SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Nuannuan Wang,Mengjiao Xu,Changyu Leng,Qingtao Ma,Jiale Wei,Luxiang Wang,Nannan Guo,Lili Ai,Shizhan Feng,Jiaojiao Dai,Xiaoting Xu,Lanlan Zhao
The design of fiber membranes with both ultra-high flux and pH-responsive oil/water separation is challenging but of great significance to environmental protection and human health. In this work, the pH-responsive fiber membranes were prepared by immersing the silica-modified polyacrylonitrile fiber substrates into oleic acid solution. The obtained membranes exhibited highly rough surface structures (Ra = 14.26 µm), large pore sizes (5.35 µm), high porosities (86.04%), and pH-responsive functional groups, respectively. The pH-responsive fiber membranes also had superhydrophobic surfaces and excellent selective separation for oil/water mixtures, for example, a trichloromethane permeation flux of 87,829 L m -2 h - 1 for immiscible oil/water separation, and a water permeation flux of 69,802 L m -2 h - 1 after turning the pH of water from 7 to 13. The above data were much higher than those of stimulus-responsive fiber membranes used for oil/water separation. In addition, the pH-responsive fiber membranes were also used for separating water-in-oil emulsions and oil-in-water emulsions, and achieved the highest separation flux of 15,120 L m -2 h - 1 . This work provides a simple strategy for the preparation of a stimulus responsiveness and high-performance material that can be used in the direction of treating practical oily wastewater.
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Polymers
·
2026
·Vol. 18
·期 16
·1981
·
IF 5.8
Dongmei Xie,Xiaodi Mao,Hongyu Li,Xudong Chen,Yuting Li,Hongzhi Liu
To demonstrate the applicability of the “dynamic self-vulcanization of bifunctional monomers” strategy for toughening polylactic acid (PLA), hydroxylated oleic acid (HOA) was synthesized via UV-initiated thiol–ene click chemistry, using oleic acid as the starting material. In the presence of an excess molar quantity of hexamethylene diisocyanate (HDI), the dynamic self-vulcanization of bifunctional monomers was employed to design PLA blends featuring extraordinary impact toughness. During the one-pot melt compounding, in situ formation and self-crosslinking of flexible poly(urethane-co-amide) (HPUA) toughening phase, together with its reactive compatibilization with the PLA matrix, were simultaneously accomplished. The aggregation of the HPUA domains enabled the morphological transformation of the PLA blend from a sea-island structure to a partially or fully bi-continuous one. At HPUA contents of 20 wt% or higher, the blend exhibited a bi-continuous morphology with a crosslinked HPUA network, attaining a notched impact strength exceeding 110 kJ/m2and an elongation at break above 200%. In particular, when the HPUA content reached 20 wt%, the resulting PLA blend exhibited optimal impact toughness, with a notched IS of 132.1 kJ/m2(30.7 times that of neat PLA). The primary toughening mechanism was determined to be the internal cavitation of the HPUA domains, which subsequently initiates the yielding of the surrounding PLA matrix. This study proposes an applicable and facile method for fabricating polymer materials that possess excellent impact toughness.
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TRIBOLOGY INTERNATIONAL
·
2022
·
IF 5.62
Qianqian Yan,Haojie Ma,Duo Zhang,Ping Wen,Mingjin Fan
Designing novel additives to construct the lubrication film integrating multi-configuration provides a promising solution for developing the lubricants with the excellent tribological performances . Present work prepared the oleic acid-modified graphene oxide/triazine-based covalent-organic frameworks composite (o-GTC) via a two-step solvothermal reaction as a dispersible additive to PAO 10 oil. The XRD , FTIR, Raman and SEM analyses characterized the heterostructure of the o-GTC. Tribological tests reveal that an optimum dose of o-GTC (0.05 wt%) dramatically decreased friction and wear by 50.9% and 92.9% for steel tribopair. The investigation of worn scar uncovered that the firm and tenacious lubrication film integrating the electrical double layer and the heterostructure is formed on the sliding surface, which is responsible for the outstanding tribological performances.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 7
·1753-1761
·
IF 3.146
Wei Zuojun,Cheng Yuran,Chen Mengting,Ye Yuhua,Liu Yingxin
Using nitrogen-doped mesoporous carbon (NMC) as the support, several NiRe bimetallic catalysts with low metal loading of 1 wt% were designed and prepared for the selective deoxygenation of oleic acid to n-heptadecane in the absence of hydrogen. Results showed that the Ni 80 Re 20 /NMC catalyst with a Ni/Re molar ratio of 80: 20 achieved the highest yield of n-heptadecane (92.3%) at 330 °C for 2 h in isopropanol solvent, and at a metal/oleic acid weight ratio of 1: 333. The catalyst can be reused at least five times with slight activity loss. Combined with the results of in-situ XRD, HRTEM, XPS and CO 2 -TPD, the formation of NiRe alloy, the very fine NiRe nanoparticle size at 2.30 nm, as well as the hydrophobic, mesoporous and weakly basic properties of the NMC support surface were demonstrated to contribute to the excellent catalytic performance of the catalyst.
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ACS Omega
·
2022
·
IF 4.132
Maoyan An,Yinfei Liao,Zhe Yang,Yijun Cao,Xiaodong Hao,Xingwei Song,Hourui Ren,Aosheng Yang,Luojian Chen
It has been generally proved that mixed collectors can enhance the flotation of low-rank coal (LRC). However, the inhibition effect of mixed collectors on the detachment between particles and bubbles is still unclear. In this paper, the energy feature of air bubble detachment from the LRC surface in the presence of dodecane (D), oleic acid (OA), and the mixture of dodecane and oleic acid (OA–D) was studied. The effect of collectors on the LRC surface property was analyzed using contact angle measurement, X-ray photoelectron spectroscopy, and wetting heat measurement. The force and displacement during the detachment process were measured synchronously using microforce balance. The results showed that the collector treatment increased the C–C/C–H content and decreased the content of oxygen-containing groups on the LRC surface. The synergistic effect between OA and D enabled the mixed collector to exhibit higher contact angle and wetting heat. Bubble detachment from the LRC surface can be divided into two stages: bubble stretching and bubble sliding, which corresponded to activation energy and detachment work, respectively. The activation energy and detachment work decreased in the same order of OA–D > OA > D, indicating that the mixed collector OA–D increased the energy of bubble detachment from the LRC surface and enhanced the adhesion strength. The theoretical detachment work was calculated, and the calculated results were in agreement with the measured results. This research provides a new perspective on the mechanism of LRC flotation being improved by mixed collectors.
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ULTRASONICS SONOCHEMISTRY
·
2022
·
IF 9.336
Shengnan Wang,Yunjun Liu,Yixiang Liu,Zixin Guo,Jie Li
The simultaneous improvement of quercetin (QUE) processing stability and bioavailability has always presented a technical challenge during food processing. This study constructed a water-soluble carrier consisting of oleic acid (OA) and sodium caseinate (NaCas) in an ultrasonic field and investigated the effect of its encapsulation on improving the thermal stability and bioaccessibility of QUE. The results showed that the OA and NaCas generated uniform, stable water-soluble particles with a poly dispersity index (PDI) below 0.3 and an absolute value of Zeta potential above 30 mV in optimized conditions (a protein concentration of 4 mg/mL, ultrasonic power of 300 W, and ultrasonic time of 5 min). OA-NaCas mass ratio of 1:40, 1:15, 1:8, and 1:4 was selected for QUE loading to compare its encapsulation effect at different mass ratios. Compared with the NaCas without OA, the QUE embedding rate reached 95 % at OA-NaCas mass ratios of 1:15 and 1:8. In addition, the transmission electron microscopy (TEM) images confirmed that QUE was embedded in OA-NaCas particles, forming regular, spherical OA-NaCas-QUE particles at mass ratios or 1:15 and 1:8. Next, when heated at 80 °C for 120 min, the OA-NaCas (OA:NaCas, 1:15, 1:8, and W/W) particles significantly improved the QUE retention rate. The simulated in vitro gastrointestinal digestion experiments showed that the QUE bioaccessibility increased from 25 % to more than 60 % when it was encapsulated in OA-NaCas (OA:NaCas, 1:15, 1:8, and W/W) particles. These results indicated that the OA-NaCas complex was suitable as a hydrophilic delivery carrier of fat-soluble polyphenols.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.701
Zhanglei Zhu,Wanzhong Yin,Bin Yang,Haipeng Li,Wanzhong Guo,Jin Yao
In this investigation, the flotation behavior of coking coal using the mixture of oleic acid (OA) and kerosene as a novel collector was further studied through flotation tests, supplemented with optical microscope analysis, X-ray photoelectron spectroscopy (XPS) analysis, and wet-screening analysis. Flotation results showed that both the flotation recovery and rate constant increased with the increasing proportion of OA in the novel collectors. The improved collectivity can be ascribed to the enhanced aggregation tendency between coal particles with the addition of OA. However, the concentrate ash similarly increased as concentrate yield, and the XPS results showed that the novel collector had relative lower selectivity than kerosene. The potential reason to explain the lower selectivity is that OA affected fine high-ash particles greater than that of the coarse particles.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yucai Lu,Jiuyu Chen,Baozhong Zhu,Jiquan Wang,Cong Jiang,Minggao Xu,Yunlan Sun
Aluminum-containing hydrocarbon fuels cannot fully release their energy due to the poor dispersion and easy agglomeration of aluminum nanoparticles (ANPs). To solve the issues, oleic acid (OA) was used to modify the surface of ANPs, and then Al@OA particles were incorporated into exo-tetrahydrodicyclopentadiene (JP-10) to form Al/JP-10 bi-phase system. Experimental and molecular simulation methods were used to analyze the stability, ignition, and combustion performance of the Al/JP-10 bi-phase system. The results show that at low temperatures, OA can improve the antioxidant and hydrophobic performance of Al@OA particles, which can effectively protect the ANPs from deep oxidation . At high temperatures, OA can accelerate the oxidative exothermic process of ANPs, and the Al@OA particles can shorten the ignition delay time of JP-10 droplets and intensify the combustion. Notably, when the ratio of Al and OA is 10:3 in the Al@OA particles, the Al/JP-10 droplet exhibits the shortest ignition delay.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 25
·5856-5869
·
IF 7
Fei Zhou,Yang Yang,Yuying Liu,Haotian Deng,Jianhua Rong,Jianhao Zhao
Intracellular calcium ions (Ca2+) influence the proliferation–apoptosis balance, and lactic acidosis is an innate feature of a malignant tumor. In this study, a calcium hydroxide/oleic acid/phospholipid nanoparticle [CUR–Ca(OH)2-OA/PL NP] with lipase/pH dual responsive delivery of Ca2+ and curcumin (CUR) was developed for inducing cancer cell apoptosis by a combination of intracellular calcium overload and lactic acidosis elimination. The nanoparticle showed a core–shell structure with some good performance, including an adequate nano-size, negative charge, good blood circulation stability, and non-hemolysis. MDA-MB-231 breast cancer cells exhibited a higher lipase activity than A549 human lung adenocarcinoma cells and L929 mouse fibroblasts by fluorescence analysis. CUR–Ca(OH)2-OA/PL NPs were highly internalized by MDA-MB-231 cells, intracellularly released CUR and Ca2+, triggered the activation of caspase 3 and caspase 9, and caused apoptosis by intracellular calcium overload via a mitochondrial-mediated pathway. Lactic acid of 20 mM inhibited the apoptosis of MDA-MB-231 cells depending on the glucose insufficiency level, but this inhibition could be eliminated by CUR–Ca(OH)2-OA/PL NPs, leading to nearly complete apoptosis. Herein, CUR–Ca(OH)2-OA/PL NPs are a potential killer of cancer cells with high lipase activity by a combination of intracellular calcium overload and lactic acidosis elimination.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Fuxiang Feng,Xiaopo Niu,Li Wang,Xiangwen Zhang,Qingfa Wang
Ni/ZSM-5 nanosheet catalysts with different Si/Al ratios were modified by chemical liquid deposition (CLD) of tetraethoxysilane (TEOS) to tailor their acid spatial distribution. Their catalytic performance was evaluated with the hydroconversion of oleic acid to aviation-fuel-range-alkanes (AFRAs) at different reaction temperatures and H 2 pressures. The modified catalysts inherit the nanosheet structure with decreased external Brønsted acid concentration, especially the strong one. External Brønsted acid sites mainly favor the cracking of the deoxygenated products (C 17 /C 18 ). Internal Brønsted acid sites mainly enhance the isomerization of the linear AFRAs. And the catalytic activity of the external Brønsted acid sites was more sensitive to reaction temperature than that of the internal ones. The deoxygenation and cracking reactions were also more sensitive to H 2 pressure compared to the isomerization reaction. High AFRA selectivity of 51.4% as well as high iso/n -alkanes ratio of 1.7 were achieved at 250 °C and 10 bar over NS200(1).
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SEPARATION SCIENCE AND TECHNOLOGY
·
2017
·
IF 1.106
Ruiqi Liu,Ye Liu,Chunsheng Cheng,Yaling Yang
A novel method based on ionic liquid enhanced magnetic solid-phase extraction (MSPE) coupled with high-performance liquid chromatography (HPLC) for the separation/analysis of phthalate esters (PAEs) in food samples was established. 1-hexyl-3-methylimidazoliu-hexafluorophosphate ([C6MIM][PF6]) was used to coat oleic acid Fe3O4 nanoparticles with core–shell structures to prepare MSPE agents (Fe3O4@OA@IL). The main parameters affecting the extraction efficiency of PAEs were studied. Under the optimal conditions, the calibration curves were linear in the range of 5–5000 ng mL−1 (R2 = 0.9972–0.9998) of four PAEs. The limit of detections (LODs) and relative standard deviations (RSDs, n = 5) of the method were 1.27–2.95 ng mL−1 and 3.9–5.3%, respectively.
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BIOTECHNOLOGY PROGRESS
·
2025
·
IF 2.5
Shumin Zhang,Huimin Huang,Jingwei Zhang,Yuanyuan Zhao,Wen-song Tan,Haibo Cai
Cell culture medium is an important factor affecting the expansion of NK cells in vitro. As an important component of cell culture medium, lipids participate in various complex physiological activities of cells and significantly affect the expansion of cells. Using NK-92 cells as a model, the lipid metabolism of NK cells in vitro was analyzed, and combined with the kinetic relationship between lipid metabolism and NK cell expansion. Four fatty acids, oleic acid, linoleic acid, palmitoleic acid, and α-linolenic acid, were preliminatively identified as the key lipid combinations. The combination was preliminarily verified on the self-developed serum-free medium. It was found that when the key lipid combination was added according to the concentration in the serum, NK-92 cells expansion reached 188.03 ± 33.34-folds, which was significantly higher than 105.28 ± 13.23-folds in the basic medium. Additionally, NK-92 cells expanded by adding key lipid combinations could maintain cell killing function. Overall, this research provides technical support for the development of NK cell serum-free medium.
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