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Conductive porous pressure-sensitive metamaterial with negative Poisson's ratio characteristic and preparation method and application thereof

A technology of negative Poisson's ratio and metamaterials, applied in the measurement and application of the property force of piezoelectric resistance materials, fluid pressure measurement by changing ohmic resistance, etc., to achieve the effect of excellent compressive elasticity

Active Publication Date: 2021-06-11
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, achieving high sensitivity (>100kPa) at low pressure (-1 ) remains a huge challenge

Method used

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  • Conductive porous pressure-sensitive metamaterial with negative Poisson's ratio characteristic and preparation method and application thereof
  • Conductive porous pressure-sensitive metamaterial with negative Poisson's ratio characteristic and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 30 mg of MXene with a sheet size of about 1-2 μm prepared by chemical method (MILD method) and place it in a reagent bottle, add 3 ml of deionized water, and ultrasonically (power 700W) for 2 minutes to obtain 10 mg / mL of MXene dispersion liquid.

[0029] (2) Add 6 mg of trimethoxysilane coupling agent (KH560) to the MXene solution and shake for 3 minutes.

[0030] (3) Pour the mixed solution of MXene and trimethoxysilane coupling agent obtained in step (2) into a hydrothermal reaction kettle. Put it into an oven to carry out hydrothermal reaction for one hour under the condition of 80°C.

[0031] (4) Put the solution obtained in step (3) into a square reaction tube after waiting for cooling. Pour half of the volume of liquid nitrogen into the Dewar, and place the reaction tube above the liquid nitrogen, inside the Dewar. Wait for the solution to completely freeze.

[0032] (5) Place the solid obtained in step (4) in a freeze dryer, and wait for 5-7 days f...

Embodiment 2

[0035] This example adopts conductive nanomaterials and organic crosslinking agents different from those in Example 1, and through directional freeze-drying technology, a porous block material with a symmetrical concave honeycomb microporous structure is formed; the final conductive porous pressure-sensitive super material product.

[0036](1) Weigh 40 mg of graphene oxide with a sheet size of about 1-2 μm prepared by a chemical method (improved Hummers method) and place it in a reagent bottle, add 2 ml of deionized water, and ultrasonically (power 700W) for 60 minutes to obtain 20 mg / mL graphene oxide dispersion.

[0037] (2) Add 2 mg of carbon nanofibers (CNF) to the graphene oxide dispersion and shake for 3 minutes.

[0038] (3) Pour the mixed solution of MXene and carbon nanofibers obtained in step (2) into a hydrothermal reaction kettle. Put it into an oven to carry out a hydrothermal reaction at 100° C. for three hours.

[0039] (4) Put the solution obtained in step (...

Embodiment 3

[0043] This example adopts conductive nanomaterials and organic crosslinking agents different from those in Example 1 and Example 2, and through directional freeze-drying technology, a porous block material with a symmetrical concave honeycomb microporous structure is formed; the final conductive material is obtained by heating and roasting. Porous pressure-sensitive metamaterial products.

[0044] (1) Weigh 6ml of silver nanowire dispersion (10mg / ml) into a reagent bottle, add water to dilute to 5mg / ml, and oscillate evenly.

[0045] (2) Add 2 mg of polyvinyl alcohol (PVA, molecular weight: 120,000) to the silver nanowire dispersion, vibrate for 30 minutes and then sonicate for 30 seconds.

[0046] (3) Put the solution obtained in step (2) into a square reaction tube. Pour half of the volume of liquid nitrogen into the Dewar, and place the reaction tube above the liquid nitrogen, inside the Dewar. Wait for the solution to completely freeze.

[0047] (4) Place the solid obt...

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Abstract

The invention relates to a conductive porous pressure-sensitive metamaterial with a negative Poisson's ratio characteristic and a preparation method and application thereof, and belongs to the field of sensing material and sensing device research. The conductive nano material is mixed with an organic cross-linking agent, and hydrothermal reaction is performed to form a uniformly dispersed aqueous solution; a porous block material with a symmetrical concave honeycomb-shaped micropore structure is formed through a directional freeze-drying technology; through heating and roasting, the nanometer material and the organic cross-linking agent form a cross-linked network. When the porous metamaterial disclosed by the invention is pressed, bidirectional shrinkage is caused by the negative Poisson's ratio, so that the density of the metamaterial and the number of conductive paths are quickly increased, and the pressure-sensitive characteristic, the compression elasticity, the impact resistance and other mechanical properties of the metamaterial are remarkably improved. The invention also relates to an ultra-sensitive flexible pressure sensor based on the conductive porous metamaterial.

Description

technical field [0001] The invention relates to a preparation method and application of a porous metamaterial and a flexible pressure sensor, in particular to a preparation method of a conductive porous pressure-sensitive metamaterial with negative Poisson's ratio characteristics and an ultrasensitive pressure sensor. Materials can exhibit extraordinary mechanical properties, including excellent resistance to indentation, high load-carrying capacity, large deformation capacity, and superior fracture toughness. It can be used for the detection of pressure signals. In the case of compression, it can shrink in both longitudinal and transverse directions, thereby greatly improving sensitivity. Background technique [0002] The physical activity of the human body produces various pressure signals, such as low pressure signals generated by internal pressure such as intracranial pressure and internal jugular venous pressure, which can provide valuable information about physiologica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/18G01L9/06A61B5/00
CPCG01L1/18G01L9/06A61B5/6801A61B5/6843
Inventor 梁嘉杰史鑫磊
Owner NANKAI UNIV
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