JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2022
·Vol. 26
·期 10
·2231-2246
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IF 2.747
Wang Li,Wang Junbo,Yu Aishui,Yu Zuolong
In this paper, removal of malachite green (MG) by two separate processes, namely electrochemical oxidization polymerization and electrochemical reduction precipitation process, was studied. Reaction rate constants ( k 0 ), exchange current density i 0 , the transfer coefficients β and the diffusion coefficient D values were all tested. TR-FTIR (time-resolved Fourier transform infrared spectroscopy), UPLC-MS (ultra-performance liquid chromatography–mass spectrometry), and GC–MS (gas chromatography–mass spectrometer) analyses were applied to investigate the pathway and mechanism of MG degradation. The results show that both electrochemical oxidization polymerization and electrochemical reduction precipitation process were efficient to remove MG.
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NPG Asia Materials
·
2022
·Vol. 14
·期 1
·1-8
·
IF 10.761
Shi Wei,Yao Qin,Donghui Wang,Qu Sanyin,Chen Yanling,Lee Kyu Hyoung,Chen Lidong
Nonferric oxidant precursors have the unique advantage of directly polymerizing poly(3,4-ethylenedioxythiophene) (PEDOT)-inorganic composites. However, due to limited solubility and unmatched oxidation potentials, most oxidants only produce powders or porous materials. To obtain high-quality films with improved homogeneity and controllable particle sizes, the oxidants should be adaptable to high-standard PEDOT film fabrication techniques such as vapor phase polymerization (VPP). In this work, we discovered for the first time a nonferric metal salt suitable for the VPP process. With the addition of an Fe(III) salt to stabilize the reaction and adjust the oxidant ratio, micron-thick antibacterial S-PEDOT-Ag quantum dot (QD) composite films with tunable Ag wt% can be synthesized in one facile step. With a low Ag loading of ~0.2 wt%, the film exhibited an optimized power factor of 63.1 μW/mK 2 , which is among the highest values thus far reported for PEDOT-metal composites. Increase of the Ag(I) concentration in the precursor to a certain level may lead to minor decomposition of the polymer followed by the formation of Ag 2 S particles.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 22
·10444-10456
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IF 4.682
Zhang Tong,Su Huixin,Shi Xiangrong,Li Chengpeng
The rapid development of flexible electronics brings forward more requirements for self-healing substrate materials. Siloxane elastomers as an ideal substrate is widely used in the flexible electronics. However, self-healing siloxane elastomers still need to be improved in terms of mechanical properties. Herein, methacrylate/epoxy groups terminated hyperbranched polysiloxanes (HPBSi) as core was prepared to improve the mechanical properties via providing hierarchical permanent chemical cross-linked networks. A series of room-temperature self-healing siloxane elastomers are constructed by HPBSi with a linear dual-epoxy siloxane monomer through an amino disulfide compound (AFD) with reversible dynamic bonds. Especially, the content of HPBSi and AFD is systematically researched and proved to play a key role in adjusting the mechanical and self-healing properties of the siloxane elastomers. For the P1-5 containing 5 wt% HPBSi, its tensile strength is as high as 0.87 MPa that is improved about 410% compared with an elastomer without HPBSi. P11-5 elastomer with more AFD can obtain the same healing efficiency at room temperature in a shorter time (12 h) compared with 48 h of P1-5 elastomer. Finally, the self-healing siloxane is used as a flexible substrate to fabricate a strain sensor for monitoring multiple human motions, demonstrating a promising potential use in the flexible electronics.
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JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 29
·期 5
·1431-1440
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IF 2.523
Zhang Shixian,Rong Xinshan,Sun Ting,Gao Ping,Liu Jun,Qiu Xuchun,Zhou Xiangtong,Wu Zhiren
An energy-efficient and environmentally friendly nitrogen fixation process is urgently needed to solve problems of high energy consumption and high emissions in the traditional ammonia industry. In this work, a Z-scheme porous g-C 3 N 4 /ZnFe 2 O 4 photocatalyst was synthesized, characterized and employed for N 2 photofixation. Temperature programmed desorption characterization confirmed that the adsorption capacity of nitrogen was improved for the porous structure. From N 2 photofixation evaluation experiments, the highest ammonia production efficiency can reach 147.33 μmol/L within 120 min. Photocatalytic performance is greatly improved because of the increasing of specific surface areas, enhancement of N 2 adsorption ability and synergistic effect of Z-scheme photocatalytic system. In the ammonia production process of the research, visible light is used as energy; N 2 and H 2 O are used as raw materials, which possesses a good application potential due to the advantages of being energy-efficient, environmentally friendly and pollution-free.
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Cell and Bioscience
·
2022
·Vol. 12
·期 1
·1-20
·
IF 9.584
Zhang Yufeng,Yang Min,Zhang Sheng,Yang Zhiqiang,Zhu Yufan,Wang Yi,Chen Zhe,Lv Xuan,Huang Zan,Xie Yuanlong,Cai Lin
Background Dysregulated osteoclast activity due to altered osteoclast differentiation causes multiple bone diseases. Osteoclasts are multinucleated giant cells derived from hematopoietic stem cells and play a major role in bone absorption. However, the mechanisms underlying the tight regulation of osteoclast differentiation in multiple pathophysiological status remain unknown. Results We showed that Bhlhe40 upregulation is tightly associated with osteoclast differentiation and osteoporosis. Functionally, Bhlhe40 promoted osteoclast differentiation in vitro, and Bhlhe40 deficiency led to increased bone mass and decreased osteoclast differentiation in vivo. Moreover, Bhlhe40 deficient mice resisted estrogen deficiency and aging-induced osteoporosis. Mechanism study showed that the increase in bone mass due to Bhlhe40 deficiency was a cell intrinsic defect in osteoclast differentiation in these mice. BHLHE40 upregulated the gene expression of Fos and Nfatc1 by directly binding to their promoter regions. Notably, inhibition of Fos/Nfatc1 abrogated the enhanced osteoclast differentiation induced by BHLHE40 overexpression. Conclusions Our research reveals a novel Bhlhe40/c-Fos/Nfatc1 axis involved in regulating osteoclastogenesis and shows that osteoporosis caused by estrogen deficiency and aging can be rescued by regulating Bhlhe40 in mice. This may help in the development of a new strategy for the treatment of osteoporosis.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-9
·
IF 17.694
Chen Jinxing,Ma Qian,Zheng Xiliang,Fang Youxing,Wang Jin,Dong Shaojun
Hydrogen peroxide has been synthesized mainly through the electrocatalytic and photocatalytic oxygen reduction reaction in recent years. Herein, we synthesize a single-atom rhodium catalyst (Rh 1 /NC) to mimic the properties of flavoenzymes for the synthesis of hydrogen peroxide under mild conditions. Rh 1 /NC dehydrogenates various substrates and catalyzes the reduction of oxygen to hydrogen peroxide. The maximum hydrogen peroxide production rate is 0.48 mol g catalyst −1 h −1 in the phosphorous acid aerobic oxidation reaction. We find that the selectivity of oxygen reduction to hydrogen peroxide can reach 100%. This is because a single catalytic site of Rh 1 /NC can only catalyze the removal of two electrons per substrate molecule; thus, the subsequent oxygen can only obtain two electrons to reduce to hydrogen peroxide through the typical two-electron pathway. Similarly, due to the restriction of substrate dehydrogenation, the hydrogen peroxide selectivity in commercial Pt/C-catalyzed enzymatic reactions can be found to reach 75%, which is 30 times higher than that in electrocatalytic oxygen reduction reactions.
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Advanced Fiber Materials
·
2022
·Vol. 4
·期 5
·1177-1190
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IF 12.958
Zan Guangtao,Wu Tong,Dong Wenya,Zhou Junchen,Tu Teng,Xu Ruoxuan,Chen Yun,Wang Ying,Wu Qingsheng
Due to the lack of in-depth understanding about the folding issues of the electronic materials, it is a huge challenge to prepare a super-foldable and highly electrochemical faradic electrode. Here, inspired from from the fully nimble structures of cuit cocoons and cockscomb petals, with two-level biomimetic design, for the first time we prepared a super-foldable and electrochemically functional freestanding cathode, made of C-fiber@NiS-cockscomb (SFCNi). In virtue of its nimble biomimetic structures, SFCNi can remarkably sustain over 100,000 times, repeated true-folding without composite fibers fracture, functional matters detachment, conductivity degradation, or electrochemical performance change. The main mechanism behind these behaviors was disclosed by Real-time scanning electron microscopy and mechanical simulations, on the folding process. Results unveil that the cockscomb-like NiS with atomic thickness can deform freely due to the need of bending, and the cuit-cocoon-like SFCNi can generate an “ ε-shape ” folding structure at the crease. Such a smart self-adaptive deformation capability can effectively reduce the effect of stresses and local excessive deformations, so that the chemical bonds can preserve their interaction, and the material won’t fracture. This subtle and exceptional mechanical behavior realizes a super-foldable property. The two-level biomimetic design strategy is a novel method for fabrication of super-foldable composite electrodes and integrated multi-functional super-foldable devices. Graphical abstract
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Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Wang Jiacheng,Li Xingyong,Wu Yankun,Duan Jinyi,Zhuang Nihong,Wang Dechao,Zhang Zhaoxia,Ye Yueyuan,Li Shuirong,Zheng Zhifeng
The wide-scale application in the bio-fuel area of fatty acid methyl esters (FAME) has been limited because of its high oxygen content, awful low temperature flowability, and low heating value. In this work, the hydrodeoxygenation (HDO) of methyl palmitate as fatty acid methyl ester model compounds for long-chain alkane via Nb 2 O 5 modified NiAl 2 O 4 catalysts was investigated. The effect of Nb/Ni atomic ratio (0.05:0.30), reaction temperature (260–340 ℃), time (2–10 h), and H 2 pressure (1–5 MPa) on the production of long-chain alkane is exhaustively researched. The results show that the products are mainly pentadecane with a few other alkane hydrocarbons and nickel metal was the main active site. Besides, the added promoter Nb promoted the dispersion of active metal Nickel, increased the acidity, and thus substantially enhanced the HDO activity of methyl palmitate. In response to the best conditions (0.3 g catalyst, 3 g methyl palmitate), the methyl palmitate conversion and pentadecane selectivity over Nb 2 O 5 -NiAl 2 O 4 with 0.20 Nb/Ni atomic ratio reached 91.14% and 80.07%, respectively. However, the methyl palmitate conversion and pentadecane selectivity over pure NiAl 2 O 4 catalyst were only 62.53% and 74.67%, respectively. Therefore, Nb 2 O 5 -NiAl 2 O 4 catalysts exhibit remarkable catalytic ability for HDO of methyl palmitate to alkanes. The low cost, easy preparation, high catalytic performance, and recycling stability of Nb 2 O 5 -NiAl 2 O 4 catalyst demonstrate that catalyst Nb 2 O 5 -NiAl 2 O 4 is a promising effective and efficient catalyst for producing long-chain alkane from methyl palmitate. Graphical abstract
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CATALYSIS SURVEYS FROM ASIA
·
2022
·Vol. 26
·期 3
·211-220
·
IF 2.964
Lu Shiyao,Zhang Jian,Wu Zhiyi,Su Zerui,Huang Jianbin,Liang Yehao,Xiao Feng-Shou
Highly dispersed Au nanoparticles supported on Ni–Al mixed metal oxides (Au/NiAl-MMO) were prepared by a facile method, which is significantly efficient for the aerobic oxidation of ethyl lactate using authentic air as the oxidant, achieving 72.6% ethyl lactate conversion and 88.3% selectivity to ethyl pyruvate at 240 °C in a continuous fixed-bed reactor. The catalyst retained its catalytic performance during a long-term stability test. Characterization and experimental studies on the kinetic dependence sequence of the reactants and elementary reaction steps confirmed that the Au/NiAl-MMO catalyst followed the Mars–van Krevelen mechanism, with the activation of O 2 as the elementary step. The quasi in situ X-ray photoelectron spectroscopy spectra demonstrated that the active sites in the Au/NiAl-MMO catalyst were Au nanoparticles. This work may provide a novel technique for developing more efficient supported metal catalysts for the aerobic oxidation of ethyl lactate using authentic air as the oxidant. Graphical abstract Highly dispersed Au nanoparticle catalyst was facilely prepared for the efficient catalytic oxidation of ethyl lactate with authentic air.
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2022
·Vol. 248
·期 8
·2109-2124
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IF 3.498
Lian Yueru,Niu Liyun,Meng Zhiyun,Zhu Xiaoxia,Gu Ruolan,Wu Zhuona,Li Jian,Han Peng,Liu Taoyun,Gan Hui,Dou Guifang
As a major class of phenolic compounds, anthocyanins are the functional components of blueberry. Vaccinium corymbosum ‘Lanmei 1’ is a novel blueberry variety and detailed study of their anthocyanins remains scarce. Therefore, a simultaneously quantitative method for five anthocyanins using ultra-performance liquid chromatography – tandem mass spectrometry (UPLC – MS/MS) was established here. Good linear relationships were obtained ranging from 1 to 100 ng/mL ( R 2 > 0.99). In addition, the specificity, recovery, stability, and matrix effect met requirements of analytical methodology. The method successfully monitored the concentrations of five anthocyanins in plasma and studied their pharmacokinetics after oral administration of 270 mg of anthocyanin extract in Sprague – Dawley rats. Pharmacokinetic parameters for delphinidin-3- O -glucoside (D3G), malvidin-3- O -glucoside (M3G), malvidin-3- O -arabinoside (M3A), delphinidin-3- O -arabinoside (D3A), and petunidin-3- O -arabinoside (P3A) showed the similar short T max 0.25 – 0.28 h and medium speed T 1/2 3.24 – 3.52 h. It indicated anthocyanins were quickly absorbed and taken effectively, but eliminated in blood at an appropriate rate. Contents of D3G and M3G in anthocyanin extract are approximately equivalent, while the total amount and maximum concentration of M3G were twice those of D3G in plasma. This demonstrated that there were many differences between the substance contents of anthocyanin monomers in vitro and their absorption and distribution behaviors in vivo. Multiple peaks in both concentration – time profiles and bile excretions for five anthocyanins suggested the possibility of enterohepatic circulation in rats. The present study developed and validated a rapid and sensitive bioanalytical method based on UPLC – MS/MS for quantifying major anthocyanins from a novel blueberry extract in rat plasma to further understand their absorption, distribution, and metabolism.
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Bioresources and Bioprocessing
·
2022
·Vol. 9
·期 1
·1-14
·
IF 4.983
Wang Jin,He Wubo,Tan Wen-Song,Cai Haibo
Epigallocatechin-3-gallate (EGCG) is a plant-derived flavonoid compound with the ability to promote the differentiation of human bone marrow-derived mesenchymal stem cells (MSCs) into osteoblasts. However, the effect of EGCG on the osteogenic differentiation of the human umbilical cord-derived mesenchymal stem cells (HUMSCs) is rarely studied. Therefore, in this study, the osteogenic effects of EGCG are studied in the HUMSCs by detecting cell proliferation, alkaline phosphatase (ALP) activity, calcium deposition and the expression of relevant osteogenic markers. The results showed that EGCG can promote the proliferation and osteogenic differentiation of the HUMSCs in vitro at a concentration of 2.5–5.0 μM. Unfortunately, the EGCG is easily metabolized by cells during cell culture, which reduces its bioavailability. Therefore, in this paper, EGCG-loaded microspheres (ECM) were prepared and embedded in chitosan/carboxymethyl cellulose/montmorillonite (CS/CMC/MMT) scaffolds to form CS/CMC/MMT-ECM scaffolds for improving the bioavailability of EGCG. The HUMSCs were cultured on CS/CMC/MMT-ECM scaffolds to induce osteogenic differentiation. The results showed that the CS/CMC/MMT-ECM scaffold continuously released EGCG for up to 22 days. In addition, CS/CMC/MMT-ECM scaffolds can promote osteoblast differentiation. Taken together, the present study suggested that entrainment of ECM into CS/CMC/MMT scaffolds was a prospective scheme for promotion osteogenic differentiation of the HUMSCs. Graphical Abstract
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BMC Veterinary Research
·
2022
·Vol. 18
·期 1
·1-14
·
IF 2.792
Hao Fei,Xie Xing,Feng Zhixin,Chen Rong,Wei Yanna,Liu Jin,Xiong Qiyan,Shao Guoqing,Lin Johnson
Background Mycoplasma hyopneumoniae (M. hyopneumoniae) is the etiological agent of enzootic pneumonia, a highly infectious swine respiratory disease that distributed worldwide. The pathogenesis and virulence factors of M. hyopneumoniae are not fully clarified. As an important virulence factor of bacteria, nicotinamide adenine dinucleotide (NADH) oxidase (NOX) participates in host-pathogen interaction, however, the function of NOX involved in the pathogenesis of M. hyopneumoniae is not clear.Results In this study, significant differences in NOX transcription expression levels among different strains of M. hyopneumoniae differed in virulence were identified, suggesting that NOX may be correlated with M. hyopneumoniae virulence. The nox gene of M. hyopneumoniae was cloned and expressed in Escherichia coli, and polyclonal antibodies against recombinant NOX (rNOX) were prepared. We confirmed the enzymatic activity of rNOX based on its capacity to oxidize NADH to NAD+. Flow cytometry analysis demonstrated the surface localization of NOX, and subcellular localization analysis further demonstrated that NOX exists in both the cytoplasm and cell membrane. rNOX was depicted to mediate adhesion to immortalized porcine bronchial epithelial cells (hTERT-PBECs). Pre-neutralizing M. hyopneumoniae with anti-rNOX antibody resulted in a more than 55% reduction in the adhesion rate of high- and low-virulence M. hyopneumoniae strains to hTERT-PBECs. Moreover, a significant difference appeared in the decline in CCU50 titer between virulent (168) and virulence-attenuated (168L) strains. NOX not only recognized and interacted with host fibronectin but also induced cellular oxidative stress and apoptosis in hTERT-PBECs. The release of lactate dehydrogenase by NOX in hTERT-PBECs was positively correlated with the virulence of M. hyopneumoniae strains.Conclusion sNOX is considered to be a potential virulence factor of M. hyopneumoniae and may play a significant role in mediating its pathogenesis.
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