TRIBOLOGY INTERNATIONAL
·
2024
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IF 6.1
Qingyao Li,Qiang Gao,Wenhao Chen,Wenpeng Wang,Zixiang Wu,Zhuopei Zhang,Youqiang Wang,Yange Feng,Daoai Wang,Feng Zhou
Currently, the conductive grease has problems such as unstable conductivity and large wear volume. This article used an in-situ synthesis method to synthesize a base conductive grease with PAO 10 as base oil, oleic acid and melamine as thickener. The complex conductive grease was further prepared by doping MWCNTs-OH into the base conductive grease. The experiment found that the complex conductive grease's anti-wear and anti-friction properties improved by 72.23% and 27.16%, respectively, with respect to the current-carrying condition. The contact resistance is 27.12% lower than commercially available conductive grease. This method of reducing the contact resistance (ECR) and friction coefficient (COF) of conductive grease through hydrogen bonding shows excellent application prospects in the current-carrying friction direction.
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高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Haoyu Liu,Wei Liu,Yanlin Wang,Hong Yuan
The incorporation of mesopores into zeolite catalysts improves both reactant diffusion and the catalyst lifespan. In this study, a bolaform surfactant, C6H13–N+(CH3)2–C6H12–N+(CH3)2–C6H12–O–C6H4–O–C6H12–N+(CH3)2–C6H12–N+(CH3)2–C6H13 (BAM–6–6–6), was used to guide the synthesis of hierarchical MFI zeolite nanosheets (HMNs). The HMN pore structure and acidic sites were altered by varying the ratio of the K2SO4-derived K+ and Al sources in the initial gel. The X-ray diffraction, Fourier transform infrared spectroscopy, scanning electronic microscopy, and N2 adsorption/desorption were used to characterize these materials. The HMNs each had an interconnected hierarchical pore structure which consisted of MFI and mesoporous structures and mesopore-specific surface areas as high as 353.8 m2 g–1, indicating that the BAM–6–6–6 formed lamellar micelles based on π–π stacking. Temperature-programmed NH3 desorption and 27Al magic angle spinning nuclear magnetic resonance spectroscopy revealed that the intersection cavity of the HMN structure was enriched with acidic sites. Because of the layered HMN structure, which promoted diffusion and increased resistance to carbon deposition and buildup, the catalysts possessed good catalytic activity in cracking oleic acid. For the HMN zeolite, the light-olefin yield reached 50.02% at 500 °C, outweighing that of conventional ZSM-5 (39.80%), and the initial catalytic activity was retained for up to 50 h. Furthermore, for HMN, the hard coke loss (3.8%) was less than that for CZSM-5 (9.7%).
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高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 12
·1-12
·
IF 2.4
Ge Pengyu,Liu Xiyu,Li Xincheng,Fan Mingming,Zhang Pingbo
In this study, highly crystalline ZSM-22 zeolite with a TON topology was synthesized via a seed–template co-assisted hydrothermal method and subsequently modified with low-concentration NH₄Cl to introduce Brønsted acid sites. The characterization of the catalyst revealed its well-defined rod-like crystals (2–5 μm), one-dimensional straight channels (0.46 × 0.57 nm), microporous surface area of 210 m 2 ·g −1 , Brønsted-to-Lewis (B/L) acid ratio of 0.45, and excellent thermal stability. Under optimized reaction conditions (270 °C, 3 h, 6 wt% catalyst), the catalyst achieved a 95.01% conversion of oleic acid and a 77.72% yield of isostearic acid. The confinement effect of the 1D channels effectively suppressed undesired side reactions, offering significantly enhanced selectivity compared to commercial zeolites such as ZSM-5. Thermogravimetric analysis demonstrated that calcination at 550 °C successfully removed coke deposits and restored catalyst activity. After five regeneration cycles, the conversion and yield remained at 89.50% and 72.80%, respectively, with less than 6% loss. These findings provide theoretical and technical guidance for the high-value catalytic transformation of biomass-derived fatty acids. Graphical H-ZSM-22 catalyst with good reusability
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Materials Today Chemistry
·
2026
·
IF 7.4
Zihui Jin,Yuhan Si,ChunYu Yu,YaoYu Liu,Bin Song,QingQuan He,ChaoYu Xiang
The combination of low-temperature nucleation and high-temperature growth increases the size of ZnSeTe quantum dots while reducing Te doping, leading to a narrower full width at half maximum of the core emission. • In-situ coating of a thin ZnSe passivation layer on the ZnSeTe core narrows its emission linewidth, suppresses Te oxidation during purification, mitigates non-radiative recombination, and thereby enhances both chemical stability and optical performance. • QLEDs employing these quantum dots as the emissive layer exhibited an electroluminescence peak at 462 nm with a FWHM of 25 nm and achieved a maximum external quantum efficiency (EQE) of 12.69%. ZnSeTe quantum dots (QDs) represent a promising class of cadmium-free emitters for pure-blue quantum dot light-emitting diodes (QLEDs) in next-generation high-definition displays. However, efficient blue emission typically requires high tellurium (Te) doping, which induces oxidation, generates surface defects, and broadens the emission spectrum, thereby limiting device efficiency and scalability. To overcome this challenge, we precisely tune the molar ratio of zinc to oleic acid (OA) in the precursor to achieve controlled enlargement of the ZnSeTe cores while simultaneously lowering the Te content, effectively narrowing the full width at half maximum (FWHM) with red shift of the emission peak. Furthermore, to counteract Te's sensitivity to oxygen and moisture, an in-situ ZnSe shell is grown via a one-pot synthesis. This shell suppresses Te oxidation during purification, reduces non-radiative recombination losses, and enhances both chemical stability and photoluminescence. After further coating with ZnSe and ZnS shells, the resulting QDs exhibit a pure blue emission peak at 459 nm with a FWHM narrowed to 23 nm and a photoluminescence quantum yield (PLQY) of 50%. Blue QLEDs based on these QDs achieve an improved maximum external quantum efficiency (EQE) of 12.69. This work demonstrates that the synergistic integration of OA-mediated size regulation and core/shell interface engineering offers a viable pathway toward high-performance, cadmium- and lead-free blue QDs for efficient QLEDs. Download: Download high-res image (191KB) Download: Download full-size image
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FUEL
·
2022
·
IF 8.035
Xicheng Bao,Yaowen Xing,Qinshan Liu,Jincheng Liu,Shiqi Dai,Xiahui Gui,Jihui Li,Zili Yang
Polar and compound collectors are current research hotspots in the field of low-rank coal (LRC) flotation. However, most studies only focus on the collecting ability of collectors while ignoring its selectivity. This study presents the design for a novel high-efficiency ternary compound collector (oleic acid (OA), methyl oleate (MO) and diesel) with great selectivity, strong collecting and spreading ability for Sujiagou LRC. In comparison to diesel, the clean coal yield is increased by 41.40%, and its ash content is reduced by 0.91% at optimal dosage of 2000 g/t. And we propose some new insights on the mechanism of ternary compound collector through density functional theory (DFT) calculations, focused beam reflectance measurement (FBRM), and molecular dynamics (MD) simulations. OA has the strongest collecting ability with the shortest adsorption distance and smallest frontier orbital gap, which ensures the flotation efficiency and collecting ability of ternary compound collector. The great selectivity of ternary compound collector owing to these two reasons: MO adsorbs more strongly on the LRC surface through the flat-lying adsorption at the junction of hydrophilic and hydrophobic parts; the “wasteful adsorption” on the gangue surface is prevented as the nonpolar parts of ternary compound collector attract polar collectors. Finally, a firm oil film with strong spreading ability is formed on the LRC surface, which can achieve a spread across the hydrophilic area even without the adsorption of polar collectors. The synergistic adsorption not only improves the collecting ability of the ternary compound collector but also ensures its selectivity.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Liuqun Fan,Zhiyan Hou,Tianbao Liu,Xiangjing Liang,Andrei Ivanets,Kongjun Ma,Xintai Su
Heteroatom-doped carbon materials derived from oil-bearing sludge exhibit excellent supercapacitor performance due to their unique electronic and chemical properties. However, the complex composition of heteroatoms in oil-bearing sludge makes it difficult to achieve sufficient and directional doping by direct pyrolysis . In this paper, an oleic acid pretreatment-roasting-secondary activation strategy was developed to make full use of hydrocarbons, iron- and nitrogen-containing compounds in oil-bearing sludge to prepare Fe-N X -C materials with excellent electrochemical properties. Characterization results such as transmission electron microscopy (TEM) and N 2 adsorption analysis showed that the best sample had a hierarchical pore structure and uniform Fe and N element loading. X-ray photoelectron spectroscopy (XPS) analysis found that the addition of oleic acid can promote the formation of Fe-Nx, and the dosage of oleic acid will affect the content of Fe-Nx in the carbon materials. Electrochemical characterization of this supercapacitor material was conducted. The best sample's specific capacitance was as high as 293.6 F g −1 at the current density of 0.5 A g −1 , and the capacitance retention rate could still reach 71.5% at the current density of 10 A g −1 . The assembled button-type symmetrical supercapacitors had an energy density of 8.68 Wh kg −1 and a power density of 137.53 W kg −1 , which is much higher than those of most other waste-based carbon materials. This work presents a new idea for the preparation of heteroatom doped carbon materials with excellent capacitive properties from oily sludge, which provides a new reference for the treatment and resource utilization of oily sludge.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 4.446
Changliu He,Zhao Guo,Zhenkun Deng,Shuai Li,Xu Zhang
Chemical oil esters synthesized by polyols and fatty acids are biodegradable and have ideal physicochemical and lubricating properties as compared to mineral lubricants. Using sulfuric acid and lipases as catalysts, a polyester lubricant was synthesized from pelargonic acid (PA) and trimethylolpropane (TMP). Lipase-catalyzed goods are superior and more in accordance with green production requirements. The optimized reaction conditions of lipase catalytic were 50 °C, 15%wt enzyme content, PA: TMP= 3.3:1 %, and 15 % water content. When the time reached 96 h, the accumulation of trimethylolpropane (TMPTP) reached 82% under these conditions. The TMPTP purified by molecular distillation has a flashpoint of 276 °C, a pour point of − 57 °C, and a viscosity index of 145, making it more suitable for extreme environments. On this basis, to improve the viscosity-temperature performance of the substrate, a certain proportion of oleic acid (OA) is added. Low viscosity (kinematic viscosity of 4.86–9.54 mm 2 /s at 100 °C), high viscosity index (VI > 160), low pour point (−50 °C), and low friction coefficient (COF) of 0.09 ∼ 0.11 is among the properties of a series of synthetic hetero-chain mixed esters, which can meet the needs of a variety of extremely low temperatures and complex working conditions.
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高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Yang Yang,Zifan Song,Weiguo Qi,Ningning Zhang,Ying Gao,Jin Liang,Ao Zhang,Yimin Song
To develop a natural polysaccharide targeted nanomicelles drug delivery system loaded with the broad-spectrum anti-tumor drug adriamycin (ADM), FA-LNT-OA polymer was synthesized, the ADM/FA-LNT-OA polymer nanomicelles was prepared, and response surface approach was used to optimize the drug loading procedure of the ADM/FA-LNT-OA nanomicelles. Under the optimum conditions, the drug loading ratio was 14.36 ± 0.12% while the entrapment efficiency was 95.17 ± 0.13%. The drug-loaded micelles were spherical, with the size about 170 nm, and the size distribution was uniform. The CMC of ADM/FA-LNT-OA nanomicelles was 48 ± 0.46 μg/mL, their release was more sensitive to pH than that of ADM, and they had good stability. The FA-LNT-OA nanomicelles had good blood compatibility and cell compatibility. In vitro anti-tumor pharmacodynamic studies proved that the IC 50 of ADM/FA-LNT-OA nanomicelles on Hela, ES-2 and A549 cells were 48.49 ± 0.25, 63.56 ± 0.68 and 105.93 ± 17.03 μg/mL respectively. Moreover, the plasma elimination half-life of ADM/FA-LNT-OA nanomicelles was 5.341 h, the T max was 0.083 h, the CL was 0.017 L/h/kg. Compared with the common ADM formulation, the ADM/FA-LNT-OA nanomicelles prolonged the clearance half-life of ADM, decreased the clearance rate, and extended the retention time of ADM in vivo. In conclusion, the above results laid the foundation for the increase of therapeutic effects and reduction of the clinical toxic and side effects of ADM.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 39
·18272-18284
·
IF 3.3
Kai Zhang,Xiangyi Liu,Jiajun Bi,Amal BaQais,Ben Bin Xu,Mohammed A. Amin,Ying Hou,Xianglong Liu,Handong Li,Hassan Algadi,Juan Xu,Zhanhu Guo
Bimetallic NiCe/Lay catalysts were prepared using an impregnation method with a Lay molecular sieve as a carrier, and oleic acid (OA) as a model compound of unsaturated fatty acid for catalytic pyrolysis to prepare bio-airline fuel. Based on the reaction products, the reaction pathways of the products under the bimetallic NiCe/Lay catalyst were deduced. The bimetals were dispersed uniformly on the support Lay, and the catalyst retained the structure of the molecular sieve after loading and had good physical properties such as specific surface area and pore space. Under optimal conditions (pyrolysis/catalytic temperature = 500/500 °C, catalyst loading = 1.0 g, feedstock injection volume =0.5 mL min−1, and OA to methanol ratio = 1 : 5), 100% conversion, 92.77% hydrocarbon yield, and 75.06% hydrocarbon yield in the range of 8–17 carbon atoms were obtained over the Ni–3Ce/Lay catalyst. This study provides highly efficient catalysts for upcycling oleic acid and methanol for producing fuel.
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BIOMEDICINE & PHARMACOTHERAPY
·
2018
·
IF 3.457
Qingqing Yu,Yayun Liu,Yufei Wu,Yong Chen
Aims Curcumin is a polyphenol compound with many pharmacological activities including antioxidant, lipid-loweing and liver protective. Dihydrocurcumin (DHC) is one of the major metabolites of curcumin. So far, the pharmacological activity of DHC has not been reported. Here, we evaluate the effects of DHC on oleic acid (OA)-induced lipid accumulation, oxidative stress and insulin resistance and the underlying mechanism in L02 and HepG2 cells. Main methods OA-induced L02 and HepG2 cells were used as the in vitro model of nonalcoholic fatty liver disease (NAFLD). Lipid accumulation, oxidative stress, glucose uptake and cell inflammation were evaluated by cellular biochemical assay, respectively. Signaling pathways involved in lipid metabolism including peroxisome proliferator activated receptor-α (PPARα), the sterol regulatory element binding protein-1C (SREBP-1C) and patatin-like phospholipase domain containing 3 (PNPLA3), glucose uptake including phosphatidylinositol 3-kinase (PI3K) and phosphorylated serine-threonine protein kinase (pAKT), and oxidative stress including nuclear factor E2-related factor 2 (Nrf2), cytochrome P450 4A (CYP4A) and 2E1 (CYP2E1) were investigated by western blotting and RT-qPCR, respectively. Key findings DHC decreased the levels of cellular triglycerides (TG) by regulating the mRNA and protein expression levels of SREBP-1C , PNPLA3 and PPARα . At the same time, DHC improved the hepatocellular glucose uptake by increasing the protein expression levels of pAKT and PI3K. Furthermore, DHC reduced the levels of cellular NO and ROS via Nrf2 signaling pathways. Significance The present study firstly revealed that DHC ameliorated OA-induced steatosis through regulating the lipid metabolism, oxidative stress and insulin resistance in HepG2 and L02 cells.
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PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Minxin Wang,Xiang Shi,Ke Wang,Hong Yuan
Standard alumina has only a small number of mesopores, which is not conducive to the mass transfer of biomacromolecules and so affects the catalytic activity in the case that this material is used as a catalyst substrate. In the present work, hierarchical nanostructured γ-Al2O3 (HNCγ-Al2O3) assembled from nanosheets was obtained after high-temperature calcination and a low-temperature hydrothermal treatment of an Al-MOF precursor. This material had a high Brunauer–Emmett–Teller (BET) surface area (266.8 cm3/g) and pore volume (0.64 cm3/g) together with abundant mesopores. Both monometallic and bimetallic Pt/Ni catalysts were prepared using HNCγ-Al2O3 as a carrier and applied to the decarboxylation of oleic acid to produce C8–C17 alkanes. Compared with monometallic materials, the introduction of a second metal increased the quantity and strength of acidic sites on the catalyst. A synergistic effect obtained by incorporating Pt and Ni in the bimetallic catalysts increased the number of oxygen vacancies in the materials and lowered the temperature required to reduce NiOx. At 340 °C, Pt–Ni/Al-1:3 catalyzed the decarboxylation reaction of oleic acid, giving a yield of the product C8–C17 alkanes of 85.3% after a 4 h reaction.
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JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Yuan Wang,Haibo Rong,Benzhen Li,Lidan Xing,Xiaoping Li,Weishan Li
Ultrafine Li 4 Ti 5 O 12 /C composite is synthesized by microemulsion with oleic acid as carbon precursor and particle size controller. The as-prepared sample is characterized with X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), thermogravimetry analysis (TGA) and nitrogen absorption–desorption isotherms, and its performance as anode of lithium ion battery is determined with charge–discharge test and electrochemical impedance spectroscopy (EIS). The characterizations show that the as-prepared sample is composed of ultrafine Li 4 Ti 5 O 12 particles with average size of 25 nm, which are uniformly dispersed in carbon matrix with a carbon content as low as 2.69 wt%. Charge–discharge test indicates that the as-prepared sample exhibits excellent rate performance and cycling stability. At 10C, the highest discharge capacity reaches 136.3 mAh g −1 and the capacity retention is 96.4% after 100 cycles. The improved performance of the Li 4 Ti 5 O 12 /C composite is attributed to the ultrafine particle size and the uniform composite of Li 4 Ti 5 O 12 with carbon.
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危险品化学品经营许可证（带存储）