ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xia-chao Chen,Ke-feng Ren,Jing Wang,Wen-xi Lei,Jian Ji
Introducing a lubricant layer onto surfaces has emerged as a novel strategy to address a wide range of interface-related challenges. Recent studies of lubricant-infused surfaces have extended beyond repelling liquids to manipulating the mobility of fluids. In this study, we report a design of slippery surfaces based on infusing lubricant onto a polyelectrolyte multilayer film whose surface microstructures can be erased rapidly under mild condition. Unlike other lubricant-infused surfaces, the liquid movements (e.g., moving resistance and direction) on such surfaces can be manipulated via programming the surface microstructures beforehand. The work reported here offers a versatile design concept of lubricant-infused surfaces and may turn on new applications of this emerging class of bioinspired materials.
研究领域:
材料科学
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表面工程
·
流体动力学
·
仿生材料
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DOI
PubMed
高影响因子
Small
·
2024
·
IF 13
Yu Chen,Mengyao Gao,Kun Chen,Huili Sun,Haonan Xing,Xiaoqing Liu,Weijie Liu,Haizhong Guo
As a kind of flexible electronic device, flexible pressure sensor has attracted wide attention in medical monitoring and human-machine interaction. With the continuous deepening of research, high-sensitivity sensor is developing from single function to multi-function. However, Current multifunctional sensors lack the ability to integrate joule heating, detect sliding friction, and self-healing. Herein, a MXene/polyurethane (PU) flexible pressure sensor with a self-healing property for joule heating and friction sliding is fabricated. The MXene/PU sensitive layer with special spinosum structure is prepared by a simple spraying method. After face-to-face assembly of the sensitive layers, the MXene/PU flexible pressure sensor is obtained and showed excellent sensitivity (150.65 kPa −1 ), fast response/recovery speed (75.5/63.9 ms), and good stability (10 000 cycles). Based on the self-healing property of PU, the sensor also has the ability to heal after mechanical damage. In addition, the sensor realizes the joule heating function under low voltage, and has the real-time monitoring ability of sliding objects. Combined with low cost and simple manufacturing method, the multi-functional MXene/PU flexible sensor shows a wide range of application potential in human activity monitoring, thermal management, and slip recognition.
研究领域:
材料科学
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柔性电子
·
传感器技术
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产品关联
DOI
PubMed
高影响因子
Small
·
2024
·Vol. 20
·期 35
·2401622
·
IF 13
Jian Zou,Xin Jing,Shitao Li,Peiyong Feng,Yi Chen,Yuejun Liu
Single-network hydrogels are often too fragile to withstand mechanical loading, whereas double-network hydrogels typically exhibit significant hysteresis during cyclic stretching-releasing process due to the presence of a sacrificial network. Consequently, it is a considerable challenge for designing hydrogels that are both low in hysteresis and high in toughness for applications requiring dynamic mechanical loads. Herein, the study introduced a novel “sliding tangle island” strategy for creating tough and low-hysteresis hydrogels, which are prepared through in situ polymerization of highly concentrated acrylamides (AM) to form numerous entanglements within the MXene spacing without any chemical crosslinker. The MXene entangled with long polyacrylamide (PAM) chains to form tangle island that served as a relay station to transmit stress to neighboring molecular chains. This mechanism helps alleviate stress concentration and enhances energy dissipation efficiency, thereby reducing mechanical hysteresis. The resulting hydrogel exhibited exceptional properties, including high stretchability (≈900%), low hysteresis (less than 7%), high toughness (1.34 MJ m −3 ), and excellent sensing performance to rival the commercial hydrogel electrode. Therefore, this work sheds light on feasible design of energy dissipation structure to reduce the hysteresis of the composite hydrogels.
研究领域:
材料科学
·
生物医学工程
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DOI
PubMed
高影响因子
TRIBOLOGY LETTERS
·
2020
·Vol. 68
·期 4
·1-11
·
IF 2.566
Shen Ming–xue,Rong Kang–jie,Li Chun–hong,Xu Bin,Xiong Guang–yao,Zhang Ren–hui
This work investigates in situ friction-generated copper nanoparticles at the sliding in the precursor solution of copper formate tetrahydrate and octylamine, which induced by frictional heat, it can effectively mitigate wear while slightly reducing friction coefficient. The frictional heat between tribo-pairs accelerated the decomposition of the precursor into in situ generated copper nanoparticles, as indicated by black stripe regions on the worn surface. This study opened a new strategy to achieve low friction and wear through the thermal decomposition of the liquid lubricants during sliding.
研究领域:
材料科学
·
摩擦学
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DOI
高影响因子
Small
·
2025
·
IF 12.1
Xuan Jiao,Binrui Wu,Jiahao Li,Yuanyuan Yang,Wancheng Gu,Feiyan Fu
Developing highly durable coatings, endowing comprehensive protection capabilities of antifouling, drag reduction, and corrosion resistance in underwater settings, holds paramount significance for modern maritime undertakings. However, the inferior multifunctional compatibility and weak structural strength have proven to pose an extremely formidable challenge. Herein, this study reports an internally self-sliding coating that imparts liquid-repellence and ion permeation resistance without the necessity of a complex fabrication process. The key lies in combining integrated structure-function strategy with particle close-packing method of fluorine-grafted layered silicate particles. These particles demonstrate and exhibit a unique self-sliding property due to the weak van der Waals forces between the lamellae from the typical layered crystal structure. The durability and underwater protection of these coatings are clearly demonstrated by their outstanding mechanical wear resistance, a drag reduction efficiency of up to 25%, and the capacity to remain corrosion-free in saltwater for over 1000 h. Owing to the slippery frictional action and the closely packed surface microstructure, the coating demonstrates outstanding long-term stability and anti-permeability properties. This strategy offers a universal design framework for engineering ultra-durable coatings applicable to a diverse range of underwater comprehensive protection applications.
研究领域:
材料科学
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海洋工程
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产品关联
DOI
PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 5
·期 1
·195-208
·
IF 5.693
Luo Xin,Lai Hua,Cheng Zhongjun,Liu Pengchang,Li Yufen,Liu Yuyan
Smart slippery surfaces with intelligent liquid droplet manipulation performance have aroused much attention. The lubricant and surface microstructure are two key factors that govern the droplet’s sliding performance. However, for almost all existing surfaces, only one factor can be regulated, which significantly limits their wetting performances and applications. Herein, by integrating the temperature-responsive lubricant and shape memory surface microstructure, we report a novel slippery surface. On this surface, the solid/liquid phase transition of the lubricant provides the surface with the ON/OFF control for droplet’s movement between the sliding state and pinning state, and the tunable surface microstructure based on material’s shape memory effect offers the programmable sliding directions. Due to the combined effect, diverse liquid transportation programs with random ON/OFF manner and arbitrary direction were further demonstrated on this surface. This work advances a new slippery surface with controllable lubricant and surface microstructure, which not only provides insights into the design for smart slippery surfaces but also provides a promising material for application in smart control of droplet motion. Graphical abstract
A novel shape memory slippery surface is prepared, on which both the lubricant and surface microstructure can be reversibly controlled.
研究领域:
材料科学
·
表面工程
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产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Mohamed Kamal Ahmed Ali,Qiangliang Yu,Feng Zhou,Bin Li,Chaoyang Zhang
Wear is one of the most important factors limiting mechanical components' lifespan and durability. In this study, a novel, AISI 4140-Ag steel-based, self-lubricating nanocomposite was manufactured by the spark plasma sintering (SPS) technique. The high-level aim of this investigation is to obtain a deeper understanding of how silver (Ag) at the nanoscale can enhance the self-lubricating layer's replenishment, which aids in maintaining a steady supply of solid lubricant under dry conditions. Tribological experiments were conducted under various loads (30–150 N) at 5 Hz frequency and 300 °C temperature using a Rtec Universal Tribometer (ball-on-disc setup). After that, advanced surface characterization techniques were utilized to illustrate predominant wear modes, lubrication mechanisms , and the chemical identity of the self-lubrication layer. Noticeably, the AISI 4140-Ag nanocomposite reduced the friction coefficient and wear rate by 36.16–51.14 % and 93.40–97.36 %, respectively, compared to the AISI 4140 composite. The excellent self-lubricating performance is mainly attributed to the replenishment of a self-lubricating layer on the substrate material and a transfer layer on the counterbody, composed of AgO and Fe 2 O 3 . The results of our study hold considerable promise for the advancement of self-lubricating composites and the enhancement of their durability in mechanical applications.
研究领域:
材料科学
·
机械工程
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DOI
高影响因子
MACROMOLECULES
·
2023
·
IF 5.5
Xing Liu,Jian Tang,Quan Chen,Lizhu Wang
In the present work, the topological hydrogels are prepared through cross-linking Tetra-PEG chains using catenated junctions of bis(phenanthroline) complexed by metal ions. The catenated junctions are either interlocked through metal–ligand coordination, unlocked through demetalation, or relocked through remetalation. Once unlocked, the cross-links become slidable, thereby leading to a reduction of the elasticity, and the degree of reduction depends on the detailed topological structure, particularly the number of network defects. The mechanical properties of the prepared Tetra-PEG can be tuned by changing either the species of the metal ions or the pH values. In comparison, for the linear PEG precursor, the gel-to-sol transition occurs upon demetalation that leads to the formation of linear chains (i.e., precursor chains connected by the catenated junctions). The paradigm described in this work offers a synthetic approach to the hydrogels with varied cross-links.
研究领域:
材料科学
·
化学
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DOI
高影响因子
Friction
·
2023
·Vol. 11
·期 12
·2329-2341
·
IF 6.8
Zhao Yiming,Yi Gang,Cui Jiuyu,Zhao Ziqian,Yan Yonggan,Wei Luxing,Shao Jinlong,Zeng Hongbo,Huang Jun
Understanding the friction behavior of hydrogels is critical for the long-term stability of hydrogel-related bioengineering applications. Instead of maintaining a constant sliding velocity, the actual motion of bio-components (e.g., articular cartilage and cornea) often changes abruptly. Therefore, it is important to study the frictional properties of hydrogels serving under various sliding velocities. In this work, an unexpected low friction regime (friction coefficient μ < 10 −4 at 1.05×10 −3 rad/s) was observed when the polyacrylamide hydrogel was rotated against a glass substrate under alternative sliding velocity cycles. Interestingly, compared with the friction coefficients under constant sliding velocities, the measured μ decreased significantly when the sliding velocity changed abruptly from high speeds (e.g., 105 rad/s) to low speeds (e.g., 1.05×10 −3 rad/s). In addition, μ exhibited a downswing trend at low speeds after experiencing more alternative sliding velocity cycles: the measured μ at 1.05 rad/s decreased from 2×10 −2 to 3×10 −3 after 10 friction cycles. It is found that the combined effect of hydration film and polymer network deformation determines the lubrication and drag reduction of hydrogels when the sliding velocity changes abruptly. The observed extremely low friction during alternative sliding velocity cycles can be applied to reduce friction at contacted interfaces. This work provides new insights into the fundamental understanding of the lubrication behaviors and mechanisms of hydrogels, with useful implications for the hydration lubrication related engineering applications such as artificial cartilage.
研究领域:
生物工程
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材料科学
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生物力学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zhiqiang Yu,Zhiyong Ji,Dihao Tao,Qiaoxin Zhang,Rong Liu
A simple, efficient and low-cost method is proposed to prepare surfaces with reversible superwettability and excellent corrosion resistance. Superhydrophobic surfaces are successfully obtained on the copper alloys by etching, heat treatment, and then stearic acid modification, exhibiting extraordinary water repellence with a static contact angle of 159.7 ± 1.2°, and a sliding angle of 3.1 ± 0.6°. The reversible transition of the superwetting state are successfully achieved. The surface can be turned into a superhydrophilic state by simple heat treatment. And then, it can be turned into a superhydrophobic state by re-modification. Meanwhile, the effects of etching time and heat treatment temperature on wettability are also studied. Finally, the corrosion resistance of the copper alloys and the durability under various extreme conditions are investigated. The results show that the prepared superhydrophobic copper alloys have excellent corrosion resistance with a corrosion inhibition rate of 98.83% and superior durability, which will further expand its practical applications.
研究领域:
材料科学
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表面工程
·
腐蚀与防护
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Sisi Ma,Ligang Lin,Qi Wang,Yuhui Zhang,Honglei Zhang,Yixin Gao,Lin Xu,Fusheng Pan,Yuzhong Zhang
A three-dimensional (3D) strategy for the fabrication of ethylene vinyl alcohol (EVAL) membranes with a dynamic surface was developed based on sliding supramolecular polymer brushes (SSPBs). The SSPBs with a 3D hydrophilic structure were introduced into the alkyne–EVAL membrane matrix via an azide–alkyne click coupling reaction. The self-mobile hydrophilic slide-rings in the SSPB provided a proactive exclusion system. This resulted in reduced direct contact of the membrane surface with multiple pollutants such as bovine serum albumin (BSA) and oil droplets. The EVAL-SSPB membrane demonstrated increased surface hydrophilicity, underwater oleophobicity, and antifouling properties. More importantly, the abundant hydrophilic rings in the membrane matrix result in supramolecular assembly and efficient hydrophilic sliding channels. This resulted in a dramatic increase in the water flux [2000 L/(m2 h)] while retaining a 96% rejection of BSA and oil/water emulsions. The results of the study indicate that three effects of the cyclodextrins rings, i.e., the hydrophilic effect, the exclusion effect, and the sliding effect, enabled the improved membrane performance. The demonstrated 3D fabrication strategy is versatile, facile, and scalable, which allows for its application to various other membranes. The fabricated materials possess excellent permeability and separation efficiencies, which make them attractive candidates for use as separation membranes with novel functions.
研究领域:
材料科学
·
环境工程
·
化学工程
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DOI
PubMed
高影响因子
MEASUREMENT
·
2025
·
IF 5.6
Xin Niu,Ying Yang,Lingzhu Wang,Yuanjun Liu,Xiujuan Wang,Hao Liu
During dynamic measurements, single-layer fabric biopotential dry electrodes are prone to slip between the electrode and the skin, resulting in more measurement noise. The double-layer structure of the spacer fabric (SF) reduces the relative slip between the bottom of the electrodes and the skin, and obtains better signal quality. In this study, low-slip, corrosion-resistant ECG signal acquisition electrodes based on double-layer SF were developed by silver plating, chlorination and thiol treatment processes. The effects of electrode structure, chlorination time and thiol treatment time on electrode performance were investigated. Compared with the single-layer fabric, the slip at the bottom of the double-layer SF was reduced by 84.6 % at a pressure of 70 cN and a motion displacement of 10 mm. The corrosion inhibition efficiency of the electrode after the thiol-etching treatment was 70.8 %, and a stable ECG signal could still be obtained after etching with sodium sulfide solution.
研究领域:
生物医学工程
·
材料科学
·
医学电子学
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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）