A kind of highly sensitive chitosan-based sensing material and its preparation method and application

A technology of sensitive chitosan-based and sensing materials, applied in the field of chitosan-based sensing materials and their preparation, can solve the problems of inability to achieve high-sensitivity linear sensitivity, difficulty in structural design and control, poor mechanical properties, etc., and achieve Excellent cycle stability, high compressibility, and low cost

Active Publication Date: 2021-09-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difficulty of structural design and control, this type of material has poor mechanical properties and is difficult for industrial applications
Therefore, it is still very challenging to construct biomass-based compressible carbon aerogels with superelasticity and excellent fatigue resistance.
At the same time, the current elastic carbon materials are still unable to achieve high sensitivity and wide range of linear sensitivity.

Method used

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  • A kind of highly sensitive chitosan-based sensing material and its preparation method and application
  • A kind of highly sensitive chitosan-based sensing material and its preparation method and application
  • A kind of highly sensitive chitosan-based sensing material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) adding cellulose nanocrystallites into water, and mechanically stirring to obtain a cellulose nanocrystallite suspension with a dispersion concentration of 0.5%;

[0041] (2) FeCl 3 ·6H 2 O is dissolved in the above-mentioned cellulose nanocrystal suspension, the concentration is 0.004mol / L, to obtain FeCl 3 / Cellulose nanocrystal suspension;

[0042] (3) under high-speed stirring (rotational speed is 800rpm), to the above-obtained FeCl 3 Slowly add 0.5% chitosan to the cellulose nanocrystal suspension, stir at high speed until dissolved, and obtain FeCl 3 / chitosan / cellulose nanocrystal suspension;

[0043] (4) the above FeCl 3 The chitosan / cellulose nanocrystal suspension is placed in a plastic box, the box is fastened to the outer wall of the metal box, and liquid nitrogen is poured into the metal box for freezing (freezing), and the solution is frozen after it is completely frozen. Drying (-58°C, vacuum 0.22mbar, time 16 hours) to obtain FeCl 3 / Chito...

Embodiment 2

[0049] (1) adding cellulose nanocrystallites into ultrapure water, and mechanically stirring to obtain a cellulose nanocrystallite suspension with a dispersion concentration of 0.5%;

[0050] (2) FeCl 3 ·6H 2 O is dissolved in the above-mentioned cellulose nanocrystal suspension, and the concentration is 0.008mol / L to obtain FeCl 3 / Cellulose nanocrystal suspension;

[0051] (3) under high-speed stirring (rotational speed is 800rpm) to the above-obtained FeCl 3 Slowly add 0.5% chitosan to the cellulose nanocrystal suspension, stir at high speed until dissolved, and obtain FeCl 3 / chitosan / cellulose nanocrystal suspension;

[0052] (4) the above FeCl 3 The chitosan / cellulose nanocrystal suspension is placed in a plastic box, the box is fastened to the outer wall of the metal box, and liquid nitrogen is poured into the metal box for freezing (freezing), and the solution is frozen after it is completely frozen. Drying (-58°C, vacuum 0.22mbar, time 16 hours) to obtain Fe...

Embodiment 3

[0056] (1) adding cellulose nanocrystallites to ultrapure water, and mechanically stirring to obtain a cellulose nanocrystallite suspension with a dispersion concentration of 0.4%;

[0057] (2) FeCl 3 ·6H 2 O is dissolved in the above-mentioned cellulose nanocrystal suspension, the concentration is 0.004mol / L, to obtain FeCl 3 / Cellulose nanocrystal suspension;

[0058] (3) under high-speed stirring (rotational speed is 800rpm) to the above-obtained FeCl 3 Slowly add 0.6% chitosan to the cellulose nanocrystal suspension, stir at high speed until dissolved, and obtain FeCl 3 / chitosan / cellulose nanocrystal suspension;

[0059] (4) the above FeCl 3 The chitosan / cellulose nanocrystal suspension is placed in a plastic box, the box is fastened to the outer wall of the metal box, and liquid nitrogen is poured into the metal box for freezing (freezing), and the solution is frozen after it is completely frozen. Drying (-58°C, vacuum 0.22mbar, time 16 hours) to obtain FeCl 3...

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Abstract

The invention belongs to the technical field of sensing materials, and discloses a high-sensitivity chitosan-based sensing material and its preparation method and application. Method: Dissolve ferric chloride or ferric chloride hexahydrate in cellulose nanocrystal suspension, then add chitosan to dissolve, and obtain FeCl 3 / chitosan / cellulose nano crystallite suspension; liquid nitrogen freezing, and then freeze-drying, the obtained airgel is carbonized in an inert atmosphere to obtain a sensing material. The present invention combines the advantages of chitosan and cellulose nanocrystals, utilizes the support and carbon connection of cellulose nanocrystals, and prepares high compression, high resilience, excellent recycling performance, high Sensing materials with characteristics such as sensitivity and wide sensing detection range. The sensing material can realize sensitive detection of tiny pressure and strain, and can be applied to various pressure sensing electronic devices.

Description

technical field [0001] The invention belongs to the technical field of sensing materials, and in particular relates to a chitosan-based sensing material with high sensitivity and wide sensing detection range, and a preparation method and application thereof. Background technique [0002] The sensing material may be an elastic carbon material. The important role of elastic carbon materials in wearable sensing devices depends on their compressive properties, sensitivity and fatigue resistance. Traditional compressible carbon materials are mostly constructed from nano-carbon materials such as carbon nanotubes, graphene and its derivatives, and nano-carbon composite materials. [0003] Carbon nanotubes are good raw materials for building elastic aerogels due to their high aspect ratio, flexibility, mechanical robustness, and good electrical conductivity. The main preparation method is chemical vapor deposition. For example, Han Wang et al. (Wang H, Lu W, Di J, et al. Ultra‐Lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05G01L1/00
CPCC01B32/05G01L1/00
Inventor 钟林新胡艺洁彭新文巫雅萧文睿罗青松易基旺
Owner SOUTH CHINA UNIV OF TECH
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