MATERIALS CHEMISTRY AND PHYSICS
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2022
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IF 4.778
Wei Cai,Xiaowei Mu,Zhaoxin Li,Weizhao Hu,Yuan Hu
Towards simultaneously improving the moist ambient stability and flame retardancy efficiency of black phosphorus (BP) nanosheets , cross-linked polydimethylsiloxane (PDMS) is simultaneously synthesized and grafted onto the surface of BP nanosheets, thus obtaining hydrophobicity to shield the water molecule and synergistic flame retardant effect. Compared to badly damaged morphology of pure BP nanosheets, the well-ordered crystal structure confirms that PDMS-BP nanosheets are moist-environmentally stable. With the grafting of PDMS, BP nanosheets present higher flame retardancy efficiency to thermoplastic polyurethane (TPU). The reductions of 59.6% and 14.3% are presented in peak heat release rate (PHRR) and total heat release (THR) of TPU resin, compared with pure TPU. The CO 2 and CO produced by resin combustion are also decreased by 42.8% and 29.3%, indicating lower gas toxicity. Based on the morphology observation and element analysis of char residue, the synergistic effect between phosphorus and silicon elements is responsible for the flame retardancy improvement. Such a route simultaneously provides a valuable reference for moist-environmentally unstable nanomaterials and develops the practical application of BP nanosheets in polymer composites fields.
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BRITISH JOURNAL OF PHARMACOLOGY
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2022
·Vol. 179
·期 17
·4440-4456
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IF 9.473
Mengru Bai,Mingyang Chen,Qingquan Zeng,Shuanghui Lu,Ping Li,Zhiyuan Ma,Nengming Lin,Caihong Zheng,Hui Zhou,Su Zeng,Dongli Sun,Huidi Jiang
Background and Purpose Plasma triglyceride (TG) levels increase as gestation proceeds, and abnormal elevation of TG increases the risk of pregnancy complications. The current study explored the mechanisms involved in hypertriglyceridaemia during pregnancy. Experimental Approach Lipid profile and expression levels of key genes involved in liver TG metabolism in non-pregnant and pregnant mice were studied. The effects of pregnancy-related hormones on key genes and the underlying mechanisms were uncovered in vitro and in vivo. Key Results Plasma and hepatic TG levels were elevated, while hepatic fatty acid translocase (FAT/CD36) was up-regulated in pregnant mice. Corticosterone and cortisol (endogenous glucocorticoids that are elevated during pregnancy), but not oestradiol or progesterone, significantly up-regulated CD36 in hepatocytes, and this was abolished after knockdown of the glucocorticoid receptor (GR) using a siRNA or in the presence of GR antagonists, RU486 and AL082D06. The luciferase reporter gene and chromatin immunoprecipitation assay further revealed that corticosterone/cortisol promoted the direct binding of GR to the CD36 promoter and up-regulated its transcription. Chronic corticosterone exposure induced liver lipid accumulation and increased plasma TG levels in mice, which were attenuated by RU486 via inhibition of the GR-CD36 pathway. Conclusions and Implications Increased corticosterone/cortisol induces liver lipid accumulation and hypertriglyceridaemia during pregnancy by accelerating fatty acid uptake into hepatocytes via activation of GR and its target gene, CD36. Our results may be useful for the prevention of severe hypertriglyceridaemia and associated pregnancy complications. Graphical
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PubMed
高影响因子
Foods
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2022
·Vol. 11
·期 9
·1176
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IF 5.561
Wenjie Wang,Zhiwen Zhang,Xiaoying Liu,Xiaoji Cao,Lianzhu Wang,Yuting Ding,Xuxia Zhou
Malondialdehyde (MDA) is one of the representative end products under lipid peroxidation, indicating the degree of lipid oxidation in foods. However, compounds in pickled products, especially the nitrite in salted lean pork can react with MDA under the acidic condition, leads to the loss of MDA and an underestimation on lipid oxidation through the conventional assay. In this study, the quantification for MDA in the sample containing sodium nitrite were found lacking accuracy by the thiobarbituric acid (TBA) assay and chromatography assay based on alkaline hydrolysis as the reaction between them were difficult to be completely inhibited. Among other trials, the improvement GC-MS analysis utilizing deuterium substituted MDA (MDA-d2) as an internal standard and applying perfluorophenylhydrazine (PFPH) as a derivative reagent can reduce the deviations from the presence of nitrite in the salted lean pork meat and the recovery is between 93.9% and 98.4% and coefficient of variation for the intermediate precision is between 1.1 and 3.5% using the method. The advanced gas chromatograph mass spectrometer (GC-MS) assay also has a very low detection limit (0.25 ng/mL) with both hydrolysis types.Keywords:malondialdehyde;lipid peroxidation;pickled products;nitrite;GC-MS
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 13
·6267-6273
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IF 3.925
Qinyi Mao,Dandan Li,Yuming Dong
Recently, much attention has been focused on the development of photocatalysts for hydrogen evolution. Up to now, efficient hydrogen generation is still greatly challenging due to the restraints of the surface redox reaction rate, and the introduction of a co-catalyst is one of the keys to this problem. Here, dual non-noble co-catalysts NixP and Mn3O4 were proposed and prepared on a g-C3N4/red phosphorus (CNP) hybrid structure with a high light adsorption capability by a two-step photo-deposition method. The photo-excited charge on the composite catalyst separate and transfer from C3N4 to red phosphorous due to a type I heterojunction structure. NixP and Mn3O4 act as reductive and oxidative co-catalysts, respectively. The hydrogen production rate was 5851.3 μmol g−1 h−1, 12.4 times that of pure CNP. The consistent catalytic activity in an actual 25 mL flask for hydrogen evolution over eight hours accumulated 245.08 μmol H2 under solar simulated irradiation. This work provides practical reference for the development of a novel inexpensive photocatalyst system.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Shuke Huang,Jun Li,Yilan Chen,Liwei Yan,Peixin Zhang,Xueyan Zhang,Chenyang Zhao
In this work, we reported a novel polyphosphide strategy for the synthesis of phosphorus doped Pd (P-Pd) using red phosphorus as the starting material at quasi-ambient conditions. Polyphophide anions, as the key reaction intermediates, served as the reducing agent and phosphorus source to modulate the surface electronic structure of Pd. The P-Pd obtained exhibited topmost CO tolerance and electrocatalytic activity to formic acid oxidation among the state-of-arts reports. The mass activity and turnover frequency of P-Pd reached 4413 mA mg −1 Pd and 16.04 s −1 at 0.8 V, which were 23.7 and 6.4 times that of commercial Pd/C respectively. After 1000 repeated cycles, 82% initial activity was reserved. Combined with the electrochemical analysis and the density functional theory calculation, the boosted electrochemical performances can be attributed to the size and electronic effects induced by the P doping, which increase the surface actives sites, inhibit the adsorption of CO and change the reaction pathway to favorable CO 2 route. A full cell was also assembled to demonstrate the practical potential of the P-Pd, which showed a maximum power density of 21.56 mW cm −2 . This polyphophide-based reaction route provides a new strategy for the preparation of efficient and durable phosphorus doped alloys for electrocatalysis.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Liang Cheng,Shuilai Qiu,Jing Wang,Weijian Chen,Jingwen Wang,Wenxiang Du,Lei Song,Yuan Hu
Human health is being seriously harmed by tumors. In order to obtain excellent anti-tumor effects, platinum (Pt) nanozyme-modified black phosphorus (BP) loading with L -Arginine (LArg) (BPPL) is prepared to realize nitric oxide (NO) therapy and sonodynamic therapy (SDT), achieving a synergistic effect to therapy. In this system, BP is utilized as the sonosensitizer. Pt can catalyze the decomposition of hydrogen peroxide (H 2 O 2 ) to produce oxygen (O 2 ) and relieve the hypoxic environment of tumor tissue. The increase in O 2 concentration is conducive to the generation of ROS under ultrasound (US) stimulation. The deposition of precious metals hinders the recombination of some electrons (e ) and holes (h + ), and further improves the yield of reactive oxygen species (ROS). LArg is employed as the exogenous NO supplementation. Under the stimulation of US and ROS, NO is generated to cause further cell apoptosis. Tests in vitro and in vivo have proved the great potential of the combination of SDT and gas therapy in tumor treatment.
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ACS Catalysis
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2022
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IF 13.7
Zhichao Jia,Na Ji,Xinyong Diao,Xinxin Li,Yujun Zhao,Xuebin Lu,Qingling Liu,Caixia Liu,Guanyi Chen,Longlong Ma,Shurong Wang,Chunfeng Song,Changzhi Li
A strategy for low-temperature synthesis of hydrotalcite-based nickel phosphide catalysts (Ni2P-Al2O3) with flower-like porous structures was proposed. The in situ reduction of red phosphorus at 500 °C enables Ni2P catalysts with small particle size and abundant active and acidic sites, which facilitate the activation of substrates and H2. In the hydrodeoxygenation of guaiacol, a 100% conversion and 94.5% yield of cyclohexane were obtained over the Ni2P-Al2O3 catalyst under 5 MPa H2 at 250 °C for 3 h. Other lignin-derived phenolic compounds could also afford the corresponding alkanes with yields higher than 85%. Moreover, Ni2P-Al2O3 exhibited high hydrodeoxygenation activity in the deconstruction of more complex wood structures, including lignin oil and real lignin. Among the two different types of Ni sites of Ni(1) and Ni(2) in Ni2P, density functional theory (DFT) calculations showed that the Ni(2) site, highly exposed on the Ni2P-Al2O3 surface, possesses a stronger ability to break C–OH bonds during the hydrodeoxygenation of guaiacol in comparison with the Ni(1) site.
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ELECTROCHIMICA ACTA
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2022
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IF 7.336
Lin Zhu,Yan Zhang,Baoli Wang,Ruyi Zou,Yuhao Huang,Wei Sun
Equivalent circuit model (ECM) is one of the most commonly used tools in electrode process analysis such as hydrogen evolution reaction (HER) process in electrochemical impedance spectroscopy experiment. This work attempts to analyze dynamic element values of ECM of cobalt phosphide-boron nitride doped carbon (CoP/BN-C) in HER process during linear sweep voltammetric test with the help of Kalman filter algorithm. Tafel slopes of CoP/BN-C in alkaline solution and in seawater are close (∼106 mV•dec −1 ) with the overpotential ( η ) of 154 mV and 545 mV to drive a current density of 10 mA•cm −2 , respectively. Polarization resistance (R pol ) of CoP/BN-C calculated from system identification reaches 2.21 kΩ in seawater, which is about twice of the maximum value in alkaline solution. Power analysis can also certificate the difference of catalytic efficiency in different electrolyte. The potential position of the maximum R pol is close to the position of onset potential. This contribution provides a practical and effective strategy to obtain R pol from LSV curves and presents a two-dimensional image composed of η and R pol , which may supplement more information on catalytic activity of HER process in various environments.
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COMPOSITES PART B-ENGINEERING
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2022
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IF 11.322
Jing He,Hua Wang,Yi Gong,Xingyou Tian,Zhiliang Zhang,Jianying He
Recently, construction of effective three-dimensional (3D) heat transfer networks inside polymer has emerged as a promising design strategy to improve the isotropic thermal conductivity for electronic packaging materials. Hexagonal boron nitride (BN) sheets are popular carriers for constructing 3D networks. But removing overheat capability of BN was greatly sacrificed due to size limitation when constructing 3D network. Herein, a novel 3D heat-transferring network, interconnected boron phosphide (BP) grains in-situ growing on Ni foam, was designed to alternate 3D BN network. An isotropic 3D-BP@Ni network with high-quality and integrity was successfully fabricated by a simple high temperature treatment. The synthesized 3D-BP@Ni was incorporated into epoxy resin (ER) by infiltration to fabricate composites. ER/3D-BP@Ni composite, with strong interfacial adhesion between epoxy and 3D-BP@Ni, achieved a high thermal conductivity of 2.01 W/(mK), which corresponded to 908.53% and 402.00% enhancement compared to pure epoxy and ER/Ni composite. The coefficient of thermal expansion (CTE) of the composite reached as low as 26.95 × 10 −6 /°C, much smaller than epoxy of 60.69 × 10 −6 /°C and ER/Ni composite of 59.42 × 10 −6 /°C. The designed ER/3D-BP@Ni composite has distinguished heat removal and CTE with semiconductors from traditional polymer composites containing 3D BN network. This strategy is promising to promote the development of electrical packaging materials with high isotropic thermal conductivity.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Yanqi Liu,Bo Jiang,Jiaming Luo,Jing Yang,Peichao Lian,Xinzhi Chen,Li Ding,Yi Mei
Two-dimensional (2D) materials bring a great opportunity to fabricate molecular sieving membranes that can potentially break the permeability-selectivity trade-off. Although 2D laminar membranes with interlayer nanochannels as molecular sieving channel were widely studied, for most of reported 2D laminar membranes, it is of a great challenge to fabricate highly ordered interlayer nanochannels for mass transport. Herein, we report a novel kind of black phosphorene membrane which is made from the stacking of highly ordered 2D black phosphorene nanoflakes. The as prepared black phosphorene membrane shows H 2 permeance > 1000 GPU and H 2 /CO 2 selectivity > 100 for H 2 /CO 2 mixed gas, demonstrating an extremely high gas separation performance. The DFT calculation results demonstrate that the interlayer galleries in the black phosphorene membrane allow the H 2 passing through easily while block the other gases with bigger kinetic diameters, matching well with the experimental findings. The present results indicate that the interlayer galleries in the black phosphorene membrane can be applied as molecular sieving channels for gas separation.
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Journal of Energy Chemistry
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2022
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IF 13.599
Miao Wang,Zhenpeng Yao,Qianqian Li,Yongfeng Hu,Xiuping Yin,Aibing Chen,Xionggang Lu,Jiujun Zhang,Yufeng Zhao
Wadsley-Roth (W-R) structured oxides featured with wide channels represent one of the most promising material families showing compelling rate performance for lithium-ion batteries. Herein, we report an in-depth study on the fast and extensive intercalation chemistry of phosphorus stabilized W-R phase PNb 9 O 25 and its application in high energy and fast-charging devices. We explore the intercalation geometry of PNb 9 O 25 and identify two geometrical types of stable insertion sites with the total amount much higher than conventional intercalation-type electrodes. We reveal the ion transportation kinetics that the Li ions initially diffuse along the open type III channels and then penetrate to edge sites with low kinetic barriers. During the lithiation, no remarkable phase transition is detected with nearly intact host phosphorous niobium oxide backbone. Therefore, the oxide framework of PNb 9 O 25 keeps almost unchanged with all the fast diffusion channels and insertion cavities well-maintained upon cycling, which accomplishes the unconventional electrochemical performance of W-R structured electrodes.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Renquan Guan,Lijing Wang,Dandan Wang,Kexue Li,Huaqiao Tan,Yunning Chen,Xueying Cheng,Zhao Zhao,Qingkun Shang,Zaicheng Sun
The Coulomb interactions between excited electrons and holes have a very important influence on the photophysical processes in 2D semiconductors. Exciton dissociation is one of the key steps that significantly contribute to the efficiency of photocatalysis, but its research in the relevant aspects of photocatalysis has not been in-depth. Herein, the BP/TiO 2 heterojunction as a prototypical model system was constructed on the surface of urchin-like TiO 2 where black phosphorous (BP) quantum dots (QDs) grew. The BP/TiO 2 heterojunction exhibits an improved H 2 -production rate of 112 μmol·h −1 ·g −1 under UV–visible light irradiation without any cocatalysts, which is 2.4 times higher than that of pure TiO 2 (47 μmol·h −1 ·g −1 ). As a typical exciton-rich material, BP QDs have special advantages on the charge separation process, because of their prominent many-body effect, short carrier transport distance, and large specific surface with rich reactive sites. The energy difference between the conduction bands turns out to be the driving force for exciton dissociation in the BP/TiO 2 heterojunction. The theoretical calculation implies that the excited electron tends to transfer from BP QD to TiO 2 . The high catalytic performance of heterojunction contributes to the effective exciton dissociation, interfacial charge separation, and charge-carrier accumulation. This work lays the foundation for the design of the BP QDs based photocatalytic system and its application in photocatalytic hydrogen production and provides an effective reference for increasing the active sites of heterojunctions.
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