Journal of Physical Chemistry C
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2018
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IF 4.484
Fengjiao Chen,Guoyong Fang,Zhipeng Yan,Yuexiao Pan,Jianbo Liu,Lin Wang
The cation structural changes of two 1-butyl-3-methylimidazolium halides, [BMIM]Cl and [BMIM]Br, are investigated by in situ Raman spectroscopy, infrared spectroscopy, and synchrotron X-ray diffraction as a function of hydrostatic pressure. The [BMIM]+ cations of [BMIM]Cl take the TT conformation under ambient conditions, undergo significant changes at 3.4 GPa, which is related to the potential formations of some new cation conformations, and take another conformation from 6.8 to 35.6 GPa. Correspondingly, crystalline [BMIM]Cl has a structure transition at 3.4 GPa, originating directly from the cation conformational changes. The [BMIM]+ cations totally transform into the GT conformer, if the diamond anvil cell-loaded sample is treated at 423 K for 12 h in a furnace before being cooled down to room temperature. It is the first time to observe the complete conformational transition from one conformer (TT) to another (GT) for the [BMIM]+ salts in experiments. The cations preserve the GT conformation as pressure reaches 44.6 GPa for heat-treated [BMIM]Cl. As a comparison, without and with the heat treatment, the [BMIM]+ cations of [BMIM]Br keep the GT conformation at high pressures up to 29.6 GPa, as it is a relatively stable state. Moreover, a notable photoluminescence emerges at high pressures over 20.0 GPa and is maintained in the decompression process, as a result of the pressure-induced polymerization of a small portion of the [BMIM]+ cations.
研究领域:
物理化学
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材料科学
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高压物理
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离子液体
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光谱学
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MICROPOROUS AND MESOPOROUS MATERIALS
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2013
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IF 3.365
Xue Jiang,Zhuang Zhuang,Feng Xin
Highly b-oriented Titanium Silicalite-1 (TS-1) zeolite films were synthesized on polyvinyl acetate (PVAc) modified glasses by hydrothermal crystallization. The prepared samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FT-IR) and a contact-angle instrument. The results showed that the mass of PVAc on the glasses would influence the process of superficial nucleation and oriented growth of TS-1 films profoundly. A favorable amount of PVAc on smooth surface of glassy substrate was determined to form a highly b-oriented and fully covered TS-1 film by attracting appropriate precursor and template, then making TS-1 nucleate and grow orientedly. Based on the obtained results, a scheme of fabricating b-oriented TS-1 films was proposed.
研究领域:
材料科学
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无机化学
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薄膜制备
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沸石化学
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PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
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2017
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IF 0.809
Shaohua Zhu,Yan Zhang,Peipei Li,Wenzhu Bi,Xiaolan Chen,Yufen Zhao
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Nature Communications
·
2026
·
IF 18.1
Du Yuxiang,Xiu Yueyue,Yang Xin,Fu Rui,Liu Dan,Liu Lipeng,Sai Huazheng
Aerogels exhibit excellent properties owing to their nano-sized building blocks and unique structures. With increasing application demands, traditional nanoscale building blocks have limitations in further optimizing the performance of aerogels; therefore, the development of novel, high-performance building blocks has become an urgent challenge in the field. Sub-1 nm nanowires (SNWs) exhibit polymer-like properties that make them superior to nanoscale nanowires, and are well-suited as new building blocks for aerogels. In this study, we achieved precise control over the aggregation state of GdOOH SNWs (Gd–SNWs) in three-dimensional space by regulating the interactions between SNWs as well as between SNWs and solvents, thereby obtaining SNW aerogels (SNWAs) with low density ( ~ 0.024 g cm −3 ) and high specific surface area (505 m 2 g −1 ). After silanization, the superhydrophobic SNWAs exhibited excellent fatigue resistance (50 cycles with a set strain of 50%). This innovative approach enriches the types of aerogels building blocks and opens up new avenues for high-performance aerogels.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
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IF 10.9
Mingxin Zhang,Cuiying Pei,Qi Wang,Yi Zhao,Changhua Li,Weizheng Cao,Shihao Zhu,Juefei Wu,Yanpeng Qi
Recently, the discovery of superconductivity with a critical temperature T c up to 80 K in Ruddlesden–Popper phases La n +1 Ni n O 3 n +1 ( n = 2) under pressure has garnered considerable attention. Up to now, the superconductivity was only observed in La 3 Ni 2 O 7 single crystal grown with the optical-image floating zone furnace under oxygen pressure. It remains to be understood the effect of chemical doping on superconducting La 3 Ni 2 O 7 as well as other Ruddlesden–Popper phases. Here, we systematically investigate the effect of external pressure and chemical doping on polycrystalline Ruddlesden–Popper phases. Our results demonstrate that the application of pressure and doping effectively tunes the transport properties of Ruddlesden–Popper phases. We find pressure-induced superconductivity up to 86 K in La 3 Ni 2 O 7 polycrystalline sample, while no signatures of superconductivity are observed in La 2 NiO 4 and La 4 Ni 3 O 10 polycrystalline samples under high pressure up to 50 GPa. Our study sheds light on the exploration of high- T c superconductivity in nickelates.
研究领域:
凝聚态物理
·
材料科学
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2025
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IF 6.2
Yijie Li,Shun Zeng,Weinong Zhang,Junbo He,Jiangtao Feng
Peach brown rot, caused by Monilinia fructigena (M. fructigena), is a destructive disease that affects peaches during pre- and postharvest stages. In this study, two 1-O-alkylglycerols (AKGs), namely, AKG-2 (1-O-dodecylglycerol) and AKG-4 (3-(2-ethylhexyloxy)propane-1,2-diol), demonstrated significant in vitro antifungal activity against M. fructigena, with EC50 values of 102 and 103 μg/mL, respectively. At a concentration of 200 μg/mL, both compounds effectively suppressed brown rot symptoms in inoculated peaches, achieving a protective efficacy of 93.2%. Mechanistic investigations revealed that AKG-2 and AKG-4 disrupted the surface morphology and internal ultrastructure of fungal hyphae, compromised the integrity of the cell membrane and nucleus, and reduced mitochondrial membrane potential. Moreover, treatment with these compounds induced the accumulation of reactive oxygen species, leading to elevated malondialdehyde levels and decreased activities of key antioxidant enzymes including superoxide dismutase and catalase. These results suggest that AKG-2 and AKG-4 exhibit antifungal effects through multiple synergistic mechanisms including membrane and nuclear damage, mitochondrial dysfunction, and oxidative stress induction. This study, for the first time, provides valuable mechanistic insights into the antifungal effects of AKGs and supports their potential as naturally derived fungicidal agents for the protection of peach fruits.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·Vol. 39
·期 7
·3313-3319
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IF 2.93
Jing Lin,Fei Liang,Yaoming Wu,Wanqiang Liu,Limin Wang
We prepared Ti 1.4 V 0.6 Ni ribbons by arc-melting and subsequent melt-spinning techniques. Ti 1.4 V 0.6 Ni + x Mg ( x = 1, 1.5, 2, 2.5 and 3, wt.%) composite alloys were obtained by the mechanical ball-milling method. The structures and hydrogen storage properties of alloys were investigated. Ti 1.4 V 0.6 Ni + x Mg composite alloys contained icosahedral quasicrystalline phase, Ti 2 Ni-type phase, β-Ti solid-solution phase and metallic Mg. The electrochemical and gaseous hydrogen storage properties of alloys were improved with Mg addition. Ti 1.4 V 0.6 Ni + 2 Mg alloy showed maximum electrochemical discharge capacity of 282.5 mAh g −1 as well as copacetic high-rate discharge ability of 82.3% at the discharge current density of 240 mA g −1 compared with that of 30 mA g −1 , and the cycling life achieved above 200 mAh g −1 after 50 consecutive cycles of charging and discharging. The hydrogen absorption/desorption properties of Ti 1.4 V 0.6 Ni + x Mg ( x = 1, 2 and 3, wt.%) alloys were better than Ti 1.4 V 0.6 Ni. Ti 1.4 V 0.6 Ni + 3 Mg alloy also exhibited a favorable hydrogen absorption capacity of 1.53 wt.%. The improvement in the hydrogen storage characteristics caused by adding Mg may be ascribed to better hydrogen diffusion and anti-corrosion ability.
研究领域:
材料科学
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金属功能材料
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储能材料
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物理化学
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电化学
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PEST MANAGEMENT SCIENCE
·
2023
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IF 4.1
Yifan Li,Shujun Ni,Yunping Wang,Ruichi Li,Hong Sun,Xuan Ye,Zhen Tian,Yalin Zhang,Jiyuan Liu
BACKGROUND Insecticide resistance continuously poses a threat to agricultural production. Chemosensory protein-mediated resistance is a new mechanism of insecticide resistance discovered in recent years. In-depth research on resistance mediated by chemosensory proteins (CSPs) provides new insight into aid insecticide resistance management. RESULTS Chemosensory protein 1 in Plutella xylostella ( PxCSP1 ) was overexpressed in the two indoxacarb-resistant field populations and PxCSP1 has a high affinity with indoxacarb. PxCSP1 was upregulated when exposed to indoxacarb and the knockdown of this gene elevated sensitivity to indoxacarb, which demonstrate that PxCSP1 is involved in the indoxacarb resistance. Considering that CSPs may confer resistance in insects via binding or sequestering, we explored the binding mechanism of indoxacarb in PxCSP1 -mediated resistance. Using molecular dynamics simulations and site-directed mutation, we found that indoxacarb forms a solid complex with PxCSP1 mainly through van der Waals interactions and electrostatic interactions. Between these, the electrostatic interaction provided by the Lys100 side chain in PxCSP1 , and especially the hydrogen bonding between the NZ atom and the O of the carbamoyl carbonyl group of indoxacarb, are the key factors for the high affinity of PxCSP1 to indoxacarb. CONCLUSIONS The overexpression of PxCPS1 and its high affinity to indoxacarb is partially responsible for indoxacarb resistance in P. xylostella . Modification of indoxacarb's carbamoyl group has the potential to alleviate indoxacarb resistance in P. xylostella . These findings will contribute to solving chemosensory protein-mediated indoxacarb resistance and provide a better understanding of the insecticide resistance mechanism. © 2023 Society of Chemical Industry.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2022
·Vol. 120
·期 1
·e2209339120
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IF 12.779
Fei Qiao,Yuedong He,Yuhao Zhang,Xuefei Jiang,Hanqing Cong,Zhiming Wang,Huapeng Sun,Yibei Xiao,Yucheng Zhao,Peter Nick
Cephalotaxines harbor great medical potential, but their natural source, the endemic conifer Cephalotaxus is highly endangered, creating a conflict between biotechnological valorization and preservation of biodiversity. Here, we construct the whole biosynthetic pathway to the 1-phenethylisoquinoline scaffold, as first committed compound for phenylethylisoquinoline alkaloids (PIAs), combining metabolic modeling, and transcriptome mining of Cephalotaxus hainanensis to infer the biosynthesis for PIA precursor. We identify a novel protein, ChPSS, driving the Pictet–Spengler condensation and show that this enzyme represents the branching point where PIA biosynthesis diverges from the concurrent benzylisoquinoline-alkaloids pathway. We also pinpoint ChDBR as crucial step to form 4-hydroxydihydrocinnamaldehyde diverging from lignin biosynthesis. The elucidation of the early PIA pathway represents an important step toward microbe-based production of these pharmaceutically important alkaloids resolving the conflict between biotechnology and preservation of biodiversity.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Yongdi He,Jinou Song,Yuan Zhuang,Yongfeng Liu,Jibiao Xie
In order to investigate the effects of 1- nitropropane ( 1- NP) on the pyrolysis of n- hexane , the pyrolysis processes of pure n- hexane and n- hexane/ 1- NP mixture in a jet-stirred reactor (JSR) were experimentally studied at atmospheric pressure with the technique of synchrotron ultraviolet photoionization mass spectrometry (SVUV-PIMS). The pyrolysis experiments of pure n- hexane and n- hexane/ 1- NP mixture were performed in the temperature ranges of 673–1143 K and 598–1128 K, respectively. The species pools for the pyrolysis of pure n- hexane and n- hexane/ 1- NP mixture were comprehensively determined and 25 species for pyrolysis of pure n- hexane versus 18 species for pyrolysis of n- hexane/ 1- NP mixture were identified. Based on the photoionization mass spectra scanned at different photon energies, the mole fraction profiles of all the pyrolysis species were evaluated. The experimental results showed that the initial pyrolysis temperature of n- hexane was observably reduced by 75 K with the addition of 1- NP, and the initial formation temperatures (IFTs) of some major pyrolysis products and important intermediates were correspondingly reduced. A high degree of conformity in the species pools of the pyrolysis of pure n- hexane and n- hexane/ 1- NP mixture (at both low and atmospheric pressures) was observed. On the basis of the experimental observations, modeling simulations and mechanisms proposed in previous studies, the low-temperature mechanisms for the 1- NP-initiated pyrolysis of n- hexane were discussed. A mechanism, including unimolecular dissociation reactions of 1- NP, radical reactions to produce highly active radicals, H-abstraction reactions of n- hexane and subsequent C-C bond dissociation reactions of hexyl radicals, was proposed.
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MOLECULES
·
2023
·Vol. 28
·期 17
·6303
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IF 4.6
Chuhong Chen,Ying Deng,Linyan Liu,Zhenyan Zou,Chenzhong Jin,Zhiyin Chen,Shuanghui Wang
Deltamethrin (DM), a Type II pyrethroid, is widely used worldwide in agriculture, household applications, and medicine. Recent studies have shown that DM exerts a variety of toxic effects on organs such as the kidney, heart muscle, and nerves in animals. However, little is known about the effects of high-dose DM on growth and development, and the mechanism of toxicity remains unclear. Using theCaenorhabditis elegansmodel, we found that high-dose DM caused a delay in nematode development. Our results showed that high-dose DM reduced the activation of the endoplasmic reticulum unfolded protein response (UPRER). Further studies revealed that high-dose DM-induced developmental toxicity and reduced capacity for UPRERactivation were associated with the IRE-1/XBP-1 pathway. Our results provide new evidence for the developmental toxicity of DM and new insights into the mechanism of DM toxicity.Keywords:deltamethrin;Caenorhabditis elegans;development;toxicity;endoplasmic reticulum unfolded protein response
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Arabian Journal of Chemistry
·
2023
·
IF 6
Qiangjun Kang,Guohui Liu,Changan Liu,Weina Ren,Yuqing Wang
Bone defects are common consequences of bone trauma. The application of biomaterials as tissue scaffolds combined with oxygenating agents, as bone regeneration promoters, is an interesting strategy to improve bone repair. The present study aimed to investigate the potential of a temperature-sensitive hydrogel containing 1-bromoheptafluorooctane in repairing rabbit bone defects and its possible mechanism of action. Bone defects were surgically created in the femoral condylar of New Zealand White rabbits. The animals were divided into three groups: A) treated with the temperature-sensitive hydrogel containing 1-bromoheptafluorooctane with oxygen release; B) treated with the temperature-sensitive hydrogel containing 1-bromoheptafluorooctane without oxygen release; and C) received no treatments. At four and 12 weeks post-operation, the specimens from all groups were collected. The new bone formation was studied by morphological observation, X-ray, Micro-CT, Masson’s trichrome, and CD31 immunohistochemical staining. At 12 weeks post-operation, the bone defects were completely healed in groups A and B, while a major bone defect was still present in group C. Micro-CT showed that TMD, BVF, Tb.Th and Tb.N in group A were significantly higher compared to the other groups at each time point post-operation. The SMI value of group A showed a significant difference from the other groups at 12 weeks post-operation. The number of micro-vessels in group A was significantly higher compared to the other groups at four and 12 weeks post-operation. The oxygenating temperature-sensitive hydrogel containing 1-bromoheptafluorooctane could effectively promote new bone formation while increasing tissue vascularization, highlighting a good clinical application prospect.
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