查找使用阿拉丁产品的科研文献

The role of 1-octyl-3-methylimidazolium hexafluorophosphate in anticorrosion coating formula development

Zeping Wang,Binjie Hu,George Zheng Chen

A hydrophobic ionic liquid (1-octyl-3-methylimidazolium hexafluorophosphate, C 8 mimPF 6 ) with a function of inhibiting corrosion was encapsulated at different concentrations in the copolymer of poly (methyl methacrylate) and poly (butyl acrylate) through miniemulsion polymerization. These latexes were coated on steel samples whose corrosion properties were evaluated by electrochemical techniques. It was found that increasing the C 8 mimPF 6 concentration from 0 wt% to 30 wt%, the corrosion inhibition efficiency was remarkably improved from 41% to 89% based on the charge transfer resistance and from 64% to 87% based on the corrosion current density, respectively. The ionic liquid did not attend the reaction during latex preparation but behaved as corrosion inhibitors on the steel surface. Such an anticorrosion effect could be ascribed to the physical adsorption of the C 8 mim + cation on the reaction sites and the hydrophobicity enhancement resulting from the hydrophobic PF 6 − anion.

Controllable growth of 2H-1 T′ MoS2/ReS2 heterostructures via chemical vapor deposition

Jiahao Yao,Haiyang Liu,Qingming He,Kai Chen,Yaping Wu,Xu Li,Chunmiao Zhang,Zhiming Wu,Junyong Kang

Two-dimensional (2D) 2H-1 T′ heterojunctions based on transition-metal dichalcogenides have attracted great attention due to their special interface structures and novel properties. Understanding the growth mechanism and the interface structures is essential for their controllable growth. In this work, we successfully synthesize lateral and vertical MoS 2 /ReS 2 heterojunctions by using a two-step chemical vapor deposition (CVD) method, and deeply explore the evolution of the structure. It is found that the growth mode of heterojunction undergoes a transition from lateral epitaxy to vertical stacking under a high Re/S ratio during the growth. Furthermore, the interface structure is greatly determined by the edge shape of MoS 2 core. Two kinds of structures, with the b-axis of 1 T′ ReS 2 shell parallel to the (1   0   0) and (0   1   0) plane of MoS 2 core respectively, are observed. Meanwhile, by comparing with MoS 2 monolayer, MoS 2 /ReS 2 heterostructures possess a reduced emission intensity due to the carrier transfer. This work provides a robust and controllable strategy for the synthesis of heterostructures with different phase structures.

General Synthesis of Lead-Free Metal Halide Perovskite Colloidal Nanocrystals in 1-Dodecanol

Ming-Ming Yao,Chen-Hui Jiang,Ji-Song Yao,Kun-Hua Wang,Chen Chen,Yi-Chen Yin,Bai-Sheng Zhu,Tao Chen,Hong-Bin Yao

Lead halide perovskite nanocrystals (NCs) exhibit great application potential in optoelectronic devices because of their tunable band gaps and facile colloidal synthesis, but they suffer from serious lead toxicity and instability. It is highly desirable to substitute lead with other elements to acquire nontoxic and environmentally friendly lead-free perovskite NCs for optoelectronic devices. Here, we report a general method for the colloidal synthesis of a series of bismuth/antimony-based halide perovskite NCs with various constituents and optical band gaps from 1.97 to 3.15 eV. In our proposed synthetic system, 1-dodecanol is adopted as the solvent instead of the conventionally used 1-octadecene to realize size controllability of bismuth/antimony-based metal halide perovskite NCs. It is found that 1-dodecanol can act as a surfactant to tightly adsorb on the surface of bismuth/antimony-based halide perovskite NCs, enabling their small sizes (∼2 nm) and high dispersibility. Simultaneously, the band gaps of bismuth/antimony-based halide (A3B2X9, where A = CH3NH3, Cs, or Rb, B = Bi or Sb, and X = Cl, Br, or I) perovskite NCs can be systematically tuned by the atomic substitution of A, B, or X lattice sites. Moreover, to show the optoelectronic application potential of these lead-free halide perovskite NCs, a solar cell based on colloidal Cs3Bi2I9 perovskite NCs is demonstrated. The developed colloidal synthesis of bismuth/antimony-based halide NCs in 1-dodecanol will offer an alternative route to fabricating lead-free halide perovskite optoelectronic devices.

Iron(III)-catalyzed aerobic oxidation for the synthesis of 1-benzoxazolyl-o-carboranes

Ji Wu,Ke Cao,Cai-Yan Zhang,Xin-Yu Wen,Bo Li,Junxiao Yang

A FeCl 3 catalyzed tandem condensation/cyclization/aerobic oxidation process for synthesis of 1-benzoxazolyl- o -carboranes has been developed. The degradation of o -carborane in the presence of aza-/oxa-nucleophiles was completely suppressed, and a series of 1-benzoxazolyl- o -carboranes, 1-benzothiazolyl- o -carborane and 1-benzimidazolyl- o -carborane have been synthesized with good to excellent yields. This work offers a general protocol for synthesis of 1-benzoxazolyl- o -carboranes, which has important reference for synthesis of aromatic heterocycle-carborane derivatives and promote its applications in miscellaneous areas.

Transcriptional analysis reveals that 1-methylcyclopropene treatment promotes anthocyanin synthesis in peach fruit

Xiaoqin Wu,Zhiyi Shan,Lufan Wang,Wenwei Shi,Yanyan Li,Hongfang Cai,Liang Zhou,Chen Huan

Anthocyanins are bioactive substances that are not only responsible for the pigmentation of various fruits, but also hold potential benefits to human health. In this study, postharvest peaches were treated with 10 ppm 1-MCP, and changes of anthocyanin biosynthesis were then revealed at transcriptional level to gain insight into the underlying molecular mechanisms. The functions of key transcription factors (TFs) were systematically analyzed. Results demonstrated that 1-MCP effectively up-regulated expression of structural genes and stimulated anthocyanin accumulation. A novel transcription factor PpbHLH135 can respond positively to 1-MCP treatment and has been noted for its remarkable gene expression and protein abundance. The transcription factor bHLH3 was also investigated in this study due to its widespread interest and attention, serving to compare the regulatory function of bHLH135 in anthocyanin synthesis, although it didn’t show a significant response to 1-MCP treatment in this study. PpbHLH3 TF showed a stronger regulatory effect on PpF3H , while PpbHLH135 was more dominant over the regulation of PpUFGT . Future genetic and molecular experimentation will elucidate whether PpbHLH135 TF, in combination with other TFs, can play a stronger regulating role in fruit pigmentation, or in other metabolic pathways.

DJ-1 suppresses ferroptosis through preserving the activity of S-adenosyl homocysteine hydrolase

Cao Ji,Chen Xiaobing,Jiang Li,Lu Bin,Yuan Meng,Zhu Difeng,Zhu Hong,He Qiaojun,Yang Bo,Ying Meidan

Ferroptosis is a newly characterized form of regulated cell death mediated by iron-dependent accumulation of lipid reactive oxygen species and holds great potential for cancer therapy. However, the molecular mechanisms underlying ferroptosis remain largely elusive. In this study, we define an integrative role of DJ-1 in ferroptosis. Inhibition of DJ-1 potently enhances the sensitivity of tumor cells to ferroptosis inducers both in vitro and in vivo. Metabolic analysis and metabolite rescue assay reveal that DJ-1 depletion inhibits the transsulfuration pathway by disrupting the formation of the S-adenosyl homocysteine hydrolase tetramer and impairing its activity. Consequently, more ferroptosis is induced when homocysteine generation is decreased, which might be the only source of glutathione biosynthesis when cystine uptake is blocked. Thus, our findings show that DJ-1 determines the response of cancer cells to ferroptosis, and highlight a candidate therapeutic target to potentially improve the effect of ferroptosis-based antitumor therapy.

Multifunctional gold nanoparticles as signal transducers for fabrication of 1:2 molecular demultiplexer

He Yi,Yu Haili

A label-free and enzyme-free demultiplexer system for the fabrication of 1:2 molecular demultiplexer with luminol functionalized gold nanoparticles (Lum-AuNPs) as signal transducers was developed for the first time. The Lum-AuNPs had both chemiluminescence (CL) activity and surface plasmon resonance property. It was found that organothiols (RSH) could easily induce the aggregation of AuNPs via strong Au–S covalent interactions in the absence of hydrogen peroxide (H 2 O 2 ), generating a red shift in the absorption band of AuNPs. However, the presence of H 2 O 2 would readily oxidize RSH to disulfide (RS-SR), and the aggregation of Lum-AuNPs did not occur due to lack of the sulfhydryl group. Meanwhile, H 2 O 2 could react with Lum-AuNPs, producing a strong CL emission owing to the enhancement effect of RSH on AuNPs-luminol-H 2 O 2 CL system. Thus, RSH, H 2 O 2 , absorbance ratio, and CL intensity served as the signal input, address input, and two different signal outputs of the 1:2 molecular demultiplexer, respectively.

Sol-Gel Synthesis and Characterization of (1–x–y)BiYbO3-xLiNbO3-yBaTiO3 Ceramics

Gang Chen,Chunyan Deng,Xiaodong Peng,Chunlin Fu,Wei Cai,Rongli Gao,Xiaoling Deng

Liquid—liquid equilibria of ternary systems of 1-hexene/hexane and extraction solvents

Lin Zhu,Fang-Fang Li,Ji-Qin Zhu,Zhi-Gang Lei

Olefins and paraffins are important basic chemical raw materials with so similar molecular structure and volatility that their separation is a difficult and energy-consuming process. Liquid–liquid equilibrium (LLE) data were determined for ternary systems of: 1-hexene + hexane + solvent at 25°C, 30°C, and 35°C, and N-formylmorpholine (NFM), N-methyl-2-pyrrolidone (NMP), 7-butyrolactone (GBL), and 1-methylimidazole (1-MEI) as the solvents studied. Liquid–liquid equilibrium data for each system were correlated to the NRTL (Non-Random Two Liquid) equation and the interaction parameters presented. The calculated results agree well with the experimental data.

Liquid Density and Viscosity of Ethyl Caprate/1-Propanol Mixture at High Pressures

Xiaopo Wang,Heyu Jia,Xiaojie Wang,Feridun Esmaeilzadeh

The liquid densities and viscosities of ethyl caprate/1-propanol mixture were investigated at ethyl caprate molar fractions of 0.25, 0.50, and 0.75 in this work. The measurements were carried out using a vibrating-tube densimeter and a falling-cylinder viscometer, and the studied temperature range was from 293 to 363 K, and the pressure was up to 60 MPa for density and 30 MPa for viscosity. The Tait equation was used to correlate the experimental densities. In addition, for comparison purpose, the modified Andrade equation and the Vogel–Fulcher–Tammann (VFT) equation were used to correlate the viscosities. For the density and viscosity of the mixtures at different molar fractions, the average absolute relative deviations between experimental and calculated values are all less than 0.01 and 0.47%, respectively.

Electroacupuncture Alleviates Obesity and Insulin Resistance via the GLP-1-VTADA Reward Circuit

Zhu Ye,Tian Jun,Wei Xiali,Jia Shaohui,Shu Qing

Introduction: We investigated the effects of electroacupuncture (EA) on improving obesity and insulin resistance (IR) in high-fat diet-induced (HFDI) obese rats by modulating the nucleus tractus solitarius (NTS) glucagon-like peptide-1 (GLP-1)-ventral tegmental area (VTA) dopamine (DA) neural reward circuit, thereby uncovering a possible central mechanism underlying EA’s actions in improving obesity and IR. Methods: We randomly allocated 45 Wistar male rats to five groups (normal, model, EA, chemogenetic activation, chemogenetic suppression + EA), with 9 rats in each group. All interventions were conducted within 8 weeks after the model was established. We tested rats for obesity phenotypes included body mass, Lee’s index, 24-h food intake, and glucose-metabolism parameters. We observed protein and gene expression for GLP-1 in the NTS and tyrosine hydroxylase in the VTA by Western blotting and real-time polymerase chain reaction, as well as their localization by immunofluorescence. We also determined the DA content in the VTA using high-performance liquid chromatography. Results: Obese rats exhibited marked hyperphagia, accompanied by increased excitability of DA neurons in the VTA region and reduced insulin sensitivity. After EA treatment, obese rats showed augmented excitability of NTS GLP-1 and suppression of VTADA neurons with a diminution in food intake, showing results similar to those in the chemogenetic activation group. After EA treatment and while inhibiting GLP-1 neurons by chemogenetics, the effect of EA on activating GLP-1 neurons and inhibiting VTADA was partially abrogated. The effects of improving obesity and insulin sensitivity were likewise also suppressed. Conclusion: EA effectively activated GLP-1 neurons in the NTS, thereby inhibited the expression of DA in the VTA and improved obesity and insulin sensitivity in HFDI-obese rats

H2O2 signaling modulates Glycoprotein-1 induced programmed cell death in tobacco suspension cells

Yubo Sun,Xiangrong Tian,Hao Wu,Xinchang Hao,Baowei Gao,Hongyan Zhang,Juntao Feng,Lirong Han

Glycoprotein (GP)-1 is a glycoprotein elicitor with antiviral activity found in Streptomyces kanasensis zx01. GP-1 can induce programmed cell death (PCD) in vitro; however, the underlying mechanism is unclear. In the present study, we demonstrated that GP-1 induced PCD in tobacco suspension cells, which was modulated by hydrogen peroxide (H 2 O 2 ). GP-1 participated in and modulated biologically relevant signaling in plant cells. GP-1 induced tobacco cell death in a dose- and time-dependent manner; affected the expression of BRI1-associated receptor kinase 1 (BAK1) and the accumulation of salicylic acid (SA), which are related to PCD; and enzymatic activities and mitochondrial functions. In conclusion, GP-1-induced PCD in tobacco may be mediated by H 2 O 2 which alters BAK1 and SA levels, as well as mitochondrial and gene function. This cell signal cascade played an important role in the process of GP-1 induced plant disease resistance .