APPLIED SURFACE SCIENCE
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2026
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IF 6.9
Shilin Liu,Gaiqing Zhao,Junming Liu,Zhihuan Wang,Qianqian Zhu,Xiaobo Wang,Zhuang Xu
Modern mechanical transmission components face the multiple challenges of friction, wear, and electrical corrosion. To address these issues, the development of multifunctional additives that integrate superior tribological performance with high electrical conductivity has emerged as a critical strategy. In this study, CuS@MXene nanohybrids possessing both excellent tribological and conductive characteristics were designed and synthesized as multifunctional additives for supramolecular gels. The in-situ uniform loading of CuS nanoparticles onto the Mo 2 C MXene surface was achieved via molten salt etching and electrostatic adsorption strategies. Its tribological performance and lubrication mechanisms as a lubricant additives in supramolecular gels were investigated using a reciprocating friction and wear tester, X-ray photoelectron spectroscopy, and Focused Ion Beam-Transmission Electron Microscopy. Tribological evaluations revealed that, compared to the pure gel, the gel containing 2.0 wt% CuS@MXene reduced the average coefficient of friction by 56.1% and the wear volume by 83.9%, while enhancing the load-carrying capacity by two times. The lubrication mechanism of CuS@MXene is attributed to the formation of a “hard-soft” synergistic composite tribofilm at the sliding interface; this film leverages the complementary advantages of its components to deliver exceptional lubrication performance. Furthermore, the nanohybrids significantly enhanced the electrical conductivity of the gel, thereby reducing the electrical resistance of the tribofilm. This work provides a novel strategy for developing multifunctional additives with robust lubricating and conductive capabilities to mitigate friction and electrical corrosion in mechanical components.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Yankai Zhang,Chenxi Zhu,Haoyi Wang,Yunbiao Qi,Ping Sun,Quanxing Zhang,Wei Jiang
The chemical recycling of waste poly(L-lactic acid) (PLLA) into its monomer, L-lactide, offers a promising strategy for establishing a circular economy for PLLA-based polymers. However, conventional approaches typically require high reaction temperatures and suffer from significant side reactions, thereby hindering the efficient recycling of waste PLLA. In this study, we present a low-temperature, continuous depolymerization process for waste PLLA, catalyzed by stearyl alcohol (StOH) and stannous octanoate (Sn(Oct) 2 ) at a mild temperature of 165 °C. This system achieves an L-lactide yield of 99.31 % and purity of 98.02 % (ee = 99.73 %). Characterization of the reaction mechanism, supported by density functional theory (DFT) calculations, reveals that StOH displaces the octanoate ligands in Sn(Oct)₂ to form tin(II) octadecyl alkoxide. This nucleophilic species interacts with the carbonyl groups of PLLA, promoting chain scission via ligand-assisted attack. The mechanism reduces the energy barrier for backbiting reactions, thereby enhancing the rate of L-lactide formation. This method exhibits strong practical viability, achieving a 97 % yield from real-world PLLA waste and selectively degrading PLLA in mixed plastic streams to enable efficient separation. Furthermore, a simplified continuous processing system was developed, demonstrating stable and sustained PLLA degradation. This work provides an innovative and scalable strategy for sustainable PLLA chemical recycling under mild conditions.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Haoran Zhou,Luan Wen,Liwu Lin,Zhongrong Li,Minghua Qiu
Pyrethrins is one of the most important botanical insecticides. In recent years, due to the demand for pyrethrins, factories use dried flowers of cultivated pyrethrum as raw materials to produce pyrethrin. During this process, a large amount of wax is produced. In order to avoid resource waste and environmental pollution, better development and utilization of pyrethrum wax is required. Therefore, in this study, refined pyrethrum wax unsaponifiables (RPWU) were prepared from pyrethrum wax wastes by silica gel column chromatography and saponification . The compositions and contents of main components in the RPWU were studied by GC and GC-MS. RPWU contained rich long-chain fatty alcohols , in which eicosanol, docosanol , tetracosanol and hexacosanol were the main components, accounting for 71.3%. In addition, it contained a small amount of odd carbon long-chain fatty alcohols (tricosanol and pentacosanol), accounting for 7.5%, which is very rare in plants. Meanwhile, RPWU showed inhibitory effect on tyrosinase , suggesting that RPWU could have skin-whitening effect. Therefore, RPWU obtained from pyrethrum wax waste has potential bioavailability value, which will promote the development and utilization of pyrethrum wax waste.
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高影响因子
FUEL
·
2022
·
IF 8.035
Xin Zhang,Yiming Zhao,Wenjuan Li,Yun Zhang,Siyu Xu,Sen Xu,Wen Zhou,Yizheng Fu,Yongan Feng,Weiguo Cao
Higher fatty alcohols play a vital position in modern industry, while the dust explosion hazard cannot be ignored. Three kinds of linear monohydric alcohols CH 3 (CH 2 ) n-1 OH (n = 16, 18, 22) were selected to explore the combustion characteristics through ignition tests and molecular dynamics simulations. The experiment consequences indicated that the flame propagation height of alcohols dust gradually aggrandized as the enlargement of dust concentration of 30–750 g/m 3 and the flame propagation velocity presented two peaks. CH 3 (CH 2 ) 15 OH had the highest flame propagation height and velocity, followed by CH 3 (CH 2 ) 17 OH and CH 3 (CH 2 ) 21 OH. The first flame propagation velocities of CH 3 (CH 2 ) 15 OH, CH 3 (CH 2 ) 17 OH, and CH 3 (CH 2 ) 21 OH reached the maximum value at 500 g/m 3 , which were 16.47, 13.25, and 12.53 m/s, respectively. The second peak reached the maximum value at 750 g/m 3 , which were 20.07, 19.05, and 18.23 m/s, respectively. The combustion reactions of alcohols revealed that the decomposition of molecules was first due to the breakage of the C C bond, and the main products were mainly C 2 H 4 , H 2 O, CH 2 O, CO, and CO 2 . The production and consumption reaction processes of C 2 H 4 , CH 2 O, and other combustible gas products reasonably explained the flame continuous process and the variation of flame propagation. The TG test results indicated that the volatility and thermal conductivity of CH 3 (CH 2 ) 15 OH, CH 3 (CH 2 ) 17 OH, and CH 3 (CH 2 ) 21 OH decreased sequentially, which confirmed the flame propagation and molecular dynamics combustion reactions of the three alcohols. The volatility of alcohols was the key factor determining the difference in the flame propagation behavior of alcohols dust.
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CHEMOSPHERE
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2016
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IF 3.698
Yongzhen Wang,Songquan Wu,Xingru Yan,Tao Ma,Lu Shao,Yuyan Liu,Zhanhu Guo
A series of alkyl bicarbamates supramolecular organogelators were synthesized with different structures and lengths of alkyl chains. The driving forces for the self-assembly of small molecules, including the intermolecular H bonding, π-π stacking and van der Waals interactions, played an important role in the formation of different 3D network structures, i.e., fibers, ribbons, sheets, and prisms. And a probable formation process of the gel networks was proposed. Furthermore, the phase-selective gelling performances were investigated for oil removal from aqueous solution. Interestingly, the gelling properties were found to be affected by the length and structure of alkyl chains, while some gelators with intermediate alkyl chain lengths could effectively gel all the tested oils from water surface within 15 min, such as Russian crude oil, diesel , gasoline, soybean oil, peanut oil, olive oil, cyclohexane , hexane and ethyl acetate. Advantageously, fast gelation , high rate of oil removal (>95%) and excellent oil retention rate (close to 100%) were realized in the recovery of oil spills from water surface. This kind of supramolecular gelators demonstrates good potential applications in the delivery or removal of organic pollution from oil/water mixtures.
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PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 91
·88820-88825
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IF 3.289
Liping Li,Qiuxia Zhang,Hong Huo,Jianjun Zhou,Lin Li
Organic gelators of glutamic acid derivative were synthesized, which have been successfully used to gel commercial electrolyte for lithium ion battery. The organic gelators self-assembled to form 3D fibrillar structures with very high porosity in the electrolyte solvent. Thermal stability of the gel electrolyte increased with the length of side chain and concentration of gelators. When the side chain length of gelator was 22 carbons, the gel electrolyte could endure temperature higher than 60 °C with the addition 2 wt% gelator. The most prominent advantage of gel electrolyte over liquid electrolyte was that it could broaden the electrochemical stable window, which has potential application in high voltage lithium ion batteries. With the addition of organic gelator, conductivity of the gel electrolyte would decrease a little, but it still showed the conductivity–temperature behavior of liquid electrolyte. The cells with gel electrolyte showed similar cycling performance as those with liquid electrolyte, which indicated that the organic gelators of glutamic acid derivatives could be used in lithium ion batteries, especially in high voltage lithium ion batteries.
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高影响因子
FOOD CHEMISTRY
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2014
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IF 3.259
Songbai Liu,Yuanqing Fu,Si Nian
Anthocyanins are intriguing natural pigments with beneficial bioactivities and their colour is extremely susceptible to acidity variation. Minimisation of colour fluctuation is essential to maintain quality consistency in food industry. A new strategy employing surfactants to mimic encapsulation was attempted with typical anionic, cationic and nonionic surfactants and proved effective although the traditional copigmentation method was inactive. The exceptional colour fluctuation buffering effect of anionic surfactants especially sodium dodecyl sulphate (SDS) was revealed and then carefully analysed by colorimetric and spectroscopic methods. The outstanding activity of SDS presumably resulted from effective shielding of anthocyanins from external acidity through strong interaction with the positively charged flavylium cations owing to its anionic nature. These results suggest SDS is a valuable additive for buffering colour fluctuation of anthocyanins. The strategy of surfactant will be useful for buffering colour fluctuation of natural colourants.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）