104results about How to "Experimental conditions are easy to achieve" patented technology

The invention discloses a multiferroic Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3-NiFe2O4 composite film and a preparation method thereof. The composite film comprises a Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3 crystalline state film and a NiFe2O4 crystalline state film which are compounded together. The preparation method comprises the following steps: respectively preparing a Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3 precursor solution and a NiFe2O4 precursor solution; and spinning on a substrate to prepare a multilayer NiFe2O4 film, and spinning on the NiFe2O4 film to prepare a multilayer Bi0.96-xSr0.04RExFe0.94Mn0.04Cr0.02O3 film, thereby obtaining the target product. The equipment requirement is simple, the prepared film is high in uniformity, the doping amount is easy to control, and the ferroelectric properties and ferromagnetic properties of the film are greatly improved. Meanwhile, the leakage current density of the film is effectively reduced.

The invention discloses an mpg-C3N4/BiPO4 compound photocatalyst and a preparing method and application thereof. The preparing method includes the steps that with melamine serving as a raw material, mpg-C3N4 powder is synthesized through a hard template method; with Bi(NO3)3.5H2O and Na3PO4.12H2O serving as raw materials, BiPO4 powder is synthesized through a microwave hydrothermal method; the mpg-C3N4 powder is put into ethyl alcohol to be dispersed ultrasonically, then the BiPO4 powder is added, ultrasonic dispersion continues, after dispersion is completed, the mixture is stirred for a period of time continuously, and the obtained product is washed and dried to obtain the mpg-C3N4/BiPO4 compound photocatalyst. The process of the preparing method is simple and easy to control, the requirement for equipment is low, experiment conditions can be reached easily, cost is low, and the prepared mpg-C3N4/BiPO4 compound photocatalyst has excellent photocatalytic performance, can be used for degrading organics and environmental pollutants and has wide application prospects.

The invention discloses a method for preparing a Bi0.85Sm0.15Fe1-xCrxO3 ferroelectric film via a sol-gel process. The method is carried out by the following steps of: washing an FTO (Fluorinedoped Tin Oxide) substrate and subsequently irradiating via ultraviolet light; using bismuth nitrate, ferric nitrate, samarium nitrate and chromic nitrate as raw materials (the bismuth nitrate excesses by 5%), dissolving the above raw materials in mixed ethylene glycol monomethyl ether and acetic anhydride according to a mole ratio of 0.90: (1-x):0.15:x (x is 0.00, 0.01, 0.02 or 0.03), then adding ethanol amine to adjust a viscosity and obtain a stable BiFeO3 (bismuth ferrite) precursor solution with a metal ion concentration of 0.003-0.3mol/L; and homogenizing and subsequently obtaining a dry film, then using a layer-by-layer annealing process to obtain a crystal-state Bi0.85Sm0.15Fe1-xCrxO3 ferroelectric film. The method disclosed by the invention has the advantages of simple device requirement, easy achievement of experiment condition, good uniformity of the prepared films and easy control of the doping amount, so that the ferroelectric performance of the film is greatly enhanced.

The invention provides a method for preparing a Gd and Co codoped high-remanent-polarization BiFeO3 thin film by a sol-gel method. The method comprises the steps that Bi(NO3)3*5H2O, Fe(NO3)3*9H2O, Gd(NO3)3*6H2O and Co(NO3)2*6H2O are dissolved in ethylene glycol monomethyl ether, and then heated and stirred in an 80 DEG C water bath for 1h; acetic anhydride is added and stirred for 1h; a BiFeO3 precursor solution is obtained and stands for 24h; an FTO (Fluorinedoped Tin Oxide)/glass substrate is subjected to spin coating with the BiFeO3 precursor solution for preparing a thin film; the thin film is subjected to rapid annealing at 550 DEG C, and then cooled to a room temperature; and spin coating and rapid annealing processes are repeated till the BiFeO3 thin film with the required thickness is prepared. The adopted sol-gel method does not require expensive equipment, and is suitable for preparing the thin film on a large surface and a surface with an irregular shape; in addition, chemical constituents are precise and controllable; the ferroelectric property of the prepared BiFeO3 thin film is improved under coaction of Gd and Co.

The invention discloses a layer-by-layer alternatively doped low-leakage-current BiFeO3 film and a preparation method thereof. The preparation method comprises the steps of dissolving bismuth nitrate, ferric nitrate and nitric acid into mixed liquid of ethylene glycol monomethyl ether and acetic anhydride so as to obtain a precursor solution A; dissolving bismuth nitrate, ferric nitrate and samarium nitrate in mixed liquid of ethylene glycol monomethyl ether and acetic anhydride so as to obtain a precursor solution B; coating the precursor solution A on a FTO/glass substrate by way of spin coating, baking and annealing the FTO/glass substrate so as to obtain a Tb doped crystalline BiFeO3 film, coating the precursor solution B on the Tb doped crystalline BiFeO3 film by way of spin coating, baking and annealing the Tb doped crystalline BiFeO3 film so as to obtain a Sm doped crystalline BiFeO3 film, and alternatively preparing the Tb doped crystalline BiFeO3 film and the Sm doped crystalline BiFeO3 film on the Sm doped crystalline BiFeO3 film so as to obtain the layer-by-layer alternatively doped low-leakage-current BiFeO3 film. The method disclosed by the invention adopts a sol-gel process, and is simple in equipment requirements and suitable for preparing films on large surfaces and irregularly-shaped surfaces, and chemical components are precise and controllable.

The invention provides a Bi0.90Er0.10Fe0.96Co0.02Mn0.02O3/Mn(1-x)CoxFe2O4 composite film and a preparation method thereof. The composite film comprises a Bi0.90Er0.10Fe0.96Co0.02Mn0.02O3 crystalline-state film and a Mn(1-x)CoxFe2O4 crystalline-state film which are compounded together. The preparation method comprises the following steps: respectively preparing a Bi0.90Er0.10Fe0.96Co0.02Mn0.02O3 precursor solution and a Mn(1-x)CoxFe2O4 precursor solution; then spinning on a substrate to prepare a multi-layer Mn(1-x)CoxFe2O4 film; and spinning on the Mn(1-x)CoxFe2O4 film to prepare a multi-layer Bi0.90Er0.10Fe0.96Co0.02Mn0.02O3 film which is the target product. In the invention, the equipment requirements are simple, the prepared film has relatively good uniformity, the doping amount is easy to control, the ferroelectric property and ferromagnetic property of the film are remarkably improved, and the leak current density of the film is effectively reduced at the same time.

The invention discloses a multiferroic Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3-CuFe2O4 composite film and a preparation method thereof. The composite film comprises Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3 crystal films and CuFe2O4 crystal films which are composited together. The preparation method comprises the following steps: firstly, preparing a Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3 precursor solution and a CuFe2O4 precursor solution respectively; secondly, preparing multiple layers of CuFe2O4 films on a substrate by spin coating, and preparing multiple layers of Bi(0.98-x)Sr0.02RExFe0.97Mn0.03O3 films on the CuFe2O4 films by spin coating to obtain a target product. The equipment requirement is simple, the uniformity of the prepared film is high, the doping amount is easy to control, the ferroelectric and ferromagnetic properties of the film are improved, and the leakage current density of the film is effectively reduced.

The invention provides a Bi0.9Er0.1Fe1-xCoxO3 film with high ferromagnetism and ferroelectricity, and a making method thereof. The method comprises the following steps: preparing a Bi0.9Er0.1Fe1-xCoxO3 precursor solution from bismuth nitrate, iron nitrate, cobalt nitrate and erbium nitrate, spin-coating a substrate with the Bi0.9Er0.1Fe1-xCoxO3 (x is 0.01-0.03) precursor solution, uniformly sizing, drying, and annealing to obtain the Bi0.9Er0.1Fe1-xCoxO3 film with high ferromagnetism and ferroelectricity. The method has the advantages of simple device requirements, easy reaching of experiment conditions, easy control of the doping amount, and great improvement of the ferromagnetism of a BiFeO3 film, and the Bi0.9Er0.1Fe1-xCoxO3 film made in the invention has the advantages of good uniformity, high magnetic intensity and high remanent polarization.

The invention discloses a Bi0.92Ho0.08Fe0.97Mn0.03O3-Zn1-xNixFe2O4 multiferroic composite film and a preparation method thereof. The composite film comprises a Bi0.92Ho0.08Fe0.97Mn0.03O3 crystalline film and a Zn1-xNixFe2O4 crystalline film, which are compounded together. The method comprises the following steps: firstly, respectively preparing a Bi0.92Ho0.08Fe0.97Mn0.03O3 polymeric precursor solution and a Zn1-xNixFe2O4 precursor solution during preparation; spinning on a substrate, and preparing a multi-layer Zn1-xNixFe2O4 film; and spinning on the Zn1-xNixFe2O4 film and preparing a multi-layer Bi0.92Ho0.08Fe0.97Mn0.03O3-Zn1-xNixFe2O4 film, so as to obtain a target product. The method disclosed by the invention is simple in demands on equipment; the prepared film is good in uniformity; the doping amount is easy to control; the ferroelectric properties and the ferromagnetic properties of the film are improved; and meanwhile, the leakage current density of the film is effectively reduced.

The present invention relates to a preparation method and an application of hollow tin alloy nanoparticles with a particle size of less than 50 nm. The preparation method comprises: preparing a stannous sulfate solution with a concentration of 0.01-0.04 g/ml, weighing polyvinylpyrrolidone, and adding to the stannous sulfate solution to form a solution A; preparing a sodium borohydride aqueous solution with a concentration of 0.002-0.008 g/ml to obtain a solution B; adding the solution A to the solution B in a dropwise manner to obtain black particles; and preparing a copper chloride dehydrated alcohol solution C with a concentration of 0.0015-0.006 g/ml, adding the prepared tin nanoparticles to the solution C, carrying out water bath heating to achieve a temperature of 60-80 DEG C, and carrying out a reaction for 2-5 h under a N2 protection condition. According to the present invention, the prepared hollow tin alloy nanoparticles have a particle size of less than 50 nm, and have a uniform particle size, the experiment method is simple, experiment conditions are easy to achieve, and the nanometer material can be used for lithium ion battery negative electrode materials.

The invention discloses a multiferroic Bi0.83Pr0.15Sr0.02Fe0.97-xMn0.03CuxO3-CuFe2O4 composite film and a preparation method thereof. The composite film comprises a Bi0.83Pr0.15Sr0.02Fe0.97-xMn0.03CuxO3 (x=0.01-0.05) crystalline film in the upper layer and a CuFe2O4 crystalline film in the lower layer. The preparation method comprises respectively preparing a Bi0.83Pr0.15Sr0.02Fe0.97-xMn0.03CuxO3 precursor solution and a CuFe2O4 precursor solution, carrying out spin-coating on a substrate with multiple CuFe2O4 films and carrying out spin-coating on the CuFe2O4 film with multiple Bi0.83Pr0.15Sr0.02Fe0.97-xMn0.03CuxO3 films to obtain the multiferroic Bi0.83Pr0.15Sr0.02Fe0.97-xMn0.03CuxO3-CuFe2O4 composite film. The preparation method has simple equipment requirements, can prepare the film with good uniformity, easily controls a doping amount, improves ferroelectric and ferromagnetic properties of the film and effectively reduces film leakage current density.

The invention discloses a high-molecular-weight soluble elementary sulfur/terpene copolymer, and a preparation method and an application of same. The preparation method includes the following steps: 1) heating elementary sulfur in nitrogen gas and a vulcanization accelerator until the elementary sulfur is fused completely, adding terpene, and uniformly mixing the components; 2) increasing temperature of the reaction system to 150-240 DEG C to perform a reaction for 0.5-6.0 h, and purifying a product to obtain a sulfur-rich oligomer; 3) dissolving the sulfur-rich oligomer and removing oxygen, adding an oxidant to perform a reaction at 20-80 DEG C for 0.5-8.0 h, and purifying the product to prepare the elementary sulfur/terpene copolymer. The invention, for the first time, discloses a process of synthesizing the high-molecular-weight soluble elementary sulfur/terpene copolymer from sulfur and terpene, and overcomes the defect that an elementary sulfur/terpene copolymer in the prior art is low in molecular weight and is limited in application. The raw materials in the invention are low in cost and easy to obtain; by means of the sulfur, resource waste is effectively avoided. The preparation method has simple processes, employs easy experimental conditions, and is high in reaction yield.

The invention relates to a B-site Mn and Cu codoped high remanent polarization BiFeO3 film and a preparation method, the method comprises the following steps: dissolving bismuth nitrate, ferric nitrate, manganese acetate and cupric nitrate according to mol ratio of 1.05: [(0.92-0.98)-x]: (0.02-0.08):x in a mixed liquor of ethylene glycol monomethyl ether and acetic anhydride, then uniformly stirring to obtain a BiFeO3 precursor; wherein total metal ion concentration of the BiFeO3 precursor is 0.1-0.5mol/L, X is 0.01-0.03; performing spin coating of the BiFeO3 precursor on a FTO/glass substrate to prepare a wet membrane, baking the wet membrane to obtain a dry membrane, then annealing at 550 DEG C to obtain the crystalline state BiFeO3 film; cooling the crystalline state BiFeO3 film, and repeatedly making the crystalline state BiFeO3 film to reach a required thickness to obtain the B-site Mn and Cu codoped high remanent polarization BiFeO3 film. According to the invention, a sol gel technology is employed, the equipment requirement is simple, the film is prepared on large surface and surfaces with irregular shapes, the chemical component is accurate and controllable, and the regulation and control to its crystal structure can be carried out by codoping thereby the ferroelectric performance of the film is greatly increased.

The invention provides a Bi1-xRExFeO3/CoFe2O4 multiferroic composite membrane and a preparation method thereof. The composite membrane comprises a Bi1-xRExFeO3 crystalline state membrane and a CoFe2O4 crystalline state membrane which are combined together, wherein RE is Ce, Pr, Tb, Eu or Yb, x is equal to 0.05-0.15; in the preparation, Bi1-xRExFeO3 precursor solution and CoFe2O4 precursor solution are firstly prepared respectively; and then, multi-layer CoFe2O4 membrane is prepared by spinning on a substrate, and the multi-layer Bi1-xRExFeO3 membrane is prepared by spinning on the CoFe2O4 membrane, so the target product is obtained. The facility request is simple, the homogeneity of the prepared membrane is good, the chemical composition can be accurately controlled, the doping content is easily controlled, and the ferroelectric property and ferromagnetic property of the membrane are greatly improved, so the Bi1-xRExFeO3/CoFe2O4 multiferroic composite membrane has high residual polarization value and residual magnetization value.

The invention provides a Bi[0.85-x]Pr0.15AExFe0.97Mn0.03O3 ferroelectric film and a preparation method thereof. The method comprises the following steps: preparing a Bi[0.85-x]Pr0.15AExFe0.97Mn0.03O3 precursor solution from bismuth nitrate, praseodymium nitrate, hydrogen nitrate AE, ferric nitrate and manganous nitrate, wherein AE is Sr, Ca or Ba, and x=0.02-0.05; spinning the precursor solution on a substrate; and then spinning, drying and annealing, so as to obtain the Bi[0.85-x]Pr0.15AExFe0.97Mn0.03O3 ferroelectric film. The Bi[0.85-x]Pr0.15AExFe0.97Mn0.03O3 ferroelectric film is simple in demands on equipment; the experiment condition is easy to achieve; the doping amount is easy to control; the ferroelectric property of the film can be greatly improved; and the prepared Bi[0.85-x]Pr0.15AExFe0.97Mn0.03O3 ferroelectric film is good in uniformity, low in leakage current, and low in coercive field, and has relatively high remanent polarization.

The invention provides a Bi[0.92-x]Ho0.08AExFe0.97Mn0.03O3 multiferroic film and a preparation method thereof. The method comprises the following steps: preparing a Bi[0.92-x]Ho0.08AExFe0.97Mn0.03O3 precursor solution from bismuth nitrate, holmium nitrate, nitric acid AE, ferric nitrate and manganese acetate, wherein AE is Ca, Ba or Sr, and x=0.01-0.08; spinning the precursor solution on a substrate; and then spinning, drying and annealing, so as to obtain the Bi[0.92-x]Ho0.08AExFe0.97Mn0.03O3 multiferroic film. The Bi[0.92-x]Ho0.08AExFe0.97Mn0.03O3 multiferroic film is simple in demands on equipment; the experiment condition is easy to achieve; the doping amount is easy to control; the ferroelectric property of the film can be greatly improved; and the prepared Bi[0.92-x]Ho0.08AExFe0.97Mn0.03O3 multiferroic film is good in uniformity, low in leakage current and low in coercive field, and has relatively high remanent polarization.

The invention discloses a light-driven shape-programmable MXene composite hydrogel driver and a preparation method thereof. The light-driven shape-programmable MXene composite hydrogel driver is formed by copolymerization of a polymerizable MXene nano monomer and thermosensitive PNIPAM hydrogel in-situ free radicals. The distribution of MXene and the anisotropy of a hydrogel network can be controlled by utilizing a low electric field, so that various biologically excited programmable anisotropic hydrogel drivers are developed by controlling an ITO electrode pattern, a direct-current electric field direction and mask-assisted ultraviolet polymerization. The invention provides a new development insight of a programmable and reconfigurable intelligent driver, and the intelligent driver can have application prospects in various fields.

The invention relates to a reinforced treatment method of a spring steel surface blueing coating, which comprises the following steps: carrying out deoiling treatment on spring steel, washing with hot water, washing with cold water, and blueing to obtain blued spring steel; and carrying out constant-potential polarization treatment on the blued spring steel, washing with hot water, washing with cold water, saponifying, flushing with water, drying, soaking in hot oil, and controlling oil. The electrochemical method is utilized to carrying out anodic polarization on the blueing coating to reinforce the blueing coating and fill up the film formation clearance, so that the blueing coating has higher corrosion resistance and wear resistance.

The invention discloses molybdate base samarium doped red fluorescent powder applicable to a white light LED. Molybdate serves as a substrate, the general chemical formula is Li3Sr2Gd(3-x)(MoO4)8: xSm3+, wherein x is bigger than or equal to 0.01 and smaller than or equal to 0.2, the molybdate base samarium doped red fluorescent powder applicable to the white light LED is prepared by doping an active ion Sm3+, the problems are solved that existing commercialized red fluorescent powder is poor in luminescence property and has serious light decay and instability and slaking does not occur easily, and the molybdate base samarium doped red fluorescent powder is stable in chemical property and good in color rendering; the invention further discloses a preparing method of the molybdate base samarium doped red fluorescent powder. The method comprises the steps of mixing and grinding Li2CO3, Sr2CO3, Gd2O3, MoO3 and Sm2O3, performing calcination under air atmosphere, conducting heat preservation, then conducting grinding after furnace cooling, and finally obtaining the molybdate base samarium doped red fluorescent powder applicable to the white light LED. The fluorescent powder is prepared based on solid-phase synthesis, the reproducibility is good, and the preparing period is short.