Lubrication Science
·
2017
·Vol. 30
·期 1
·16-22
·
IF 1.414
Zeyun Wang,Wei Wu
Oil-miscible phosphonium-based ionic liquids have recently been attracted much attention. This study is to develop potentional high temperature lubricating greases based on oil-miscible phosphonium-based ionic liquids. This lubricating grease is prepared using oil-IL blend, which was obtained by adding 10wt% oil-miscible phosphonium-based ionic liquids into the PAO 40 base oil as base stock. Compared with the traditional PAO 40 polyurea grease, this polyurea grease has a little lower dropping point. Corrosion test results show the polyurea grease that was prepared using phosphonium-based ionic liquids cations connected with longer alkyl chains that are no corrosion to brass and steel. Most importantly, the polyurea greases demonstrate very promising tribological properties at 150°C, such as low friction coefficient, small wear volume, and high lubrication failure load. Surface characterization revealed the tribochemical film containing iron oxide, and Fe[PO 4 ] was formed on the worn surface.
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Lubrication Science
·
2024
·Vol. 36
·期 6
·468-477
·
IF 1.8
Han Yu,Min Li,Jianfang Sun,Jingying Su,Fenghua Su
As an emerging two-dimensional material, black phosphorus (BP) has excellent tribological properties, but the poor dispersion of BP in oil inhibits its application in friction to some extent. Surface modification is one of the effective methods to solve the dispersibility of BP, and the use of nano-Fe 3 O 4 dotted on the surface of BP improves the dispersion stability of BP in soybean from 3 days to about 15 days. Compared with pure soybean oil, friction coefficient and wear rate of the addition of 0.12 wt% BP/Fe 3 O 4 are reduced 65% and 78%, respectively. To elucidate the excellent tribological mechanisms of BP/Fe 3 O 4 as additives in soybean oil, the compositional and structural characterisation of the abrasion mark surface was studied accordingly. On the one hand, soybean oil reacts with BP/Fe 3 O 4 to form a composite tribo-film during the scraping process. This tribo-film composed of amorphous carbon, iron oxide and phosphorus oxide nitrides prevents direct contact between the sliding interfaces. On the other hand, BP and Fe 3 O 4 nanoparticles form a mechanical rollerball structure, which can further reduce interfacial friction and wear through synergistic lubrication. The results provide new insights into the design of additives in biomass lubricating oils and propose new application prospects for BP in the field of lubricating additives.
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Lubrication Science
·
2024
·
IF 1.8
Cong Liu,Yanguo Yin,Rongrong Li,Haoping Wang,Liang Li
A strategy involving the use the rare-earth compound LaF 3 with good lubrication and stability properties as a filler in the preparation of Cu-based composites was proposed to solve the problem of poor wear resistance in Pb-free Cu-Bi materials. The influence and regulatory mechanism of LaF 3 content on the mechanical and tribological properties of these composites were studied. The results indicate that LaF 3 has a good refining effect on Cu alloy grains, and LaF 3 and Bi are distributed in a network along the grain boundaries of the Cu alloy in the material. As the LaF 3 content increases, the mechanical properties and friction coefficient of the composite gradually decrease, and the wear rate first declines and then increases. The wear resistance of Cu-Bi composite containing LaF 3 mainly depends on the mechanical support provided by the matrix. When the LaF 3 content is higher than 6%, the composite strength is extremely low, and the increase in lubricant content at the friction interface does not play a decisive role in the material wear behaviour. The material wear rate increases with the increase in LaF 3 content. Therefore, using 6% LaF 3 is recommended to improve the wear resistance of the material and maintain a balance among its mechanical properties, antifriction and wear resistance.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Changning Hu,Jie He,Tianyou Zhu,Yubin Chen,Yinjie Peng
Conductive hydrogels possess excellent flexibility and tunable conductivity, making them promising materials for flexible strain sensor and triboelectric nanogenerator (TENG). However, conventional conductive hydrogels suffer from low mechanical strength, toxic crosslinkers, and poor recyclability. In this study, a lignosulfonate (LS)-Fe 3 + autocatalytic system was utilized to rapidly initiate the polymerization of polyacrylic acid (PAA). In addition, carboxymethyl cellulose (CMC) was incorporated to reinforce mechanical strength, while ethylene glycol (EG) was introduced to improve antifreezing and moisturizing properties. The resulting PCL-EG hydrogel was employed to fabricate flexible strain sensor and triboelectric nanogenerator. This hydrogel exhibits outstanding adhesion, self-healing ability, and recyclability. The PCL-EG hydrogel-based strain sensor exhibits a wide detection range and high sensitivity (GF = 13.3 at 300–500 % strain), enabling reliable monitoring of human motion across multiple body regions. Furthermore, TENG assembled with the PCL-EG hydrogel generate stable electrical output, sufficient to power small wearable electronics and support self-powered signal transmission. This work offers valuable insights and guidance for the development of multifunctional flexible electronic devices.
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EUROPEAN JOURNAL OF DRUG METABOLISM AND PHARMACOKINETICS
·
2018
·Vol. 44
·期 2
·251-259
·
IF 1.362
Qing Lin-Sen,Chen Ting-Bo,Sun Wen-Xia,Chen Li,Luo Pei,Zhang Zhi-Feng,Ding Li-Sheng
Background and Objectives Astragaloside IV (AGS IV) is the most important bioactive constituent of Radix Astragali. However, its disappointing clinical application is mainly caused by its very low solubility in biologic fluids, resulting in poor bioavailability after oral administration. We recently obtained a novel water-soluble derivative of AGS IV (astragalosidic acid, LS-102) that displayed significant cardioprotective potential against hypoxia-induced injury. The objective of this study was to investigate the intestinal absorption, main pharmacokinetic parameters and acute toxicity of LS-102 in rodents compared with AGS IV. Methods An oral dose of LS-102 and AGS IV (20 mg/kg) was administered to Sprague-Dawley (SD) rats, and blood samples were collected at predetermined time points. The plasma concentrations were detected by a validated UHPLC-MS/MS method, and pharmacokinetic parameters were calculated using a compartmental model. In the intestinal permeability study, the transport of LS-102 across Caco-2 cell monolayers was investigated at six concentrations from 6.25 to 250 µM. Moreover, the acute toxicity of LS-102 (40–5000 mg/kg) via a single oral administration was investigated in BALB/c mice. Results LS-102 was rapidly absorbed, attaining a maximum concentration of 248.7 ± 22.0 ng/ml at 1.0 ± 0.5 h after oral administration. The relative bioavailability of LS-102 was twice that of AGS IV. LS-102 had a P app (mean) of 15.72–25.50 × 10 −6 cm/s, which was almost 500-fold higher than that of AGS IV, showing that LS-102 had better transepithelial permeability and could be better absorbed in the intestinal tract. The acute toxicity study showed no abnormal changes or mortality in mice treated with LS-102 even at the single high dose of 5000 mg/kg body weight. Conclusions Oral LS-102 produced a pharmacokinetic profile different from AGS IV with higher bioavailability, while the toxic tolerance was similar to previous estimates. Thus, we speculated that LS-102 might provide better clinical efficacy and be a potential candidate for the new drug development of Radix Astragali.
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PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 61
·期 20
·2475-2485
·
IF 3.4
Yi Wang,Yu Miao,Yuxin Cai,Enfu Wang,YiPeng Liang,Jinhuan Zhong,Wenbiao Zhang,Jingda Huang
Development of water-soluble polymer air filtration materials attracts considerable attentions due to their environmentally friendly performance and high efficiency, but the balance of mechanical strength, efficiency and pressure drop still is a severe challenge. Focusing on this issue, polyvinyl alcohol (PVA), bamboo activated carbon (BAC) and sodium lignosulfonate (Ls) were combined to construct an electrospinning system with two filtration functions. In the PVA@Ls@BAC system, the 3D network constructed by the electrospun PVA based nanofibrous could effectively intercept PM2.5, and the introduced Ls enhanced the mechanical strength of PVA nanofibrous due to its good rigidity. In addition, the added negatively charged BAC facilitated the electrostatic adsorption of PM2.5 while also improved the heat resistance of the system. Moreover, polydimethylsiloxane (PDMS) was introduced to enhance the water resistance of the system. The resulting electrospun PVA@Ls@BAC@PDMS composite nanofibrous air filtration membrane exhibited excellent air filtration performance (98.67%), water repellency (123.7° of WCA), and reusable performance, as well as having good mechanical property and the tensile fracture strain reaching 112%. Because of its good performance and simple preparation process, the electrospun PVA@Ls@BAC@PDMS composite nanofibrous air filtration membrane has great application space. Graphical
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yeqiang Lu,Hui Ma,Hanyue Kang,Zhiling Chen,Lei Qin,Zimo Lou,Lixin Xue
To address the increasingly severe oil spill accidents and water contamination, the development of super-wetting membranes with high oil/water separation efficiency is in great demand but remains challenging. The critical challenge lies in the rational design and fabrication of robust rough surface with hierarchical micro/nano-structure. In this study, biomimetic super-wetting polyacrylonitrile composite membrane was developed through in-situ synthesis and synchronous integration of zeolitic imidazolate framework nanoleaves (ZIF-Ls). Thorough investigation was conducted to assess the effect of the ZIF-Ls growth time on membrane morphology and surface wetting property. Incorporating the nanoleaf-like ZIF-Ls onto the surface of the membrane provided the surface with micro/nano rough structure and superamphiphilic/superlyophobic features. The prepared membrane showed great separation capability toward various O/W and W/O emulsions, and could be easily regenerated by employing a simple rinsing and drying procedure with high separation efficiency sustained even after multiple separation cycles. Moreover, the membrane with ZIF-Ls demonstrated outstanding catalytic performance in the Knoevenagel condensation. This study achieves advancements in the development of super-wettable membranes with outstanding performance in separating emulsions and the as-prepared membranes have the potential to serve as promising candidates for practical oily mixture treatment.
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Magnetochemistry
·
2026
·Vol. 12
·期 7
·74
·
IF 2.8
Bin Chen,Ge Gao,Yuhua Liu,Wei Ding,Hong Li
Conventional water treatment relies on sequential flocculation and disinfection, which inflates infrastructure costs and heightens the risk of disinfection byproduct formation. Here, we report a magnetic lignin-based flocculant (LS-DMC-AM@Fe3O4) that integrates flocculation, sterilization, and rapid magnetic separation within a single material. The composite was synthesized by thermally initiated graft copolymerization of methacryloyloxyethyl trimethylammonium chloride (DMC) and acrylamide (AM) onto sodium lignosulfonate (LS), followed by incorporation of Fe3O4nanoparticles (NPs) at 15 wt% loading; the product exhibited a saturation magnetization of 12.8 emu g−1. LS-DMC-AM@Fe3O4achieved 98.2% kaolin turbidity removal at 1 mg L−1and 98.6%E. coliremoval at 8 mg L−1, and displayed a markedly broader effective dosage window than its non-magnetic analog. We attribute this broadened window to Fe3O4-enhanced membrane disruption, which liberates anionic intracellular contents that buffer excess cationic charge and thereby suppress restabilization. The bactericidal efficiency reached 90% at 18 mg L−1, 1.6-fold higher than LS-DMC-AM, governed by a synergistic dual mechanism: quaternary ammonium contact-killing coupled with Fe3O4NP-induced intracellular reactive oxygen species (ROS) accumulation. Under an external magnetic field, flocs underwent rapid phase separation and displayed enhanced shear-regrowth capacity (E. colifloc recovery factor: 53% vs. 26%); Fe3O4NPs were recovered at >95% efficiency over two cycles. Despite higher unit production costs, LS-DMC-AM@Fe3O4delivers competitive per-unit-volume treatment economics through its ultralow effective dosage and magnetic seed recyclability. These results establish a viable strategy for engineering multifunctional, recyclable flocculants from industrial lignin waste.
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EUROPEAN JOURNAL OF NUTRITION
·
2019
·Vol. 59
·期 6
·2709-2728
·
IF 4.449
Wang Tao,Yan Hong,Lu Yingying,Li Xin,Wang Xin,Shan Yuanyuan,Yi Yanglei,Liu Bianfang,Zhou Yuan,Lü Xin
Purpose The objective of the study was to evaluate the anti-obesity effect of Lactobacillus rhamnosus LS-8 and Lactobacillus crustorum MN047, and illustrate the potential functional mechanism about the alleviation of high fat and high fructose diet (HFFD) induced obesity and related metabolic abnormalities. Methods C57BL/6J mice were subjected to a standard or HFFD with or without supplementation of L. rhamnosus LS-8 and L. crustorum MN047 for 10 weeks. Obesity related metabolic indices including glucose tolerance, insulin resistance, serum lipid, liver function, hormones and inflammatory cytokines were assessed by standard protocols. For the monitoring of inflammatory response and lipid metabolism, transcriptional levels were profiled in liver and/or adipose tissues. Furthermore, gut microbiota composition analyses in the fecal samples were performed using 16S rRNA gene sequencing, and gut microbial metabolites, including lipopolysaccharide (LPS) and short-chain fatty acids (SCFAs), were also tested for the assessment of the relationship between gut microbiota variation and inflammatory response. Results Administration with L. rhamnosus LS-8 and L. crustorum MN047 significantly mitigated body weight gain and insulin resistance, and inflammatory response (TNF-α, IL-1β and IL-6 levels in serum and corresponding mRNA levels in adipose tissues) was significantly inhibited in these two strains-treated mice. Moreover, L. rhamnosus LS-8 and L. crustorum MN047 could partially normalized mRNA expression levels involved in lipid metabolism including Pparγ , Srebp - 1c , CD36 , Fabp2 and FAS . In addition, these two strains manipulated gut microbiota by decreasing the abundance of Bacteroides and Desulfovibrio and increasing that of Lactobacillus and Bifidobacterium , which in turn raised the levels of feces SCFAs and lowered the levels of circulating LPS. Conclusion These results indicated that L. rhamnosus LS-8 and L. crustorum MN047 supplementation possessed the anti-obesity effect on the HFFD fed mice by alleviating inflammatory response and regulating gut microbiota, which further suggested that these two probiotics can be considered as an alternative dietary supplement in combination with the preventive and therapeutic strategies against obesity and related complications. Graphic abstract
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