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Temperature-sensitive gel, temperature-sensitive sensor, preparation method of gel, and preparation method of sensor

A temperature-sensitive sensor and temperature-sensitive gel technology, which is applied in the direction of instruments, thermometers, scientific instruments, etc., can solve the problems of unfavorable large-scale production, poor biocompatibility, and poor sensitivity, so as to shorten the preparation cycle and make the preparation process fast and convenient. Effect

Active Publication Date: 2020-05-12
INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above operation process is relatively complicated, and the preparation cost is high, which is not conducive to large-scale production. Although the prepared flexible temperature sensor can be naturally attached to the skin surface, its sensitivity is poor and its biocompatibility is not good.

Method used

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  • Temperature-sensitive gel, temperature-sensitive sensor, preparation method of gel, and preparation method of sensor
  • Temperature-sensitive gel, temperature-sensitive sensor, preparation method of gel, and preparation method of sensor
  • Temperature-sensitive gel, temperature-sensitive sensor, preparation method of gel, and preparation method of sensor

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preparation example Construction

[0028] Specifically, the preparation method includes the following steps:

[0029] S1: Dispersing the liquid metal, the first monomer, the crosslinking agent, and the initiator in the medium to prepare a mixed solution; and

[0030] S2: Forming the mixed solution on a carrier to form a preform, and performing a first curing treatment on the preform to obtain the temperature-sensitive gel.

[0031] Wherein, the temperature-sensitive gel includes a first polymer, the first polymer is a temperature-sensitive polymer material obtained by polymerization of the first monomer, and the critical phase transition temperature of the first polymer is T 1 , and the first polymer has a three-dimensional network structure, the liquid metal and the medium are dispersed in the three-dimensional network structure; the temperature-sensitive gel can respond to changes in external temperature, and when the external temperature reaches a preset temperature T 2 , the liquid metal dispersed in the ...

Embodiment 1

[0079] (1) Add 15 parts by weight of gallium-indium alloy to 25 parts by weight of deionized water and ultrasonically disperse for 8 minutes under an ultrasonic power of 60W to prepare solution A;

[0080] 20 parts by weight of N-isopropylacrylamide, 1.5 parts by weight of polyvinyl alcohol (molecular weight of 7000), 1 part by weight of N,N'-methylenebisacrylamide, 0.08 parts of tetramethylethylenedi The amine is dispersed in 30 parts by weight of deionized water to prepare solution B;

[0081] The ammonium persulfate (thermal initiator) of 0.6 weight part is dispersed in the deionized water of 6.82 weight part, makes solution C;

[0082] The prepared solution A, solution B and solution C were uniformly mixed and placed in a mold, and heated at a temperature of 50° C. for 10 minutes to obtain a temperature-sensitive gel.

[0083] (2) Paste the prepared thermosensitive gel on the polydimethylsiloxane substrate;

[0084] The conductive paste containing silver nanoparticles is...

Embodiment 2

[0088] (1) Add 8 parts by weight of gallium-tin-indium alloy into 30 parts by weight of deionized water and ultrasonically disperse for 2 minutes under an ultrasonic power of 100W to prepare solution A;

[0089] Disperse 18 parts by weight of N-isopropylacrylamide, 0.9 parts by weight of polyethylene glycol (molecular weight is 10000), 2 parts by weight of polyethylene glycol diacrylate, and 0.09 parts of tetramethylethylenediamine in In 47 parts by weight of deionized water, solution B was prepared;

[0090] Disperse 0.8 parts by weight of 1,3-acetone dicarboxylic acid (photoinitiator) in 3.21 parts by weight of deionized water to prepare solution C;

[0091] The prepared solution A, solution B and solution C were uniformly mixed and placed in a mold, and irradiated for 5s under the light of 400nm band, and the light intensity was 50mW / cm 2 , to prepare a thermosensitive gel.

[0092] (2) Paste the prepared thermosensitive gel on the thermoplastic polyurethane substrate;

...

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Abstract

The invention provides a preparation method of a temperature-sensitive gel. The preparation method comprises the following steps: dispersing liquid metal, N-isopropylacrylamide and derivatives thereof, a cross-linking agent and an initiator in a medium to obtain a mixed solution; and enabling the mixed solution to form a prefabricated body on a carrier, and carrying out first curing treatment. Thetemperature-sensitive gel can respond to the change of the external temperature, and when the external temperature reaches a preset temperature T2, the liquid metal dispersed in the first polymer isswitched between a continuous phase and a dispersed phase. The prepared temperature-sensitive gel has a negative temperature effect and can realize electric conduction when the external temperature reaches the preset temperature T2; and the liquid metal has good conductivity and heat transfer performance, so that the temperature-sensitive gel has high sensitivity. The invention also provides the temperature-sensitive gel prepared by the preparation method, a temperature-sensitive sensor and a preparation method of the sensor.

Description

technical field [0001] The invention relates to the technical field of flexible electronics, in particular to a temperature-sensitive gel, a temperature-sensitive sensor and a preparation method thereof. Background technique [0002] Flexible temperature sensors are used in the fields of electronic skin, robot sensors, environmental safety and human health temperature measurement. They are usually required to have the characteristics of simple operation, light weight, biocompatibility, high sensitivity and high flexibility. [0003] Traditional flexible temperature sensor preparation methods usually use magnetron sputtering, microelectromechanical systems (MEMS), physical vapor deposition (PVD) and other technologies to deposit metal thin films on flexible substrates to produce flexible resistive temperature sensors. However, the above operation process is relatively complicated, and the preparation cost is high, which is not conducive to large-scale production. Although the...

Claims

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Application Information

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IPC IPC(8): C08L33/24C08L29/04C08L33/02C08L5/12C08L5/08C08L71/02C08F220/54C08F222/38C08F222/20C08K3/08G01K7/22
CPCC08L33/24C08F220/54C08K3/08G01K7/226C08F222/385C08L29/04C08L33/02C08L5/12C08L5/08C08L71/02
Inventor 冯雪刘兰兰张柏诚王志建陈颖
Owner INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG
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