Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 7
·2688-2694
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IF 6.4
Shengping Dai,Hongwei Hu,Yixin Zhang,Jiang Xu,Yan Zhong,Guanggui Cheng,Jianning Ding
The hydrophobic encapsulation method is one of the common methods to ensure the regular operation of electronics under water. However, the hydrogel underwater sensors prepared by hydrophobic encapsulation still suffer from weak interfacial bonding. Here, we developed a high toughness and low hysteresis, dual-physically cross-linked structure hydrogel that was hydrophobically regulated by an MXene. The introduction of an MXene into the hydrogel can not only enhance the conductivity as a conductive filler, but also improve the mechanical properties as a physical cross-linking point. At the same time, the hydrophobic fluorine groups of the MXene can regulate the hydrophobic properties and enhance the bonding strength with the hydrophobic layer. In this way, a hydrophobic encapsulation structure hydrogel–elastomer hybrid was constructed, which showed a maximum bonding strength of 34.19 ± 1 N m−1, and excellent anti-drying (7d, ≤5.5%), and anti-swelling (7d, ≤0.07) properties. Furthermore, the core–shell structure hybrid fiber sensor exhibited excellent conductivity, sensitivity, and long-term stability performance in harsh environments, such as underwater, acid (pH = 1), alkali (pH = 14), salt solution (1 M NaCl), and alcohol solution. It provides a reliable opportunity for underwater smart wearable sensors using hydrogels with high flexibility.
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MOLECULES
·
2023
·Vol. 28
·期 4
·1541
·
IF 4.6
Pascaline Sanga,Juanjuan Wang,Xin Li,Jia Chen,Hongdeng Qiu
Developing a simple and efficient method for removing organic micropollutants from aqueous systems is crucial. The present study describes the preparation and application, for the first time, of novel MXene-decorated bismuth ferrite nanocomposites (BiFeO3/MXene) for the removal of six sulfonamides including sulfadiazine (SDZ), sulfathiazole (STZ), sulfamerazine (SMZ), sulfamethazine (SMTZ), sulfamethoxazole (SMXZ) and sulfisoxazole (SXZ). The properties of BiFeO3/MXene are enhanced by the presence of BiFeO3nanoparticles, which provide a large surface area to facilitate the removal of sulfonamides. More importantly, BiFeO3/MXene composites demonstrated remarkable sulfonamide adsorption capabilities compared to pristine MXene, which is due to the synergistic effect between BiFeO3and MXene. The kinetics and isotherm models of sulfonamide adsorption on BiFeO3/MXene are consistent with a pseudo-second-order kinetics and Langmuir model. BiFeO3/MXene had appreciable reusability after five adsorption–desorption cycles. Furthermore, BiFeO3/MXene is stable and retains its original properties upon desorption. The present work provides an effective method for eliminating sulfonamides from water by exploiting the excellent texture properties of BiFeO3/MXene.Keywords:MXene;bismuth ferrite;nanocomposite;sulfonamide;adsorption
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Na Kong,Ke Lv,Wenting Chen,Jie Guan,Pengfei Zhao,Jinlong Tao,Jizhen Zhang
MXenes, two-dimensional (2D) transition-metal carbides and nitrides with high electrical conductivity, show outstanding potential for energy storage applications. However, the aggregation and restacking of 2D MXene nanosheets seriously decrease the performance of MXene-based electrodes. Instead of using high-cost artificial templates, herein, we select natural rubber (NR) latex-containing uniform sub-macroparticles as sacrificial templates and successfully construct three-dimensional interconnected porous MXene foam. This porous structure effectively prevents the restacking of MXene nanosheets and accelerates the transfer of electrolyte ions during charging and discharging, which significantly enhances capacitance and rate performance. By adjusting the loading of latex, we find that MXene foam (MXF)-70% provides both improved specific capacitance of 480 F g–1 at 2 mV s–1 and superior rate performance (42.1% residual at 1 V s–1) with excellent cycling stability of 97.1% capacitance retention after 10000 cycles at 50 mV s–1. Additionally, the low cost of natural rubber latex provides an alternate route to produce foam electrodes on a large scale for portable and integrated supercapacitors.
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Advanced Materials Technologies
·
2023
·Vol. 8
·期 9
·2201767
·
IF 6.8
Yan Bai,Yuyuan Lu,Shuaihang Bi,Weikang Wang,Feifei Lin,Fu Zhu,Pin Yang,Ning Ding,Shujuan Liu,Weiwei Zhao,Ning Liu,Qiang Zhao
Wearable human-machine interaction (HMI) is an advanced technology that realizes operations, collaborations, and interactions between human and machines in a co-located or coordinated way. As the core component of wearable HMI electronics, the flexible sensor is desirable to be intelligent, accurate, collaborative, and multifunctional for the feedback control. Here, the multifunctional MXene/polyacrylic acid (PAA) hydrogel is prepared by radical polymerization. As a flexible strain sensor, it exhibits high sensitivity (gauge factor ≈4.94), wide detection range (0–1081%) and stable signal output for 500 cycles. It can also monitor human movement and operate manipulator in real time, exhibiting great potential in wearable artificial intelligence and HMI. Furthermore, the MXene/PAA hydrogel shows photothermal conversion performance with controllable surface temperature regulation ability (RT ≈67 °C) under near-infrared radiation. This work sheds a new light to develop the collaborative and multifunction wearable HMI electronics through integrating the flexible sensor with personal thermal management system.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yining Ding,Lei Xu,Shengnan Chen,Youfu Zhu,Yuehua Sun,Liqiang Ding,Bingyu Yan,Seeram Ramakrishna,Jun Zhang,Yun-Ze Long
Skin cancer is usually treated by surgical excision in the clinic. However, the unavoidable residual cancer cells and possible wound infection lead to a high tumor recurrence rate and slow wound recovery. Existing photothermal film materials tend to have a higher heat distribution on the upper surface than on the lower surface. This leads to low temperature on the lower surface attached to the skin that cannot produce effective photothermal effects. Herein, we designed a micro-nano effect combining Ti 3 C 2 T x MXene and fibers, which produces a similar lens effect to regulate the heat generated on the upper surface transmitting to the lower surface of the fiber membrane. Due to its asymmetric and unidirectional thermal conductivity having been significantly promoted, the fiber membrane exhibits effective ablating residual cancer cells after surgical excision attached to the wound as a dressing, and thus effectively inhibits tumor growth. In addition, this thermal management fiber membrane also exhibits an excellent bactericidal effect, accelerating post-surgical wound healing without losing the property of preventing post-surgical tumor recurrence.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2023
·
IF 3.8
Zhong Linhan,Chen Ye,Wen Qing,Yang Yang
The focus of this study is to develop a high-performance anode material for microbial fuel cells (MFCs). PEDOT:PSS and nitrogen-modified MXene were combined to create a hydrogel composite material called PPNM, which was drop-cast onto carbon felt (CF) as the MFCs anode. The PPNM exhibited a higher peak power density of 4.78 W m −2 , an increase of 332% compared to the CF anode. It is worth noting that the PPNM Hydrogel maintains its rough and porous structure, providing favorable sites for bacterial colonization. The introduction of N-MXene has improved the electrochemical performance of the hydrogel, particularly impacting the mediated electron transfer process. Microbial community analysis revealed the presence of more electrochemically active species on the PPNM anode. These findings highlight the potential of PPNM hydrogel and pave the way for similar strategies in achieving high-performance anodes in MFCs.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Hongyan Yin,Fangfei Liu,Tursun Abdiryim,Jiaying Chen,Xiong Liu
With the growing demand for eco-friendly materials in wearable smart electronic devices, renewable, biocompatible, and low-cost hydrogels based on natural polymers have attracted much attention. Cellulose , as one of the renewable and degradable natural polymers, shows great potential in wearable smart electronic devices. Multifunctional conductive cellulose-based hydrogels are designed for flexible electronic devices by adding sodium carboxymethyl cellulose and MXene into polyacrylic acid networks. The multifunctional hydrogels possess excellent mechanical property (stress: 310 kPa; strain: 1127 %), toughness (206.67 KJ m −3 ), conductivity (1.09 ± 0.12 S m −1 ) and adhesion (82.19 ± 3.65 kPa). The multifunctional conductive hydrogels serve as strain sensors (Gauge Factor (GF) = 5.79, 0–700 % strain; GF = 14.0, 700–900 % strain; GF = 40.36, 900–1000 % strain; response time: 300 ms; recovery time: 200 ms) and temperature sensors (Temperature coefficient of resistance (TCR) = 2.5755 °C −1 at 35 °C- 60 °C). The sensor detects human activities with clear and steady signals. A distributed array of flexible sensors is created to measure the magnitude and distribution of pressure and a hydrogel-based flexible touch keyboard is also fabricated to recognize writing trajectories, pressures and speeds. Furthermore, a flexible hydrogel-based supercapacitor powers the LED and exhibits good cyclic stability over 15,000 charge-discharge cycles.
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Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 4
·2444-2455
·
IF 11.9
Zi-Fang Chen,Xingguang Chen,Chengwei Chen,Xiaoxu Lai,Jian Qin,Chi Chen,Dan Sun
Stretchable current collectors are essential components of deformable energy-storage devices. Deposition of a conductive layer on an elastomer surface is a common fabrication strategy for stretchable current collectors, however, facing the challenges of reducing the tensile resistance and film thickness. In this study, by integrating Ti3C2Tx nanosheets with MWCNTs, the authors deposited a staggered conductive network on the surface of an elastic styrene–ethylene–butylene–styrene (SEBS) film and thus created a stretchable hybrid conductor (TMS). The TMS current collector exhibits a low sheet resistance of about 31.3 Ω □−1 and shows relatively minor changes under stretching states. The current collector with a thickness of 144 μm possesses a strain ability of 100% and can recover to the original state when the stress is withdrawn. Besides, the TMS-based coin cell using V2O5 and LiMn2O4 as active materials achieves a reversible capacity of 85.5 mA h g−1 and delivers a high capacity retention of 95.4% (5C, 900 cycles), comparable to performance with the traditional rigid Ti current collectors (97.1%). Furthermore, the assembled coplanar batteries with a thickness of 366 μm can work under bending and stretching states with stable electrochemical performance. Moreover, the power supply tests under various working states demonstrated the ability of the stretchable LIBs to deliver stable power to a red LED, which shows a promising approach for developing thin and deformable energy-storage systems.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Qiang Xue,Wenqiao Meng,Jinyuan Zhu,Qing Fang,Kaisong Zhang
Constructing nanomaterials interlayer for high-performance polyamide membranes is a popular technique in brackish water desalination, while selecting a suitable nanomaterial and convenient method for constructing interlayer remains a challenge. Herein, easily-modified MXene nanosheets were carboxylated to obtain excellent hydrophilicity, negative charge, and good compatibility with polymer, which were applied to construct carboxylated MXene (COOH-MXene) interlayered polyamide membranes by facile brushing process. COOH-MXene nanosheets have good compatibility with polyamide and supporting membranes, and make the membrane surface wrinkled, hydrophilic and negatively charged. The optimized membrane achieves a water flux of 12.9 Lm −2 h −1 bar −1 , 2.9 times of the blank membrane. The MgSO 4 rejection is improved to 99.1%, and the NaCl rejection is only 11.4%, displaying excellent selectivity for monovalent and divalent ions. Moreover, the prepared membranes have good antifouling properties and long-lasting desalination performance. This study presents a new approach to brackish water desalination by constructing COOH-MXene interlayered membranes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Rong Xue,Chou-Xuan Wang,Zhong-Guo Zhao,Yan-Hui Chen,Jie Yang,Chang-Ping Feng
The demand for flexible strain sensors with high sensitivity and durability has increased significantly. However, traditional sensors are limited in terms of their detection ranges and fabrications. In this work, a space stacking method was proposed to fabricate natural rubber (NR)/ Ti 3 C 2 T x (MXene)/silica (SiO 2 ) films that possessed exceptional electrical conductivity, sensitivity and reliability. The introduction of SiO 2 into the NR/MXene composite enabled the construction of an “island-chain structure”, which promoted the formation of conductive pathways and significantly improved the conductivity of the composite. Specifically, the electrical conductivity of the NR/MXene/10 wt%SiO 2 composite was enhanced by about 200 times compared to that of the NR/MXene composite alone (from 0.07 to 13.4 S/m). Additionally, the “island-chain structure” further enhanced the sensing properties of the NR/MXene/10 wt%SiO 2 composite, as evidenced by its excellent sensitivity (GF = 189.2), rapid response time (102 ms), and good repeatability over 10,000 cycles. The fabricated device demonstrates an outstanding mechanical sensing performance and can accurately detect human physiological signals. Specifically, the device serves as a strain detector, recognizing different strain signals by monitoring the movement of fingers, arms, and thighs. This study provides critical insights into composite manufacturing with exceptional conductivity, flexibility and stability, which are essential properties for creating high-performance flexible sensors.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Jun Zhu,Songrui Wei,Jie Tang,Yi Hu,Xiaoyu Dai,You Zi,Mengke Wang,Yuanjiang Xiang,Weichun Huang
Recently, novel two-dimensional materials, e.g., Xenes (graphdiyne, phosphorene, bismuthene, antimonene, etc.) and MXenes, have drawn great attention in nanophotonics due to their excellent flexibility, high photothermal conversion efficiency, and large thermal conductivity. Although the Xenes and MXenes have achieved rapid progress in many fields over the past decade, their relatively poor photodetection and nonlinear photonics have still limited their practical applications. In this work, a mixed-dimensional 2D MXene V2CTx nanosheet (NS)/0D bismuth quantum dot (Bi QD)-based heterostructure fabricated by a combination of selective etching and the hydrothermal method was simply deposited onto a clean poly(ethylene terephthalate) substrate with an embedded regular Ag lattice to prepare a flexible photoelectrochemical (PEC) electrode. The PEC result shows that the as-fabricated flexible electrode not only exhibits significantly improved photocurrent density (32.7 μA cm–2) and photoresponsivity (906 μA W–1) compared to individual MXene V2CTx NSs and Bi QDs but also displays high stability with a stable photocurrent density even after 200 bending cycles at 60°. Taking advantage of the Kerr effect of both MXene V2CTx NSs and Bi QDs, an all-optical switcher based on this mix-dimensional heterostructure for the spatial cross-phase modulation has also been realized with a preferred modulation depth. Density functional theory calculations provide direct evidence for the strong internal built-in electric field (7.3 × 107 eV m–1) created by the heterostructure for the enhancement of both photodetection and nonlinear photonics. The integration of Xenes or MXene-based mixed-dimensional heterostructures provides a concept and fundamental guidance to construct next-generation optoelectronic and photonic devices.
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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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