JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Mingjie Wang,Yi Liu,Gui Yang,Tiantian Xiang,Youxin Ji,Fengmei Su,Chuntai Liu
In order to maintain the human body temperature within a comfortable range in harsh environments, flexible and wearable thermal management fabrics that can combine energy storage and multi-modal heat recharging ability are urgently needed. Here, a strategy of coaxial electrospinning and spray coating was proposed to prepare the MXene-coated core-sheath phase change fibers to satisfy the above requirement. The hierarchical structure endows the composite film with phase change energy storage and photo/electro-thermal multi-modal heat charging performance. Specifically, the encapsulated paraffin wax (PW) in flexible polyurethane (PU) fibers has a high enthalpy value of 91.7 J/g, meanwhile, the flexible film exhibits excellent photo-thermal performance conversion capability (up to 40 °C under the irradiation intensity of 30 mW/cm 2 ) and electro-thermal conversion capability (up to 40 °C at the voltage of 1.5 V) at extremely low MXene loading (0.23 mg cm −2 ), which endows the MXene/PU@PW (MPP) ability of “heat recharging” by low light power density or low voltage. The multifunctional fabrics with phase change function and multi-modal heat recharging capacity exhibit great potential application in the design of wearable personal thermal management.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Zhen-Yu Wang,Lei Xu,Cai-Hua Liu,Sheng-Jie Han,Ming-Lai Fu,Baoling Yuan
Solar-driven interfacial water evaporation technology (SIET) is an emerging method for achieving sustainable production of clean water. Most available studies have focused on improving the evaporation efficiency of water, while less attention has been paid to the enrichment of evaporated organic contaminants, especially volatile organic compounds (VOCs) in distilled water, which is one of the key challenges in SIET. Herein, Ti3C2 MXene/CdS (MC) nanomaterials were synthesized by acid etching and hydrothermal methods, and MC composite hydrogels (MCHs) with synergistic effects of photothermal evaporation and photocatalysis were successfully prepared by crosslinking foaming polymerization. The water evaporation rate of optimal MCHs was 1.80 kg m−2 h−1 and the photothermal conversion efficiency of 82.80% could be achieved under one sun irradiation. Most importantly, MCHs significantly degraded a variety of organic contaminants in wastewater, among which the photodegradation rate of a typical VOC (phenol) was 85.12%, and the antibiotic metronidazole was completely removed. This research inferred that the MC hydrogels could be the promising synergistic photothermal evaporation and photocatalytic materials, providing a potential pathway for sustainable clean water production in the SIET field.
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POLYMER COMPOSITES
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2025
·
IF 4.7
Shuoli Peng,Liyun Guo,Feiyang Geng,Yudong Liu,Jinhui Liu,Jing Hua
L-cysteine, a bio-based modifier with multiple functional groups (thiol, amino, and carboxyl), holds promise for polymer modification. However, its tendency to agglomerate and poor solubility in nonpolar polymers limits its effectiveness. In this study, 1,2-polybutadiene (1,2-PB) was intercalated within MXene layers to enhance L-cysteine dispersibility. The intercalation allowed nanoscale distribution of 1,2-PB within MXene sheets, while interactions between MXene's hydroxyl groups and L-cysteine's polar groups promoted uniform dispersion in the rubber matrix. Compared with physical blending, the grafting degree of L-cysteine is higher, thereby more effectively restricting the movement of molecular chains, which leads to an increase in the effective damping temperature by over 7°C. Additionally, due to the ionic interactions between the functional groups, the resulting composite exhibits favorable dielectric performance, with the dielectric constant increasing from 2.5 to 3.2. Experimental results demonstrate that the synergistic effect between MXene and L-cysteine improves both the damping and dielectric properties of the resulting composites. This study presents a novel approach using two-dimensional nanosheets and bio-based thiols for modifying polybutadiene, offering a potential path for high-performance functional materials. Highlights In-situ polymerization enhances MXene distribution in the matrix. Grafting degree of L-cysteine increases with MXene incorporation. Well-dispersed MXene reduces L-cysteine aggregation, enhancing mechanical strength. Effective damping temperature rises by over 7°C with MXene and L-cysteine. Dielectric constant of composites increases from 2.5 to 3.2.
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Small
·
2024
·
IF 13
Yu Chen,Mengyao Gao,Kun Chen,Huili Sun,Haonan Xing,Xiaoqing Liu,Weijie Liu,Haizhong Guo
As a kind of flexible electronic device, flexible pressure sensor has attracted wide attention in medical monitoring and human-machine interaction. With the continuous deepening of research, high-sensitivity sensor is developing from single function to multi-function. However, Current multifunctional sensors lack the ability to integrate joule heating, detect sliding friction, and self-healing. Herein, a MXene/polyurethane (PU) flexible pressure sensor with a self-healing property for joule heating and friction sliding is fabricated. The MXene/PU sensitive layer with special spinosum structure is prepared by a simple spraying method. After face-to-face assembly of the sensitive layers, the MXene/PU flexible pressure sensor is obtained and showed excellent sensitivity (150.65 kPa −1 ), fast response/recovery speed (75.5/63.9 ms), and good stability (10 000 cycles). Based on the self-healing property of PU, the sensor also has the ability to heal after mechanical damage. In addition, the sensor realizes the joule heating function under low voltage, and has the real-time monitoring ability of sliding objects. Combined with low cost and simple manufacturing method, the multi-functional MXene/PU flexible sensor shows a wide range of application potential in human activity monitoring, thermal management, and slip recognition.
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Bio-Design and Manufacturing
·
2024
·
IF 8.1
Wang Gaofeng,Meng Lingxian,Ji Xinyi,Liu Xuying,Liang Jiajie,Liu Shuiren
As the main component of wearable electronic equipment, flexible pressure sensors have attracted wide attention due to their excellent sensitivity and their promise with respect to applications in health monitoring, electronic skin, and human–computer interactions. However, it remains a significant challenge to achieve epidermal sensing over a wide sensing range, with short response/recovery time and featuring seamless conformability to the skin simultaneously. This is critical since the capture of minute electrophysiological signals is important for health care applications. In this paper, we report the preparation of a nacre-like MXene/sodium carboxymethyl cellulose (CMC) nanocomposite film with a “brick-and-mortar” interior structure using a vacuum-induced self-assembly strategy. The synergistic behavior of the MXene “brick” and flexible CMC “mortar” contributes to attenuating interlamellar self-stacking and creates numerous variable conductive pathways on the sensing film. This resulted in a high sensitivity over a broad pressure range (i.e., 0.03–22.37 kPa: 162.13 kPa −1 ; 22.37–135.71 kPa: 127.88 kPa −1 ; 135.71–286.49 kPa: 100.58 kPa −1 ). This sensor also has a low detection limit (0.85 Pa), short response/recovery time (8.58 ms/34.34 ms), and good stability (2000 cycles). Furthermore, we deployed pressure sensors to distinguish among tiny particles, various physiological signals of the human body, space arrays, robot motion monitoring, and other related applications to demonstrate their feasibility for a variety of health and motion monitoring use cases. Graphic abstract
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Journal of Materials Chemistry C
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2024
·
IF 5.7
Yanzhi Cai,Zixuan Yu,Laifei Cheng,Yibing Yuan,Shaoxiong Ren,Yalong Chai,Mingxing Chen,Xue Huang,Yanjun Li
Developing pressure sensors that combine high sensitivity, a wide response range, and a stable signal output is a great challenge. Due to the insufficiently robust structure of the sensor's skeleton, the sensor's skeleton will not only cause irreversible damage under repetitive pressure but will also produce uncontrollable deformation in the contact area between the skeletons, thus affecting the sensor's detection range, sensitivity, and the stability of the signal output. In this study, carboxymethyl cellulose/sodium alginate/MXene/carbon nanotube (CMC/SA/MXene/CNT) aerogels are prepared by directional freezing–freeze drying. The aerogel has a three-dimensional isotropic porous structure with two-dimensional faces as the supporting skeleton in the X, Y, and Z dimensions. Moreover, conductive CNTs and MXene are embedded in the skeleton to form a leaf-vein structure, which enhances the strength and toughness of the skeleton. The aerogel has a light weight, high conductivity, excellent mechanical properties (compressive strength of up to 148.78 kPa at 80% strain), and exceptional compression resilience. Assembling it into a piezoresistive sensor, it is characterized by its high sensitivity (GF = 7.6, S = 894.8 kPa−1), excellent fatigue resistance (retaining stability after at least 10 000 uninterrupted cycles), and rapid response time (0.16 s). The sensor is used for real-time monitoring of human movement and physiological activities and as a signal transmission device, indicating its broad application prospects in the field of flexible smart wearables and signal transmission devices.
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ACS Applied Polymer Materials
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2024
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IF 4.4
Qingping Xin,Tao Huang,Shuo Li,Ningning Gao,Huimin Jin,Hao Chen,Lei Zhang,Hui Ye,Hong Li,Yuzhong Zhang
The membrane separation approach has garnered considerable interest in the area of CO2 separation due to its advantages of requiring little electricity and a wide range of applications. Here, we report the preparation of pSBMA@Ti3C2Tx nanosheets functionalized with poly(amphiphilic poly(methacryloyloxyethylsulfobetaine) (pSBMA)) by precipitation distillation, weighing of pSBMA@Ti3C2Tx nanosheets with different mass ratios to be added into cross-linked poly(ethylene oxide) (XLPEO), and preparation of a continuous, thin mixed-matrix membrane (MMM). Under gas humidification, the membrane showed the best permeation performance. Due to the richness of hydrophilic organosulfate groups (−SO3–) and quaternary amine groups [−N+(CH3)3] in pSBMA, the overall water content of the MMMs is increased, which greatly improves the CO2 permeability. Enhancing the ratio of bound water augments the membrane’s capacity to segregate CO2/N2. Under coordination of water molecules, quaternary amine groups effectively promote the quick delivery of CO2 in the membrane. In the wet state, the XLPEO/pSBMA@Ti3C2Tx-0.2 membrane has a CO2/N2 selectivity of 27.5 and a CO2 permeability of 4953 barrer, an improvement of 87% and 109%, respectively, compared to those of the XLPEO pure membrane, breaking the 2008 Robeson upper limit and approaching the 2019 upper limit. We also studied the change of the gas separation performance of the membrane under different pressures.
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JOURNAL OF PHYSICAL CHEMISTRY B
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2025
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IF 2.9
Yang He,Guowei Chen,Yiping Zhao,Li Chen
The hydrophilicity of two-dimensional (2D) transition-metal carbides, carbonitrides, and nitrides (MXene) nanochannels plays a critical role in water transport during filtration, yet its specific effects on MXene membranes remain inadequately understood. Herein, we systematically investigated water transport through Ti3C2TX MXene nanochannels using molecular dynamics simulations coupled with experimental validation, addressing a significant knowledge gap in MXene-based separation membranes. Our simulations demonstrated that strong interactions between water molecules and hydrophilic nanochannel MXene surfaces (Ti3C2(OH)2 MXene or Ti3C2(NH)2 MXene) facilitated the formation of ordered molecular arrangements, substantially improving water permeability. Conversely, hydrophobic nanochannels (Ti3C2O2 MXene or Ti3C2F2 MXene) exhibited disordered water molecule distributions, leading to reduced permeability. Experimental validation corroborated these simulation results, demonstrating a direct correlation between the hydrophilicity of the Ti3C2TX surface and the water flux. The highly hydrophilic Ti3C2(OH)2 MXenes exhibited water flux maximum, whereas the more hydrophobic Ti3C2F2 MXenes had the lowest water flux. By integrating molecular dynamics simulations with experimental analyses, we gained comprehensive insights into the influence of nanochannel hydrophilicity on water transport mechanisms in MXene membranes. These findings provide critical guidelines for designing high-performance MXene-based membranes for advanced water treatment and separation applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xinghao Qu,Boyu Li,Yilong Wang,Xiyang Li,Yuping Duan,Xuefeng Zhang,Guimei Shi,Yuanliang Zhou,Xinglong Dong
Electromagnetic pollution is escalating in the advent of the 5 G and forthcoming 6 G era. Ti 3 C 2 T X MXene, an emergent two-dimensional material, has been extensively applied in the field of electromagnetic absorption and shielding owing to its high electrical conductivity, adjustable interlayer spacing, and substantial surface area. However, its practical application as an absorber is severely limited by challenges including face-to-face restacking, surface modification difficulties, and poor impedance matching. Here, carbon-coated NiFe alloy nanoparticles (NiFe@C NPs), fabricated using the DC arc-discharge technique, are electrostatically self-assembled with MXene. This process effectively reduces self-stacking and enhances impedance matching properties. The robust magnetic coupling within NiFe alloy compensates for the deficiency in the magnetic loss capacity of carbon and MXene, while defects in the carbon layer and terminal groups on MXene's surface facilitate dipolar polarization. Furthermore, the heterogeneous interfaces between NiFe@C NPs and MXene produce localized dielectric polarization fields that are conducive to enhancing interfacial polarization. Additionally, the multilayered structure of MXene promotes multiple reflections and scattering of incident electromagnetic waves. When the NiFe@C/MXene composite has a thickness of 2.3 mm, it reaches a minimum reflection loss of −38.40 dB. Computer Simulation Technology (CST) results confirm the high radar cross section reduction value (17.21 dB·m 2 ), indicating the potential of multi-component NiFe/carbon/MXene composite for microwave absorption.
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Small
·
2024
·Vol. 20
·期 31
·2310191
·
IF 13
Zuoxiang Xie,Lei Yao,Houzhi Fang,Zhi Yang,Xuemei Zhou,Lin Lin,Junwen Xie,Yinhang Zhang
Wearable heaters with multifunctional performances are urgently required for the future personal health management. However, it is still challengeable to fabricate multifunctional wearable heaters simultaneously with flexibility, air-permeability, Joule heating performance, electromagnetic shielding property, and anti-bacterial ability. Herein, silver nanoparticles (AgNPs)@MXene heterostructure-decorated graphite felts are fabricated by introducing MXene nanosheets onto the graphite felts via a simple dip-coating method and followed by a facile in situ growth approach to grow AgNPs on MXene layers. The obtained AgNPs@MXene heterostructure decorated graphite felts not only maintain the intrinsic flexibility, air-permeability and comfort characteristics of the matrixes, but also present excellent Joule heating performance including wide temperature range (30–128 °C), safe operating conditions (0.9–2.7 V), and rapid thermal response (reaching 128 °C within 100 s at 2.7 V). Besides, the multifunctional graphite felts exhibit excellent electromagnetic shielding effectiveness (53 dB) and outstanding anti-bacterial performances (>95% anti-bacterial rate toward Bacillus subtilis, Escherichia coli and Staphy-lococcus aureus ). This work sheds light on a novel avenue to fabricate multifunctional wearable heaters for personal healthcare and personal thermal management.
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ACS Applied Electronic Materials
·
2024
·
IF 4.3
Dawei Gu,Guanglun Luo,Guangshan Zhou,Yimin Zhou,Yuanyuan Lou,Yi Liang,Yongwu Peng,Pengfei Shen,Baisong Pan,Guinan Chen,Bangchun Wen
Piezoresistive sensors hold promising prospects in various fields such as health monitoring, human–computer interaction, and robot sensing. To meet diverse application requirements, the development of multifunctional piezoresistive sensors possessing high sensitivity, mechanical robustness, and thermal insulation properties is imperative. In this study, we report the fabrication of a high-performance MXene-based aerogel, denoted as MXene/CNC/WPU, via unidirectional freeze-casting of cellulose nanocrystals, waterborne polyurethane, and Ti3C2Tx MXene, facilitated by hydrogen bonding. The resulting three-dimensional interconnected layered microstructure imparts the MXene/CNC/WPU aerogel-based piezoresistive sensor with remarkable features including high piezoresistive linear sensitivity (224.42 kPa–1), exceptional mechanical stability (up to 500 compressing cycles), and rapid response time (0.15 s), along with the ability to withstand compression strains of up to 80% (corresponding to 42 kPa). Furthermore, the piezoresistive sensor demonstrates real-time detection capabilities for various human physiological signals such as swallowing, blowing, finger and wrist bending. Moreover, the MXene/CNC/WPU aerogel, with a thickness of 1.5 cm, exhibits outstanding thermal insulation performance, generating a temperature gradient of approximately 150 °C at 210 °C. These remarkable attributes underscore its potential applications in health monitoring and high-temperature protection.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 5
·1-10
·
IF 5.3
Yang Xiao,Li Chunguang,Xia Jianfei,Zhang Feifei,Wang Zonghua
A three-dimensional (3D) self-assembled AuNPs/Ti 3 C 2 MXene hydrogel (AuNPs/Ti 3 C 2 MXH) nanocomposite was prepared for the fabrication of a novel microRNA-122 electrochemical biosensor. The 3D hydrogel structure was gelated from two-dimensional MXene nanosheets with the assistance of graphite oxide and ethylenediamine. MXene hydrogels supported the in situ formation of Au nanoparticles (AuNPs) that predominantly exploring the (111) facet, and these AuNPs are utilized as carriers for hairpin DNA (hpDNA) probes, facilitating DNA hybridization. MXene acted as both a reductant and stabilizer, significantly improving the electrochemical signal. In addition, the conjugation of PAMAM dendrimer-encapsulated AuNPs and H-DNA worked as an ideal bridge to connect targets and efficient electrochemical tags, providing a high amplification efficiency for the sensing of microRNA-122. A linear relationship between the peak currents and the logarithm of the concentrations of microRNA-122 from 1.0 × 10 −2 to 1.0 × 10 2 fM (I = 1.642 + 0.312 lg c , R 2 = 0.9891), is obtained. The detection limit is 0.8 × 10 −2 fM (S/N = 3). The average recovery for human serum detection ranged from 97.32 to 101.4% (RSD < 5%). Graphical Abstract
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危险品化学品经营许可证（带存储）