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Polydopamine-cellulose nanofibrils photothermal conversion composite film

A nanofibril, polydopamine technology, applied in the directions of alkali metal compounds, inorganic chemistry, other chemical processes, etc., can solve the problem of low photothermal conversion efficiency, achieve enhanced photothermal conversion efficiency, good water phase stability, source wide range of effects

Active Publication Date: 2022-03-15
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of low light-to-heat conversion efficiency of PDA materials in the prior art, the present invention provides a polydopamine-cellulose nanofibril light-to-heat conversion composite film

Method used

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  • Polydopamine-cellulose nanofibrils photothermal conversion composite film
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  • Polydopamine-cellulose nanofibrils photothermal conversion composite film

Examples

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Effect test

Embodiment 1

[0033] (1) Mechanically pulverize 5 g of tobacco rods to 20 meshes, and add them into a formic acid solution with a concentration of 80 wt%. The weight ratio of the added tobacco rod to the formic acid solution is 1:50. After reacting for 7 hours at a temperature of 90°C and a stirring speed of 800rpm, the hydrolysis residue was washed to neutrality; then dimethyl sulfoxide was added to the solid for replacement to obtain a suspension of cellulose nanofibrils; After the homogenization treatment, the content of nanofibers in the cellulose suspension is 0.5wt%, the pressure is 100 MPa, and the homogenization times are 10 times; after the treatment, a uniform dispersion of cellulose nanofibrils is obtained. The cellulose nanofibrils in the dispersion liquid are surface esterified cellulose nanofibrils (the degree of substitution of esterification is 0.25), and its TEM morphology photo is as attached figure 1 shown. At the same time, the hydrolyzate is subjected to solid-liquid ...

Embodiment 2

[0036] (1) Mechanically pulverize 5 g of softwood pulp to 20 mesh, and add it into a formic acid solution with a concentration of 90 wt%. The weight ratio of added wood pulp to formic acid solution is 1:25. After reacting for 6 hours at a temperature of 95°C and a stirring speed of 600rpm, the hydrolysis residue was washed to neutrality; then dimethyl sulfoxide was added to the solid for replacement to obtain a suspension of cellulose nanofibrils; After the homogenization treatment, the content of nanofibers in the cellulose suspension is 0.6 wt%, the pressure is 200 MPa, and the homogenization times are 6 times; after the treatment, a uniform dispersion of cellulose nanofibrils is obtained. The cellulose nanofibrils in the dispersion liquid are surface esterified cellulose nanofibrils, and the degree of substitution of esterification is 0.31; at the same time, the hydrolyzate is subjected to solid-liquid separation, and the separated liquid is recovered by vacuum distillation...

Embodiment 3

[0040] (1) Mechanically pulverize 5 g of hardwood pulp to 20 mesh, and add it into a formic acid solution with a concentration of 98 wt%. The weight ratio of added wood pulp to formic acid solution is 1:15. After reacting at a temperature of 96°C and a stirring speed of 200 rpm for 5 hours, the hydrolysis residue was washed to neutrality; then dimethyl sulfoxide was added to the solid for replacement to obtain a suspension of cellulose nanofibrils; After the homogenization treatment, the content of nanofibers in the cellulose suspension is 1 wt%, the pressure is 200 MPa, and the homogenization times are 8 times; after the treatment, a uniform dispersion of cellulose nanofibrils is obtained. The cellulose nanofibrils in the dispersion are surface-esterified cellulose nanofibrils, and the degree of substitution of esterification is 0.37; at the same time, the hydrolyzate is subjected to solid-liquid separation, and the separated liquid is recovered by vacuum distillation Formic...

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Abstract

Aiming at the problem of low photothermal conversion efficiency of PDA materials in the prior art, the present invention provides polydopamine-cellulose nanofibril photothermal conversion composite film. The composite film is prepared by the following method: (1) The natural cellulose raw material is treated with acid and coupled with mechanical treatment to obtain surface esterified cellulose nanofibrils, and then the cellulose nanofibrils are prepared through the cellulose nanofibril dispersion. A wet film composed of nanofibrils, that is, a CNF-based film. The ester group substitution degree of the cellulose nanofibrils is 0.2-1.5. (2) After drying the CNF base film, soak it in the dopamine aqueous solution to react for 1-48h; take it out, put it into the ammonia water / ethanol / water system or trishydroxymethylaminomethane system for self-polymerization reaction for 20-50h; take it out, After secondary drying, the polydopamine-cellulose nanofibril composite film can be obtained. The composite film described in the application realizes the orderly arrangement of PDA particles, greatly improves the light-to-heat conversion efficiency, and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to polydopamine composite materials, in particular to polydopamine cellulose nanofibril light-to-heat conversion composite films. Background technique [0002] In human society and nature, people have been pursuing efficient collection of solar energy. This not only enables organisms to survive in harsh natural environments, but also promotes the development of modern sustainable science and nanotechnology in the field of regeneration and cleaning. At present, efficient solar energy conversion technology has been widely used in seawater desalination, power generation and other fields. In recent years, researchers have devoted themselves to the study of inorganic nanomaterials with controllable morphology, such as graphene and carbon nanotubes. These materials can be used as working fluids (nanofluids) or coatings (composite films, aerogels) to absorb sunlight; current literature r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/16C08J7/14C08J7/12C08J5/18B01J20/24B01J20/28B01J20/30C02F1/28C08L1/02
CPCC08J7/16C08J7/14C08J7/123C08J5/18B01J20/24B01J20/28033C02F1/286C08J2301/02
Inventor 李滨刘莹莹刘超崔球
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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