62 results about "1-octadecene" patented technology

The invention provides a preparation method of an ultrasmall NaYF4:Yb<3+>,Er<3+> upconversion nanoparticle luminescent material, which comprises the following steps: a) lowering the upconversion nanoparticle size by lowering the rare earth acetate concentration in the reactants or regulating the contents of oleic acid and 1-octadecene; and b) controlling the nucleating and crystallizing process by the repeated oscillation design of reaction temperature, thereby further lowering the upconversion nanoparticle size. The ultrasmall NaYF4:Yb<3+>,Er<3+> upconversion nanoparticles prepared by the method have the advantages of small size (9-18nm), uniform particle size distribution and high luminescence efficiency, and are a hexagonal phase; and the preparation method has very high repeatability and favorable application prospects.

The invention relates to the synthesis method of indium phosphide fluorescent quantum dots, which belongs to the fields of the nano-material preparation technology and the biological analysis and detection technology. The synthesis method is characterized in that the method can synthesize the biocompatible indium phosphide quantum dots by the wet method synthesis using 1-octadecene as the solvent, tetradecanoic fatty acid as the stabilizer, metal phosphide as the phosphor source and metal indium salt as the precursor. The synthesis method comprises the following steps: reacting the metal phosphide with a strong acid to generate phosphine, introducing the phosphine gas into the indium salt precursor solution, and reacting to obtain the indium phosphide quantum dots. The method has the advantages of simple operation, mild condition, low cost, high yield and adjustable emission spectrum of the indium phosphide fluorescent quantum dots, etc.

The invention provides a method for increasing quantum yield of an up-conversion nano material. The method for increasing quantum yield of the up-conversion nano material comprises the following steps: (1) by taking YCl3, NH4F and NaOH as main raw materials, and taking oleic acid and 1-octadecene as solvents, reacting at a high temperature for 30-240 minutes, washing, centrifuging and drying to obtain a core NaYF4; (2) by taking the core NaYF4, LnCl3 (Ln represents Y, Yb and Er), NH4F and NaOH as main raw materials, and taking oleic acid and 1-octadecene as solvents, reacting at a high temperature for 10-60 minutes, washing, centrifuging and drying to obtain a core-shell structure NaYF4@NaYF4:Yb, Er; and (3) by taking the core-shell structure NaYF4@NaYF4:Yb, Er, YCl3, NH4F and NaOH as main raw materials, and taking oleic acid and 1-octadecene as solvents, reacting at a high temperature for 10-60 minutes, washing, centrifuging and drying to obtain a core-shell structure NaYF4@NaYF4:Yb, Er@NaYF4 which is delta-doped NaYF4:Yb, Er. By adopting the method, the quantum yield of the NaYF4:Yb, Er is greatly increased; the method has important significance for expanding application of the NaYF4:Yb, Er to biomarkers, analysis and detection, fluorescence imaging and solar cells.

The invention discloses a continuous automated synthesis method of highly controllable quantum dots. The continuous automated synthesis method comprises: a perovskite quantum dot synthesis method: weighing 0.6 g of cesium carbonate CsCO3, 2.2 mL of oleic acid and 15 mL of 1-octadecene, carrying out mixing stirring heating until cesium carbonate completely reacts, weighing 2.5 mL of 1-octadecene, 0.18 mmol lead halide, 0.27 mL of oleylamine and 0.27 mL of oleic acid, heating to a temperature of 120 DEG C until the lead halide is completely dissolved, slowly injecting into a microfluidic reactorthrough a peristaltic pump and other devices according to a certain ratio within the same time, controlling the temperature and the temperature of a micro-reaction chamber, opening an external lightfield, and collecting the obtained perovskite quantum dot product; and a carbon quantum dot synthesis method: dissolving 1.46 g of lysine in 100 mL of distilled water, dissolving 1.76 g of ascorbic acid in 100 mL of distilled water, slowly injecting into a microfluidic reactor, heating to a temperature of 140 DEG C, opening an external field, and collecting the carbon quantum dot product solution,wherein the adjustability of the reaction time is ensured through the optimized pipeline design.

The invention provides a preparation method of a quantum dot semi-interpenetrating network lithium-sulfur battery composite cathode material. The preparation method comprises the following steps: dispersing aluminum isopropoxide, polyacrylamide and graphene in isopropanol, thus obtaining dispersed glue solution; mixing zinc acetate, oleic acid and 1-octadecene, injecting a sulfur source and performing reaction, adding a sulfur elemental substance and a carbon source, dispersing at a high speed, further cooling, cleaning with deionized water and drying, thus obtaining a quantum dot ZnS / S / C compound; and adding the quantum dot ZnS / S / C compound into the dispersed glue solution, stirring for 1-2 hours, then performing spray drying, and performing de-polycondensation on aluminum isopropoxide inpresence of water to obtain a semi-interpenetrating network ZnS / S / C compound formed by alumina sol and polyacrylamide gel, thus the quantum dot semi-interpenetrating network lithium-sulfur battery composite cathode material is obtained. The preparation method provided by the invention adds sulfur and carbon in a process that zinc sulfide quantum dots are formed, and quantum dot sulfide and the sulfur elemental substance are combined, so that full participation of sulfur in electrolyte reaction is guaranteed, polysulfide shuttling is prevented, and volume expansion deformation is effectively prevented.