Scientific Reports
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2022
·Vol. 12
·期 1
·1-12
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IF 4.996
Zhu Xinhe,Fu Jingguo,Ma Dengqing,Ma Chunsheng,Fu Yunyang,Zhang Zhuokai
A composite ceramic coating containing h-BN particles was prepared on the ZL109 alloy via plasma electrolytic oxidation. The h-BN particles were modified by Polyethylene glycol to improve the dispersibility. The results revealed that the h-BN particles in the electrolyte were inertly incorporated into the coating. Meanwhile, the incorporation of h-BN particles can reduce the porosity and slightly increase the roughness of the composite ceramic coating. Furthermore, the growth rate of the coating and the conversion of γ-Al 2 O 3 and α-Al 2 O 3 were promoted by the incorporation of h-BN particles via the change of the current. In addition, due to the presence of h-BN particles, the composite ceramic coating had a lower friction coefficient and a lower wear rate under dry sliding condition.
研究领域:
材料科学
·
表面工程
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Surfaces and Interfaces
·
2022
·
IF 6.137
Weiquan Li,Die Hu,Ke Yin,Chenglong Yu,Bichun Huang
A series of hierarchical Ru-Ce/H-ZSM-5 were designed and synthesized using the sol-gel method, and they were applied as catalysts for the catalytic combustion of chlorobenzene. The pore diameter of the catalyst was adjusted using an amount of sodium alginate (SA). Among all of the catalysts synthesized, the 0.8 wt.%Ru-10 wt.%Ce/H-ZSM-5 catalyst with a crystallization recipe of 1SiO 2 : 0.02Al 2 O 3 : 0.15TPAOH: 0.04SA: 40H 2 O (named RCZA-0.04) exhibited the optimal catalytic activity, with the 90% conversion of chlorobenzene at 247 °C. In addition, the RCZA-0.04 catalyst maintained superb stability during a long-term reaction at 325 °C. The results of characterizations demonstrated that RCZA-0.04 possessed the largest mesoporous volume, which reduced the diffusion resistance of chlorobenzene and increased the dispersion of the active components, thereby enhancing the catalytic activities. Moreover, the RCZA-0.04 catalyst possessed a low Brønsted/Lewis ratio, which was conducive to the adsorption of chlorobenzene and the cleavage of the C Cl bond.
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Nanoscale Advances
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2023
·Vol. 5
·期 3
·711-724
·
IF 4.7
Chengcheng Jiao,Tao Cai,Huanyi Chen,Xinxin Ruan,Yandong Wang,Ping Gong,Hua Li,Rob Atkin,Feng Yang,Haichao Zhao,Kazuhito Nishimura,Nan Jiang,Jinhong Yu
Nano-filler reinforced polymer-based composites have attracted extensive attention in tribology; however, to date, it is still challenging to construct a favorable lubricating system with excellent compatibility, lubricity and durability using nano-filler reinforced polymer-based composites. Herein, sulfonated boron nitride nano-sheets (h-BN@PSDA) are prepared and used as nano-fillers for epoxy resins (EPs), to improve friction and wear along with thermal conductivity. Furthermore, inspired by the lubricating principle and structure of snail mucus, a solvent-free carbon dot-based nanofluid (F-CDs) is fabricated and used for the first time as the lubricant for h-BN@PSDA/EPs. Both poly (4-styrene sulfonate) and polyether amine grafted on the surface of F-CDs contribute to branched structures and multiple interfacial absorption effects. Extraordinarily low friction and wear are detected after long-term sliding. The average coefficient of friction and wear rate of h-BN@PSDA/EPs composites are reduced by 95.25% and 99.42% respectively, in the presence of the F-CD nanofluid, compared to that of EPs. Besides, the added h-BN nano-sheets increase the thermal conductivity (TC) of EPs from 0.178 to 0.194 W (m−1 K−1). The distinguished lubrication performances are likely due to the formation of a hybrid nanostructure of 0D F-CDs and 2D h-BN@PSDA together with the “rolling–sliding” and “self-mending” effects of added F-CDs.
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BIOMEDICINE & PHARMACOTHERAPY
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2022
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IF 7.419
Xingzhuo Song,Yu Du,Cen Liu,Wei Wang,Jing Han,Xinlou Chai,Yonggang Liu
Oxidative stress disrupts the homeostasis of the redox state in cells and induces apoptosis. Prolonged oxidative stress can impair the normal function of cells, tissues, and organs and lead to the development of several diseases. H-2 was synthesized by derivatising N- Alkylamides (NAAs) from Anacyclus pyrethrum (L.) DC, which is commonly used in the treatment of vitiligo in Uyghurs. The antioxidant activity and potential molecular mechanisms of H-2 were investigated using Caenorhabditis elegans ( C. elegans ) and mouse melanoma cell B16-F10 models. The in vivo anti-vitiligo activity of H-2 was studied using C57BL/6 mice. The results showed that H-2 could increase the survival time of nematodes under oxidative stress, promote the nuclear localization of DAF-16, and enhance the expression of Superoxide Dismutase 3 (SOD-3) in nematodes thereby activating the antioxidant enzyme system. H-2 could affect the survival rate of age-1 and akt-1 mutants under oxidative stress. H-2 could reverse the oxidative stress damage by reducing the reactive oxygen species (ROS) content in the Hydrogen peroxide (H 2 O 2 ) -induced oxidative stress damage model of mouse melanoma cells B16-F10. In addition, it was also able to increase the number of melanocytes in the hair follicles of vitiligo model mice and improve the phenomenon of skin damage in mice. In conclusion, our findings suggest that H-2 can alleviate oxidative stress damage in C. elegans and B16-F10, which may be associated with oxidative stress, suppression of antioxidant defences, and transcription factors DAF-16/FOXO, providing beneficial evidence for the application of H-2 in the vitiligo treatment.
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MRS Communications
·
2023
·Vol. 13
·期 2
·268-275
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IF 1.9
Qiao Xinfeng,Hu Chuanlin,Yao Shun,Wang Fazhou
This study is to explore the micro-mechanical properties of C–S–H modified by various carbon nanotubes and the correlation with the nano/micro-structures. The results show that carboxyl-functionalized single-walled carbon nanotubes provide the great template for the growth of C–S–H and reduce the porosity and surface defects of C–S–H particles. The highly ordered and dense layered structure of C–S–H greatly improves its micro-mechanical properties. In addition, the functional groups (–COOH) of functionalized carbon nanotubes can combine with the Ca–O bond of C–S–H to change the interlayer spacing of C–S–H, and the effects are particularly significant at low Ca/Si. Graphical abstract
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ENVIRONMENTAL POLLUTION
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2022
·
IF 9.988
Jijie Kong,Xiaoyu Cao,Wen Huang,Chao Li,Qiming Xian,Shaogui Yang,Shiyin Li,Cheng Sun,Huan He
The occurrence of nitrated polycyclic aromatic hydrocarbons (NPAHs) in sediments has been widely reported, but research on NPAH bioavailability is lacking. In this study, a self-made zeolite imidazolate framework-8/hexagonal boron nitride (ZIF-8/h-BN) solid-phase microextraction (SPME) fiber and commercial Tenax are compared as efficient tools to predict the bioavailability of NPAHs in sediments with bioassays using Cipangopaludina chinensis . During the process of SPME, the NPAH concentrations on the ZIF-8/h-BN fibers reached extraction equilibrium after 72 h. The fiber extraction of NPAHs in sediments was well-fitted by the pseudo first-order kinetic model with a rate constant of 2 × 10 −2 h −1 (R 2 > 0.98). The extraction rates ranking of NPAHs in sediments was 2-nitrobiphenyl>1-nitropyrene>5-nitroacenaphthene>2-nitrofluorene. Compared with SPME, NPAH concentrations reached equilibrium after 168 h for the Tenax extraction. The orders of magnitude of fast, slow, and very slow desorption rate constants were 10 −1 , 10 −2 , and 10 −4 , respectively. At extraction equilibrium (168 h), the SPME was close to the bioavailability of the NPAHs in sediments to Cipangopaludina chinensis with a slope statistically approximated to one. In addition, the linear regression for SPME (R 2 = 0.7285) was slightly higher than that of the Tenax extraction (R 2 = 0.7168) over a short time (6 h). This could be because the coating material of ZIF-8/h-BN can rapidly adsorb freely dissolved NPAHs, and the SPME fibers can accurately predict the bioaccumulated concentrations of NPAHs in exposed organisms by measuring the concentration of NPAHs in the pore water of sediment. This study provides a time-saving and easy procedure to predict the bioavailability of NPAHs in sediments.
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ACS Omega
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2022
·
IF 4.132
Guang Yang,Lei Deng,Xiaofeng Luo,Qibin Liu
Alpha-hemihydrate phosphogypsum (α-HPG) is a cementitious material obtained by dehydration of phosphogypsum (PG), a byproduct of phosphoric acid production. Poor water resistance of α-HPG has usually restricted its application in construction materials. In this study, hydroxy-terminated polydimethylsiloxane (H-PDMS) and Portland cement (PC) were used for the hydrophobic modification of α-HPG. The fluidity, setting times, compressive strength, flexural strength, ratio of compressive to flexural strength, water absorption rate, softening coefficient, pore structure, chemical information, and microstructure of the samples were measured to evaluate the modification effect of H-PDMS and PC. The results showed that H-PDMS and PC significantly improved waterproof properties of α-HPG and reduced its porosity, total pore area, and pore diameter. Specifically, PC provided the reactive group −OH that reacted with H-PDMS. Also, due to the coverage of hydrophobic −CH3 groups, PG was given an overall hydrophobicity with a contact angle of 134° (1.5% H-PDMS). H-HPG (H-PDMS- and PC-modified α-HPG) hydrophobic material can be used in building materials with waterproof requirements and achieve the comprehensive utilization of solid waste PG.
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PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Shan Wan,Huikai Chen,Guangyi Cai,Bokai Liao,Xingpeng Guo
The amino-functionalized carbon dots (FCDs) were used as intercalators to exfoliate and modify the boron nitride for obtaining the FCDs/boron nitride nanosheets (BNNS) nanocomposite . The FCDs, BNNS and FCDs/BNNS were respectively dispersed into the waterborne epoxy (WEP) matrix to prepare the corresponding modified WEP coatings on the copper substrate through the spray coating method. Their micro/macro-morphologies, compositions, surface roughness , self-healing and corrosion resistance behaviors were comparatively researched. Electrochemical results and surface morphology observation show that WEP FCDs/BNNS coating possesses the optimal corrosion protection performance after 40 d immersion in 3.5 wt% NaCl solution. And the impedance value (4.97 × 10 5 Ω cm 2 ) of WEP FCDs/BNNS coating is still about an order of magnitude higher than that of pure WEP coating (3.36 × 10 4 Ω cm 2 ). In the WEP FCDs/BNNS coating system, BNNS as physical barrier extend the diffusion path of corrosive species and block inherent defects of the coating, thus slowing down the corrosion rate; FCDs as intercalators strip BNNS enhancing its physical barrier effect. Besides, FCDs can also act as the effective corrosion inhibitors , which could adsorb on the exposed or corroded copper surface and hinder the further corrosion. Their synergistic effects of physical barrier performance from BNNS and self-healing capability from FCDs endow the WEP composite coating with outstanding corrosion resistance.
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Journal of Essential Oil Bearing Plants
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2022
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IF 1.971
Yuanyuan Zhang,Lin Zhang,Yongbin Meng,Yuangang Zu,Feng Han,Xiuhua Zhao
The utilization of natural product resources is significant for economic growth and health care. Herein, Cinnamomum longepaniculatum essential oil (CLEO) was isolated by microwave-assisted hydrodistillation (MAH). The composition of CLEO was determined by gas chromatography/mass spectrometry (GC/MS), and the antibacterial, nematicidal and anxiolytic activities of CLEO were evaluated. GC/MS results revealed that 33 compounds were identified, accounting for 99.87% of the total identified compounds. The major components of CLEO were monoterpenes, including β-myrcene (22.55%), eucalyptol (11.59%), α-pinene (11.56%), terpinen-4-ol (8.63%). Further research found that CLEO can inhibit the growth of Staphylococcus aureus (MIC 7.13 mg/mL, MBC 14.25 mg/mL), Escherichia coli (MIC 14.25 mg/mL, MBC 57 mg/mL), and Pseudomonas aeruginosa (MIC 14.25 mg/mL, MBC 28.50 mg/mL), the zone of inhibition were 17.49 ± 0.51 mm, 13.35 ± 0.27 mm and 15.15 ± 0.31 mm, respectively. CLEO could increase cell membrane permeability and make β-galactosidase, protein and other substances leak from the cell. Importantly, CLEO was first used to kill pine wood nematodes (PWN, Bursaphelenchus xylophilus). It was found that CLEO was toxic to B. xylophilus (LC50=30.81 mg/mL), and PWN treated with CLEO rapidly died and extended. Furthermore, CLEO was used in anxiolytic for the first time. CLEO inhalation can effectively relieve anxiety-like behaviors in open-field test (OFT) and elevated plus-maze test (EPT), and restore neurotransmitters (5-HT, NE, GABA) in brain tissue to normal levels. This study provides a strategy for the industrial production of CLEO and discovers its potential role in food transportation and preservation, forest pest control, and relief of emotional disorders such as anxiety and stress, which are beneficial to health care and economic development and provides a basis for broader application of CLEO.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Mingxuan Fan,Wenxiu Jiang,Lingqian Tang,Mengqi Zhao,Qingrong Cheng,Lu Feng,Hanjun Wu,Zhiquan Pan,Hong Zhou
From the perspective of full utilization of biomass, a clean approach for the production of diosgenin from total saponins in Dioscorea zingiberensis C.H. Wright (DZW) was realized by preliminary separation and extraction. An alcoholysis approach was adopted to obtain diosgenin using a novel magnetic solid acid Fe 3 O 4 @SiO 2 -Pr-S-Pr-SO 3 H Pr = -(CH 2 ) 3 -) as the catalyst. The prepared solid acid has been fully characterized. The single factor methodology was used to optimize the process parameters. The optimum conditions were: 0.50 g Fe 3 O 4 @SiO 2 -Pr-S-Pr-SO 3 H, 6.0 mL ethanol, the reaction temperature 120 ℃, reaction time 7.0 h and the maximum yield of diosgenin was 24.18% which are higher than conventional hydrolysis with 1.5 M sulfuric acid indicating the high catalytic activity of the solid acids. In addition, the solid acid had good reusability. The LC-MS technique was applied to analyze the main steroidal saponins in total saponins and possible mechanisms and pathways of hydrolysis and alcoholysis processes. Alcoholysis by an as-prepared magnetic solid acid is clearly excellent in high efficiency and reusability. It is a promising strategy for the green production of diosgenin through a cleaner approach.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2021
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IF 6.789
Huajing Zhou,Dongxiu Lu,Shangquan Fang,Chang Liu,Yuancai Chen,Yongyou Hu,Qijin Luo
A novel heteroatomic N, P and S co-doped core-shell material (MnFe 3 O 4 @PZS) was synthesized by a simple polycondensation hydro-thermal method, and used as the cathode to cooperate with electron-catalysis to activate persulfate (S 2 O 8 2− ) (E-MnFe 3 O 4 @PZS-PDS) for tetracycline (TTC) degradation. Radical scavenger studies demonstrated that non-radicals including atomic H* and singlet oxygen ( 1 O 2 ) rather than sulfate and hydroxyl radicals were the crucial reactive oxygen species (ROS). Electrochemical analysis indicated that Mn doping could promote electro-catalytic process via diverting pathway from four/two-electron to one-electron to generate non-radical H*/ 1 O 2 at the cathode, including one-electron oxygen reduction reaction (1e-ORR) ( O 2 → 1 O 2 ), and one-electron hydrogen reduction reaction (1e-HRR) ( H 2 O + e − → H ∗ ) , as evidenced by the lowest onset potential (0.072 V) together with electron transfer number (n = 1.65). Besides, the regeneration/reduction of Fe Ⅱ/Ⅲ /Mn Ⅱ/Ⅲ/Ⅳ and persulfate will not cause excessive consumption of electron and chemicals due to that could directly get the electron individually from the cathode and anode , and finally TTC could be completely degraded with low energy consumption (0.655 kWh m −3 ). This study provides new insights into the direct single electron activating PDS to produce non-radical H*/ 1 O 2 via core-shell catalytic MnFe 3 O 4 @PZS, and displays a promising application in wastewater treatment .
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 18
·8045-8053
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IF 3.591
Yaping Zhang,Daofei Lv,Jiayu Chen,Zewei Liu,Chongxiong Duan,Xin Chen,Wenbing Yuan,Hongxia Xi,Qibin Xia
The separation of ethylene/ethane mixtures using energy-efficient technologies is important but challenging. In this study, we prepared a Zr-based metal–organic framework (MOF-545) possessing a high Brunauer–Emmett–Teller (BET) surface area of 2265.4 m2 g−1, and investigated its adsorption performance for ethylene/ethane separation. Isotherm measurements show that MOF-545 exhibits preferential adsorption of ethane over ethylene. The mechanism underlying the selective adsorption of ethane over ethylene was revealed by the calculations of preferential adsorption sites, interaction energies and adsorption density distributions of ethane and ethylene in MOF-545 via the Metropolis Monte Carlo method. Results show that the strong C–H⋯N hydrogen bonding between ethane molecules and porphyrin rings gives rise to the selective adsorption of ethane over ethylene. Thermal, air and cycling stability tests, adsorption selectivity and adsorption enthalpy calculations, and breakthrough experiments comprehensively validate the potential of MOF-545 as an efficient ethane-selective adsorbent for ethane/ethylene separation.
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