CEMENT & CONCRETE COMPOSITES
·
2023
·
IF 10.5
Zhichao Xu,Huayang Sun,Yanlin Huo,Minjie Jia,Zhitao Chen,Yingzi Yang
MXene is a new two-dimensional transition metal carbide/nitride with remarkable hydrophilicity , which has been widely applied in multifunctional coatings . In this study, Ti 3 C 2 T x MXene was synthesized by LiF/HCl solution etching of Ti 3 AlC 2 and used to modify the surface of polyethylene (PE) fiber, enhancing the interfacial properties between fiber and matrix and further improving the tensile properties of strain hardening cementitious composites (SHCC). The tensile stress and strain of SHCC incorporating the MXene-coated PE (MXene@PE) fiber increased by 18.73 % and 93.60 %, respectively, accompanied by reduced crack width and crack spacing. Single fiber pullout results showed that the frictional bond strength increased by 71.35 % due to the strong chemical bond between fiber and matrix. The microstructure of MXene@PE fiber and bonding properties were characterized by SEM/EDS, FTIR, and XPS. The MXene was proved to have a dual effect of bonding to PE fiber and to C–S–H via covalent and hydrogen bonds .
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Na Shi,Jiakun Wu,Xingyu Zhi,Nan Li,Zhining Wang
As a green and economical energy, nuclear power plays a significant role in the global energy supply. Uranium extraction from seawater is a highly promising strategy to utilize unconventional uranium resources and ensure the sustainability of the nuclear industry. However, the current uranium absorbents still suffer from long extraction time, low adsorption capacity, and poor selectivity. In this study, an amidoxime-functionalized cellulose nanofibers/MXene aerogel (MCA) with a three-dimensional porous structure was fabricated for efficient uranium extraction from seawater through electro-/physicochemical adsorption processes. The abundant porous structures and functional groups endowed the MCA with a high adsorption capacity of 515.46 mg/g in the physicochemical adsorption process. Furthermore, the MCA adsorbed 13.82 mg/g of uranium from natural seawater after 28 days with a superior selectivity for uranyl ions. Encouragingly, the uranium extraction performance was significantly boosted via the assistance of an electric field. By applying a voltage of 1.0 V, the MCA presented an improved extraction capacity of 1826.38 mg/g and accelerated adsorption kinetic. Meanwhile, the MCA electrode possessed good stability and high reusability of 84.30% after five adsorption–desorption cycles, which insured that MCA was a promising uranium adsorbent in long-term application. This work offers a universal paradigm for the design of highly efficient electro-adsorbents and also expands the scope of external field enhancement in the area of uranium extraction.
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Nano Research
·
2023
·
IF 9.9
Yao Junru,Zhou Jintang,Yang Feng,Peng Guiyu,Liu Yijie,Yao Zhengjun,Wu Fan,Zeng Haibo
The development of multifunctional materials and synergistic applications of various functions are important conditions for integrated and miniaturized equipment. Here, we developed asymmetric MXene/aramid nanofibers/polyimides (AMAP) aerogels with different modules using an integrated molding process. Cleverly asymmetric modules (layered MXene/aramid nanofibers section and porous MXene/aramid nanofibers/polyimides section) interactions are beneficial for enhanced performances, resulting in low reflection electromagnetic interference (EMI) shielding (specific shielding effectiveness of 2483 (dB·cm 3 )/g and a low R -value of 0.0138), high-efficiency infrared radiation (IR) stealth (ultra-low thermal conductivity of 0.045 W/(m·K) and IR emissivity of 0.32 at 3–5 µm and 0.28 at 8–14 µm), and excellent thermal management performances of insulated Joule heating. Furthermore, these multifunctional AMAP aerogels are suitable for various application scenarios such as personal and building protection against electromagnetic pollution and cold, as well as military equipment protection against infrared detection and EMI.
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Materials Today Sustainability
·
2023
·
IF 7.8
X. Zang,Y. Qin,M. Gu,Y. Sun,D. Huang,J. Ji,M. Xue
Efficient utilization of solar energy is a resultful strategy to solve the problem of shortage of traditional fossil energy. Solar-driven water evaporation is considered as an effective, low-cost, renewable, and environment-friendly technology for clean water production. Herein, a novel MXene/ANF composite film was fabricated by facile vacuum filtration method. Benefiting from the excellent photothermal conversion property of MXene and the flexibility and stability of ANF , the MXene/ANF composite film exhibits high-efficient photothermal conversion and water evaporation ability. The as-prepared MXene/ANF composite film can reach as high as 98.0 °C at the laser power density of 1 kW/m 2 and 54.0 °C under the solar power density of 1 kW/m 2 . Meanwhile, the water evaporation of MXene/ANF composite film can reach 1.432 kg/m 2 under the solar power density of 1 kW/m 2 . Therefore, the MXene/ANF composite films possess a good prospect to be applied as a solar-driven water evaporation device to solve the problem of shortage of traditional fossil energy and inadequate freshwater supply.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Guoyu Yang,Xuming Yao,Yujun Li,Yi Hu,Xing Chen,Jialiang Li,Junzhen Chen,Jianjun Jiang
Owing to its excellent electronic properties, Ti3C2Tx MXene is an emerging class of two-dimensional nanomaterials that have a promising electromagnetic (EM) wave function; however, poor impedance matching has limited the application of these materials in absorption-dominated EM interference (EMI) shielding. Hence, the investigation of thin MXene nanosheet-based film materials for application to absorption-dominated EMI shielding, which produces less EM pollution than reflection-dominated EMI shielding materials, is essential. In this study, a Ti3C2Tx/carbonyl iron–aramid hybrid film possessing absorption-dominated EMI shielding properties was prepared by using flower-like core–shell Ti3C2Tx/carbonyl iron microspheres (Ti3C2Tx/CIs) and aramid nanofibers. In the X band, the EMI shielding effectiveness of the films reached 31.9 dB with a lower SER value (below 3 dB), which means that less than 50% of the reflected incident waves and secondary EM pollution were reduced by the EMI shielding film materials. These results were attributed to superior impedance matching and multiple dissipation mechanisms of the Ti3C2Tx/CIs nanocomposites, which substantially enhanced the EM-wave absorption properties of a single MXene. The experimental results indicated that Ti3C2Tx/CIs nanocomposites showed a minimum reflection loss of −50.8 dB at 7.84 GHz. Moreover, a maximum effective absorption bandwidth of 5.5 GHz (12.48–18 GHz) was obtained at 1.60 mm, almost covering the entire Ku band. Therefore, this work provides a framework for designing MXene-based absorption-dominated EMI shielding nanocomposites.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoyan Xiong,Lijiu Cao,Siyi Li,Xuqi Hu,Guoqiang Liu,Yunpeng Gong,Yufang Chen,Tao Jin
In this study, a composite heterojunction material of Ti 3 C 2 Tx MXene nanosheets with Co 9 S 8 @In 2 S 3 nanoparticles , named (Co 9 S 8 @In 2 S 3 )/MXene, was constructed using a hydrothermal method . The materials were characterized and analyzed in terms of morphology, structure, and selective response properties to triethylamine gas. The materials were characterized by SEM, TEM, HAADF, STEM, XRD , XPS, BET, and other tests. The results showed a response value of 44.9 for (Co 9 S 8 @In 2 S 3 )/20% MXene at 350 °C and 20 ppm triethylamine (TEA), with a response/recovery time of 63 s/115 s respectively. In particular, (Co 9 S 8 @In 2 S 3 )/MXene exhibits excellent immunity to interference and a highly stable adsorption/desorption process with almost no noise interference. In addition, the (Co 9 S 8 @In 2 S 3 )/MXene material showed stable and fast selective response to TEA in different types of gas mixtures compared with the commonly used single TEA selective response study method. The results of this study provide valuable techniques and theories for the Environmental protection application of TEA selective response materials. Finally, this article performs a comparative analysis on the mechanism of selection response and stability of (Co 9 S 8 @In 2 S 3 )/MXene materials, and concludes that the process determining the specific response of (Co 9 S 8 @In 2 S 3 )/MXene materials to particular gas molecules includes three processes: shape-selective adsorption, redox reaction , and charge carrier conduction.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Liangliang Xu,He Chen,Pingyu Zheng,Haowen Zheng,Zhong Chen,Zonglin Liu,Pengyang Li,Xu Zhao,Qingyu Peng,Xiaodong He
Two-dimensional transition-metal carbides and nitrides (MXenes) show great potential in aerogel flexible piezoresistive sensors owing to their versatile surface chemistry, high carrier mobility, outstanding metallic conductivity, and adjustable interlayer spacing under applied stress. However, the pure MXene aerogel exhibits significant plastic deformation or brittle mechanical performance due to the weak interactions between the nanosheets. Herein, a series of MXene/polyimide/silver nanowire composite aerogels with aligned lamellar microstructure are fabricated by bidirectional freezing and annealing strategies. The introduction of polyimide (PI) and silver nanowires (AgNWs) significantly improves the mechanical properties of the MXene-based aerogel. The obtained lightweight composite aerogel shows superelasticity with large reversible compressibility, excellent stability, and outstanding fatigue resistance. Moreover, owing to the highly aligned lamellar microstructure of the composite aerogel and the excellent conductivity of MXene and AgNWs, the composite aerogel exhibits great sensing performance with high sensitivity (gauge factor ∼27.8) and ultralow detection limit (<0.6 Pa). Based on the MXene/PI/AgNW composite aerogels, a series of wearable sensor applications are demonstrated.
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Nanomaterials
·
2023
·Vol. 13
·期 18
·2608
·
IF 5.3
Xiaoai Ye,Xu Zhang,Xinsheng Zhou,Guigen Wang
Lightweight, flexible, and electrically conductive thin films with high electromagnetic interference (EMI) shielding effectiveness and excellent thermal management capability are ideal for portable and flexible electronic devices. Herein, the asymmetric and multilayered structure Ag-MXene/ANFs composite papers (AMAGM) were fabricated based on Ag-MXene hybrids and aramid nanofibers (ANFs) via a self-reduction and alternating vacuum-assisted filtration process. The resultant AMAGM composite papers exhibit high electrical conductivity of 248,120 S m−1, excellent mechanical properties with tensile strength of 124.21 MPa and fracture strain of 4.98%, superior EMI shielding effectiveness (62 dB), ultra-high EMI SE/t (11,923 dB cm2g−1) and outstanding EMI SE reliability as high as 96.1% even after 5000 cycles of bending deformation benefiting from the unique structure and the 3D network at a thickness of 34 μm. Asymmetric structures play an important role in regulating reflection and absorption of electromagnetic waves. In addition, the multifunctional nanocomposite papers reveal outstanding thermal management performances such as ultrafast thermal response, high heating temperatures at low operation voltage, and high heating stability. The results indicate that the AMAGM composite papers have excellent potential for high-integration electromagnetic shielding, wearable electronics, artificial intelligence, and high-performance heating devices.Keywords:Ag-MXene/ANFs nanocomposite papers;asymmetric structure;EMI shielding;Joule heating performance
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 40
·13874-13885
·
IF 6.4
Haoze Yuan,Peixing Li,Xinyu Wang,Cheng Yu,Xin Wang,Jutao Sun
Developing wearable sensors with high conductivity, stretchability, self-healing ability and good mechanical properties remains a considerable challenge. Aimed at addressing this problem, a novel strategy is proposed by constructing electronic conductive networks (MXene nanosheets) in an ionic conductive matrix (a polymerizable deep eutectic solvent). The AC conductivity at different frequencies indicated that the dual conductive networks were formed when the loading of the MXene reached 0.2 wt%. The formation of dual conductive networks was beneficial to the conductive properties and mechanical properties. The prepared sensor exhibited excellent sensing performance, such as high sensitivity, reliability and stretchability. Furthermore, the sensor had good self-healing ability due to many hydrogen bonding interactions between the PDES and MXene. The self-healing efficiency reached 75.2% for tensile strength and 87.1% for elongation at break when kept at 60 °C and 10% humidity for 4 h. Besides its excellent sensing performance, the sensor also had other advantages, such as anti-freezing at −20 °C, good adhesion with various substrates, and complete recyclability in water. The prepared sensor was successfully used in motion detection of human bodies and easily distinguished the motion of walking, jogging and running by the peak intensity, peak shape and frequency.
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ACS Applied Polymer Materials
·
2023
·
IF 5
Ye Sun,Wanying Yang,Lianchun Zou,Lixian Sun,Fan Yang,Hongbo Dang,Yanhua Yang,Dong Jiang
Nanofiltration is a membrane separation technology that efficiently separates neutral/charged solutes with little energy consumption. Reusing or treating wastewater is one of the most efficient ways to help the environment. When it comes to concentration polarization, membrane fouling, and selective permeation, however, commercial thin film composite (TFC) nanofiltration membranes exhibit more severe trade-off effects. Here, we build a TFN membrane by dispersing tannic acid (TA)-functionalized MXene (Ti3C2TX) nanosheets into the aqueous phase and incorporating them into the polyamide surface layer by interfacial polymerization. The produced membrane has been shown by a number of chemical and structural investigations to be not only porous, hydrophilic, and negatively charged but also capable of constructing transport channels in the separating layer, hence lowering the barrier to mass transfer. Changes in TA/MXene ratio and MXene nanosheet concentration allowed for fine-tuning of TMNF-TFNs membrane characteristics. Specifically, the results show that the enhanced membrane has a high water flow of 16.6 L m–2 h–1 bar–1 and a high rejection rate of divalent ions (MgSO4, Na2SO4). Important for real-world applications, the TMNF-TFN membrane also displays outstanding antifouling durability and long stability.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Ya Yi,Xuhui Chen,Shiyi Feng,Binxia Chen,Canhui Lu,Zehang Zhou
Multifunctional hydrogels with desirable mechanical properties have attracted extensive attention in flexible electronic devices. Herein, tough and robust Ti 3 C 2 T x MXene/polyvinyl alcohol (PVA) composite cryogel with excellent flexibility is prepared via a cyclic freeze–thaw (F-T) method. The morphological and crystalline structure of the composite cryogel is regulated by the phase separation process during fabrication, which greatly contributes to the enhanced mechanical properties. The highly flexible and stretchable MXene/PVA cryogel exhibits sensitive and reliable responses to deformations, demonstrating promising application in the detection of human motions and smart coding. Furthermore, the composite cryogel presents a high absorption-dominated electromagnetic interference (EMI) shielding effectiveness of 25 dB at an ultralow MXene loading of 0.04 wt%, which is ascribed to the synergetic effect of its tunable porous structure and water-rich environment. These findings provide valuable insights into the design and fabrication of high-performance multifunctional hydrogels.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yujin Zhang,Kailing Zhou,Chunyu Yuan,Huijun Lv,Hongfei Yin,Qian Fei,Dongdong Xiao,Yongzheng Zhang,Woonming Lau
Surface and interface engineering of composite photocatalysts are effective ways to enhance the dynamics of photo-generated charge carriers. In this work, SrTiO 3 /Ti 3 C 2 MXene (STO/TC) Schottky heterojunction is constructed by in-situ growth of SrTiO 3 (STO) on Ti 3 C 2 MXene (TC) through Sr(OH) 2 etching the surfaces of TC. This in-situ growth strategy not only creates the tight chemically bonded interfaces by SrTiO 3 nanoparticles uniformly anchoring on the surface of two-dimensional Ti 3 C 2 MXene nanosheets for promoting the photo-generated charge carrier separation, but also introduces surface Ti vacancies as the efficient catalytic active sites to accelerate the charge carrier transfer process for efficient hydrogen production. The photocatalytic system constructed by interface and surface engineering optimizes the photo-generated charge carrier dynamics and refines the photocatalytic hydrogen evolution performance (6.8 times higher than pristine SrTiO 3 ) and stability. This work is expected to provide an alternative strategy to construct highly efficient photocatalysts with hydrogen evolution.
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