CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yu Xu,Haoyu Qi,Mingming Sun,Zongxu Liu,Qing Liu,Kang Li,Wei Guo
While light-driven motors that can exhibit characteristic response have attracted significant research attention, they generally lack a stable and editable structure for exploration the versatile motions and their practical applications. Herein, a MXene/Polyurethane (PU) motor with robust “brick-and-mortar” structure was configured as the platform to study the light-driven self-propelled behaviors and mechanisms. Our experimental and theoretical results demonstrated that the external near-infrared laser (NIR) light stimulus triggers the photothermal Marangoni effect to create the local difference in surface tension, which serves as the driving force to overcome the flow resistance. The MXene/PU motor floating on the water phase exhibited programmable motion under the irradiation of NIR light, especially, complex motions such as directed motion, clockwise and counterclockwise rotations, and intermittent motion (alteration between resting and moving states). More interestingly, the MXene/PU motor can not only move along any complicated routes such as maze but also execute the stir task at designated place on the water surface. We believe that the fabricated MXene/PU motor has potential to fundamentally solve challenges in cargo transport and beyond, and the concept of remote motion-control of micro-objects by external stimulus can inspire further explorations of design of self-propelled motors and systems.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hui Zhi,Xiaobo Zhang,Fengya Wang,Liang Feng
Dehydration has always been a confusing problem for a hydrogel exposed to air, which restricts its application in practical detection. While an ionogel with unique properties can lock water molecules efficiently due to its low vapor pressure, the design and development of an ionogel with excellent water-locking properties and stability to achieve satisfactory detection are thus highly desirable. In this work, a pH-sensitive, stretchable, antibacterial, and stable ionogel artificial tongue was fabricated through dual cross-linking. The artificial tongue consisted of MXene as a cross-linking agent, phenol red as an indicator, gelatin, N-(2-hydroxyethyl) acrylamide, and 1-butyl-3-methylimidazolium chloride as the three-dimensional polymer network. A small quantity of MXene was used as a cross-linker the first time to promote the initiator in the system to generate free radicals, accelerating the reaction process and the multilevel linkage among the polymers. Meanwhile, the indicator phenol red was introduced into the ionogel successfully for the first time, showing great stability in 5 weeks. After evaluation by the Brand–Altman analysis, it was found that the method of pH measurement using ionogels had good consistency with the pH meter measurement method. Additionally, the prepared ionogel presented excellent water retention, mechanical stretchability, antibacterial property, and stability, as well as good test results in the test of artificial simulated saliva, demonstrating great potential in clinical applications.
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DOI
高影响因子
Advanced Membranes
·
2022
·
IF 0
Huan Qin,Haoyu Wu,Shu-Mao Zeng,Fan Yi,Si-Yong Qin,Yue Sun,Li Ding,Haihui Wang
Osmotic energy is a kind of blue energy that has recently been identified as an additional source of clean energy. Using a membrane-based reverse electrodialysis (RED) process, this blue energy can be obtained from acidic industrial wastewater with different proton concentration gradients. However, this process demands high-performance membrane that can withstand harsh environments, possessing the advantages of wide pH tolerance, high-temperature resistance and chemical stability, developing such membranes remain a challenge. Herein, we report a two-dimensional (2D) lamellar Ti 3 C 2 T x MXene membrane-based RED device for osmotic energy capturing from proton gradients. Such a membrane exhibits a typical surface-charge-governed ion transport feature. Moreover, the MXene membrane-based energy harvesting device holds the merits of outstanding pH and temperature resistance. It exhibits an output power density of 6.5 W/m 2 and also demonstrates stability over 200 h at pH = 0, which is 30% higher than the commercialization benchmark (5 W/m 2 ). The osmotic power density can be further enhanced to 11.1 W/m 2 at 330 K, demonstrating excellent thermal and chemical stability. This work can help better understand protons' transport behaviors in MXene membranes and open new avenues for applications in sustainable power conversion and wastewater treatment.
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DOI
ACS Applied Engineering Materials
·
2022
·
IF 0
Qiang Xue,Jinyuan Zhu,Wenqiao Meng,Kaisong Zhang
The effects of different dispersed phases of MXene nanosheets on polyamide nanofiltration membranes, which was first reported in this investigation, are still unclear. We found that when the MXene nanosheets were dispersed into the aqueous phase, the cross-linking degree of the interfacial polymerization (IP) reaction was low, thereby forming a rough and thin polyamide layer with nanovoids, which increased the pure water flux to 14.1 L m2– h–1 bar–1. When the MXene nanosheets were dispersed into the organic phase, the IP reaction was more thorough with a high degree of cross-linking. Therefore, the salt rejection was higher, with 99.1% of Na2SO4 rejection. We believe that different dispersed phases for 2D nanosheets had different impacts on the IP reaction and polyamide layer and we hope this study can provide ideas for selecting a suitable dispersed phase to develop optimization strategies.
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DOI
CARBON
·
2022
·
IF 11.307
Chenyang Jiao,Zhiming Deng,Peng Min,Jingjing Lai,Qingqiang Gou,Rong Gao,Zhong-Zhen Yu,Hao-Bin Zhang
MXene-based electromagnetic interference (EMI) shielding nanocomposites are promising candidates to ensure the stable operation of flexible and wearable electronic devices. However, it remains a considerable challenge to develop high-performance flexible polymer/MXene composites with excellent broadband EMI shielding efficiency and healing capability. Herein, we select waterborne polyurethane (WPU) and natural rubber (NR) as the polymer matrices to fabricate flexible and healable WPU/NR/MXene composite films by forming continuous honeycomb-like conductive network using the electrostatic repulsion interaction and vacuum-assisted filtration strategy. Consequently, the WPU/NR/MXene composite films of 339 μm thick achieve an average EMI shielding performance exceeding 76.1 dB in the wide frequency range of 8.2–40.0 GHz when the MXene content is only 5.48 vol%. Compared to the WPU/NR film, the composite films show 10.3 and 8.8 times increments in tensile strength and toughness, respectively. Furthermore, the composite films can elevate their surface temperature to >114 °C under 200 mW cm −2 near-infrared light irradiation within 3 min, which can activate the PU chain segments and the hydrogen bonds between MXene and WPU to afford an interesting healable capability. Therefore, the multifunctional composite film with rapid photothermal healing property can ultimately keep its mechanical and shielding performances, and greatly extend its practical application areas.
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DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Fangya Qi,Yulu Tang,Chen Zhao,Zhaoqiang Zheng,Xiaoteng Jia,Yonggang Min
Two-dimensional transition-metal carbide (MXene) Ti3C2Tx possesses advantages of high conductivity and high volumetric capacitance, making it an ideal electrode material for high-performance supercapacitors. However, the high stiffness impedes its direct implementation in stretchable supercapacitors for integrated wearable electronics. Here, we demonstrate a stretchable supercapacitor based on Ti3C2Tx electrodes through a device-scaled controlled crumpling strategy. An ultrathin supercapacitor with a thickness of about 45 μm is assembled with gold foil gilded ultrathin preservative membrane as a current collector, drop cast Ti3C2Tx as an active material, and poly(vinyl alcohol)-H3PO4 as a polymer gel electrolyte. The ultrathin supercapacitor with optimized electrodes exhibits an areal specific capacitance of 10.2 mF cm–2 at 5 mV s–1 with excellent mechanical flexibility. The controlled adhesion of the ultrathin supercapacitor on a prestretched latex substrate and the elastic deformation of the substrate induce local displacements on the ultrathin supercapacitor to create periodic crumples. Stretching the crumpled supercapacitor only causes the amplitude and wavelength changes of the crumples, leading to a high level of stretchability (up to 100%). Also, the crumpled supercapacitor can sustain 1000 stretching cycles at a maximum strain of 100%. Moreover, it can provide sufficient power to drive α-In2Se3 nanoflake-based photodetector at 100% strain. This device-scaled controlled crumpling method provides a facile and effective way to design stretchable energy devices with high stretching durability for stretchable devices.
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DOI
高影响因子
Research
·
2023
·
IF 11
Jun Wu,Yinghui Li,Shengshun Duan,Zhehan Wang,Xu Jing,Yucheng Lin,Di Zhu,Wei Lei,Qiongfeng Shi,Li Tao
Temperature sensing is of high value in the wearable healthcare, robotics/prosthesis, and noncontact physiological monitoring. However, the common mechanic deformation, including pressing, bending, and stretching, usually causes undesirable feature size changes to the inner conductive network distribution of temperature sensors, which seriously influences the accuracy. Here, inspired by the transient receptor potential mechanism of biological thermoreceptors that could work precisely under various skin contortions, we propose an MXene/Clay/poly(N-isopropylacrylamide) (PNIPAM) (MCP) hydrogel with high stretchability, spike response, and deformation insensitivity. The dynamic spike response is triggered by the inner conductive network transformation from the 3-dimensional structure to the 2-dimensional surface after water being discharged at the threshold temperature. The water discharge is solely determined by the thermosensitivity of PNIPAM, which is free from mechanical deformation, so the MCP hydrogels can perform precise threshold temperature (32 °C) sensing under various deformation conditions, i.e., pressing and 15% stretching. As a proof of concept, we demonstrated the applications in plant electronics for the real-time surface temperature monitoring and skin electronics for communicating between human and machines. Our research opens venues for the accurate temperature-threshold sensation on the complicated surface and mechanical conditions.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zexiang He,Deshun Huang,Guozong Yue,Jing Zhu,Pengxiang Zhao
Three-dimensional (3D) porous MXene gel (MXene-Ca) was synthesized through a fast gelation of Ti 3 C 2 T x MXene nanosheets initiated by calcium ions. The MXene-Ca showed efficient phosphate adsorption ability through the strong chemical reaction between Ca 2+ and phosphate with a fast adsorption equilibrium (within 2 min). Furthermore, the recovered P/MXene-Ca gel after phosphate sorption could be used for adsorption of uranium in aqueous solution. Various analysis including SEM, TEM, XRD, XPS, FT-IR, BET surface area and zeta potential were carried out to fully characterize the materials. Increased specific surface area of the 3D porous structure and the formation of newly active adsorption sites of hydroxyapatite in P/MXene-Ca gel, are two main factors promoting the removal of U(VI). The maximum adsorption capacity was 823.6 mg/g at 298 K by Langmuir isotherm model. Kinetic studies disclosed that the of U(VI) followed the major chemical adsorption process. Overall results from batch experiments, leaching experiments, and characterizations demonstrated that the main mechanisms of the U(VI) removal by P/MXene-Ca including chemical adsorption on hydroxyapatite via dissolution precipitation and surface complexation with the oxygen-containing functional groups of MXene.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Guanghui Liu,Qingshan Xiong,Yunqi Xu,Qunling Fang,Ken Cham-Fai Leung,Min Sang,Shouhu Xuan,Lingyun Hao
Harmful bacteria are common substances in water that endanger human health, so it is urgent to establish a simple system that can tackle these hazardous substances simultaneously. In this work, a novel magnetic MXene@Fe 3 O 4 /Au/polydopamine (PDA) nanosheet with excellent photothermal-magnetolytic coupling antibacterial performance is developed. MXene , Au and polydopamine all have good photothermal properties, so the photothermal conversion efficiency of the MXene@Fe 3 O 4 /Au/PDA nanosheet reaches as high as 48.7%. After 6 min of 808 nm laser irradiation, the MXene@Fe 3 O 4 /Au/PDA nanosheets (120 μg·mL −1 ) can achieve nearly 100% antibacterial effect against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). In comparison to the sole photothermal treatment, the nanosheet at lower concentration (80 μg·mL −1 ) also exhibit stronger antibacterial properties against both Gram-negative and Gram-positive bacteria during the photothermal-magnetic coupling treatment. The result is mainly because the heat generated by the photothermal effect of the nanosheet is directly transferred to the cell membrane, and the edge of the nanosheet cuts the cytomembrane similar to a magnetic “hot nanoblade”, resulting in subsequent shrinkage, deformation and even rupture.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Zicheng Li,Yingkui Guo,Hongyan Yue,Xin Gao,Shuo Huang,Xiaohua Zhang,Yanfei Yu,Haopeng Zhang,Hengwei Zhang
EP is an important natural catecholamine neurotransmitter in the central nervous system, and the change of EP concentration will lead to many diseases. Therefore, rapid and sensitive detection of EP is of great significance for clinical research. The Ti 3 C 2 T x MXene dispersion obtained by in-situ HF etching Ti 3 AlC 2 was mixed with graphene oxide (GO) dispersion synthesized by the modified Hummers method. After freeze drying and heat-treatment, the reduced graphene oxide/Ti 3 C 2 T x MXene (GMA) was obtained and then the GMA was moved onto indium tin oxide (ITO) as the GMA/ITO working electrode for electrochemical detection of epinephrine (EP). The results are as follows: Ti 3 C 2 T x MXene with a diameter of approximately 150 nm is uniformly distributed on the surface of the 3D graphene. The three-dimensional structure of GMA facilitates the entry of bioactive molecules and increases the contact area. GMA/ITO has a high sensitivity for the determination of EP 3.74 μA·μM −1 ·cm −2 . Moreover, the electrode shows a very low detection limit, well repeatability and stability, and it can detect the EP content in real urine samples.
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DOI
高影响因子
Small
·
2022
·Vol. 18
·期 27
·2202203
·
IF 15.153
Ke Lv,Jizhen Zhang,Xu Zhao,Na Kong,Jinlong Tao,Ji Zhou
Wearable electronics demand energy storage devices with high energy density and fast charging-discharging rates. Although various porous electrodes have been constructed, the effect of pore size on the capacitive performance of 2D nanomaterials has been rarely studied. Herein, flexible MXene foams with significantly different pore structures are fabricated using varying diameter polystyrene (PS) spheres (80, 310, and 570 nm), which shows uniform pores and interconnected pores providing enough active sites and a good electrical connection for electron transfer. Noteworthy, when MXene flakes and templates (310 nm) have a similar size, the foam delivers the highest gravimetric capacitance of 474 ± 12 F g −1 at 2 mV s −1 than others. Additionally, the mass ratio between MXene and PS controls the packing density of foams influencing the inner resistance of foam electrodes. A carbon nanotube is introduced to further improve the electrical conductivity of foams to achieve a capacitance of 462 ± 8 F g −1 at 2 mV s −1 and retains 205 ± 10 F g −1 at 1000 mV s −1 , demonstrating promises in energy storage applications and providing an insightful guidance for designing 2D nanomaterials-based porous electrodes for supercapacitors.
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DOI
高影响因子
CATALYSIS TODAY
·
2017
·
IF 4.636
Yanping Fan,Zhenluo Yuan,Guodong Zou,Qingrui Zhang,Baozhong Liu,Qiuming Peng
Differing from graphene with a carbon element component, analogous metallic-graphene two-dimensional layered titanium carbide (2D MXene) provides more opportunities to achieve better surface functionalization. Herein, a thin layered 2D MXene/A-TiO 2 composite was prepared by chemical exfoliation and hydrothermal decomposition. The 2D MXene/A-TiO 2 composite exhibits high catalytic activity in the adsorption and desorption of hydrogen kinetics for NaAlH 4 . The critical dehydrogenation temperature of NaAlH 4 is ∼90 °C. The first-stage dehydrogenation (∼3.0 wt.%) is accomplished in 50 min at 110 °C. After the first activated cycle, a constant cycling capacity of 4.7 wt.% is remained for a minimum of five cycles tests. It is found that the excellent catalytic activation should be ascribed to the synergistic effect between homogenous distributed Ti-H and TiC, which are originated from MXene/A-TiO 2 . The results represent a new step forward in the applications of MXene catalytic dehydrogenation and provide new strategies in the quest for new functional MXene derivatives by in-situ modification.
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DOI
高影响因子
危险品化学品经营许可证（带存储）