A porous photothermal film with antibacterial properties and its preparation and application

A performance, photothermal technology, applied in the direction of coating, etc., can solve the problems of reduced water vapor output, complicated preparation methods, low porosity, etc., and achieve the effects of reducing heat loss, simple operation, and low cost

Active Publication Date: 2021-06-29
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a porous photothermal film with antibacterial properties and its preparation and application, which overcomes the complexity of the preparation method in the prior art, the high cost or the low porosity leading to the reduction of the output of water vapor, which limits its wide application. The technical defects of the application of the invention, the preparation method of the invention is simple, the operability is strong, and the obtained CNT@PEI / MCE photothermal film has good stability, not only has high photothermal conversion efficiency, but also has good antibacterial properties

Method used

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  • A porous photothermal film with antibacterial properties and its preparation and application
  • A porous photothermal film with antibacterial properties and its preparation and application
  • A porous photothermal film with antibacterial properties and its preparation and application

Examples

Experimental program
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Embodiment 1

[0037] 2 mg of carbon nanotubes (Shanghai Aladdin Biochemical Technology Co., Ltd.) was added to 20 mL of deionized water containing 25 mg of polyethyleneimine (Shanghai Aladdin Biochemical Technology Co., Ltd., M.W. 70,000), and treated with stirring for 30 min and ultrasonication for 2 h. A uniform dispersion was obtained, and then the dispersion was filtered on a mixed cellulose ester filter membrane (Shanghai Luna Biotechnology Co., Ltd.) with a diameter of 47 mm and a pore size of 0.22 μm by vacuum filtration. Dry for about 12 hours.

[0038] figure 2 The SEM (A-C) and XPS (D) spectra of the CNT@PEI / MCE photothermal film provided for the examples of the present invention and its optical photos (E, F), it can be seen from the pictures (A-C) that CNTs are uniformly distributed in the porous on the MCE film with a thickness of about 1.6 μm, typical CNTsp appeared in (D) 2 -Hybridized C peak (284.5 eV) and C-NH of PEI 2 (400.3 eV), (E, F) show that the obtained black photot...

Embodiment 2

[0040] Add 4 mg of carbon nanotubes to 20 mL of deionized water containing 50 mg of polyethyleneimine, stir for 1 h and ultrasonically treat for 2 h to obtain a uniform dispersion, and then use vacuum filtration to filter the dispersion to a mixed fiber with a pore size of 0.22 μm. The resulting photothermal film was dried at room temperature for about 12 hours.

[0041] image 3 The optical spectrum and infrared thermal image of the CNT@PEI / MCE photothermal film provided in the embodiment of the present invention, image 3 A shows that the CNT@PEI / MCE film material has a good absorption of light in the wavelength range of 200nm to 2500nm and image 3 In B, it can be seen that the heat management of the entire photothermal film is concentrated at the interface during the illumination process, and the MCE substrate has a low thermal conductivity (0.565W m -1 K -1 ) reduces the loss of heat and effectively improves the utilization rate of solar energy.

Embodiment 3

[0043] Add 2 mg of carbon nanotubes to 10 mL of deionized water containing 50 mg of polyethyleneimine, stir for 1 h and ultrasonically treat for 2 h to obtain a uniform dispersion, and then use vacuum filtration to filter the dispersion into mixed fibers with a pore size of 0.22 μm. The resulting photothermal film was dried at room temperature for about 12 hours.

[0044] Figure 4 It was shown that the contact angle of the CNT layer rapidly decreased to 0° within 60 s after grafting PEI, suggesting that its Wenzel’s wetting behavior (sufficient contact with the hot spot) might originate from the synergistic effect of the hygroscopicity of PEI and the surface roughness of the film.

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Abstract

The invention relates to a porous photothermal film with antibacterial properties and its preparation and application. Preparation: disperse carbon nanotubes through the non-covalent bond between polyethyleneimine PEI and carbon nanotubes CNT, and prepare uniformly dispersed CNT aqueous solution, the solution is vacuum filtered on the surface of the mixed cellulose ester MCE filter membrane to form a self-floating double-layer porous photothermal film. The top light-to-heat conversion layer CNT@PEI of the film can achieve good mechanical stability through electrostatic interaction with the bottom heat insulation layer MCE, and the PEI on the film surface can endow it with good antibacterial properties. The preparation method of the invention is simple, and the operability is strong, and the cost of the obtained photothermal film material is low, and has high interface water evaporation efficiency and fast evaporation rate.

Description

technical field [0001] The invention belongs to the field of photothermal film material and its preparation and application, in particular to a porous photothermal film with antibacterial properties and its preparation and application. Background technique [0002] Converting solar energy into heat energy and making the heat localized at the air-water interface to drive the interfacial water evaporation technology can maximize the use of solar energy, which has broad application prospects in the fields of distillation and seawater desalination. A typical photothermal interface (film) consists of a top photothermal layer and a bottom support layer. The top photothermal layer should maximize the absorption of solar energy and perform photothermal conversion, and the bottom support layer should minimize heat loss and energy. Quickly rehydrate. On the one hand, the mixed cellulose ester (MCE) porous membrane has self-floating properties and good surface wettability, which can n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C09D179/02C09D7/61C08L1/02
CPCC08J2301/02C08J2479/02C08K2201/011C08K3/041C08J7/0427
Inventor 王义李亚玲
Owner DONGHUA UNIV
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