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Preparation method of porous composite photo-thermal hydrogel based on polyvinyl alcohol and graphite powder

A technology of polyvinyl alcohol and graphite powder, which is applied in lighting and heating equipment, steam generation methods using solar energy, steam generation methods, etc., to achieve the effects of saving production costs, good mechanical properties, and good biocompatibility

Inactive Publication Date: 2019-08-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these can simultaneously satisfy the important characteristics of low cost, scalable fabrication, biocompatibility, environmental friendliness, and good durability required for practical applications.

Method used

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  • Preparation method of porous composite photo-thermal hydrogel based on polyvinyl alcohol and graphite powder
  • Preparation method of porous composite photo-thermal hydrogel based on polyvinyl alcohol and graphite powder
  • Preparation method of porous composite photo-thermal hydrogel based on polyvinyl alcohol and graphite powder

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Experimental program
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Effect test

Embodiment 1

[0031] The preparation method of the porous composite photothermal gel based on polyvinyl alcohol and graphite powder in this embodiment comprises the following steps:

[0032] Disperse 0.03g of graphite powder in 30mL of deionized water with vigorous stirring for 1h; add 3g of polyvinyl alcohol and stir vigorously at 80°C for 1.5h to completely dissolve; dissolve 1g of polyethylene glycol 20000 in 5mL of acetone, then add dropwise Among them, continue to stir to obtain a black viscous mixture; pour the mixture into a mold, put it in a -20°C refrigerator overnight, and perform freezing and cross-linking; take the sample out of the refrigerator and soak it in absolute ethanol for 12h, and then deionize Soak in water for 2 hours to obtain a composite hydrogel.

[0033] Measure the reflectance (i.e. optical properties) of the hydrogel with a UV-visible-near-infrared spectrophotometer, and the test range is 200-2500nm; after the hydrogel is freeze-dried, observe the morphology wit...

Embodiment 2

[0036] Disperse 0.09g of graphite powder in 30mL of deionized water with vigorous stirring for 1h; add 3g of polyvinyl alcohol and stir vigorously at 80°C for 2h to completely dissolve; dissolve 0.5g of polyethylene glycol 20000 in 10mL of acetone, then add dropwise Among them, continue to stir to obtain a black viscous mixture; pour the mixture into a mold, put it in a -20°C refrigerator overnight, and perform freezing and cross-linking; take the sample out of the refrigerator and soak it in absolute ethanol for 12h, and then deionize Soak in water for 2 hours to obtain a composite hydrogel.

[0037] Measure the reflectance (i.e. optical properties) of the hydrogel with a UV-visible-near-infrared spectrophotometer, and the test range is 200-2500nm; after the hydrogel is freeze-dried, observe the morphology with a scanning electron microscope; use a rheometer to measure the water The mechanical properties of the gel (including storage modulus and loss modulus); such as Figur...

Embodiment 3

[0039] Disperse 0.18g of graphite powder in 30mL of deionized water with vigorous stirring for 1h; add 3g of polyvinyl alcohol and stir vigorously at 85°C for 1.5h to achieve complete dissolution; dissolve 1g of polyethylene glycol 20000 in 10mL of acetone, then add dropwise Among them, continue to stir to obtain a black viscous mixture; pour the mixture into a mold, put it in a -20°C refrigerator overnight, and perform freezing and cross-linking; take the sample out of the refrigerator and soak it in absolute ethanol for 24h, and then deionize Soak in water for 2 hours to obtain a composite hydrogel.

[0040] Measure the reflectance (i.e. optical properties) of the hydrogel with a UV-visible-near-infrared spectrophotometer, and the test range is 200-2500nm; after the hydrogel is freeze-dried, observe the morphology with a scanning electron microscope; use a rheometer to measure the water The mechanical properties of the gel (including storage modulus and loss modulus); such a...

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Abstract

The invention discloses a preparation method of a porous composite photo-thermal hydrogel based on polyvinyl alcohol and graphite powder. The method comprises the following steps: dispersing graphitepowder in deionized water by stirring at normal temperature, then adding polyvinyl alcohol and performing stirring and dissolving, then adding an appropriate amount of a pore-forming agent polyethylene glycol, and finally performing crosslinking at a low temperature and performing immersing successively in absolute ethanol and deionized water to obtain the porous composite hydrogel. The porous composite photo-thermal hydrogel prepared by the method can realize local thermal localization under irradiation of sunlight, and thereby water vapor is efficiently generated. The method has the advantages of low raw material price and simple process, large-scale preparation can be realized, and a prepared material has good mechanical properties and can be recycled.

Description

technical field [0001] The invention belongs to the field of preparation of photothermal conversion materials, and relates to a preparation method of porous composite photothermal gel based on polyvinyl alcohol and graphite powder. Background technique [0002] The shortage of water resources and the shortage of energy are two major problems faced by mankind at present, and the solar steam technology solves the problem of water shortage by collecting solar energy. By rationally designing solar photothermal conversion materials to purify water, the current prominent problems of energy shortage and water resource shortage can be solved at the same time, and it can kill two birds with one stone. [0003] Carbon-based materials stand out due to their broadband absorption of sunlight and their own chemical stability, including graphene, carbon nanotubes, etc. However, these carbon-based materials have good thermal conductivity and relatively brittle mechanical properties. Noble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26C08J3/075C08J3/24C08L29/04C08K3/04F24S70/14F22B1/00
CPCC08J3/075C08J3/24C08J9/26C08J2329/04C08K3/04F22B1/006F24S70/14Y02E10/40
Inventor 吴雪娥王凯车黎明何宁王远鹏凌雪萍陈晓东
Owner XIAMEN UNIV
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