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Manganous oxide doped isomelanin nano material with electromagnetic shielding function, preparation method of thin film and product

A manganese oxide, nanomaterial technology, applied in the field of melanin application, can solve the problems of difficult to achieve polymerization, difficult to achieve effective standardized production, slow process, etc., to achieve simple process synergy, good industrialization prospects, and simple thickness and size. Effect

Pending Publication Date: 2022-08-09
SICHUAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] Researchers try to isolate isomelanin from natural products to realize its functional design and expansion, but isomelanin often exists in polysaccharide or protein complexes in nature, which is difficult to effectively separate
However, there is no mature chemical method to synthesize artificial isomelanin materials. This is because on the one hand, the content of isomelanin in nature is lower than that of eumelanin and pheomelanin, and it is difficult to extract; The oxidation potentials of different aggregates of dihydroxynaphthalene have a large gap, and it is difficult to achieve controllable polymerization
At present, the synthesis method for isomelanin mainly starts from its biological pathway and simulates its polymerization process through the pathway of biological enzymes, but this method is slow in process, low in yield and poor in controllability, and it is difficult to achieve effective standardized production

Method used

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  • Manganous oxide doped isomelanin nano material with electromagnetic shielding function, preparation method of thin film and product
  • Manganous oxide doped isomelanin nano material with electromagnetic shielding function, preparation method of thin film and product
  • Manganous oxide doped isomelanin nano material with electromagnetic shielding function, preparation method of thin film and product

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preparation example Construction

[0045] The invention provides a preparation method of a manganese oxide-doped isomelanin nanomaterial, comprising the following steps:

[0046] S1 prepare 1,8-dihydroxynaphthalene solution

[0047] Specifically, prepare a 1,8-dihydroxynaphthalene solution, wherein the solvent is a mixed solvent of acetonitrile and water, carry out ultrasonic dispersion treatment for 3-10 minutes, preferably 5 minutes, and then fully stir it at room temperature for 3-10 minutes, It is preferably 5 minutes to obtain a uniform, transparent and colorless 1,8-dihydroxynaphthalene solution;

[0048] Wherein, the volume fraction of acetonitrile in the mixed solvent is 10-20%, preferably 10%, and the volume fraction of water is 80-90%, preferably 90%;

[0049] Wherein, the content of 1,8-dihydroxynaphthalene in the 1,8-dihydroxynaphthalene solution is 1-3 mg / mL, preferably 2 mg / mL;

[0050] S2 slowly adds potassium permanganate aqueous solution to the 1,8-dihydroxynaphthalene solution of S1, and sti...

Embodiment 1

[0068] A preparation method of a manganese oxide-doped isomelanin nanomaterial, comprising the following steps:

[0069] S1 firstly prepare a 1,8-dihydroxynaphthalene solution, wherein the solvent is a mixed solvent of acetonitrile and water, carry out ultrasonic dispersion treatment for 8 minutes, and then fully stir it at room temperature for 5 minutes to obtain a uniform and transparent colorless solution;

[0070] Specifically, the volume fraction of acetonitrile in the solvent is 10%, and the volume fraction of water is 90%;

[0071] The content of 1,8-dihydroxynaphthalene in the solution is 2 mg / mL;

[0072] The potassium permanganate aqueous solution slowly added by S2 to the 1,8-dihydroxynaphthalene solution of S1 maintained a uniform stirring speed at room temperature, and a uniform and stable black turbid solution was obtained after 20h of continuous stirring;

[0073] Wherein, the concentration of potassium permanganate in the potassium permanganate aqueous solutio...

Embodiment 2

[0082] The steps of the preparation method of the manganese oxide-doped isomelanin nano-film are as follows.

[0083] The manganese oxide-doped isomelanin nanomaterial prepared in the previous example 1 was mixed with a polytetrafluoroethylene dispersion in a certain mass ratio, and then 1 mass part of water was added, and ultrasonic treatment was carried out for 10 minutes to mix and disperse, and then sent into Dry in an oven at about 80°C for 20 minutes to obtain a black gelatinous substance, and roll to obtain a manganese oxide-doped isomelanin nanofilm with a customizable thickness. In this embodiment, the thickness is 3 mm.

[0084] Among them, the mass ratio of polytetrafluoroethylene and manganese oxide-doped isomelanin nanomaterials is 1:8.

[0085] Examples 2-1 to 2-3 are similar to Example 2, with thicknesses of 1 mm, 2 mm and 4 mm, respectively;

[0086] Examples 2-4 to 2-6 are similar to Example 2, except that the manganese oxide-doped isomelanin nanomaterials pr...

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Abstract

The invention provides a manganous oxide doped isomelanin nanometer material with an electromagnetic shielding function, a preparation method of a film and a product, and the preparation method of the nanometer material comprises the following steps: preparing a 1, 8-dihydroxy naphthalene solution with a solvent being a mixed solvent of acetonitrile and water; the method comprises the following steps: slowly adding a potassium permanganate aqueous solution into a 1, 8-dihydroxynaphthalene solution, stirring to obtain a black turbid solution, centrifuging, and washing to obtain an isomelanin nano material; and carrying out heat treatment on the isomelanin nano-material in a protective atmosphere to obtain the manganous oxide doped isomelanin nano-material. The preparation method of the nano-film comprises the following steps: mixing the isomelanin nano-material with a polytetrafluoroethylene dispersion liquid, adding water, carrying out ultrasonic dispersion, drying, and rolling to obtain the manganous oxide doped isomelanin nano-film. According to the invention, multivalent metal ions are adopted as an oxidizing agent, metal is introduced into a melanin material, and a metal loading system with uniform valence is obtained through heat treatment. The thin film has a good electromagnetic shielding function, and thin film materials with different grade requirements can be achieved simply and conveniently by adjusting the thickness.

Description

technical field [0001] The invention provides a preparation method and a product of a manganese oxide-doped isomelanin nanometer material and a manganese oxide-doped nanometer film, which belong to the technical field of melanin application. Background technique [0002] Melanin is widely found in plants, animals and even bacteria and fungi in nature, mainly including eumelanin, pheomelanin, neuromelanin, isomelanin and isomelanin. It undertakes important physiological functions, including UV protection, free radical scavenging and signal transmission. Melanin has important applications in regulating the function of organisms and protecting organisms from external unfavorable factors. However, there are many difficulties in obtaining melanin from nature and further research and application, such as low extraction content, differences in extraction specifications and so on. [0003] Starting from the precursor small molecules of biomass, through rational design of macromole...

Claims

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Application Information

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IPC IPC(8): C08G65/44C08K3/22C01G45/02C08J5/18C08L71/10C08L27/18H05K9/00
CPCC08G65/44C08K3/22C01G45/02C08J5/18H05K9/0081C08K2003/2262C08K2201/011C08J2371/10C08J2427/18Y02E60/13
Inventor 陈鹏章嘉豪徐启明顾志鹏
Owner SICHUAN UNIV
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