Capacitive sensor material, and preparation method and application thereof

A capacitive sensor, wood technology, applied in the direction of instruments, measuring devices, measuring force, etc., can solve the problems of low mechanical strength, narrow stress range, and environmental protection requirements of hydrogel, and achieve excellent ion conductivity, The effect of excellent mechanical properties

Active Publication Date: 2020-02-04
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to different sources of materials, hydrogels are mainly divided into two categories: one is synthetic hydrogels based on petroleum sources, such as polyacrylic acid and its ester series hydrogels, polyvinyl alcohol series hydrogels, etc. The second is the non-synthetic hydrogel with natural polymer as the main body or starting material, such as the starch-based hydrogel belonging to polysaccharides. , cellulose-based hydrogel, etc. The manufacture of this type of hydrogel is basically environmentally friendly and degradable in terms of starting materials, and the source of raw materials is also relatively wide. However, hydrogels often have low mechanical strength and the range of stress sensing is also limited Very narrow

Method used

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  • Capacitive sensor material, and preparation method and application thereof
  • Capacitive sensor material, and preparation method and application thereof
  • Capacitive sensor material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1: the preparation of wood airgel

[0044] S1: Take poplar logs, use a circular saw to cut the sapwood into 10mm×10mm×10mm blocks, and then add them to 325mL deionized water containing 2.5mL glacial acetic acid and 3g NaClO 2 solution, and then heated at 75°C for 1 hour, and then repeated the above operation 5 times, washed with water to obtain acid-treated wood; S2: soak the acid-treated wood obtained in S1 into 2.5mol L -1 NaOH and 0.4mol L -1 Na 2 SO 3 solution, heated at 100°C for 5h, and then at 100°C, 2.5mol·L -1 h 2 o 2 Heating in an aqueous solution for 8 hours to obtain alkali-treated wood; S3: immerse the alkali-treated wood obtained in S2 into deionized water to fully wash it, then immerse it in tert-butanol to fully replace the deionized water in the wood block, and then freeze-dry it (temperature: - 50°C, vacuum degree ≤ 20Pa) to obtain wood airgel, the density of which is 0.11g·cm -3 , see attached figure 1 .

Embodiment 2

[0045] Embodiment 2: the preparation of wood airgel

[0046] In Example 1, "get poplar log" into "get balsa log", and other preparation conditions are the same as in Example 1, and the wood airgel density obtained is 0.05g cm -3 .

Embodiment 3

[0047] Embodiment 3: the preparation of wood airgel

[0048] In Example 1, "Use a circular saw to cut the sapwood into 10mm x 10mm x 10mm blocks" to "Use a circular saw to cut the sapwood into 20mm x 20mm x 10mm blocks". Other preparation conditions are the same as embodiment 1, and the wood airgel density that obtains is 0.21g cm -3 .

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Abstract

The invention provides a preparation method of a capacitive sensor material. The preparation method comprises the following steps: processing wood with an acidic and alkaline solution, fully washing the wood with water, soaking the wood in tert-butyl alcohol to replace deionized water in the wood, freeze-drying the wood soaked in the tert-butyl alcohol to obtain wood aerogel, and polymerizing thewood aerogel with an aqueous solution containing a polyelectrolyte monomer, a cross-linking agent, an initiator and a catalyst to obtain the capacitive sensor material. The invention further disclosesa capacitive sensor containing the sensor material, and a preparation method thereof. The sensor material prepared by the method has excellent mechanical properties and an excellent ionic conductivity, and the further prepared flexible capacitive mechanical sensor has a very high sensitivity and a very wide sensing range.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a capacitive sensor material and its preparation method and application. Background technique [0002] As a soft material, hydrogel is composed of an ordered three-dimensional structure, has good hydrophilicity and biocompatibility, and can effectively reduce rejection when used as a biological implant. Moreover, hydrogel is a kind of flexible material, which has very similar properties to many living tissues such as articular cartilage and muscle tissue, that is, it not only has good mechanical strength and compression resilience, but also has high external stress effect. Sensitivity and monitoring functions. Therefore, hydrogel is the most ideal substitute material for soft tissues such as artificial muscles, artificial joints, and artificial skin. In recent years, the use of hydrogel to develop materials such as flexible skin, wearable devices, and pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C08J9/28C08H8/00G01L1/14C08L97/02
CPCC08H8/00C08J9/28C08J9/36C08J2201/0482C08J2397/02G01L1/142
Inventor 沈晓萍孙庆丰聂康晨王昭松
Owner ZHEJIANG FORESTRY UNIVERSITY
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