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High-sensitivity flexible pressure sensing material in pure water and application thereof

A high-sensitivity, sensing material technology, applied in the field of high-sensitivity flexible pressure sensing materials, can solve the problem of lack of clear micro-engineering methods, and achieve the effects of good adjustability, high sensitivity and stability, and high pressure response sensitivity

Active Publication Date: 2022-02-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although structural micro-engineering technology has achieved good results in improving the sensitivity, structural engineering methods have great advantages in the control of the tunability and uniformity of the patterned structure and pore structure, the reproducibility of the sensing structure, and the complexity of photolithography. There are still many challenges in terms of performance and cost control. At the same time, due to the variety of sensing mechanisms of the sensor, for different sensing materials, the properties of the material itself will have different effects on the performance of the microstructure, resulting in the best The micro-engineering method still lacks a clear

Method used

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  • High-sensitivity flexible pressure sensing material in pure water and application thereof
  • High-sensitivity flexible pressure sensing material in pure water and application thereof
  • High-sensitivity flexible pressure sensing material in pure water and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 1 A schematic diagram showing the polymerization of alkenyl monomers containing zwitterions to form a hydrogel; specifically, the following steps are included: (1) adding 3-[[2-(methacryloyloxy)ethyl]dimethylammonium]propane Ester (carboxybetaine) (4.2 g) was dissolved in water (12 mL), sonicated to dissolve completely, then methylenebisacrylamide (cross-linking agent) (0.0125 g) was added, sonicated to dissolve, and finally added Ammonium sulfate (thermal initiator) (0.02g) and tetramethylethylenediamine (accelerator) (0.0155g, 20μL) were stirred thoroughly to obtain a pre-reaction solution. Add the pre-reaction solution between two slides separated by a 2 mm thick PDMS spacer. Polymerization was then carried out at 60°C for 6 hours to ensure sufficient reaction. After the reaction, the hydrogel was peeled off from the glass slide and soaked in pure water, and the pure water was replaced every day for 5 days to remove unreacted chemicals and reagents to obtain...

Embodiment 2

[0030] (1) Dissolve 3-[[2-(methacryloyloxy)ethyl]dimethylammonium]propionate (carboxybetaine) (4.2 g) in water (12 mL), and ultrasonically make it completely Dissolved, followed by addition of methylenebisacrylamide (crosslinker) (0.025 g), sonicated for dissolution, and finally ammonium persulfate (thermal initiator) (0.02 g) and tetramethylethylenediamine (accelerator) (20 μL), and stir well to obtain the pre-reaction solution. Add the pre-reaction solution between two slides separated by a 2 mm thick PDMS spacer. Polymerization was then carried out at 60°C for 6 hours to ensure sufficient reaction. After the reaction, the hydrogel was peeled off from the glass slide and soaked in pure water, and the pure water was replaced every day for 5 days to remove unreacted chemicals and reagents to obtain a highly sensitive flexible pressure sensor with swelling balance. Sensitive material.

[0031] The setting parameters of digital bridge LCR are: test frequency 100 kHz, test lev...

Embodiment 3

[0033] Dissolve 3-[[2-(methacryloyloxy)ethyl]dimethylammonium]propionate (carboxybetaine) (4.2 g) in water (12 mL), sonicate to dissolve completely, and then Add methylenebisacrylamide (crosslinker) (0.05 g), dissolve by ultrasonication, and finally add ammonium persulfate (thermal initiator) (0.02 g) and tetramethylethylenediamine (accelerator) (20 μL), The pre-reaction solution is obtained after fully stirring evenly. Add the pre-reaction solution between two slides separated by a 2 mm thick PDMS spacer. Polymerization was then carried out at 60°C for 6 hours to ensure sufficient reaction. After the reaction, the hydrogel was peeled off from the glass slide and soaked in pure water, and the pure water was replaced every day for 5 days to remove unreacted chemicals and reagents to obtain a highly sensitive flexible pressure sensor with swelling balance. Sensitive material.

[0034] The setting parameters of digital bridge LCR are: test frequency 100 kHz, test level 2 V. D...

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Abstract

The invention belongs to the field of pressure-sensitive materials, and particularly relates to a high-sensitivity flexible pressure sensing material in pure water and application thereof. The sensing material is prepared by the following steps of adding a cross-linking agent into an alkenyl monomer aqueous solution containing zwitter-ions, performing ultrasonic dissolution, finally adding a thermal initiator and an accelerant, and fully and uniformly stirring to obtain a pre-reaction solution, and adding the pre-reaction solution between two glass slides, and then carrying out polymerization to ensure that the reaction is sufficient to obtain the hydrogel. According to the zwitter-ion hydrogel provided by the invention, when the zwitter-ion hydrogel is subjected to external pressure, positive and negative charge groups attract each other, a strong solvation effect can be generated on water molecules, so that the water molecules are ionized to generate free ions, the material has higher pressure response sensitivity, and high-sensitivity sensing is realized in pure water for the first time.

Description

technical field [0001] The invention belongs to the field of pressure-sensitive materials, in particular to a high-sensitivity flexible pressure-sensing material in pure water and its application. Background technique [0002] In order to meet the growing demand for pressure sensors in some specific scenarios of flexible wearable devices (such as health monitoring, artificial intelligence, human-machine interface, etc.), how to improve the sensitivity of sensors has become an important research direction for next-generation sensors. Sensitivity describes the change of the output signal relative to the initial output signal within a specific pressure range, reflecting the responsiveness of the wearable device to mechanical stimuli, and is one of the key performance parameters of the flexible pressure sensor. [0003] The currently developed methods for improving the sensitivity of wearable devices are mainly from the perspective of structural micro-engineering design of mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L33/14C08L43/02C08L33/24C08F220/36C08F220/38C08F230/02C08F220/58C08F220/54C08F220/06C08F222/38C08F230/06G01L1/16
CPCC08J3/075C08F220/365C08F220/387C08F230/02C08F220/58C08F220/54G01L1/16C08J2333/14C08J2343/02C08J2333/24C08F222/385C08F220/06C08F230/065
Inventor 杨静张雷徐思佳
Owner TIANJIN UNIV
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