Friction
·
2024
·Vol. 12
·期 8
·1728-1740
·
IF 6.3
Cui Yuhong,Xue Shenghua,Wang Tiantian,Liu Shujuan,Ye Qian,Zhou Feng,Liu Weimin
Herein, we have prepared SiO 2 particles uploaded MXene nanosheets via in-situ hydrolysis of tetraetholothosilicate. Due to the large number of groups at the edges of MXene, SiO 2 grows at the edges first, forming MXene@SiO 2 composites with a unique core-rim structure. The tribological properties of MXene@SiO 2 as lubricating additive in 500 SN are evaluated by SRV-5. The results show that MXene@SiO 2 can reduce the friction coefficient of 500 SN from 0.572 to 0.108, the wear volume is reduced by 73.7%, and the load capacity is increased to 800 N. The superior lubricity of MXene@SiO 2 is attributed to the synergistic effect of MXene and SiO 2 . The rolling friction caused by SiO 2 not only improves the bearing capacity but also increases the interlayer distance of MXene, avoiding accumulation and making it more prone to interlayer slip. MXene@SiO 2 is adsorbed on the friction interface to form a physical adsorption film and isolate the friction pair. In addition, the high temperature and high load induce the tribochemical reaction and form a chemical protection film during in the friction process. Ultimately, the presence of these protective films results in MXene@SiO 2 having good lubricating properties.
研究领域:
材料科学
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机械工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Zhen-wei Guo,Yan-fen Mo,Meng-yuan Luo,Yu-hui Xie,Dong Feng,Feng Wu,Yi Mei,Delong Xie
Ammonia is commonly used as a preservative for natural rubber, but its high volatility and strong irritation to the human respiratory tract pose significant health risks. In this study, we utilized the layered two-dimensional nanomaterial Ti 3 C 2 T x (MXene) as an antimicrobial agent and synthesized MXene-SiO 2 nanocomposites by intercalating KH550-modified silica nanoparticles into MXene. This nanocomposite was then incorporated into a MXene-SiO 2 /low-ammonia preservation system. The results demonstrated that this novel system effectively preserved concentrated natural latex over a four-month period. Throughout this time, the volatile fatty acid (VFA) values remained below 0.1, the pH was stable at approximately 10, the mechanical stability time (MST) exceeded 700 s, and viscosity remained around 300 mPa·s—meeting the requirements for subsequent processing. The introduction of the MXene-SiO 2 nanocomposite into the preservation system had no adverse effects on the structure or performance of the dry film. The system exhibited excellent film-forming properties and promoted the formation of a cross-linked network in the vulcanized film. As a result, the tensile strength of the vulcanized film reached 22.87 MPa, a 64% increase compared to pure natural latex vulcanized film. this study provides an effective and environmentally friendly approach for preserving natural latex while simultaneously enhancing the mechanical properties of its vulcanized film.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Yixiang Chen,Tongcheng Zuo,Yu Jiang,Jiajia Gui,Wanqi Feng,Dan Yu,Wei Wang
Flexible pressure sensors embody outstanding mechanical and sensing performance, particularly in the fields of personal health monitoring and artificial intelligence, while catering to multifunctional applications resilient against harsh weather conditions. Among these, Ti 3 C 2 T x MXene-based aerogel materials with high surface area and excellent conductivity have attracted a lot of attention. However, there are big challenges in improving the mechanical properties at low densities and designing multi-level pore structures . Herein, the prepared silane monomers (MP) are firstly synthesized by 3-(Trimethoxysilyl) propyl methacrylate (MPTES) and polyethylene glycol diacrylate (PEGDA), then polydopamine-modified silicon dioxide (PDA-SiO 2 ) nanofibers employed with MXene nanosheets form covalent cross-linking nanofiber aerogels. The multi-level stable structure improves both mechanical strength and elasticity. The assembled MXene/MP/PDA-SiO 2 pressure sensors exhibit a high sensitivity of −0.83 kPa −1 , a rapid response time of 48 ms, a minimum 1 % strain detection limit, and reliable stability over 10,000 cycles. Furthermore, these sensors can be used for human motion detection and health diagnostics, and show good personal thermal management performance. This work holds a promising candidate for the next generation of multifunctional flexible electronic devices.
研究领域:
材料科学
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传感器技术
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纳米技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yunlong Li,Mingming Liu,Xiaodong Zhou,Yongling Wu
Flexible wearable sensors have garnered significant attention for their potential applications in electronic skins, health monitoring, and smart devices. However, current flexible sensors often suffer from limitations, such as low sensitivity and inadequate resistance to mechanical and chemical degradation. To address these issues, this study presents a CPU@MXene@SiO2 superhydrophobic flexible sensor fabricated using a combination of electrospinning and dip-coating techniques. This sensor features a sandwich structure composed of an electrospinning fiber membrane (CPU) substrate, an MXene conductive coating, and a superhydrophobic SiO2 coating. Based on the fabricated sensor, strain and piezoresistive sensors were further assembled to systematically investigate the effects of micro/nanostructures and chemical compositions on wettability and sensing performance. Experimental results demonstrated that the CPU@MXene@SiO2 sensor exhibited outstanding comprehensive properties including high mechanical strength, superhydrophobicity (CA > 155°, RA < 3°), low adhesion force (33 μN) with water, high sensing sensitivity (gauge factor up to 4922.6), and fast response (response time of 94 ms). Moreover, to validate its potential for large-scale applications, a complete data acquisition system based on an STM32 microcontroller and a mobile application was designed and developed. A 4 × 4 sensor array was successfully fabricated and tested. This sensor demonstrates promising and attractive applications in wearable devices and human–machine interaction, offering an efficient design strategy for constructing robust and highly sensitive flexible sensors.
研究领域:
柔性电子
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传感器
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纳米技术
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材料科学
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可穿戴设备
·
人机交互
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产品关联
DOI
PubMed
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Hao Wang,Liu Yang,Xiaoke Li
Solar energy, recognized for its abundant and clean attributes, is a burgeoning renewable resource. Nanofluid photothermal conversion technology with volume absorption properties has been rapidly developed in recent years. This research optimized the performance of Ti 3 C 2 (MXene) nanofluid in solar photothermal conversion by integrating SiO 2 nanoparticles to form a composite nanofluid. The stability, thermal conductivity, and photothermal properties of the Ti 3 C 2 /SiO 2 nanofluids were comprehensively evaluated. The nanofluids demonstrated high stability, as evidenced by Zeta potentials all above 40 mV. Furthermore, the thermal conductivity of the nanofluids escalated with an increase in SiO 2 content. Specifically, the thermal conductivities of the composite nanofluids experienced an approximate 9 % enhancement when the temperature was elevated by 25 °C. The composite nanofluid had better light absorption because of SiO 2 nanoparticles’ forward scattering ability. The most efficient mixture (Ti 3 C 2 : 40 ppm and SiO 2 : 1000 ppm) reached a 67.35 % photothermal conversion efficiency, which is 5 % higher than the Ti 3 C 2 nanofluid alone at the same concentration. Rather than solely enhancing light absorption, this study provides a new pathway to improve the photothermal conversion efficiency of nanofluids by strengthening scattering. This contributes to enriching the theoretical and practical understanding of nanofluids in the field of photothermal conversion, offering scientific evidence and technical support.
研究领域:
材料科学
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太阳能技术
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纳米技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Mingxing Wang,Xiutong Wang,Youbo Nan,Hui Xu,Hui Zhou,Yanan Sun,Peijia Yi,Teng Yu
Raindrops are an abundant micromechanical renewable energy source in nature, and raindrop energy harvesting has always been a research hotspot. Traditional hydropower generation is not suitable for low-frequency energy harvesting, and it is difficult to realize distributed energy harvesting. The development of triboelectric nanogenerator (TENG) is a promising strategy for converting raindrop energy in the environment into electrical energy. Polydimethylsiloxane (PDMS) composite has received much attention due to its excellent chemical stability and insulating properties for TENG. However, the deficiency of the low output performance and insufficient hydrophobicity of PDMS limits the application of PDMS in droplet energy capture. Modification of PDMS can improve the droplet energy collection capability of the liquid–solid contact triboelectric (LS-TENG). In this work, a new approach to modifying polydimethylsiloxane (PDMS) as a hydrophobic negative triboelectric material using a high dielectric constant MXene and a hydrophobic nano-SiO 2 was reported. The as-prepared composites′ permittivity and triboelectric performance were remarkably promoted as compared to composites without interfacial modification. In addition, the use of composites for TENG assembly improved the open-circuit voltage and short-circuit current by a factor of 47.5 and 25.21, respectively, compared to pure PDMS. Application of the composite to the assembled TENG was employed as energy harvester to light up LEDs and charge a capacitor. In addition, a cathodic protection system was designed to demonstrate its potential application in the field of electrochemistry. This provides guidance for the practical implementation of TENGs in the field of electrochemical cathodic protection.
研究领域:
能量收集
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纳米技术
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材料科学
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电化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Wei Wan,Meizhen Tao,Hailin Cao,Yuqing Zhao,Junrong Luo,Jian Yang,Tai Qiu
Exploring flexible dielectrics with high dielectric constant and low loss is pertinent for many applications in electronic devices. In the present work, a non-ferroelectric polymer, polyvinyl alcohol (PVA), was used to fabricate homogeneous dielectric composite films with a relatively high dielectric constant and a low dielectric loss by using 2D nano sheets (Ti 3 C 2 T x MXene) as the filler. To limit dielectric loss, SiO 2 was coated onto the surface of MXene to provide interfacial barrier effect and suppress dielectric loss. MXene@SiO 2 /PVA composite films showed lower dielectric losses at low frequencies (from 20 Hz to ~ 10 kHz) compared with MXene/PVA composite films. MXene@SiO 2 /PVA composite films with 2.5 wt% MXene loading and 5 wt% (with respect to MXene content) SiO 2 coating had a dielectric constant of 27.2 (a 292.5% rise compared to neat PVA film) and a dielectric loss of only 0.057 (a 259.6% reduction compared to MXene/PVA composite film) at 100 Hz and room temperature (RT). In addition, this SiO 2 -coated composite film had stable dielectric properties (dielectric constant and loss change from 27.2 to 29.3 and 0.057 to 0.104, respectively) in the temperature range of RT to 60 °C. This work provides a promising way to fabricate PVA-based dielectric composites with excellent dielectric properties for practical applications in electronics.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
Materials Horizons
·
2025
·
IF 10.7
Shuo Zhang,Fushuo Wu,Feiyue Hu,Peiying Hu,Miaoping Li,Peng Zeng,Peigen Zhang,Tianyu Wang,Shuangshuang Chen,Jian Liu,Longzhu Cai,Zhengming Sun
Radar/infrared-compatible stealth materials enhance survivability by reducing the radar cross-section and suppressing infrared signatures. However, the significant differences in frequency characteristics across electromagnetic wavebands present challenges in optimizing cross-band electromagnetic response. To address this issue, we propose a cross-dimensional integration strategy. Zero-dimensional (0D) SiO2 aerogel particles with low thermal conductivity act as infrared radiation modulation component and two-dimensional (2D) Ti3C2Tx MXene nanosheets with high electronic conductivity function as the electromagnetic wave-responsive component; the 0D and 2D functional components are directionally anchored onto one-dimensional (1D) Kevlar nanofiber (KNF) surfaces through hydrogen bonding, cooperatively constructing a monolithic interconnected network structure. The as-designed MXene/SiO2/KNF aerogel (MSKA) has a bionic-inspired “root-soil” structure, which effectively reduces infrared radiation intensity through multiple scattering effects and enhances electromagnetic wave attenuation by optimizing spatial impedance matching and introducing multiple loss mechanisms. The MSKA exhibits excellent microwave absorption, achieving a minimum reflection loss of -64.69 dB at a thickness of 1.83 mm, with an effective absorption bandwidth (RL < -10 dB) covering 7.2 GHz; thermal testing reveals a surface temperature difference of 123.1 °C under a 175 °C heat source, indicating a significant reduction in infrared radiation intensity. This assembly strategy, enabling independent regulation of electromagnetic loss and thermal conduction through multidimensional integration, provides new insights for developing lightweight, high-performance, and multispectral stealth materials.
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产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2021
·Vol. 43
·期 1
·84-93
·
IF 3.171
Jiaming Guo,Tingtian Qiu,Chengxingzi Yu,Yu Liu,Chen Ning,Lingqiang Kong,Yan Ma,Liu Liu,Yuhui Ao
An unprecedented electrostatic self-assembly of MXene and SiO 2 on carbon fiber (CF) to enhance the interfacial properties of CF-reinforced epoxy resin composites is disclosed. MXene with negative charge was anchored on the cationized CF surface via a strong electrostatic interaction, followed by synergistic effect of amine-modified SiO 2 (positive charge) to furnish a stable MXene/SiO 2 material with three-dimensional structure, which takes the advantages of high modulus, large specific surface area, and high-surface activity. The involvement of the two nano-materials with different dimensions and morphologies results in synergistic enhancement on mechanical interlocking, leading to excellent chemical bonding connection between CF and resin, which could transfer stress and dissipate energy effectively. Moreover, the surface energy of CF increased from 26.67 to 48.12 mJ/m 2 after assembly of MXene/SiO 2 . Compared with unsized CF/EP composites, the interfacial shear strength, interlaminar shear strength, and flexural strength of CF/MXene/SiO 2 /epoxy (EP) composites were increased by 73.2%, 61.2%, and 39.2%, respectively. Dynamic mechanical analysis poxy (DMA) tests showed that the storage modulus of the CF/MXene/SiO 2 /EP composites was enhanced by 64% compared with CF/EP composites, and the glass-transition temperature of composites was elevated from 147.9 to 151.8°C. This protocol provides a promising strategy for designing advanced CF/EP composites with three-dimensional structure.
研究领域:
材料科学
·
复合材料工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）