrane lipid peroxidation and bacterial inactivation. These findings provide valuable insight into nano–bio interfacial interactions, which can facilitate the development of antimicrobial and antifouling surfaces and contribute to the evaluation of the environmental risks of nanomaterials.
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ACS Nano
·
2023
·
IF 17.1
Fu-Lin Gao,Ji Liu,Xiao-Peng Li,Qian Ma,Tingting Zhang,Zhong-Zhen Yu,Jie Shang,Run-Wei Li,Xiaofeng Li
Although skin-like sensors that can simultaneously detect various physical stimuli are of fair importance in cutting-edge human–machine interaction, robotic, and healthcare applications, they still face challenges in facile, scalable, and cost-effective production using conventional active materials. The emerging two-dimensional transition metal carbide, Ti3C2Tx MXene, integrated with favorable thermoelectric properties, metallic-like conductivity, and a hydrophilic surface, is promising for solving these problems. Herein, skin-like multifunctional sensors are designed to precisely detect and distinguish temperature and pressure stimuli without cross-talk by decorating elastic and porous substrates with MXene sheets. Because the combination of the thermoelectric and conductive MXene with the thermally insulating, elastic, and porous substrate integrates efficient Seebeck and piezoresistive effects, the resultant sensor exhibits not only an ultralow detection limit (0.05 K), high signal-to-noise ratio, and excellent cycling stability for temperature detection but also high sensitivity, fast response time, and outstanding durability for pressure detection. Based on the impressive dual-mode sensing properties and independent temperature and pressure detections, a multimode input terminal and an electronic skin are created, exhibiting great potential in robotic and human–machine interaction applications. This work provides a scalable fabrication of multifunctional tactile sensors for precisely detecting and distinguishing temperature and pressure stimuli.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Dongjie Jia,Xianyu Li,Rongyan Cai,Bochao Ma,Qixian Zhao,Tonglin Chigan,Peipei Yang
Two-dimensional MXene and its composites are among the most attractive electromagnetic wave absorption (EMA) materials due to their unique structure. While previous studies have investigated 2D/2D MoS 2 /Ti 3 C 2 T x heterojunctions for EMA, there is still a need for further adjustments to interface structure to enhance polarized electron density and electron transfer capacity. In this study, Cl-Ti 3 C 2 T x was prepared by Lewis acid molten salt etching of Ti 3 AlC 2 , and S-Ti 3 C 2 T x was prepared by replacing Cl with S. MoS 2 nanosheets were grown on the surface of S-Ti 3 C 2 T x by a simple hydrothermal method, forming a Ti-S-Mo covalent interface. The EMA properties of the composites were further optimized by adjusting the interface oriented polarization and electronic structure through Ni doping. Compared to MoS 2 /TiO 2 /Ti 3 C 2 T x , the electromagnetic wave absorption performance of Ni-MoS 2 /TiO 2 /Ti 3 C 2 T x had been significantly improved. When the Ni doping amount was 0.086 mmol, the minimum reflection loss of Ni-MoS 2 /TiO 2 /Ti 3 C 2 T x could reach −48.04 dB at 8.64 GHz, with an effective absorption bandwidth of 3.28 GHz. This study provides theoretical basis and experimental evidence for the follow-up research of MXene-based composite EMA materials.
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Science Bulletin
·
2023
·
IF 18.9
Weikang Wang,Yan Bai,Pin Yang,Shuai Yuan,Feiyang Li,Weiwei Zhao,Beibei Jin,Xuan Zhang,Shujuan Liu,Daqiang Yuan,Qiang Zhao
Chemical transformation strategy is capable of fabricating nanomaterials with well-defined structures and fascinating performance via controllable crystallization kinetics in the phase transformation. V 2 CT x MXene has been used as precursors to fabricate vanadium porphyrin metal–organic frameworks (V-PMOFs) via the coordination of deprotonated carboxylic acid ligands. However, the rational and in-depth exploration of synthesis mechanism with the aim of enriching the variety of MXene (i.e., Ti 3 C 2 T x ) and organic ligands (i.e., catechol-based) to design new MOFs is rarely reported. Herein, we have first developed a metal ion assistant transformation strategy to synthesize three-dimensional catechol-based TiCu-HHTP (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) MOFs with a non-interpenetrating SrSi 2 ( srs ) framework using two-dimensional Ti 3 C 2 T x as precursors. The unique synergetic transformation mechanism involves the electron transfer from Ti 3 C 2 T x to electrostatically adsorbed Cu 2+ ion for redox reaction , the subsequent Ti–C bond rupture for Ti 4+ ion release , and the continuous chelation coordination between Ti 4+ /Cu 2+ and HHTP. Ti 3 C 2 T x precursors and auxiliary metal ion could be rationally substituted by V 2 CT x and M n + (e.g., Ni 2+ , Co 2+ , Mn 2+ , and Zn 2+ ), respectively. This strategy lays the foundation for the design and synthesis of innovative and multifarious MOFs derived from MXene or other unconventional metal precursors .
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Jiuao Wang,Zhen He,Zongliang Du,Xu Cheng,Haibo Wang,Xiaosheng Du
Phase change materials (PCMs) with superior solar-thermal harvest and efficient infrared stealth have crucial significance for modern military wearable thermal management but suffer from liquid leakage, poor motion detection, and intrinsic solid rigidity of conventional solid–liquid PCMs. In this work, highly stretchable phase change films (MPSPCFs) with sensitive motion detection, superior solar-thermal harvest, and efficient infrared stealth were designed using Ti3C2Tx MXene nanosheets, silicone rubber elastomers, n-eicosane, and poly(vinyl alcohol). The MPSPCF exhibited excellent energy storage density (107.1 J/g), long-term thermal reversibility (100 cycles), and superior flexibility. The lamination of MPSPCF with natural cotton fabrics enabled effective infrared stealth for thermal targets. Furthermore, due to the introduction of the MXene/PVA layer, the MPSPCF processed excellent solar-thermal conversion efficiency (η = 86.7%) and sensitive strain sensing (GF = 4.45). The MPSPCF-based thermoelectric power generation system was designed, which generated a maximum power of 91.95 mW. The MPSPCF could also be utilized as a strain sensor to detect human movement, including the bending motion of the finger, wrist, elbow, and knee. Combining these multiple functions, the MPSPCF developed in this work has great potential for personal thermal management applications in both military and civil fields, offering new ideas for the design of advanced PCM composites.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Dong Chen,Tianjiao Zhu,Shen Shen,Yongan Cao,Yangyang Mao,Wenju Wang,Encai Bao,Hongfu Jiang
Lithium-sulfur (Li-S) batteries are regarded as highly prospective energy storage devices. However, problems such as low sulfur utilization, poor cycle performance, and insufficient rate capability hinder the commercial development of Li-S batteries. Three-dimensional (3D) structure materials have been applied to modify the separator of Li-S batteries to suppress the diffusion of lithium polysulfides (LiPSs) and inhibit the transmembrane diffusion of Li + . A vanadium sulfide/titanium carbide (VS 4 /Ti 3 C 2 T x ) MXene composite with a 3D conductive network structure has been synthesized in situ by a simple hydrothermal reaction . VS 4 is uniformly loaded on the Ti 3 C 2 T x nanosheets through vanadium-carbon(V-C) bonds, which effectively inhibits the self-stacking of Ti 3 C 2 T x . The synergistic action of VS 4 and Ti 3 C 2 T x substantially reduces the shuttle of LiPSs, improves interfacial charge transfer, and boosts the kinetics of LiPSs conversion, consequently increasing the rate performance and cycle stability of the battery . The assembled battery has a specific discharge capacity of 657 mAh g -1 after 500 cycles at 1C, with a high capacity retention rate of 71%. The construction of VS 4 /Ti 3 C 2 T x composite with a 3D conductive network structure provides a feasible strategy for the application of polar semiconductor materials in Li-S batteries. It also provides an effective solution for the design of high-performance Li-S batteries.
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ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Yuxuan Zhang,Jun Luo,Biao Feng,Hongxia Xu,Yuanyuan Sun,Xueyuan Gu,Xin Hu,Mu Naushad,Bin Gao,Hongqiang Ren
MXenes are considered as an emerging class of two-dimensional (2D) adsorbent for various environmental applications. In this work, two different morphologies of Ti 3 C 2 T x MXene (multilayer (ML-Ti 3 C 2 T x ) and delaminated titanium carbide (DL-Ti 3 C 2 T x )) were prepared through mild in situ HF etching and further delamination . The structural differences between the two were explored with a focus on their effects on the performance and mechanism of removing heavy metals from water. In comparison to ML-Ti 3 C 2 T x , DL-Ti 3 C 2 T x had more oxygen-containing functional groups, higher specific surface area (19.713 vs. 8.243 m 2 /g), larger pore volume (0.135 vs. 0.040 cm 3 /g), higher maximum Pb(II) adsorption capacity (77.0 vs. 56.68 mg/g), but lower maximum Cu(II) adsorption capacity (23.08 vs. 55.46 mg/g). Further investigation revealed that the removal of Pb(II) by the MXenes was mainly controlled through electrostatic attraction and surface complexation mechanisms, while Cu(II) was removed mainly through surface reduction by Ti-related groups. Because delamination of ML-Ti 3 C 2 T x increased the surface area and surface functional groups, DL-Ti 3 C 2 T x became a better sorbent for Pb(II) in water. During sonication, however, delamination inevitably led to partial oxidation of Ti 3 C 2 T x nanosheets and thus weakened the reducing ability of DL-Ti 3 C 2 T x for Cu(II) in water. Nevertheless, both ML- and DL-Ti 3 C 2 T x not only exhibited excellent heavy metal adsorption capacity under different solution conditions, but also showed good reusability. Findings of this study indicate that Ti 3 C 2 T x MXenes are promising adsorbents for treating heavy metal pollutants in water.
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TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Jinglun Guo,Zhenling Shang,Yue Sun,Chenghao Li,Jianyi Xia,Yuxin Zou,Kang Du,Guoqiang Liu,Feng Zhou,Weimin Liu
Perfluoropolyether (PFPE) lubricant is widely used in plenty of cutting-edge technologies because of its extraordinary properties. However, poor boundary lubrication and creep limit their further applications. Here, we demonstrated a PFPE supramolecular gel with surface-functionalized Ti 3 C 2 T x as additives for highly efficient boundary lubrication and prevention of creep. It turned into an oily liquid at 124.5 °C, accompanied by a rapid decrease in viscosity. Additionally, the phase transition could be achieved by shear stress. This kind of gel reduced wear volume by 90.75% compared with pure PFPE oil. Its friction coefficient (∼0.113) varied slightly with time. Notably, its load-bearing capacity exceeded 1500 N. This work puts forward an approach to the preparation of PFPE-based supramolecular gel lubricant with surface-functionalized Ti 3 C 2 T x additive.
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危险品化学品经营许可证（带存储）