SN Applied Sciences
·
2019
·Vol. 1
·期 3
·1-10
·
IF 0
He Shiwei,Xu Ruidong,Guo Yuqing,Zhao Zhuo,Yu Bohao,Xiao Saijun,Lv Huihong
In this study, β-PbO 2 –Co 3 O 4 composite coatings were synthesized on a substrate using the electrodeposition method in an electrolyte containing Pb 2+ and Co 3 O 4 particles. The preparation process study shows that the β-PbO 2 bath containing Co 3 O 4 particles becomes more stable for an ultrasonic dispersion time within 30 min, with the stability beginning to decrease after the ultrasonic time exceeds 30 min. Co 3 O 4 particles in the β-PbO 2 bath are positively charged, with anions being adsorbed onto the particles. The nucleation behavior study shows that the electric field force plays a dominant role in the adsorption process for the Co 3 O 4 particles. The nucleation and growth of β-PbO 2 on the Co 3 O 4 particles started for the particles closer to the substrate. In addition, the thickness of the β-PbO 2 layer on the Co 3 O 4 particles was inversely proportional to the distance between the Co 3 O 4 particles and the substrate. Compared to the pure PbO 2 electrode, the oxygen evolution overpotentials for the β-PbO 2 –Co 3 O 4 electrode are decreased significantly, which demonstrates an energy-saving effect.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
ARCHIVUM IMMUNOLOGIAE ET THERAPIAE EXPERIMENTALIS
·
2023
·Vol. 71
·期 1
·1-10
·
IF 3.2
Qiao Junying,Guo Shanshan,Huang Xianjie,Zhang Luodan,Li Fan,Fan Yazhen
This study aimed to observe the expression of angiopoietin-2 (Ang-2) in the lung tissue of juvenile SD rats with lipopolysaccharide (LPS)-induced acute lung injury (ALI) and to clarify the role of ulinastatin (UTI). Ninety 18–21-day-old juvenile SD male rats were randomly divided into five groups ( n = 18). ALI rat model was established by intraperitoneal injection of LPS (LPS 10 mg/kg), while the control group was given the same dose of normal saline. The UTI intervention group was given the injection of UTI (5000 U/mL) immediately after the injection of LPS, which was divided into UTI low-dose group (LPS + 5 ml/kg UTI), UTI medium-dose group (LPS + 10 ml/kg UTI), and UTI high-dose group (LPS + 20 ml/kg UTI).The respiratory status of each group of rats was observed, and six rats were randomly selected to be killed in each group at 6, 12, and 24 h, and the lung tissues were dissected and retained. The pathological changes of the lung tissues were observed by hematoxylin–eosin (HE) staining, the expression levels and locations of Ang-2 and vascular endothelial growth factor (VEGF) in lung tissue were observed by immunohistochemical staining, and the expressions of genes and proteins of Ang-2 and VEGF were detected by quantitative reverse transcription polymerase chain reaction (RT-PCR) and Western blot analysis. Three hours after intraperitoneal injection, rats in the model group developed shortness of breath and the developed respiratory distress progressed over time. The lung pathological changes in the model group were obvious compared with those in the control group, and gradually worsened with time, and the pathological changes of lung in the rats in the UTI intervention group were reduced compared with those in the model group. At different time points, the expressions of Ang-2 and VEGF in the lung tissue of rats in the model group were higher than those in the control group, and were lower in the UTI intervention group than those in the model group. The expressions of Ang-2 and VEGF protein were lower in the low-dose group of UTI group than those in the high-dose group of UTI group at different time points ( P < 0.05), and the expressions of Ang-2 and VEGF protein in the low-dose group of UTI were significantly lower than those in the medium-dose group at 12 h and 24 h ( P < 0.05). The expression of Ang-2 was increased in the lung tissue of juvenile SD rats with LPS-induced ALI, and was associated with the degree of lung injury. UTI might attenuate LPS-induced ALI by inhibiting the expression of Ang-2 in lung tissue, and the low dose was more obvious than the medium and high dose.
研究领域:
药理学
·
呼吸病学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2016
·Vol. 19
·期 5
·915-923
·
IF 1.853
Hao Junsheng,Wang Pan,Zhang Yongbin,Zhang Yue
A series of novel pyridinium cationic gemini amphiphiles, 3,3′-(carbonyldiimino)bis (1- n -alkylpyridinium) dibromides, having octyl, decyl, dodecyl, tetradecyl alkyl chains were synthesized. The surface properties and aggregation behavior in aqueous solution were evaluated by surface tension, dynamic light scattering (DLS), and transmission electron microscopy (TEM) measurement. The adsorption at the air/solution interface of all the compounds were quantitative described using the Frumkin model, and the effect of alkyl chain length on surface activity and aggregate behavior was analyzed. It was found that all the gemini amphiphiles possess surface activity and low critical micellization concentration (CMC) values. The values of log CMC depended linearly on the carbon number of the alkyl chains, but the surface tension at the CMC (γ cmc ) showed a minimum for the compound with dodecyl chains. Combinations of DLS and TEM observations showed the existence of vesicles with a broad size distribution in aqueous solution. Meanwhile, vesicles formed below the CMC could be a possible reason for the observed deviation of surface tension curves from the Frumkin model.
研究领域:
化学
·
材料科学
·
界面科学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 12
·2050-2060
·
IF 4.5
Ren Jiahui,He Yongping,Sun Haidong,Zhang Rongzi,Li Juan,Ma Wenbiao,Liu Zhong,Li Jun,Du Xiao,Hao Xiaogang
Reducing the dissolution of Mn from LiMn 2 O 4 (LMO) and enhancing the stability of film electrodes are critical and challenging for Li + ions selective extraction via electrochemically switched ion exchange technology. In this work, we prepared a nitrogen-doped carbon cladding LMO (C-N@LMO) by polymerization of polypyrrole and high-temperature annealing in the N 2 gas to achieve the above purpose. The modified C-N@LMO film electrode exhibited lower Mn dissolution and better cyclic stability than the LMO film electrode. The dissolution ratio of Mn from the C-N@LMO film electrode decreased by 42% compared to the LMO film electrode after 10 cycles. The cladding layer not only acted as a protective layer but also functioned as a conductive shell, accelerating the migration rate of Li + ions. The intercalation equilibrium time of the C-N@LMO film electrode reached within an hour during the extraction of Li + ions, which was 33% less compared to the pure LMO film electrode. Meanwhile, the C-N@LMO film electrode retained evident selectivity toward Li + ions, and the separation factor was 118.38 for Li + toward Mg 2+ in simulated brine. Therefore, the C-N@LMO film electrode would be a promising candidate for the recovery of Li + ions from salt lakes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 312
·期 3
·599-607
·
IF 1.282
Liu Guiqing,Wang Wei,Lin Jianguo,Li Ke,Lv Gaochao,Zhao Xueyu,Wang Shanshan,Luo Shineng,Qiu Ling
16α- 18 F-fluoroestradiol ( 18 F-FES) has been developed as a promising positron emission tomography (PET) imaging agent for targeting estrogen receptor positive (ER + ) breast cancer in the clinical trial. However, the radiosynthesis of 18 F-FES often requires two steps and tough experimental conditions. Therefore, a new estradiol derivative ( 18 F-AmBF 3 -ES) was prepared by an efficient one-step 18 F-radiolabeling method. The tracer was obtained in high yield (~65%) and excellent radiochemical purity (>98%) within 30 min. The uptake rate of 18 F-AmBF 3 -ES in ER + cells was about 3.5% at 30 min. The results suggested that the tracer may be a potential PET imaging agent for ER + breast cancer.
研究领域:
医学影像学
·
肿瘤学
·
核化学
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 16
·期 9
·1-12
·
IF 6.048
Ma Tao,Hui Haiqing,You Xiaofei,Pei Zhiqiang,Tian Miao,Wu Bing
Nanofibre-supported forward osmosis (FO) membranes have gained popularity owing to their low structural parameters and high water flux. However, the nanofibrous membranes are less stable in long-term use, and their fouling behaviours with foulants in both feed solution (FS) and draw solution (DS) is less studied. This study developed a nanofibrous thin-film composite (TFC) FO membrane by designing a tiered dual-layer nanofibrous substrate to enhance membrane stability during long-term usage and cleaning. Various characterisation methods were used to study the effect of the electrospun nanofibre interlayer and drying time, which is the interval after removing the M-phenylenediamine (MPD) solution and before reacting with trimesoyl chloride (TMC) solution, on the intrinsic separation FO performance. The separation performance of the dual-layer nanofibrous FO membranes was examined using model foulants (sodium alginate and bovine serum albumin) in both the FS and DS. The dual-layer nanofibrous substrate was superior to the single-layer nanofibrous substrate and showed a flux of 30.2 L/m 2 /h (LMH) when using 1.5 mol/L NaCl against deionised (DI) water in the active layer facing draw solution (AL-DS) mode. In the fouling test, the water flux was effectively improved without sacrificing the water/solute selectivity under the condition that foulants existed in both the FS and DS. In addition, the dual-layer nanofibrous TFC FO membrane was more robust during the fouling test and cleaning.
研究领域:
材料科学
·
环境工程
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 18
·14711-14721
·
IF 2.779
Feng Dong,Chen Qiduo,Mei Yi,Chen Xinzhi,Zeng Tianbiao
LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) cathode material was usually prepared with Ni 2+ , Co 2+ , Al 3+ co-precipitation method using NaOH/NH 3 ·H 2 O aqueous solution with strictly control of liquid feeding rate and pH value. In this contribution, a facile method was proposed to co-precipitate Ni 2+ , Co 2+ , Al 3+ for synthesizing NCA using (NH 4 ) 2 C 2 O 4 ·2H 2 O as precipitant without control of pH and liquid feeding rate. The impact of reagents (sulfate reagents, nitrate reagents, chloride reagents, acetate reagents) on morphology, micro-structure and final electrochemical performances of NCA were systematically studied. It was suggested that sulfate reagents are suitable for synthesizing NCA. Furthermore, an optimum synthesis route was further selected for mass production. The NCA delivered reversible specific capacity of about 200 mAh g −1 , 191 mAh g −1 , 177 mAh g −1 , 153 mAh g −1 , 132 mAh g −1 , 115 mAh g −1 , 105 mAh g −1 and 94 mAh g −1 at 0.1 C, 0.5 C, 1 C, 2 C, 3 C, 4 C, 5 and 6 C, respectively. Considering the facile and economical synthesis method of precursor, this work can be a footstone for advancing the practical application of NCA cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 15
·44819-44832
·
IF 5.8
Jia Xia,Wang Yunjie,Zhao Jiamin,Gao Yunfeng,Zhang Chunyan,Feng Xiaojuan,Ding Xiaoyi
Global warming and heavy metal-contaminated soils co-occur in natural ecosystems. Flavonoids and phenolic acids in plants have significant antioxidant activity and free radical scavenging ability, which can quickly increase under adverse environments. Arbuscular mycorrhizal fungi (AMF) colonization can affect the synthesis of flavonoids and phenolic acids in host plants. This study focused on the main effect of Glomus mosseae , cadmium (Cd, 8 mg kg −1 dry soils), and elevated temperature (ET, + 3 °C) on main flavonoids and phenolic acids in 120-d Medicago sativa L. (alfalfa). Elevated temperature decreased G. mosseae colonization ratio by 49.5% under Cd exposure. Except for p-hydroxybenzoic acid, flavonoids and phenolic acids content in shoots increased ( p < 0.05) under G. mosseae + Cd relative to Cd only. G. mosseae and Cd showed significant effects on rutin, quercetin, apigenin, liquiritigenin, gallic acid, p-hydroxybenzoic acid, p-coumaric acid, and ferulic acid, and G. mosseae colonization led to increases in these compounds by 41.7%, 35.4%, 32.2%, 267.8%, 84.7%, 33.5%, 102.8%, and 89.4%, respectively, under ET + Cd. Carbon, N, and Cd in alfalfa and G. mosseae colonization rate were significant factors on flavonoids and phenolic acids accumulation. Additionally, P content in shoots significantly influenced flavonoids content. G. mosseae inoculation significantly stimulated the synthesis of main flavonoids and phenolic acids in alfalfa shoots under ET + Cd, which was helpful to understand the regulation of AMF on non-enzyme antioxidant system of plants grown in heavy metal-contaminated soils under global change scenarios.
研究领域:
植物学
·
环境科学
·
生态学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2015
·Vol. 22
·期 3
·1-7
·
IF 1.92
Ji Yanfeng,Kang Wanli,Liu Shuren,Yang Runmei,Fan Haiming
An amphiphilic polymer in water could form an aggregate due to its hydrophobic groups. The rheological properties of the three amphiphilic polymers’ solutions are different because of their different hydrophobic groups. By using a rheometer and a rotatory viscometer, the rheological properties and apparent viscosities of three kinds of amphiphilic polymers have been studied. The results show that all of the polymers are Newtonian fluids at a low shearing rate and pseudoplastic fluids at a high shearing rate. In addition, the amphiphilic polymer-P(AM/BHAM/NaA) has the best thickening behavior and the lowest value of critical aggregation concentration (CAC), which was also verified by fluorescence spectroscopy. By combining creep-recovery with cohesive energy calculation, the structural performance and interaction energy of the aggregate is the reason for the above mentioned phenomenon. By increasing the strength of hydrophobic groups, i.e., with an oil–water partition coefficient, then the structural viscoelasticity of the groups could be improved, and the associate is easily formed in the solution.
研究领域:
高分子化学
·
物理化学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 17
·期 2
·217-225
·
IF 4.803
Xie Jiwei,Liu Guijing,Wang Kaikai,Li Xueming,Bai Yusen,Gao Shanmin,Fan Leqing,Zheng Rundou
Aqueous zinc-ion batteries are attracting considerable attention because of their high safety compared with conventional lithium-ion batteries. Manganese-based materials have been widely developed for zinc-ion batteries cathode owning to their low cost, high security and simple preparation. However, the severe volume expansion and poor stability during charging and discharging limit the further development of manganese-based cathodes. Herein, superior α -MnO 2 @g-C 3 N 4 was successfully prepared for stable zinc-ion batteries (ZIBs) cathode by introducing g-C 3 N 4 nanosheets. Compared with pure α -MnO 2 , α -MnO 2 @g-C 3 N 4 has a specific capacity of 298 mAh·g –1 at 0.1 A·g –1 . Even at 1 A·g –1 , the α -MnO 2 @g-C 3 N 4 still retains 100 mAh·g –1 (83.4% retention after 5000 cycles), implying its excellent cycling stability. The α -MnO 2 @g-C 3 N 4 -based cathode has the highest energy density (563 Wh·kg –1 ) and power energy density (2170 W·kg –1 ). This work provides new avenues for the development of a wider range of cathode materials for ZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 30
·1-10
·
IF 2.8
Wang Sanlong,Wan Jiajia,Tong Huijuan,Yu Yang,Zhang Wenqing,Chen Zhenming,Gui Chengmei,Huang Junjun,Li Honglin
To design and fabricate a novel and low-cost electromagnetic interference shielding material with outstanding performance is becoming extremely popular by scientists over the years, owing to increasingly complex proliferation of electromagnetic waves. In this work, the composite construction that included activation of silver nitrate, electroless copper plating (ECP) and annealing for fabricating weaving structure copper tube was reported to alleviate the problem above. The effect of annealing temperature on its electromagnetic shielding performance was investigated as well. Results manifest the metal particle/ligand structure on weaving cotton surface could promote copper particles to be reduced and deposited on its surface, which can generate weaving copper pipes with face-centered cubic structure spontaneously. The resultant composite, i.e. textured copper tube possessed brilliant shielding effectiveness of 25.2 dB. Interestingly, the electromagnetic shielding performance of annealed ECP cotton was firstly enhanced, and then reduced with the increase of annealing temperature. The 200 °C-annealed ECP cotton exhibited a better shielding effectiveness performance, the values are increased by 38.1% to 34.8 dB, in which the reflection and absorption shielding are increased by 39.9% and 6.7% compared to the one of unannealed sample, corresponding power coefficients of reflection, transmission and absorption were 0.2691, 0.0031, 0.7277, owning to the improvement of Cu tube crystallinity and the introduction of Cu 2 O particles acted as scattering center of electromagnetic waves. Therefore, it would provide a promising future tendency from the viewpoint of abundant resources and sustainable development.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering in China
·
2010
·Vol. 4
·期 2
·187-195
·
IF 0
Chang Qingyun,Zhang Jingwen,Du Xin,Ma Jingjun,Li Jingci
A simple and efficient liquid-phase microextraction (LPME) technique was developed using ultrasound-assisted emulsification solidified floating organic drop microextraction (USAE-SFODME) combined with flame atomic absorption spectrometry, for the extraction and determination of trace copper in water samples. 1-(2-Pyridylazo)-2-naphthol (PAN) was used as chelating agent. Microextraction efficiency factors (including extraction solvent type, extraction volume, time, temperature, and pH), the amount of the chelating agent, and salt effect were investigated and optimized. Under the optimum extraction conditions, figures of merit of the proposed method were evaluated. The calibration graph was linear in the range of 20–600 μg·L −1 with a detection limit of 0.76 μg·L −1 . The relative standard deviation (R.S.D) for ten replicate measurements of 20 and 400 μg·L −1 of copper was 3.83% and 2.65%, respectively. Finally, the proposed method was applied to tap water, river water, and sea water, and accuracy was assessed through the analysis of certified reference water or recovery experiments.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）