CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hongjian Zhang,Yi Fang,Wen Chen,Yong Zhang
Demanded by the increasing popularity of human–machine interface, wearable electronics, robots, etc., the current mainstream pressure sensing technologies could not fully fulfill the accurate and in-time sensing requirement. Ionic-based pressure sensors, which are inspired by the working mechanism of human haptic system, present several outstanding advantages and great potential. However, how to effectively control the ion transport and compensation under mechanical deformation in ionic-devices serves as a critical challenge in this new and under-developed field. In this study, we designed and constructed an ion-selective membrane based on 2D MXene to modulating the directional cations immigration in PVA hydrogels, which is the first demonstration in this field. To be specifically, the cations are trapped by the cation-selective MXene membrane due to the negative charge surface of MXene, which creating the ion concentration gradient within the PVA hydrogels and in turn the maximum power output up to 3.81 μW/cm 2 . On this basis, we prepare a concentration difference cell by placing the MXene film between two PVA hydrogels with different ionic concentration. Furthermore, the MXene film was placed between two PVA hydrogels with different moduli and the ion transport could be induced by the stress-induced inhomogeneous deformation, resulting in the formation of ionic concentration differential. Above two models were packed as the arrays to create an ionic touchpad, which is capable of detecting and differentiating various external stimuli accurately. This work explores two kinds of transport models by designing the layer arrangement of PVA hydrogels and MXene membrane, which provides a simple and versatile strategy for developing ionic-based self-powered pressure sensors.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Jizhe Zhang,Juan Xu,Yuan Gao,Feng Qin,Xingzhong Zhu,Caixia Kan
In various fields, the innovation of optoelectronic devices crucially depends on flexible, transparent materials that shield against electromagnetic interference. Herein, the fabrication of flexible transparent electromagnetic interference shielding effectiveness (EMI SE) composite films on PET substrates is achieved using silver nanowires (Ag NWs) and two-dimensional nanosheets (Ti3C2Tx). The uniform Ag NWs with high aspect ratio as a basic conductive network are synthesized using a modified polyol method, which is further optimized through combining with two-dimensional multilayer MXene nanosheets. The Ag NW/MXene composite films acquire a sandwich structure after sequential layering of Ag NW/MXene, finalized by spin-coated PMMA layer. It is worth noting that the addition of MXene nanosheet can decrease surface roughness and increase conductivity via filling the gap of Ag NW network. The Ag NW4/MXene4 composite films with excellent photoelectric performance are suitable for the commercial applications considering the production costs. Furthermore, the fabricated Ag NW/MXene/PMMA composite films demonstrate exceptional flexibility, maintaining integrity after 10 000 continuous bending cycles, and exhibit remarkable stability under harsh conditions, specifically in environments of 80 °C and 80% relative humidity (RH) for duration of 30 days. By finely tuning the concentrations of Ag NW and MXene nanosheets, these composite films attain significant EMI SE level of 35 dB in the X-band. In the EMI shielding mechanism, the absorption component of the shielding effectiveness (SE) is shown to play an important role. The integration of MXene into the composite film markedly improves its EMI shielding effectiveness by boosting the conductivity of the Ag NW network. Furthermore, the multireflection originating from the inner MXene nanosheet is another pathway to promote the EMI shielding performance, which is always neglected for the thin films. Taken together, the introduction and understanding of MXene into Ag NW transparent films provide inspiration for the development of advanced EMI shielding materials for wide applications.
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Journal of Energy Storage
·
2024
·
IF 8.9
Wenyu Bai,Guangpeng Ma,Xinpu Zhou,Tongtong Gao,Yu Luo,Di Yu,Shuang Wang
Traditional two-dimensional transition metal carbides/nitrides (MXene) have gained much academic concern due to their excellent physicochemical properties, but their susceptibility to self-stacking leads to poor cyclic stability. In this paper, an MXene-based electrode active material was successfully prepared. The generated modified PPy (g-PPy) increases the active site, increases the accessibility of ions, and can give full play to the pseudocapacitance. By the combination of modified PPy (g-PPy) nanoparticles with pseudocapacitive behavior polymerized in situ on sulfonated cellulose (SC) and MXene , not only the electrochemical performance was improved by exploiting the synergy between different electrode materials and different energy storage mechanisms, but also the MXene as a skeleton limited the volume expansion and contraction of PPy during charge/discharge cycles and the g-PPy and SC composites (g-PPy@SC) as a spacer supported the MXene layer, resulting in much higher cycle stability. Cycle stability of 98.4 % even after 10,000 cycle tests. In addition, a symmetric supercapacitor assembled from this electrode material maintains a stability of 84.4 % under 10,000 cycles at a low temperature of −40 °C. Therefore, this study provides a feasible method for the preparation of MXene-based electrodes with high cycling stability.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Changzhou Du,Hongjian Zhang,Xiaofei Liu,Shengyang Zhou,Yanan Ma,Shuxuan Li,Yong Zhang
Flexible pressure sensors are intensively demanded in various fields such as electronic skin, medical and health detection, wearable electronics, etc. MXene is considered an excellent sensing material due to its benign metal conductivity and adjustable interlayer distance. Exhibiting both high sensitivity and long-term stability is currently an urgent pursuit in MXene-based flexible pressure sensors. In this work, high-strength methylcellulose was introduced into the MXene film to increase the interlayer distance of 2D nanosheets and fundamentally overcome the self-stacking problem. Thus, concurrent improvement of the sensing capability and mechanical strength was obtained. By appropriately modulating the ratio of methylcellulose and MXene, the obtained pressure sensor presents a high sensitivity of 19.41 kPa–1 (0.88–24.09 kPa), good stability (10000 cycles), and complete biodegradation in H2O2 solution within 2 days. Besides, the sensor is capable of detecting a wide range of human activities (pulse, gesture, joint movement, etc.) and can precisely recognize spatial pressure distribution, which serves as a good candidate for next-generation wearable electronic devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Gang Li,Ruiyang Tan,Bohong Gao,Yuting Zhou,Chengcheng Zhang,Ping Chen,Xinyi Wang
Electromagnetic wave absorption (EMWA) materials with qualities such as low cost, thin thickness, and high efficiency are of tremendous value in addressing the challenges posed by EMW pollution. Herein, we have successfully synthesized a nanoflower-like composite from the Prussian blue analog KCoFe(CN) 6 through a combination of hydrothermal and post-annealing methods. Subsequently, we prepared the hierarchical composite CoFe-K/GC@MnO 2 @MXene (CMM) by electrostatic self-assembly with few-layered Ti 3 C 2 T x nanosheets . Their chemical compositions, microstructures, and EMWA performances were thoroughly investigated. The CMM composite demonstrated outstanding EMWA performance with an impressive minimum reflection loss ( RL min ) value of −53.0 dB at 1.68 mm and an effective absorption bandwidth (EAB) value of 4.0 GHz with an ultrathin-matching thickness of only 1.55 mm. The exceptional EMWA performance of CMM can be attributed to the increased conductive loss, enhanced interfacial polarization, and optimized impedance matching. Simulated radar cross-section (RCS) plots confirm the outstanding RSC reduction achieved by the CMM absorber coating. Furthermore, the EAB can be extended to 12.12 GHz by designing a macro 3D quadrangular frustum pyramid structural model for the absorber. The practical application potential of CMM was also enhanced by its good heat dissipation capability, which was demonstrated in real-time using an infrared thermal imager. This work provides a novel insight into developing efficient and multifunctional EMWA materials for practical applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xue Zhu,Xin Qian,Mengyuan Hao,Yonggang Zhang,Zhenjiang Zhang,Shujun Li,Haonan Wu
Two-dimensional transition-metal carbides (MXene) has been considered as a promising choice for outstanding EMW absorption material, because of the single dielectric loss caused by its high dielectric constant and the various polarization modes attributed to the abundant surface groups. However, the impedance mismatch caused by high dielectric constant and the structural design difficulties resulted from lamellar self-stacking limit the application of MXene. In this study, large-size MXene precipitation and small-size MXene were separated by a differential centrifugal method. A novel flower-like MXene (MXene-F) self-assembled from small-size MXene was obtained by an ice template method. The chemical compositions of MXene and its formation mechanism were analyzed by XRD, XPS, Raman and FTIR. Results showed that nano-scaled MXene could self-assemble into a spherical structure under the action of intermolecular hydrogen bonds. The porous structure of MXene-F was conducive to its impedance matching, and its flower-like structure could enhance the multiple reflection and scattering. Therefore, MXene-F possessed excellent absorption performance with a minimum reflection loss of −66.9 dB at a thickness of only 1.47 mm and an effective absorption bandwidth of 4.08 GHz. This work provides a novel and effective approach for the preparation of MXene EMW absorbing materials with low thickness and high reflection loss.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haohang Song,Yusheng Ma,Qian Yao,Chao Liu,Xuesong Li,Xutang Tao
MXene has attracted broad attention for its unique physicochemical properties and has flourished in many research areas. Since MXene obtained by high crystalline-quality MAX phase has excellent stability and properties, the etching of high crystalline-quality MAX phase and delamination into monolayer will become an inevitable trend. However, the delamination of the high crystalline-quality MXene is significantly more challenging than conventional MXene because of the more vital van der Waals forces of the more regular interlayer structure. Here, we propose a freeze-sonication delamination (FSD) strategy that can solve the difficult problem of efficiently exfoliation of high crystalline-quality MXene. The principle is to utilize the synergistic effect of ultrasound and ionic intercalation to allow a large number of water molecules to penetrate into the interlayer, which results in volume expansion, and then ultrasound to obtain monolayer MXene in a frozen state. This method not only increases the yield of high crystalline-quality monolayer MXene but also prevents the size reduction and the nanosheet destruction. The yield of monolayer MXene reached 74.2 % with a concentration of 19.8 mg/mL after six FSD cycles (the time of ultrasound treatment is 5 min after per freeze). Meanwhile, under the protection of ice, the obtained monolayer MXene has a larger size with more complete nanosheets than ultrasound-delaminated MXene. Supercapacitors made of high crystalline-quality MXene exhibits excellent gravimetric capacitance of 261.1 F/g and satisfactory cycling stability.
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ACTA MATERIALIA
·
2024
·
IF 8.3
Chaowen Tan,Wansen Ma,Liwen Hu,Qian Li,Xuewei Lv,Jie Dang
As a new type of two-dimensional material, MXenes with increased entropy (ME/HE-MXenes) possess immense potential for exhibiting unforeseen properties, making them a compelling subject for further investigation. However, due to the difficulty in predicting and preparing stable medium-entropy MAX (ME-MAX), as precursors of ME-MXenes, only a few ME-MXenes have been synthesized successfully. Herein, we proposed a thermodynamic competition strategy that enabled the successful synthesis of a stable ME-MAX consisting of four-transition metals: Ti, V, Cr and Nb, which was first predicted by density functional theory calculation. The resulting ME-MAX with a hexagonal crystal structure and pseudo-structure of P 6 3 /mmc, possessed the chemical formula TiVCrNbAlC 3 . Subsequently, the corresponding ME-MXene was prepared by selectively etching the Al layer using HF acid, obtaining the desired composition of Ti 1.1 V 1.1 Cr 0.4 Nb 1.4 C 3 T x . Furthermore, aberration-corrected scanning transmission electron microscopy analysis revealed that the MX slabs within the prepared ME-MXene contained four transition metal layers arranged in an α -configuration, which was consistent with the atomic structure of the ME-MAX. In comparison to single transition metal MXenes, the tailored ME-MXene showcased lattice distortions attributable to the highly diverse composition space, consequently leading to increased active sites and improved electrical conductivity . As a result, the annealed Ti 1.1 V 1.1 Cr 0.4 Nb 1.4 C 3 T x has higher mass capacitances when used as the supercapacitor negative electrode, with weight capacitances of 292.74 F g −1 at 2 mV s −1 and 137.20 F g −1 at 200 mV s −1 . The strategy proposed in this study not only expands the realm of achievable ME-MAX compositions but also opens up new possibilities for derivative medium-entropy MXenes.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Ziye Wang,Guijuan Liu,Ting Yang,Yao Liang,Fangqi Zhou,Xiaohui Ju,Weixing Li
Mixed matrix membranes (MMMs) demonstrate significant potential for pervaporation applications. Nevertheless, single lamella 2D materials are prone to stacking problems in membranes, resulting in unforeseen matrix inhomogeneity and defects. Here, we propose a wafer-like membrane structure designed for ethanol dehydration. This structure features a surface modification of transition metal carbides (MXenes) with layered dihydroxides (LDHs), which effectively enlarges the interlayer spacing and ameliorates the stacking issue. The LDHs-modified MXenes were then incorporated into the sodium alginate (SA) layer. The hydrophilicity , stability and morphology of the MMM were evaluated by water contact angle measurements, swelling tests and scanning electron microscopy. The experiment results indicated the hydrophilicity and stability of the MMM were effectively improved. The novel L-M@CS MMM exhibited outstanding dehydration performance for ethanol solution, with the membrane containing 0.4 wt % LDHs-modified MXenes achieving the highest permeation flux of 1377 g/(m 2 ·h) and the optimal separation factor up to 1650.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 40
·19075-19087
·
IF 3.5
Tong Yifan,Liu Linxiang,Chen Zehong,Zhong Linxin
Hydrophobic, elastic, and conductive (HEC) aerogels have significant potential in electronic devices. Herein, we propose a new method to fabricate an HEC aerogel with excellent mechanical and sensing performances from TEMPO-oxidized bacterial cellulose (O-BC) and conductive MXene nanosheets via directional freeze-drying and silanization modification. O-BC with a high aspect ratio can interweave with each other to form continuous layers, while MXene can induce a regular and flat structure and provide good conductivity. The silanization modification ensures high hydrophobicity and high elasticity, which can prevent the aerogel from structural collapse by avoiding adhesion among lamellae. The resulting aerogel can withstand compressive strain high up to 90% and long-term compression for 10,000 cycles at 50% strain due to the elastic and hydrophobic lamellar structure. It also offers a precise electrical response to stress signals in a broad detection range of 0–40 kPa and can accurately detect biological signals from humans. These structural and mechanical performance benefits make the HEC aerogel valuable in the field of pressure sensing.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Mengxia Shen,Chanjuan Liang,Xinyu Xu,Jiale Qi,Jiaojiao Sun,Liguo Yang,Liangjiao Xie,Xiaojie Li
With the further advancement of communication technology and wearable devices, it is imperative to develop multifunctional electromagnetic shielding materials. In this context, we propose a feasible approach to construct liquid metal-enhanced poly(vinyl alcohol) (PVA)-aramid nanofiber (ANF)/MXene hydrogels for electromagnetic shielding and sensing. By leveraging the excellent conductivity of MXene nanosheets, we successfully prepared three-dimensional flexible PVA-ANF/MXene@Ga hydrogels (PAMG) through the three-dimensional network structure of PVA hydrogels and the mechanical reinforcement of ANFs. With the phenomenon of charge polarization relaxation, multiple interfaces are formed among MXene@Ga, ANFs, and PVA, thus enhancing the mechanical properties and electromagnetic shielding efficiency of the hydrogels. The PAMG hydrogels exhibit an electromagnetic shielding effectiveness of 35.7 dB and a higher water retention capability (with water retention exceeding 60% after 28 days). Furthermore, the hydrogels demonstrate outstanding sensing performance and exhibit high stability for a wide range of human motion detection signals. The research findings indicate that the MXene nanosheet-based electromagnetic shielding hydrogel holds great potential as an ideal platform for multifunctional electromagnetic shielding materials.
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Biomaterials Advances
·
2024
·
IF 5.5
Xingyu Zhou,Wendi Ma,Junhui Jiang,Junbo Dang,Ruifu Lv,Hongbo Wang,Minna Ma,Dahui Sun,Mei Zhang
On account of the existence of antibiotic resistance, the wound healing of pathogenic infection is still a challenge in modern society. A desirable wound dressing should own the abilities of adhesiveness, hemostasis and good mechanical property, meanwhile the property of eliminating bacteria without side effects is also highly needed. In this work, we established a kind of hydrogel based on carboxymethyl cellulose-graft-tyramine (CMC-Ty) and MXene (Ti 3 C 2 T x ) through employing H 2 O 2 /HRP (horseradish peroxidase) as the initiator, then the as-prepared hydrogel (named CMC-Ty/MXene) was immersed in tannic acid (TA) solution, and this TA-treated hydrogel was called CMC-Ty/MXene+TA. By employing TA as the multi-functional H-bond provider, the adhesiveness, hemostatic ability, mechanical property and bactericidal performance of the hydrogel was enhanced. And MXene in this system exerted benign photothermal antimicrobial performance, it was able to transform near-infrared (NIR) light into heat, then the bacteria would be physically damaged (thermal destruction) due to the hyperthermy, hence the antibacterial effect of which will not be restricted by antibiotic resistance. The temperature of the hydrogel in the experimental group can be increased by 25 °C after irradiation by 808 nm NIR light for 10 min, and the bactericidal efficiency against both E. coli and S. aureus reached >99 %. In vivo tests demonstrated that with the assistance of NIR irradiation, the hydrogel can distinctly accelerate the S. aureus infected wound closure. We envisage that this non-antibiotic dependent multifunctional photothermal hydrogel can provide a promise for bacteria-invaded wound healing.
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