Hydrazine-assisted water electrolysis is a promising energy conversion technology for highly efficient hydrogen production.Rational design of bifunctional electrocatalysts,which can simultaneously accelerate hydrogen ...Hydrazine-assisted water electrolysis is a promising energy conversion technology for highly efficient hydrogen production.Rational design of bifunctional electrocatalysts,which can simultaneously accelerate hydrogen evolution reaction(HER)/hydrazine oxidation reaction(HzOR)kinetics,is the key step.Herein,we demonstrate the development of ultrathin P/Fe co-doped NiSe_(2) nanosheets supported on modified Ni foam(P/Fe-NiSe_(2)) synthesized through a facile electrodeposition process and subsequent heat treatment.Based on electrochemical measurements,characterizations,and density functional theory calculations,a favorable“2+2”reaction mechanism with a two-step HER process and a two-step HzOR step was fully proved and the specific effect of P doping on HzOR kinetics was investigated.P/Fe-NiSe_(2) thus yields an impressive electrocatalytic performance,delivering a high current density of 100 mA cm^(−2) with potentials of−168 and 200 mV for HER and HzOR,respectively.Additionally,P/Fe-NiSe_(2) can work efficiently for hydrazine-assisted water electrolysis and Zn-Hydrazine(Zn-Hz)battery,making it promising for practical application.展开更多
Utilizing the hydrazine-assisted water electrolysis for energy-efficient hydrogen production shows a promising application, which relies on the development and design of efficient bifunctional electrocatalysts. Herein...Utilizing the hydrazine-assisted water electrolysis for energy-efficient hydrogen production shows a promising application, which relies on the development and design of efficient bifunctional electrocatalysts. Herein, we reported a low-content Pt-doped Rh metallene(Pt-Rhene) for hydrazine-assisted water electrolysis towards energy-saving hydrogen(H_(2)) production, where the ultrathin metallene is constructed to provide enough favorable active sites for catalysis and improve atom utilization.Additionally, the synergistic effect between Rh and Pt can optimize the electronic structure of Rh for improving the intrinsic activity. Therefore, the required overpotential of Pt-Rhene is only 37 mV to reach a current density of-10 mA cm^(-2) in the hydrogen evolution reaction(HER), and the Pt-Rhene exhibits a required overpotential of only 11 mV to reach a current density of 10 mA cm^(-2) in the hydrazine oxidation reaction(HzOR). With the constructed HER-HzOR two-electrode system, the Pt-Rhene electrodes exhibit an extremely low voltage(0.06/0.19/0.28 V) to achieve current densities of 10/50/100 mA cm^(-2) for energy-saving H_(2) production, which greatly reduces the electrolysis energy consumption. Moreover,DFT calculations further demonstrate that the introduction of Pt modulates the electronic structure of Rh and optimizes the d-band center, thus enhancing the adsorption and desorption of reactant/intermediates in the electrocatalytic reaction.展开更多
Due to the properties and high reactivity of hydrazine,it is mainly used as rocket fuel not only in its pure form but also in combination with 1,1-dimethylhydrazine and oxidizers(nitrogen tetroxide or nitric acid)form...Due to the properties and high reactivity of hydrazine,it is mainly used as rocket fuel not only in its pure form but also in combination with 1,1-dimethylhydrazine and oxidizers(nitrogen tetroxide or nitric acid)forming a self-igniting mixture with oxidizers.Aerozine 50 and UH 25(a mixture of 75%UDMH(unsymmetrical dimethylhydrazine)and 25%hydrazine hydrate)are the best-known hydrazine mixtures with different hydrazine concentrations.The review addresses the use of hydrazine and its derivatives as fuel.Hydrazine is employed in fuel cells(with air oxygen as an oxidizer)to generate electrochemical energy for transport vehicles.Hydrazine is widely used as monopropellant to design low-thrust rocket engines for orientation and stabilization systems in space vehicles,as well as in energy units.The review also addresses such hydrazine derivatives as methylhydrazine,1,1-dimethylhydrazine,hydrazine monoperchlorate,hydrazine diperchlorate,hydrazine diammonium tetraperchlorate,hydrazine mononitrate,hydrazine dinitrate,hydrazine nitroformate,hydrazine azides,tetrafluorohydrazine,etc.as well as composite propellants,and gel rocket propellants based on hydrazine.The materials in the review can be used as reference information on hydrazine fuels.展开更多
The current study describes the application of a new extraction method for efficient uranium adsorption via cost-effective hydrazine-impregnated activated carbon.Various experimental parameters such as time, adsorbent...The current study describes the application of a new extraction method for efficient uranium adsorption via cost-effective hydrazine-impregnated activated carbon.Various experimental parameters such as time, adsorbent weight, temperature(°C), and uranium concentration were thoroughly investigated. The synthesized adsorbent was characterized via X-ray diffraction, Fourier transformation infrared spectroscopy(FT-IR), scanning electron microscopy, and thermogravimetric analysis. The results showed86% uranium extraction under optimized conditions(20% P2O5 at 25 °C, 120 min). The obtained findings fit well with thermodynamic and isothermal(Langmuir and Freundlich isotherms) models and pseudo second-order kinetics. In thermodynamic studies, the negative sign of(DG°) specified the spontaneity of process, the negative sign of(DH°) revealed endothermicity, and the positive sign of(DS°) showed high randomness after adsorption.展开更多
One-dimensional Ni nanostructures were synthesized via a hydrazine reduction route under external magnetic fields. The mixture of de-ionized water and ethanol was used as the reaction solvent and hydrazine hydrate as ...One-dimensional Ni nanostructures were synthesized via a hydrazine reduction route under external magnetic fields. The mixture of de-ionized water and ethanol was used as the reaction solvent and hydrazine hydrate as reducing agents. The morphology and properties of Ni nanostructures were characterized by X-ray diffractometer(XRD), scanning electron microscopy(SEM), and vibrating sample magnetometer(VSM). It was found that the magnetic field strength, concentration of Ni ions,reaction time and temperature as well as p H values played key roles on formation, microstructures and magnetic properties of Ni nanowires. The optimal wires have diameter of ~200 nm and length up to ~200 μm. And their coercivity is ~260 Oe, which is much larger than the commercial Ni powders of 31 Oe. This work presents a simple, low-cost, environment-friendly and large-scale production approach to fabricate one-dimensional magnetic materials. The resulting materials may have potential applications in conductive filters, magnetic sensors and catalytic agents.展开更多
In this research a novel nickel complex was used as electrocatalyst for electrooxidation of hydrazine.A nano-structured nickel-complex was electrodeposited on a bimetallic Au-Pt inorganic-organic hybrid nanocomposite ...In this research a novel nickel complex was used as electrocatalyst for electrooxidation of hydrazine.A nano-structured nickel-complex was electrodeposited on a bimetallic Au-Pt inorganic-organic hybrid nanocomposite modified electrode.The electrode possesses a three-dimensional(3D) porous network nanoarchitecture,in which the bimetallic Au-Pt NPs serving as metal nanoparticle based microelectrode ensembles are distributed in the matrix of interlaced 3,3′,5,5′-Tetramethylbenzidine(TMB) organic nanofibers(NFs).Surface structure and composition of the sensor was characterized by scanning electron microscopy.Electrocatalytic oxidation of hydrazine on the surface of modified electrode was investigated with cyclic voltammetry method.The results showed that the nickelcomplex films displayed excellent electrochemical catalytic activities towards hydrazine oxidation.The hydrodynamic amperometry at rotating modified electrode at constant potential versus reference electrode was used for detection of hydrazine.Under optimized conditions the calibration plots were linear in the concentration range of 0.2-85 μM and detection limit was found to be 0.1 μM.The modified electrode exhibited reproducible behavior and a high level stability during the electrochemical experiments,making it particularly suitable for the analytical purposes.展开更多
A systematic investigation of the graphene oxide composite reduced by either p-phenylenediamine oligomers or hydrazine hydrate was performed with field emission scanning electron microscopy,high resolution transmissio...A systematic investigation of the graphene oxide composite reduced by either p-phenylenediamine oligomers or hydrazine hydrate was performed with field emission scanning electron microscopy,high resolution transmission electron microscopy,X-ray diffraction,fourier transform infrared,and X-ray photoelectron spectroscopy analyses.The electrical capacitance of the composite was evaluated by a cyclic voltammetry technique,while the properties of these prototype supercapacitors were measured by a chronopotentiometry technique.It was found that,under the solvothermal condition,the graphene oxide reduced by p-phenylenediamine oligomers was observed to have higher electrical capacitance than that reduced by hydrazine.The improved electrical capacitance can be attributed to that p-phenylenediamine oligomers are the more effective spacers for graphene layers;and they could also provide some pseudo-capacitance to the graphene oxide composite based on their conjugate structure.The results imply that graphene oxide modified by diamine oligomers has a good potential in energy storage devices.展开更多
SnO nanosheets and SnO_2 nanopowder were prepared by hydrazine (N_2H_4)-based chemical routes and their gas sensing characteristics were investigated.A SnCl_2-Hydrazine complex (Sn[ N_2H_4)_x]·yH_2O) was formed ...SnO nanosheets and SnO_2 nanopowder were prepared by hydrazine (N_2H_4)-based chemical routes and their gas sensing characteristics were investigated.A SnCl_2-Hydrazine complex (Sn[ N_2H_4)_x]·yH_2O) was formed by a reaction between a SnCl_2 aqueous solution and N_2H_4·H_2O.When this complex was heat-treated at 450℃,SnO_2 nanopowders were prepared by the decomposition of the complex.The sensor fabricated from the SnO_2 nano powders showed a good recovery,fast response and high sensitivity for CO 50μg/g (R_a/R_g=1.87),C_2H_5OH 100μg/g (R_a/R_g=4.80),and acetone 100μg/g (R_a/R_g=1.50).SnO nano- sheets could be prepared when a NaOH solution was added to the solution containing the complex.SnO_2 nano sheets prepared by the oxidation of SnO nanosheets at 700℃in air atmosphere also showed a good sensitivity R_a/R_g=1.79) for CO 50μg/g at 400℃.The hydrazine method provided an effective tool to controlling the morphology and oxidation state of the tin oxide powders.展开更多
A hydrogen evolution-assisted one-pot aqueous approach was developed for facile synthesis of trimetallic Pd Ni Ru alloy nanochain-like networks(Pd Ni Ru NCNs) by only using KBH_4 as the reductant, without any specific...A hydrogen evolution-assisted one-pot aqueous approach was developed for facile synthesis of trimetallic Pd Ni Ru alloy nanochain-like networks(Pd Ni Ru NCNs) by only using KBH_4 as the reductant, without any specific additive(e.g. surfactant, polymer, template or seed). The products were mainly investigated by transmission electron microscopy(TEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The hierarchical architectures were formed by the oriented assembly growth and the diffusioncontrolled deposition in the presence of many in-situ generated hydrogen bubbles. The architectures had the largest electrochemically active surface area(ECSA) of 84.32 m^2 g^(–1) Pdthan Pd Ni nanoparticles(NPs,65.23 m^2 g^(–1) Pd), Pd Ru NPs(23.12 m^2 g^(–1) Pd), Ni Ru NPs(nearly zero), and commercial Pd black(6.01 m^2 g^(–1) Pd), outperforming the referenced catalysts regarding the catalytic characters for hydrazine oxygen reaction(HOR). The synthetic route provides new insight into the preparation of other trimetallic nanocatalysts in fuel cells.展开更多
Combined with flow-injection (Fl) technology, a simple chemiluminescence(CL)method was developed for hydrazine determination in this paper. It was found that hydrazine could greatly decrease the strong CL signal prod...Combined with flow-injection (Fl) technology, a simple chemiluminescence(CL)method was developed for hydrazine determination in this paper. It was found that hydrazine could greatly decrease the strong CL signal produced by the reaction between luminol and hexacyanoferrate (Ⅲ) in alkaline medium. The decreased CL intensity was linear with hydrazine concentration in the range of 5.0× 10-9 gmL-1 to 4.0× 10-5 gmL1, and the limit of detection was 2.0× 10-9 g mL-1 (3σ) with a relative standard deviation of 2.4～4.1% (n=5).展开更多
Octa(aminophenyl)silsesquioxane (OAPS) was prepared from octaphenyl silsesquioxane (OPS) in two steps, first nitration to obtain Octa(nitrophenyl)silsesquioxane (ONPS) then reduction by using the stable, inexpensive, ...Octa(aminophenyl)silsesquioxane (OAPS) was prepared from octaphenyl silsesquioxane (OPS) in two steps, first nitration to obtain Octa(nitrophenyl)silsesquioxane (ONPS) then reduction by using the stable, inexpensive, and readily available hydrazine hydrate as the reducing agent in the presence of Iron(III)Chloride catalyst with a yield of around 87%. Hydrazine is a two-electron reducing agent whereas nitro group is a four-electron reduction process. The activated carbon serves as an adsorbent and electrical conductor enabling the reaction to occur by acting as a mediator between a two-electron reagent and a four-electron process. Adsorption provides a reducing potential and a supply of electrons from many hydrazines making possible the initial four-electron process even though each individual hydrazine is a two-electron donor. The product was characterized by FTIR and 1H NMR. The time period for preparation of ONPS from octaphenyl silsesquioxane was considerably shortened to avoid double nitration of the aromatic rings.展开更多
In this work we synthesized new derivatives from Phenyl Hydrazine and series of different Aldehydes (derivatives of benzylidenes). The synthesized compounds contain different aromatic Aldehydes which attached by Benze...In this work we synthesized new derivatives from Phenyl Hydrazine and series of different Aldehydes (derivatives of benzylidenes). The synthesized compounds contain different aromatic Aldehydes which attached by Benzene ring via Hydrazine moiety in glacial acetic acid. These derivatives were characterized by TLC, melting points, Infrared Red, Proton Nuclear Magnetic Resonance, Carbon Thirteen Nuclear Magnetic Resonance and Mass Spectroscopy. Finally, these synthesized derivatives were tested for antiproliferative activity against multiple normal and cancerous cell lines, HepG2 (Liver cancer) and MCF-7 (Breast cancer) cell lines were used for cytotoxic assay.展开更多
The phenyl and methyl phenyl free radicals,formed inthe oxidation-hydrolysis process of N’-acyl-N-phenylhydrazine,have been studied by ESR spectrometry.It was found that the freeradical is the chief cause which produ...The phenyl and methyl phenyl free radicals,formed inthe oxidation-hydrolysis process of N’-acyl-N-phenylhydrazine,have been studied by ESR spectrometry.It was found that the freeradical is the chief cause which produces the feed-back inhibitioneffect in the hydrazine-promoted infectious development of silverhalide.展开更多
A new method of preparing electrical conductive molybdenumoxide by thermal decomposition from hydrazine-containing molybdenum saltwas described.The process of the thermal decomposition of hydrazine-containing molybdem...A new method of preparing electrical conductive molybdenumoxide by thermal decomposition from hydrazine-containing molybdenum saltwas described.The process of the thermal decomposition of hydrazine-containing molybdemum salt was investigated by thermal analysis(TG and DTA)and the thermally decomposed product was studied by S.E.M.and chemicalanalysis.The result indicated that the molybdenum oxide obtained in thisway was electrical conductive.展开更多
A new method of preparing V<sub>2</sub>O<sub>3</sub> by thermal decomposition from hydrazine-containing vanadium salt was described. The process was investigated by thermal analysis （TG and DS...A new method of preparing V<sub>2</sub>O<sub>3</sub> by thermal decomposition from hydrazine-containing vanadium salt was described. The process was investigated by thermal analysis （TG and DSC） and the thermally decomposed product was studied by S.E.M., chemical analysis and X-ray diffraction. The result indicated that the product obtained in this way was V<sub>2</sub>O<sub>3</sub>.展开更多
A new method for preparing fine -Al<sub>2</sub>O<sub>3</sub> by thermal decompositionfrom hydrazine-containing aluminum salt was described.The process of thethermal decomposition of the hydrazi...A new method for preparing fine -Al<sub>2</sub>O<sub>3</sub> by thermal decompositionfrom hydrazine-containing aluminum salt was described.The process of thethermal decomposition of the hydrazine-containing aluminum salt wasinvestigated by thermal analysis（TG and DTA）and the thermally decomposedproducts were studied by S.E.M and X-ray diffraction.The result indicatedthe particles of -Al<sub>2</sub>O<sub>3</sub> obtained in this way at 12500℃ were【1um in size.展开更多
Objective:To evaluate new compounds synthesized by integrating quinoline,quinazoline,and acridine rings with the active moiety of(5-nitroheteroaryl)methylene hydrazine.Methods:A new series of compounds(1a,1b,2a,2b,3a,...Objective:To evaluate new compounds synthesized by integrating quinoline,quinazoline,and acridine rings with the active moiety of(5-nitroheteroaryl)methylene hydrazine.Methods:A new series of compounds(1a,1b,2a,2b,3a,and 3b)were synthesized and evaluated for cytotoxicity against COS-7 cells using the MTT assay.In vitro anti-plasmodial activity of the compounds was measured against CQ-sensitive(3D7)and CQ-resistant(K1)Plasmodium(P.)falciparum strains.β-hematin assay was performed to assess the inhibitory effects ofβ-hematin formation for new compounds.Results:The synthetic compounds had anti-plasmodial activity against blood-stage of 3D7[IC50=(0.328-5.483)μM]and K1[IC50=(0.622-7.746)μM]strains of P.falciparum,with no cytotoxicity against COS-7 cells in effective doses.Compounds 1a,1b,and 2b were the most effective derivatives against P.falciparum 3D7 and K1 strains.Based on theβ-hematin assay,the inhibition ofβ-hematin formation is the main mechanism of the inhibitory effect of these compounds.Conclusions:The synthetic compounds could inhibit the erythrocytic stages of CQ-sensitive and resistant P.falciparum strains without toxicity towards mammalian cells.Compounds 1b,2a,and 2b had comparable anti-plasmodial activity against both CQ-sensitive(3D7)and resistant(K1)P.falciparum strains.These compounds may be promising lead structures for the development of new anti-malarial drugs.展开更多
In this study, solutions of hydrazine and its derivatives were irradiated using a pulsed electron beam to determine the half-reaction time of radiolysis. 3 D structures of the hydrazine derivatives were optimized, and...In this study, solutions of hydrazine and its derivatives were irradiated using a pulsed electron beam to determine the half-reaction time of radiolysis. 3 D structures of the hydrazine derivatives were optimized, and their energies were calculated using density functional theory with the B3 LYP method and 6-311 +(3 d, 3 p) basis set.For the first time, the 3 D quantitative structure-activity relationship(QSAR) equation describing the relationship between the hydrazine derivative structures and rate of radiolysis has been established using SPSS software.Pearson correlation analysis revealed a close correlation between the total energies of the molecules and half-reaction times. In the QSAR equation, Y =-7583.464 +54.687 X_1+94333.586 X_2,Y,X_1,and X_2 are the half-reaction time, total energy of the molecule, and orbital transition energy, respectively. The significance levels of the regression coefficients were 0.006 and 0.031, i.e., both less than 0.05. Thus, this model fully explains the relationship between hydrazine derivatives and β radiolysis stability.The results show that the total energy of the molecule and orbital transition energy are the main factors that influence the β radiolysis stability of these hydrazine derivatives.展开更多
The reaction of α-triazolyl-α, β-unsaturated ketones with phenyl hydrazine was studied. The result indicated that cyclization took place and new heterocyclic compounds of substituted 4,5-2H-pyrazoles were obtained,...The reaction of α-triazolyl-α, β-unsaturated ketones with phenyl hydrazine was studied. The result indicated that cyclization took place and new heterocyclic compounds of substituted 4,5-2H-pyrazoles were obtained, whose structures and conformation were characterized by 1H NMR, IR, MS, elemental analysis and X-ray diffraction.展开更多
基金supported by the National Natural Science Foundation of China(22179065,22111530112,21875118)the Tianjin Graduate Research and Innovation Project(2022BKY018)the Ph.D.Candidate Research Innovation Fund of NKU School of Materials Science and Engineering.
文摘Hydrazine-assisted water electrolysis is a promising energy conversion technology for highly efficient hydrogen production.Rational design of bifunctional electrocatalysts,which can simultaneously accelerate hydrogen evolution reaction(HER)/hydrazine oxidation reaction(HzOR)kinetics,is the key step.Herein,we demonstrate the development of ultrathin P/Fe co-doped NiSe_(2) nanosheets supported on modified Ni foam(P/Fe-NiSe_(2)) synthesized through a facile electrodeposition process and subsequent heat treatment.Based on electrochemical measurements,characterizations,and density functional theory calculations,a favorable“2+2”reaction mechanism with a two-step HER process and a two-step HzOR step was fully proved and the specific effect of P doping on HzOR kinetics was investigated.P/Fe-NiSe_(2) thus yields an impressive electrocatalytic performance,delivering a high current density of 100 mA cm^(−2) with potentials of−168 and 200 mV for HER and HzOR,respectively.Additionally,P/Fe-NiSe_(2) can work efficiently for hydrazine-assisted water electrolysis and Zn-Hydrazine(Zn-Hz)battery,making it promising for practical application.
基金financially supported by the National Natural Science Foundation of China (No. 21972126, 21978264, 21905250, and 22278369)the Natural Science Foundation of Zhejiang Province (No. LQ22B030012 and LQ23B030010)the China Postdoctoral Science Foundation (2021M702889)。
文摘Utilizing the hydrazine-assisted water electrolysis for energy-efficient hydrogen production shows a promising application, which relies on the development and design of efficient bifunctional electrocatalysts. Herein, we reported a low-content Pt-doped Rh metallene(Pt-Rhene) for hydrazine-assisted water electrolysis towards energy-saving hydrogen(H_(2)) production, where the ultrathin metallene is constructed to provide enough favorable active sites for catalysis and improve atom utilization.Additionally, the synergistic effect between Rh and Pt can optimize the electronic structure of Rh for improving the intrinsic activity. Therefore, the required overpotential of Pt-Rhene is only 37 mV to reach a current density of-10 mA cm^(-2) in the hydrogen evolution reaction(HER), and the Pt-Rhene exhibits a required overpotential of only 11 mV to reach a current density of 10 mA cm^(-2) in the hydrazine oxidation reaction(HzOR). With the constructed HER-HzOR two-electrode system, the Pt-Rhene electrodes exhibit an extremely low voltage(0.06/0.19/0.28 V) to achieve current densities of 10/50/100 mA cm^(-2) for energy-saving H_(2) production, which greatly reduces the electrolysis energy consumption. Moreover,DFT calculations further demonstrate that the introduction of Pt modulates the electronic structure of Rh and optimizes the d-band center, thus enhancing the adsorption and desorption of reactant/intermediates in the electrocatalytic reaction.
文摘Due to the properties and high reactivity of hydrazine,it is mainly used as rocket fuel not only in its pure form but also in combination with 1,1-dimethylhydrazine and oxidizers(nitrogen tetroxide or nitric acid)forming a self-igniting mixture with oxidizers.Aerozine 50 and UH 25(a mixture of 75%UDMH(unsymmetrical dimethylhydrazine)and 25%hydrazine hydrate)are the best-known hydrazine mixtures with different hydrazine concentrations.The review addresses the use of hydrazine and its derivatives as fuel.Hydrazine is employed in fuel cells(with air oxygen as an oxidizer)to generate electrochemical energy for transport vehicles.Hydrazine is widely used as monopropellant to design low-thrust rocket engines for orientation and stabilization systems in space vehicles,as well as in energy units.The review also addresses such hydrazine derivatives as methylhydrazine,1,1-dimethylhydrazine,hydrazine monoperchlorate,hydrazine diperchlorate,hydrazine diammonium tetraperchlorate,hydrazine mononitrate,hydrazine dinitrate,hydrazine nitroformate,hydrazine azides,tetrafluorohydrazine,etc.as well as composite propellants,and gel rocket propellants based on hydrazine.The materials in the review can be used as reference information on hydrazine fuels.
文摘The current study describes the application of a new extraction method for efficient uranium adsorption via cost-effective hydrazine-impregnated activated carbon.Various experimental parameters such as time, adsorbent weight, temperature(°C), and uranium concentration were thoroughly investigated. The synthesized adsorbent was characterized via X-ray diffraction, Fourier transformation infrared spectroscopy(FT-IR), scanning electron microscopy, and thermogravimetric analysis. The results showed86% uranium extraction under optimized conditions(20% P2O5 at 25 °C, 120 min). The obtained findings fit well with thermodynamic and isothermal(Langmuir and Freundlich isotherms) models and pseudo second-order kinetics. In thermodynamic studies, the negative sign of(DG°) specified the spontaneity of process, the negative sign of(DH°) revealed endothermicity, and the positive sign of(DS°) showed high randomness after adsorption.
基金support of the National Basic Research Program of China(No.2006CB300406)Shanghai Science and Technology Grant(No:0752nm015)+2 种基金National Natural Science Foundation of China(No.50730008,20504021)Natural Science Foundation of Shanghai(No.09ZR1414800)Shanghai Applied Materials Collaborative Research Program(No:09520714400)
文摘One-dimensional Ni nanostructures were synthesized via a hydrazine reduction route under external magnetic fields. The mixture of de-ionized water and ethanol was used as the reaction solvent and hydrazine hydrate as reducing agents. The morphology and properties of Ni nanostructures were characterized by X-ray diffractometer(XRD), scanning electron microscopy(SEM), and vibrating sample magnetometer(VSM). It was found that the magnetic field strength, concentration of Ni ions,reaction time and temperature as well as p H values played key roles on formation, microstructures and magnetic properties of Ni nanowires. The optimal wires have diameter of ~200 nm and length up to ~200 μm. And their coercivity is ~260 Oe, which is much larger than the commercial Ni powders of 31 Oe. This work presents a simple, low-cost, environment-friendly and large-scale production approach to fabricate one-dimensional magnetic materials. The resulting materials may have potential applications in conductive filters, magnetic sensors and catalytic agents.
基金the Islamic Azad University,Khorramabad Branch research for financial support
文摘In this research a novel nickel complex was used as electrocatalyst for electrooxidation of hydrazine.A nano-structured nickel-complex was electrodeposited on a bimetallic Au-Pt inorganic-organic hybrid nanocomposite modified electrode.The electrode possesses a three-dimensional(3D) porous network nanoarchitecture,in which the bimetallic Au-Pt NPs serving as metal nanoparticle based microelectrode ensembles are distributed in the matrix of interlaced 3,3′,5,5′-Tetramethylbenzidine(TMB) organic nanofibers(NFs).Surface structure and composition of the sensor was characterized by scanning electron microscopy.Electrocatalytic oxidation of hydrazine on the surface of modified electrode was investigated with cyclic voltammetry method.The results showed that the nickelcomplex films displayed excellent electrochemical catalytic activities towards hydrazine oxidation.The hydrodynamic amperometry at rotating modified electrode at constant potential versus reference electrode was used for detection of hydrazine.Under optimized conditions the calibration plots were linear in the concentration range of 0.2-85 μM and detection limit was found to be 0.1 μM.The modified electrode exhibited reproducible behavior and a high level stability during the electrochemical experiments,making it particularly suitable for the analytical purposes.
基金the University Innovation Research and Training Program(C201603050,C201703648,and C201803850)of China University of Mining and Technology,Beijing2018 University Student Entrepreneurship Practice Project。
文摘A systematic investigation of the graphene oxide composite reduced by either p-phenylenediamine oligomers or hydrazine hydrate was performed with field emission scanning electron microscopy,high resolution transmission electron microscopy,X-ray diffraction,fourier transform infrared,and X-ray photoelectron spectroscopy analyses.The electrical capacitance of the composite was evaluated by a cyclic voltammetry technique,while the properties of these prototype supercapacitors were measured by a chronopotentiometry technique.It was found that,under the solvothermal condition,the graphene oxide reduced by p-phenylenediamine oligomers was observed to have higher electrical capacitance than that reduced by hydrazine.The improved electrical capacitance can be attributed to that p-phenylenediamine oligomers are the more effective spacers for graphene layers;and they could also provide some pseudo-capacitance to the graphene oxide composite based on their conjugate structure.The results imply that graphene oxide modified by diamine oligomers has a good potential in energy storage devices.
文摘SnO nanosheets and SnO_2 nanopowder were prepared by hydrazine (N_2H_4)-based chemical routes and their gas sensing characteristics were investigated.A SnCl_2-Hydrazine complex (Sn[ N_2H_4)_x]·yH_2O) was formed by a reaction between a SnCl_2 aqueous solution and N_2H_4·H_2O.When this complex was heat-treated at 450℃,SnO_2 nanopowders were prepared by the decomposition of the complex.The sensor fabricated from the SnO_2 nano powders showed a good recovery,fast response and high sensitivity for CO 50μg/g (R_a/R_g=1.87),C_2H_5OH 100μg/g (R_a/R_g=4.80),and acetone 100μg/g (R_a/R_g=1.50).SnO nano- sheets could be prepared when a NaOH solution was added to the solution containing the complex.SnO_2 nano sheets prepared by the oxidation of SnO nanosheets at 700℃in air atmosphere also showed a good sensitivity R_a/R_g=1.79) for CO 50μg/g at 400℃.The hydrazine method provided an effective tool to controlling the morphology and oxidation state of the tin oxide powders.
基金financially supported by the Nation Natural Science Foundation of China(No.21475118)
文摘A hydrogen evolution-assisted one-pot aqueous approach was developed for facile synthesis of trimetallic Pd Ni Ru alloy nanochain-like networks(Pd Ni Ru NCNs) by only using KBH_4 as the reductant, without any specific additive(e.g. surfactant, polymer, template or seed). The products were mainly investigated by transmission electron microscopy(TEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The hierarchical architectures were formed by the oriented assembly growth and the diffusioncontrolled deposition in the presence of many in-situ generated hydrogen bubbles. The architectures had the largest electrochemically active surface area(ECSA) of 84.32 m^2 g^(–1) Pdthan Pd Ni nanoparticles(NPs,65.23 m^2 g^(–1) Pd), Pd Ru NPs(23.12 m^2 g^(–1) Pd), Ni Ru NPs(nearly zero), and commercial Pd black(6.01 m^2 g^(–1) Pd), outperforming the referenced catalysts regarding the catalytic characters for hydrazine oxygen reaction(HOR). The synthetic route provides new insight into the preparation of other trimetallic nanocatalysts in fuel cells.
文摘Combined with flow-injection (Fl) technology, a simple chemiluminescence(CL)method was developed for hydrazine determination in this paper. It was found that hydrazine could greatly decrease the strong CL signal produced by the reaction between luminol and hexacyanoferrate (Ⅲ) in alkaline medium. The decreased CL intensity was linear with hydrazine concentration in the range of 5.0× 10-9 gmL-1 to 4.0× 10-5 gmL1, and the limit of detection was 2.0× 10-9 g mL-1 (3σ) with a relative standard deviation of 2.4～4.1% (n=5).
文摘Octa(aminophenyl)silsesquioxane (OAPS) was prepared from octaphenyl silsesquioxane (OPS) in two steps, first nitration to obtain Octa(nitrophenyl)silsesquioxane (ONPS) then reduction by using the stable, inexpensive, and readily available hydrazine hydrate as the reducing agent in the presence of Iron(III)Chloride catalyst with a yield of around 87%. Hydrazine is a two-electron reducing agent whereas nitro group is a four-electron reduction process. The activated carbon serves as an adsorbent and electrical conductor enabling the reaction to occur by acting as a mediator between a two-electron reagent and a four-electron process. Adsorption provides a reducing potential and a supply of electrons from many hydrazines making possible the initial four-electron process even though each individual hydrazine is a two-electron donor. The product was characterized by FTIR and 1H NMR. The time period for preparation of ONPS from octaphenyl silsesquioxane was considerably shortened to avoid double nitration of the aromatic rings.
文摘In this work we synthesized new derivatives from Phenyl Hydrazine and series of different Aldehydes (derivatives of benzylidenes). The synthesized compounds contain different aromatic Aldehydes which attached by Benzene ring via Hydrazine moiety in glacial acetic acid. These derivatives were characterized by TLC, melting points, Infrared Red, Proton Nuclear Magnetic Resonance, Carbon Thirteen Nuclear Magnetic Resonance and Mass Spectroscopy. Finally, these synthesized derivatives were tested for antiproliferative activity against multiple normal and cancerous cell lines, HepG2 (Liver cancer) and MCF-7 (Breast cancer) cell lines were used for cytotoxic assay.
文摘The phenyl and methyl phenyl free radicals,formed inthe oxidation-hydrolysis process of N’-acyl-N-phenylhydrazine,have been studied by ESR spectrometry.It was found that the freeradical is the chief cause which produces the feed-back inhibitioneffect in the hydrazine-promoted infectious development of silverhalide.
文摘A new method of preparing electrical conductive molybdenumoxide by thermal decomposition from hydrazine-containing molybdenum saltwas described.The process of the thermal decomposition of hydrazine-containing molybdemum salt was investigated by thermal analysis(TG and DTA)and the thermally decomposed product was studied by S.E.M.and chemicalanalysis.The result indicated that the molybdenum oxide obtained in thisway was electrical conductive.
文摘A new method of preparing V<sub>2</sub>O<sub>3</sub> by thermal decomposition from hydrazine-containing vanadium salt was described. The process was investigated by thermal analysis （TG and DSC） and the thermally decomposed product was studied by S.E.M., chemical analysis and X-ray diffraction. The result indicated that the product obtained in this way was V<sub>2</sub>O<sub>3</sub>.
文摘A new method for preparing fine -Al<sub>2</sub>O<sub>3</sub> by thermal decompositionfrom hydrazine-containing aluminum salt was described.The process of thethermal decomposition of the hydrazine-containing aluminum salt wasinvestigated by thermal analysis（TG and DTA）and the thermally decomposedproducts were studied by S.E.M and X-ray diffraction.The result indicatedthe particles of -Al<sub>2</sub>O<sub>3</sub> obtained in this way at 12500℃ were【1um in size.
基金supported by the grant(No.852)from Pasteur Institute of Iran to A.A.Mehrizi
文摘Objective:To evaluate new compounds synthesized by integrating quinoline,quinazoline,and acridine rings with the active moiety of(5-nitroheteroaryl)methylene hydrazine.Methods:A new series of compounds(1a,1b,2a,2b,3a,and 3b)were synthesized and evaluated for cytotoxicity against COS-7 cells using the MTT assay.In vitro anti-plasmodial activity of the compounds was measured against CQ-sensitive(3D7)and CQ-resistant(K1)Plasmodium(P.)falciparum strains.β-hematin assay was performed to assess the inhibitory effects ofβ-hematin formation for new compounds.Results:The synthetic compounds had anti-plasmodial activity against blood-stage of 3D7[IC50=(0.328-5.483)μM]and K1[IC50=(0.622-7.746)μM]strains of P.falciparum,with no cytotoxicity against COS-7 cells in effective doses.Compounds 1a,1b,and 2b were the most effective derivatives against P.falciparum 3D7 and K1 strains.Based on theβ-hematin assay,the inhibition ofβ-hematin formation is the main mechanism of the inhibitory effect of these compounds.Conclusions:The synthetic compounds could inhibit the erythrocytic stages of CQ-sensitive and resistant P.falciparum strains without toxicity towards mammalian cells.Compounds 1b,2a,and 2b had comparable anti-plasmodial activity against both CQ-sensitive(3D7)and resistant(K1)P.falciparum strains.These compounds may be promising lead structures for the development of new anti-malarial drugs.
文摘In this study, solutions of hydrazine and its derivatives were irradiated using a pulsed electron beam to determine the half-reaction time of radiolysis. 3 D structures of the hydrazine derivatives were optimized, and their energies were calculated using density functional theory with the B3 LYP method and 6-311 +(3 d, 3 p) basis set.For the first time, the 3 D quantitative structure-activity relationship(QSAR) equation describing the relationship between the hydrazine derivative structures and rate of radiolysis has been established using SPSS software.Pearson correlation analysis revealed a close correlation between the total energies of the molecules and half-reaction times. In the QSAR equation, Y =-7583.464 +54.687 X_1+94333.586 X_2,Y,X_1,and X_2 are the half-reaction time, total energy of the molecule, and orbital transition energy, respectively. The significance levels of the regression coefficients were 0.006 and 0.031, i.e., both less than 0.05. Thus, this model fully explains the relationship between hydrazine derivatives and β radiolysis stability.The results show that the total energy of the molecule and orbital transition energy are the main factors that influence the β radiolysis stability of these hydrazine derivatives.
文摘The reaction of α-triazolyl-α, β-unsaturated ketones with phenyl hydrazine was studied. The result indicated that cyclization took place and new heterocyclic compounds of substituted 4,5-2H-pyrazoles were obtained, whose structures and conformation were characterized by 1H NMR, IR, MS, elemental analysis and X-ray diffraction.
