38 results about "Cobaltocene" patented technology

The invention provides a cross-linked anion exchange membrane as well as a preparation method and application thereof, and belongs to the technical field of fuel cells. According to the cross-linked anion exchange membrane provided by the invention, polyvinyl alcohol is used as a membrane matrix, and cobaltocene cations are introduced and are cross-linked with glutaraldehyde, so that the alkali-resistant stability of the exchange membrane is improved, and the ionic conductivity is further kept at a relatively high level. The preparation method is convenient and efficient, and has a good application prospect in alkaline anion exchange membrane fuel cells. The result of an embodiment shows that the cross-linked anion exchange membrane provided by the invention is good in mechanical property, the highest tensile strength can reach 24.5 MPa, and the highest elongation at break is 15%; the conductivity at 80 DEG C can reach 72 mS / cm, and the water absorption swelling ratio does not exceed 20%; and the conductivity can still be kept at 85% or above of the initial value after the material is soaked in a 1M NaOH aqueous solution at 80 DEG C for 1000 hours.

The invention discloses a method for synthesizing betahistine, which comprises the following steps: taking 3-methylaminopropionitrile, a solvent, a monovalent cobaltocene catalyst, and acetylene in an anhydrous and oxygen-free environment at 85-95° C. The betahistine is synthesized through a cyclization reaction under a certain reaction pressure. The method for synthesizing betahistine provided by the invention has simple steps, adopts 3-methylaminopropionitrile and acetylene to synthesize in one step, has low reaction temperature, good safety performance, high utilization rate of raw materials, and can reduce the need for products in multi-step reactions. loss, the product yield is high. Second, the reaction is an anhydrous reaction, which can avoid the generation of a large amount of waste water and alkali-containing hazardous waste generated from 2-vinylpyridine as a raw material.

The invention belongs to the technical field of microwave absorbing materials, and relates to a carbon-nano-tube composite microwave absorbing material and a preparation method thereof. According to the material, a catalyst is dissolved in a liquid carbon source containing an additive to prepare a precursor solution, then, a pressureless sintering method is adopted to prepare the composite microwave absorbing material of which matrixes are carbon nano tubes, iron particles and cobalt-nickel alloy particles are added in the inner walls of the carbon nano tubes, and rare-earth compounds are attached to the outer walls of the carbon nano tubes; the liquid carbon source is a 1,2-dichloroethane solution, the additive is lanthanum nitrate, and ethyl alcohol which promotes the dissolution of lanthanum nitrate is further added in the liquid carbon source; the volume ratio of the 1,2-dichloroethane solution to ethyl alcohol is 9:1, and the catalyst contains 33.93 wt.% of ferrocene, 33.19 wt.% of cobaltocene and 32.88 wt.% of nickelocene. The carbon-nano-tube composite microwave absorbing material has the advantages of being light in weight, wide in absorption frequency band, extremely improved in microwave absorbing performance, high in environmental corrosion resistance and wide in application range; carbon-nano-tube filler prepared by the preparation method is high in purity and few in impurity.

The invention provides a cross-linked anion exchange membrane and its preparation method and application, belonging to the technical field of fuel cells. The crosslinked anion exchange membrane provided by the invention uses polyvinyl alcohol as the membrane matrix, introduces cobaltocene cations, and crosslinks with glutaraldehyde, which not only improves the alkali resistance stability of the exchange membrane, but also maintains the ion conductivity At a higher level; the preparation method is convenient and efficient, and has good application prospects in alkaline anion exchange membrane fuel cells. The results of the examples show that the cross-linked anion exchange membrane provided by the present invention has good mechanical properties, the highest tensile strength can reach 24.5MPa, and the highest elongation at break is 15%; the electrical conductivity can reach 72mS / cm at 80°C, and the water absorption The swelling ratio does not exceed 20%; the electrical conductivity can still remain above 85% of the initial value after soaking in 1M NaOH aqueous solution at 80°C for 1000 hours.

The invention provides a pharmaceutical composition which comprises a pharmaceutical carrier and at least one compound selected from the group consisting of cobaltocene-octamethyl, stigmastan-3,5-diene, galoxolide, benzyl salicylate, eucalyptol, and α-pinene. Also provided is a method of preparing a composition having antimicrobial activity comprising extracting a plant material in an organic solvent, contacting the extracted material to a chromatographic column, and eluting from the chromatographic column with a mobile polar phase to obtain a composition. The plant material is from Mammea Americana, Marchntia polymorpha, or Callistemon citrinus. Also provided is a method of inhibiting the growth of a mycobacterium, comprising administering a composition comprising a carrier and at least one compound selected from among cobaltocene-octamethyl, stigmastan, 3,5-diene, friedelin, galoxolide, benzyl salicylate, eucalyptol, and α-pinene.