6 results about "Dimethylformamide" patented technology

The invention provides a perovskite solar cell and a preparation method thereof. The perovskite solar cell comprises the steps of spin coating a ZnO precursor on the surface of a transparent conductive electrode to form an electron transport layer; Forming an absorbing layer on the electron transport layer, forming the absorbent layer comprises: PbI2 is dissolved in a mixed solution of dimethylformamide (DMF) and dimethyl sulfoxide (DMSO), then adding guanidine isothiocyanate, stirring and dissolving, then spin coating the mixed solution of PbI2 and guanidine isothiocyanate onto the electrontransport layer for first baking, then immersing in isopropyl alcohol (IPA) solution of CH3NH3I for second baking; forming a hole transport layer on the absorbing layer; A metal electrode is for on that hole transport layer. The perovskite solar cell provided by the invention optimizes the stability of the solar cell and improves the hysteresis effect of the solar cell.

The invention discloses an agent used for preventing and treating hawkmoth pests on impatiens balsamina L. The agent comprises the following components in parts by weight: 20-24 parts of 20% fenvalerate-fenitrothion emulsifiable concentrate, 10-16 parts of 70% trichlorphon, 8-12 parts of 50% fenitrothion emulsifiable concentrate, 4-7 parts of pepper powder, 3-6 parts of polyoxyethylene alkyl aryl ether, 3-5 parts of isopropyl phosphate, 5-8 parts of Turkey red oil, 3-7 parts of dimethylformamide, 2-3 parts of astragalus polysaccharide, 5-10 parts of vinegar, 3-6 parts of indigo naturalis, 3-6 parts of sodium fluosilicate and 40-50 parts of water. A use method comprises the following steps: proportionally allocating and mixing the components and stirring the components uniformly to obtain the agent for prevention and treatment; then spraying the agent around affected plants after diluting the agent for prevention and treatment. The agent has good prevention effects, is convenient to use, reduces the pesticide consumption, reduces environmental pollution and is beneficial to ecological balance.

The invention discloses preparation of a water-soluble metal-organic framework composite material and application thereof in detecting the concentration of fluorine ions in water. The preparation comprises the following steps of: preparing a urea solution; adding aluminum trichloride into ultrapure water, carrying out ultrasonic treatment until the aluminum trichloride is completely dissolved, adding 2-aminoterephthalic acid under a stirring condition, and stirring until the 2-aminoterephthalic acid is completely dissolved to obtain a mixed solution; slowly dropwise adding the urea solution into the mixed solution, and stirring to obtain a reaction solution; carrying out heat preservation after the reaction solution is heated, cooling, centrifuging, washing precipitates, and carrying out centrifugal separation to obtain a first product; and dispersing the first product into N, N-dimethylformamide, stirring, carrying out centrifugal separation to obtain a second product, dispersing thesecond product into methanol, stirring, carrying out centrifugal separation, and carrying out vacuum drying to obtain the water-soluble metal organic framework composite material. The composite material is used for detecting the fluorine ion concentration in water. The fluorescent probe prepared by the preparation method has a nanosheet microstructure, is easy to store, and has excellent solubility and good stability in water.

The invention discloses a method for anaerobic fermentation of organic household garbage of villages and small towns and particularly relates to a method for applying an ammonia nitrogen adsorption film material to an anaerobic fermentation process. A method for preparing the ammonia nitrogen adsorption film material comprises the following steps: firstly, preparing a FeZn Berlin blue compound, then, dissolving polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF), carrying out stirring until the PAN is completely dissolved, then, adding the FeZn Berlin blue compound, and continuing to carryout stirring and uniform dispersing, so as to obtain an electrostatic spinning solution; and adding the electrostatic spinning solution into an injector of an electrostatic spinning machine, and carrying out spinning, thereby obtaining a FeZn Berlin blue/polyacrylonitrile composite nano-fiber film. The composite nano-fiber film is high in adsorption capacity to ammonia nitrogen, stable in performance and simple in preparation method and has great potential applications to ammonia nitrogen adsorption and ammonia inhibition removal in the anaerobic fermentation process of the organic household garbage of the villages.

The invention relates to a method for preparing blue-shifting TiO2 microspheres. The method comprises the following steps: adding titanium sulfate in deionized water to obtain a solution A; adding urea in deionized water to obtain a solution B; slowly dripping the solution B in the solution A to obtain a solution C; mixing a dimethylformamide solution D and the solution C to obtain a solution E; transferring the solution E to a hydrothermal reaction kettle lined with Teflon, sealing the hydrothermal reaction kettle and then putting the sealed hydrothermal reaction kettle in a temperature-pressure-controlled microwave hydrothermal reaction instrument for preparation reaction in a temperature control mode, and carrying out natural cooling after the completion of reaction; and allowing the obtained white turbid liquid to stand, alternately washing the white turbid liquid with ethanol and deionized water, then carrying out centrifugal collection by taking absolute alcohol as the solvent, and drying to obtain the products, namely TiO2 microspheres. The microwave radiation heating method is adopted, the regular spherical blue-shifting TiO2 microspheres are further prepared in the high-temperature and high-pressure hydrothermal environment, and the blue-shifting TiO2 microspheres are 1-2 mum in diameter, 3.35 ev in forbidden bandwidth and better in dispersivity.