7 results about "Silver acetate" patented technology

The invention discloses a chitosan-based membrane as well as a preparation method and application thereof, and belongs to the technical field of packaging materials. The chitosan-based film has a double-layer structure consisting of an inner layer and an outer layer, the outer layer is a water-blocking antibacterial layer formed by a silver complex, and the inner layer is an antibacterial antioxidant layer formed by polyphenol; the silver complex is a complex which is formed by the reaction of pyrrole-2-formaldehyde-g-chitosan and silver acetate; the polyphenol is formed by grafting 3, 4-dihydroxy methyl phenylacetate on the chitosan. The silver complex water-blocking antibacterial layer is constructed on the outer layer, and the polyphenol antibacterial anti-oxidation layer is constructed on the inner layer, so that the double fresh-keeping mechanism of external protection and internal maintenance is realized, and the comprehensive performance and application potential of the material are remarkably improved.

The application belongs to the technical field of chemical synthesis, and particularly relates to a synthesis method of 2-aryl-2-cyclohexanedione enol ester compounds. The method uses a transition metal complex as a catalyst, and uses a phenyl boronic acid compound and an iodine onium compound as raw materials, first synthesizes a 3-hydroxy-2-aryl-2-cyclohexenone compound, and then synthesizes the 2-aryl-2-cyclohexanedione enol ester compound through acylation. The reaction condition is mild, no additional additives (such as alkali-sodium acetate, expensive silver salt-silver acetate, etc.) need to be added, the C-C bond can be efficiently and quickly constructed, the 2-aryl-2-cyclohexanedione cyclization derivative is obtained, the reaction operation is simple, the reaction time is short, the method has high efficiency and high safety, the substrate range is wide, the functional group tolerance is good, the method conforms to the concept of green chemistry and high atomic economy, and is very suitable for large-scale industrial production.

An asbestos free friction material composition and associated brake pad for vehicles including inorganic and / or organic and / or metallic fibers, at least a binder, at least a friction modifier or lubricant, at least a filler or abrasive and at least a soluble salt of barium and / or calcium and / or aluminum and / or silver with percentage between 0.5-10% by weight. Among them barium carbonate, calcium hydroxide, aluminum triacetate and silver acetate are preferably.

The invention discloses a green light-emitting core-shell quantum dot and a preparation method thereof, and relates to the technical field of quantum dots. Comprising the following steps: dissolving powdered sulfur in oleylamine to obtain a sulfur stock solution; the preparation method comprises the following steps: mixing silver acetate, indium acetate, gallium triacetylacetonate and oleylamine, degassing, heating to 100-120 DEG C, injecting a ligand and a sulfur stock solution, heating to 270-280 DEG C, reacting, purifying the obtained coarse AgInGaS2 core quantum dot, dispersing in oleylamine, adding GaCl3 and the sulfur stock solution at 115-125 DEG C, heating to 220-260 DEG C, reacting to grow an AgGaS2 shell layer, purifying, and drying to obtain the AgInGaS2 core quantum dot. The green light-emitting core-shell quantum dot with high blue light absorption coefficient (up to 6.46 * 10 < 5 > M <-1 >. Cm <-1 >), narrow-spectrum emission (the half-peak width is 32 nm), defect-free light emission, high color purity and high light-emitting efficiency (up to 94%) is obtained.

The invention discloses a windmill-shaped alpha-Fe2O3 / Ag nano hybrid material and a preparation method and application thereof in relieving plant salt stress, and the method comprises the following steps: mixing fusiform alpha-Fe2O3 prepared by a forced hydrolysis method with silver acetate, then carrying out ball milling treatment, and then carrying out a high-temperature calcination process to obtain the windmill-shaped alpha-Fe2O3 / Ag nano hybrid material. And the windmill-shaped alpha-Fe2O3 / Ag hybrid structure formed by assembling the fusiform alpha-Fe2O3 and the Ag nanoparticles is obtained. The nano hybrid material has high specific surface area, excellent dispersity and remarkable leaf surface adhesion performance, when the nano hybrid material is applied to plant cultivation, the material can effectively relieve growth inhibition caused by salt stress, can regulate and control plant hormone signals, terpene and carbohydrate metabolism, sulfur metabolism, protein homeostasis and the like, realizes multi-channel comprehensive regulation, and has a wide application prospect. Therefore, the plant stress resistance and quality are improved.

The application belongs to the technical field of pharmaceutical chemistry and pharmacology, and relates to application of a forskolin tetracyclic analogue in preparation of an anti-inflammatory drug, the forskolin tetracyclic analogue has a chemical structural formula shown in formula (I), 7-deacetyl forskolin 1 is obtained by reaction of forskolin and sodium methoxide in methanol, then the forskolin rearrangement product 2 is obtained by reaction of the 7-deacetyl forskolin 1 and sodium periodate in a DCM-H2O mixed solution, the forskolin rearrangement product 2 and DMP, pyridine are reacted in acetonitrile to obtain the forskolin rearrangement product 3, and finally the forskolin rearrangement product 3 is reacted with aryl iodide in anhydrous dichloroethane under catalysis of anhydrous silver acetate, anhydrous copper acetate and palladium acetate to obtain the forskolin tetracyclic analogue. The forskolin tetracyclic analogue obtained in the application has strong anti-inflammatory activity and can be used for preparation of an anti-inflammatory drug.

The application belongs to the technical field of pharmaceutical chemistry and pharmacology, and relates to application of a forskolin oxygen bridge ring derivative in preparation of anti-inflammatory drugs. The forskolin oxygen bridge ring derivative has a chemical structural formula shown in formula (I), is obtained by reacting forskolin and potassium hydroxide in methanol to obtain forskolin rearrangement product 1, and then reacting the forskolin rearrangement product 1 with aryl iodide in anhydrous dichloroethane under the catalysis of anhydrous silver acetate, anhydrous copper acetate and palladium acetate to obtain the forskolin oxygen bridge ring derivative (I). The forskolin oxygen bridge ring derivative obtained by the application has relatively strong anti-inflammatory activity, and the activity is equivalent to that of dexamethasone, and can be used for preparing anti-inflammatory drugs.