A kind of method that carvacrol microemulsion system prepares nano-silver

A carvacrol and nano-silver technology, applied in the nano field, can solve problems such as environmental pollution and toxic compounds, and achieve the effects of good dispersibility and green preparation method

Active Publication Date: 2021-03-09
渭南职业技术学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, most of the compounds used in these synthetic systems are toxic, and their synthesis process will bring certain environmental pollution

Method used

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  • A kind of method that carvacrol microemulsion system prepares nano-silver
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  • A kind of method that carvacrol microemulsion system prepares nano-silver

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preparation example Construction

[0027] A kind of preparation method of nano-silver of the present invention, comprises the following steps:

[0028] (1) Add carvacrol to deionized water, then add surfactant Tween 80, stir under normal temperature, make it mix evenly, the mass concentration of carvacrol is 0.5%, the addition amount of Tween is carvacrol quality 20% of.

[0029] (2) Adopting a high-pressure homogenizer to homogenize the mixed solution obtained in step (1), the homogenization pressure is 500MPa, and the homogenization times are 2 to 4 times to obtain carvacrol microemulsion;

[0030] (3) Take a certain amount of solid silver nitrate, gradually add dilute ammonia water dropwise in silver nitrate, shake while adding dropwise, until the precipitate that generates is all dissolved, obtain silver ammonia solution;

[0031] (4) A certain amount of silver-ammonia solution was added dropwise into 100 mL of carvacrol microemulsion, sealed, and stirred on a magnetic stirrer until the color was dark brow...

Embodiment 1

[0035] 1) Carvacrol is added to deionized water, then surfactant Tween 80 is added, stirred at room temperature to make it evenly mixed, the mass concentration of carvacrol is 0.5%, and the amount of Tween added is 1 / 2 of the carvacrol quality. 20%.

[0036] 2) using a high-pressure homogenizer to homogenize the mixed solution obtained in step (1), the homogenization pressure is 500MPa, and the homogenization times are 4 times to obtain the oil-in-water type carvacrol microemulsion;

[0037] 3) Take a certain amount of solid silver nitrate, gradually add dilute ammonia water dropwise in silver nitrate, shake while dropping, until the precipitates generated are all dissolved, and obtain silver ammonia solution;

[0038] 4) A certain amount of silver ammonia solution was added dropwise into 100mL carvacrol microemulsion, sealed, and stirred on a magnetic stirrer until the color was dark brown and no longer deepened, and a suspension containing silver particles was obtained. The...

Embodiment 2

[0045] 1) Carvacrol is added to deionized water, then surfactant Tween 80 is added, stirred at room temperature to make it evenly mixed, the mass concentration of carvacrol is 0.5%, and the amount of Tween added is 1 / 2 of the carvacrol quality. 20%.

[0046] 2) using a high-pressure homogenizer to homogenize the mixed solution obtained in step (1), the homogenization pressure is 500MPa, and the homogenization times are 3 times to obtain the oil-in-water type carvacrol microemulsion;

[0047] 3) Take a certain amount of solid silver nitrate, gradually add dilute ammonia water dropwise in silver nitrate, shake while dropping, until the precipitates generated are all dissolved, and obtain silver ammonia solution;

[0048] 4) A certain amount of silver ammonia solution was added dropwise into 100mL carvacrol microemulsion, sealed, and stirred on a magnetic stirrer until the color was dark brown and no longer deepened, and a suspension containing silver particles was obtained. The...

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Abstract

The invention discloses a method for preparing nano-silver from a carvacrol microemulsion system. The carvacrol microemulsion is prepared by using a high-pressure homogeneous technology, and the silver ammonia solution is added to the microemulsion system. React for a period of time until the color of the solution turns dark brown and no longer deepens, and a suspension containing nano-silver is obtained. After the suspension is centrifuged in a centrifuge, after being washed with deionized water and ethanol, it is heated at 80°C to 100°C. °C to obtain nano-silver powder. The preparation method provided by the invention is green and environmentally friendly. During the reaction process, silver ions are adsorbed at the oil-water interface by the active groups of carvacrol in the microemulsion, and then reduced to nano-silver. Under the combined effect of group complexation, the nano-silver is stabilized on the surface of the microemulsion, and the surface of the nano-silver is complexed by macromolecular substances, thereby obtaining spherical nano-silver particles with a particle size of 10-50nm with good dispersion and stable existence.

Description

technical field [0001] The invention belongs to the field of nanotechnology, and relates to a method for preparing nano-silver with a carvacrol microemulsion system. Background technique [0002] Silver nanoparticles have the surface effect, small size effect, quantum size effect and macroscopic quantum tunneling effect of nanomaterials, so they have a wide range of applications in medicine, food and other fields. Nano-silver synthesis methods include liquid-phase chemical reduction, photochemical reduction, and electrochemical methods. Patent application number 201710359697.5 uses polyvinyl alcohol pyrrolidone or polyethylene glycol as a protective agent, and N,N-dimethylethanolamine, triethanolamine or methyldiethanolamine as a reducing agent to prepare nano-silver sol; patent application number CN201510236822.4 Using polyvinyl alcohol aqueous solution as a protective agent and sodium borohydride as a reducing agent to prepare nano-silver sol, and using the sol to prepare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/065B22F1/054
Inventor 高红芳
Owner 渭南职业技术学院
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