APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Yunze Li,Changfeng lu,Kai Gao,Yi Zhang,Lin Zhang,Guoxin Xie
Perfluoropolyether (PFPE) is an excellent high-temperature lubricant; however, its poor affinity with additives such as MoS 2 , a common high-temperature lubricant additive, often leads to agglomeration and settling during storage, thereby reducing its tribological performance. To address this challenge, this study investigates the chemical grafting of MoS 2 using Trimethoxy (1H,1H,2H,2H-perfluorodecyl) silane (TMFS), achieving stable MoS 2 dispersion in PFPE that remains effective for up to 180 days. The grafted MoS 2 exhibits remarkable thermal stability, maintaining its integrity without decomposition even at temperatures reaching 250 °C. Compared with pure PFPE, the modified lubricant demonstrates a remarkably 36.8 % reduction in coefficient of friction and an 81.6 % decrease in wear rate at 200 °C. This research provides crucial theoretical insights and practical guidance for the future design of high-performance high-temperature lubrication systems.
研究领域:
材料科学
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化学工程
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Chen-Zheng Yan,Zhi-Yang Zhang,Chun-Yan Li,Song-Hai Wu,Yong Liu,Xu Han
Although the slippery liquid-infused porous surfaces (SLIPSs) exhibit highly antifouling performance against various working liquids, the loss of lubricant always deteriorates their long-term durability. Herein, a spongy composite of polyvinylidene difluoride (PVDF) and hydrangea-type perfluorooctyltrimethoxysilane (POTS)-modified mesoporous silica nanoparticles (MSNs) has been successfully prepared via the spraying method and used as the substrate for SLIPSs, which exhibits satisfactory storage and lock capacities for lubricant to enhance its durable antifouling performances. After infusing perfluoropolyether (PFPE) into the spongy substrate, a stable POTS-MSNs@PVDF@PFPE is prepared, which exhibits high amphiphobic performances (WSA of 1.68 ± 1.13° and OSA of 5.99 ± 1.34°) and high repellence to various working liquids, indicating its high antifouling performance. The long freezing time of 121.50 s and the low ice-adhesion strength of 25.67 kPa also indicate its high anti-icing performances. Furthermore, the high stability of POTS-MSNs@PVDF@PFPE after various thermal, chemical, and mechanical testing indicates its satisfactory durability. Actually, the abundant micropores of POTS-MSNs@PVDF provide adequate space for locking PFPE, thus prolonging its antifouling performances. This study provides an insight into the development of SLIPSs capable of maintaining long-term antifouling performance in harsh environments.
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
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IF 6.2
Jinglun Guo,Zhenling Shang,Yue Sun,Chenghao Li,Jianyi Xia,Yuxin Zou,Kang Du,Guoqiang Liu,Feng Zhou,Weimin Liu
Perfluoropolyether (PFPE) lubricant is widely used in plenty of cutting-edge technologies because of its extraordinary properties. However, poor boundary lubrication and creep limit their further applications. Here, we demonstrated a PFPE supramolecular gel with surface-functionalized Ti 3 C 2 T x as additives for highly efficient boundary lubrication and prevention of creep. It turned into an oily liquid at 124.5 °C, accompanied by a rapid decrease in viscosity. Additionally, the phase transition could be achieved by shear stress. This kind of gel reduced wear volume by 90.75% compared with pure PFPE oil. Its friction coefficient (∼0.113) varied slightly with time. Notably, its load-bearing capacity exceeded 1500 N. This work puts forward an approach to the preparation of PFPE-based supramolecular gel lubricant with surface-functionalized Ti 3 C 2 T x additive.
研究领域:
材料科学
·
润滑工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Tongyu Chen,Xiaoyue Yang,Zhanxiong Li
2 Spraying rough microspheres on the cotton fabrics' surface is an ingenious way to develop textiles with superhydrophobic properties. This paper reports a convenient and low-cost technique for synthesising hydroxyl-terminated polystyrene by atom transfer radical polymerisation (ATRP) and preparing PS-b-PFPE by introducing perfluorinated polyether chain segments through esterification. Simultaneously, PS-b-PFPE was prepared as a finishing solution, and the PS-b-PFPE microspheres were prepared by electrostatic spraying. The effects of different receiving distances, solvents, concentrations, voltage and flow velocity on the morphology and its size distribution of the spray microsphere were studied. The results show that when chloroform was used as a solvent, the working liquid concentration was 80 mg/mL, the flow rate was 0.8 mL/h, the receiving distance was 10 cm and the voltage was 10 kV, the obtained size distribution of the microspheres was narrow. In addition, the static contact angle of the PS-b-PFPE microspheres coating was 159° ± 1°, and the rolling angle was 1.8° ± 0.3°. Consequently, the PS-b-PFPE-coated cotton fabric had good oil–water separation and self-cleaning function with good mechanical stability.
研究领域:
材料科学
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纺织工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Jialiang Kang,Xueting Wang,Xiaoxiang He,Cun Lv,Caixia He,Zhanxiong Li
In this study, the perfluoropolyether carboxylic acid (PFPE-COOH) was used to react with polycaprolactone (PCL) to synthesise the hydrophobic block copolymer PCL- b -PFPE. The esterification reaction was performed successfully with the terminated hydroxyl group in the PCL-OH after activation of PFPE-COOH with N, N′ -dicyclohexyl carbon diimide. The PCL- b -PFPE was dissolved in various solvents to prepare microspheres using electrostatic spraying technology, and the flow rate, voltage, temperature and humidity parameters were optimised. The findings demonstrated that the solvent and ambient humidity had a substantial influence on the microspheres' surface morphology . Through smooth surface morphology, chloroform (CF) single solvent formed an ideal microsphere and DMF/CF mixed solvent produced a ‘pit’ surface morphology. Furthermore, the surface roughness of microspheres increases with an increase in humidity. The static contact angles of electrostatic spraying polyester fabric were 147.1° ± 1.8°, 150.9° ± 1.5°, 156.3° ± 2.6° and 155.9° ± 3.3°, under 20 %, 40 %, 60 % and 80 % humidity, respectively. The findings demonstrated that during the electrostatic spraying, the PFPE chain's introduction into PCL helped construct the secondary rough morphology on the microsphere surface and substantially enhanced the hydrophobicity of coatings, providing the finished polyester fabric super-hydrophobicity. The PCL-b-PFPE microspheres were directly sprayed and coated with the developed spray solution via electrostatic spraying. The water contact angle of the finished polyester fabric was found to be ≥140°, which provided hydrophobicity after 5 cycles of laundry. Following the sandpaper abrasion and adhesion tests, the contact angle of the fabrics coated with the microspheres remained ≥145°, indicating a good mechanical stability.
研究领域:
材料科学
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纺织工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2021
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IF 4.089
Jiajun Chen,Zhinan Fan,Chi Zhang,Huatian Duan,Li-Juan Fan
To detect neomycin, one of the common antibiotics in the environment and in food and which may pose harm to human health, a fluorescence sensing system based on an amphiphilic conjugated polyelectrolyte (CPE) was constructed. The CPE, PFPE-COONa, with poly[fluorenyl-alt-p-phenyleneethynylene] (PFPE) as the backbone and carrying four pendant hydrophilic carboxylate groups and two long hydrophobic alkoxyl chains in each repeat unit, was successfully synthesized. The photophysical study found that PFPE-COONa emission was solvent dependent, displaying a 58 nm red shift in wavelength and a nearly 150-fold enhancement in intensity for the emission maximum, by varying the ratios of the mixed solvent. Based on an understanding of the photophysics, the sensing condition was optimization to dissolve PFPE-COONa in the THF/H2O mixed solvent with a ratio of 1:1. The sensing system displayed excellent sensing performance toward neomycin at a neutral pH value. The blue-to-green fluorescence color change of the polymer solution, which can be clearly observed by the naked eye, upon around 0.7 μM of neomycin and the limit of detection (LOD) was calculated to be 0.78 nM. In addition, other possible interferents had no significant influence on the detection of neomycin. The mechanism study confirmed that the polymer aggregation, which induced strong electrostatic static interaction between the carboxylate groups of high density in the polymer and the dense positively charged primary amino groups in neomycin, was the main reason for such a visually fluorescent color change. This study provides a general strategy for the future design of sensing systems for organic pollutants.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
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