Smart Materials and Structures
·
2023
·Vol. 32
·期 6
·065014
·
IF 4.1
Tianjie Hou,Shufen Wang,Jianmin Li,Yu Wang,Yang Zhang,Lei Cao,Shixian Xiong,Lanlan Fan,Feng Gu
Intelligent actuators offer a lot of potential for use in soft robots, artificial muscles, sensors since it can alter shape in response to external stimuli. However, the stiffness of the material and the constrained specific surface area brought on by the dense stacking of materials restrict the response of the conventional humidity-responsive actuators. Herein, optimal humidity-responsive actuators of MXene were developed by designing topologies of heterostructured membrane of stacked nanosheets and 3D wrinkled MXene (3D-MXene). In this configuration, the stacked MXene nanosheets sustain the device's overall strength, while the 3D-MXene layer significantly improves the device's moisture absorption and decreases its stiffness. Importantly, the actuators have been strengthened due to the van der Waals forces at the interface of the stacked nanosheets and 3D-MXene. The fabricated MXene/3D-MXene actuator has exhibited remarkable response speed and deformation ability, obviously superior to any previously reported humidity-responsive actuators. By combining excellent electrical conductivity, the developed actuators demonstrated rapid response for electrical switches. This work highlights the significant potential for developing high performance responsive actuators by designing heterostructured configurations for applications in intelligent switches, soft robotics and synthetic muscles.
研究领域:
材料科学
·
智能设备
·
软机器人技术
✓ 已验证
DOI
高影响因子
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.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 31
·14313-14327
·
IF 3.5
An Boyuan,Zhang Dongjie,Liu Yuyan,Fan Zhimin,Tan Huifeng,Xie Zhimin
Ti 3 C 2 T x (MXene)-based composites are considered electromagnetic wave absorption (EMA) materials due to their dielectric properties, microstructure, and synergistic interactions with magnetic particles. A better understanding of the effect of the MXene content in composites on the EMA performance is essential for their application, yet it remains unclear. Here, MXene/PU@Fe 3 O 4 (MPF) microspheres with different MXene contents were produced through the incorporation of magnetic particles and multiple electrostatic self-assembly processes. The results show that when the molar ratio of MXene to Fe 3 O 4 is less than 0.5:1, the EMA performance of the MPF microspheres gradually increases with increasing MXene content. MPF microspheres exhibit the best EMA performance when the molar ratio of MXene to Fe 3 O 4 is 0.5:1, with a maximum reflection loss (RL) of 44.0 dB and an effective absorption bandwidth (EAB) of 2.30 GHz. Further increases in this ratio led to an increase in the EAB but a slight reduction in the maximum RL. Additionally, the combination of the same MXene and Fe 3 O 4 nanoparticle ratio had no significant effect on the EMA performance. We expect that this work will enrich the EMA performance research on MXene-based composites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Ziyang Zhou,Sepideh Pourhashem,Zhengquan Wang,Jiawen Sun,Xiaohong Ji,Xiaofan Zhai,Jizhou Duan,Baorong Hou
In this research, the effects of fresh and oxidized MXene on the surface, adhesion, and corrosion-resistant properties of waterborne epoxy coatings are considered. The oxidized MXene is prepared through storage of fresh MXene nanosheets in an open vial for 1 month. The results confirm that the waterborne epoxy coating loaded with silane functionalized fresh MXene nanosheets (epoxy/F-MXene) has significantly higher barrier performance and anti-corrosion behavior than the sample modified with silane functionalized oxidized MXene nanosheets (epoxy/F-O-MXene). Indeed, the F-MXene nanosheets (with defect-free and large two dimensional morphology) are able to effectively inhibit the path of corrosive media as well as increment the epoxy matrix compactness compared to the F-O-MXene (with broken nanosheet morphology composed of TiO 2 nanoparticles) due to rapid oxidation of the MXene nanosheets in the environment. Besides, the epoxy/F-MXene nanocomposite coating has slightly higher water contact angle and adhesion strength to the metallic substrate compared to the epoxy/F-O-MXene. The results of this research clearly reveal the importance of preventing MXene oxidation before application as nanofiller in the polymer coatings.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jiana Hu,Caiyun Liang,Jiadong Li,Chuanwei Lin,Yongjiu Liang,Dewen Dong
2D transition metal carbide/nitride (MXene) nanomaterials have prospective applications in high-performance microwave absorption (MA). However, the excessively high permittivity, absence of magnetic loss, and susceptible oxidizability of MXene severely hinder the enhancement of its MA properties. Here, we used a facile organic solution–phase thermal decomposition method to prepare dielectric–magnetic MXene@CoNi nanocomposites with heterojunctions , which can effectively prevent the oxidation of MXene . Subsequently, the MXene@CoNi nanocomposites were integrated with magnetic CoNi alloys, MXene microspheres (MXene MPs), and a silicon rubber (SR) matrix to construct multilayered CoNi/MXene@CoNi/MXene MPs/SR composites by casting and curing. Benefiting from the multilayered structure and complementary effects of the dielectric and magnetic components, the multilayered CoNi/MXene@CoNi/MXene MPs/SR composites composed of matching, absorbing, and reflective layers showed a remarkable minimum reflection loss of −53.3 dB and an ultra-broad effective absorption bandwidth up to 11.12 GHz at a thickness of 2.96 mm. These results demonstrated the developed multilayered composites are promising candidates for high-performance MA. Our study provides new insights into the development of ultra-broadband MXene-based absorbent materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 5
·期 4
·963-972
·
IF 5.503
Sen-Wang Wang,Zhen-Hong He,Jian-Gang Chen,Kuan Wang,Zhong-Yu Wang,Pan-Pan Guo,Jie Lan,Weitao Wang,Zhao-Tie Liu
Hydrogenolysis of biomass-derived lignin sources is highly important for the conversion of renewable biomass resources to biofuels. However, lots of developed catalysts suffer from the drawbacks of expensive precious metal catalysts and/or operation under harsh conditions. In the present work, Co–Ni bimetallic catalysts were prepared and applied in catalyzing hydrogenolysis of Caryl–O aromatic ethers with high activities under the promotion of Nb2C MXene additive. Especially, the hydrogenolysis of diphenyl ether (DPE), a 4–O–5 model compound, to cyclohexane (cy) and cyclohexyl alcohol (cy-ol) could be achieved over the Co2Ni1Ox–Nb2C MXene catalytic system at 120 °C and under 5 bar of H2, which are mild conditions in comparison with those for the developed heterogeneous precious-metal-free catalysts. The excellent catalytic performances stemmed from the strong interaction between Co and Ni species and the promotion of Lewis acidic sites offered by Nb2C MXene. The proposed reaction pathway involved the direct hydrogenolysis of DPE route, in which DPE was initially hydrogenolyzed to benzene and phenol. They were further hydrogenated to cy and cy-ol. The present work not only develops a noble-metal-free bimetallic catalyst for utilization of biomass-derived lignin sources, but also provides a novel strategy for using the Nb2C MXene material.
研究领域:
催化化学
·
能源材料科学
·
生物质转化
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Lei Liang,Xianxian Sun,Yuanhao Ning,Shasha Wang,Weilong Yin,Yibin Li
The process of toughening brittle ceramics is challenging but important for broadening their range of applications. Extensive studies on toughening brittle alumina (Al 2 O 3 ) ceramics at room temperature have been conducted; however, significantly increasing their toughness at high temperatures remains a challenge. Here, we propose the use of two-dimensional Ti 3 C 2 T x MXene ceramics with high thermal stability to effectively toughen Al 2 O 3 ceramics at high temperatures via a nacre-like structure strategy. The fracture toughness (K Jc ) of the as-prepared MXene/Al 2 O 3 nanocomposite at 1000 °C is 6.02 MPa m 1/2 , 2.4 times that of pure Al 2 O 3 (2.51 MPa m 1/2 ). Moreover, it maintains relatively high strength at 1000 °C (∼193 MPa). The toughening mechanisms - crack deflection, bifurcation and bridging effects - are obtained via in situ observation of crack propagation and finite element simulation. Our novel strategy provides a universal solution to improve the toughness of brittle ceramics at high temperatures and in some special environments.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
Membranes
·
2021
·Vol. 12
·期 1
·2
·
IF 4.106
Qiang Xue,Kaisong Zhang
Nanomaterials embedded in nanofiltration membranes have become a promising modification technology to improve separation performance. As a novel representation of two-dimensional (2D) nanomaterials, MXene has nice features with a strong negative charge and excellent hydrophilicity. Our previous research showed that MXene nanosheets were added in the aqueous phase, which enhanced the permeselectivity of the membrane and achieved persistent desalination performance. Embedding the nanomaterials into the polyamide layer through the organic phase can locate the nanomaterials on the upper surface of the polyamide layer, and also prevent the water layer around the hydrophilic nanomaterials from hindering the interfacial polymerization reaction. We supposed that if MXene nanosheets were added in the organic phase, MXene nanosheets would have more negative contact sites on the membrane surface and the crosslinking degree would increase. In this study, MXene were dispersed in the organic phase with the help of ultrasound, then MXene nanocomposite nanofiltration membranes were achieved. The prepared MXene membranes obtained enhanced negative charge and lower effective pore size. In the 28-day persistent desalination test, the Na2SO4rejection of MXene membrane could reach 98.6%, which showed higher rejection compared with MXene embedded in aqueous phase. The results of a long-time water immersion test showed that MXene membrane could still maintain a high salt rejection after being soaked in water for up to 105 days, which indicated MXene on the membrane surface was stable. Besides MXene membrane showed high rejection for high-concentration brine and good mono/divalent salt separation performance in mono/divalent mixed salt solutions. As a part of the study of MXene in nanofiltration membranes, we hoped this research could provide a theoretical guidance for future research in screening different addition methods and different properties.Keywords:MXene;nanofiltration;anti-swelling;mono/divalent ion separation;high saline removal
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2024
·
IF 10.5
Xiaotong Sun,Ze Wu,Xiuli Tan,Youqiang Xing,Peng Huang,Bingjue Li,Lei Liu
Research on developing highly efficient microwave absorption (MA) absorbers is crucial for addressing electromagnetic (EM) pollution and advancing stealth technology. MXene, a new class of MA materials, have been widely studied . Nevertheless, MXene often faces challenges such as high self-stacking and excessive electrical conductivity, which lead to poor impedance matching. To overcome these problems, the unique manufacturing produces an overall homogeneous and locally aggregated MXene in the form of island chains, enhancing electrical conductivity and polarization loss while alleviating the self-stacking problem of MXene nanosheets. Further improvement is achieved by modifying the N–CNF@MXene aerogel with MoS 2 through atomic layer deposition (ALD). This modification resulted in a layered core-sheath structure featuring the N–CNF@MXene@MoS 2 aerogel (NCMMA) absorber. Importantly, this process preserved the intrinsic structure of the material while significantly enhancing its MA performance. NCMMA has a minimum reflection loss RL min of −78.32 dB (3.49 mm) with a fill factor of only 3.97 %. The effective absorption bandwidth (EAB) is 7.58 GHz (2.5 mm), covering the Ku band. The unique joint process design of hierarchical core-sheath in situ heterogeneous interfaces combined with the complex interpenetrating conductive network structure employed in this work is a strong candidate for MA materials for next-generation lightweight stealth coatings.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 5
·1968-1988
·
IF 3.5
Li Xiangyu,Ma Zhenfang,Wang Lili,Li Shuokang,Duan Yinhe,Wu Minghua
The composite films with flexible and high electromagnetic-shielding (EMI) performance have been attracting more and more attention. Herein, using MXene as an interlayer and carbon nanotube/sodium alginate (CNT/SA) as a core layer, a flexible and high EMI MXene@CNT/SA@MXene (MCS) film with a sandwich structure was successfully prepared via alternating vacuum filtration. The optimal MCS film was obtained with a MXene dosage of 15 mg, a CNT/SA dosage of 6 mg and a CNT:SA mass ratio of 6:4. The thickness of the MCS film had a linear relation with the MXene and CNT/SA dosages. The best MCS film was 12 μm thick and exhibited an EMI total electromagnetic wave efficiency ( SE T ) of 61.3 dB, SSE / t of 2.34 × 10 5 dB cm 2 g −1 and conductivity of 1.74 × 10 5 S m −1 . The breaking strength, breaking elongation and toughness of MCS film increased by 24.3%, 16.7%, and 40.0% in comparison with pure MXene film, and by 40.3%, 40.0%, and 100% in comparison with MXene/CNT/SA blend film, respectively.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 45
·1802479
·
IF 9.598
Ji Liu,Hao-Bin Zhang,Xi Xie,Rui Yang,Zhangshuo Liu,Yafeng Liu,Zhong-Zhen Yu
2D transition metal carbides and nitrides (MXenes) have gained extensive attention recently due to their versatile surface chemistry, layered structure, and intriguing properties. The assembly of MXene sheets into macroscopic architectures is an important approach to harness their extraordinary properties. However, it is difficult to construct a freestanding, mechanically flexible, and 3D framework of MXene sheets owing to their weak intersheet interactions. Herein, an interfacial enhancement strategy to construct multifunctional, superelastic, and lightweight 3D MXene architectures by bridging individual MXene sheets with polyimide macromolecules is developed. The resulting lightweight aerogel exhibits superelasticity with large reversible compressibility, excellent fatigue resistance (1000 cycles at 50% strain), 20% reversible stretchability, and high electrical conductivity of ≈4.0 S m −1 . The outstanding mechanical flexibility and electrical conductivity make the aerogel promising for damping, microwave absorption coating, and flexible strain sensor. More interestingly, an exceptional microwave absorption performance with a maximum reflection loss of −45.4 dB at 9.59 GHz and a wide effective absorption bandwidth of 5.1 GHz are achieved.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Haohuan Yuan,Wenting Xiao,Xin Zhang,Jiao Bao,Wei Li,Bo Huang,Guannan He
Efficient carrier separation and high electron migration efficiency are essential for sustainable H 2 energy production via photocatalysis . In this work, a Mn 0.5 Cd 0.5 S/Ti 3 C 2 MXene/g-C 3 N 4 all-solid-state Z-scheme photocatalyst is constructed by a series of processes, including low temperature calcination , etching, ultrasonication and solvothermal process. The appropriate energy band structures of g-C 3 N 4 and Mn 0.5 Cd 0.5 S enable the formation of the Z-scheme system, achieving efficient carrier separation. The Ti 3 C 2 MXene flakes assembled between g-C 3 N 4 nanosheets and Mn 0.5 Cd 0.5 S particles can accelerate the charge migration rate in the system. The optimized ternary composite exhibits the highest hydrogen evolution rate (HER) of 13.7 mmol g −1 h −1 , which is much higher than that of the pure g-C 3 N 4 and Mn 0.5 Cd 0.5 S. Meanwhile, the apparent quantum yield (AQY) value of the composite at 420 nm reaches up to 24.07 % and exhibits high stability. Based on the characterization, the photocatalytic mechanism of carrier transfer in the Z-scheme heterojunction is also revealed. The finding of this article provides insights into the high efficiency of carrier transfer and separation in the photocatalytic reactions.
研究领域:
材料科学
·
能源化学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）