Conductivity hydrogels composite material sensitized to humidity variation

A conductive hydrogel and composite material technology, applied in the analysis of materials, the use of electrical devices, the use of electromagnetic means, etc., can solve the problems of sudden changes in electrical properties, poor dimensional stability, and small resistance changes, and achieve a large degree of design freedom. Effect

Inactive Publication Date: 2009-03-11
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the change range of its conductivity is only 0.85-1.4mS/cm (conductive gel with Cu addition), and 4.5-2.0mS/cm (carbon fiber/graphite/conductive gel), which generally has the disadvantage of small resistance change; Moreover, they are all made into powder samples, and the dimensional stability after water absorptio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] For the preparation of carbon nanotube / polyacrylamide composite materials and devices, weigh 1 g of carbon nanotubes, 5 g of acrylamide monomer, 0.01 g of surfactant (sodium dodecyl sulfonate), and add 100 mL of deionized water in advance In the water, nitrogen is introduced to remove the oxygen in the water, and the carbon nanotubes are uniformly dispersed in the water to form a stable suspension after ultrasonic vibration for 4 hours; 0.133g of N,N methylene bisacrylamide and 160mg of tetramethylethylenediamine are added Mix 40mg ammonium persulfate and 40mg ammonium persulfate, then pour it into a pre-laid container made of porous nickel foam as the electrode, seal it and cross-linking reaction at room temperature, take out the cross-linked gel after 1h, and put it in nitrogen. Soak in saturated distilled water for 24 hours to wash away the unreacted components to obtain a soft and elastic carbon nanotube / polyacrylamide gel composite material. After ta...

Example Embodiment

[0029] Example 2:

[0030]Weigh 3.2 g of conductive carbon black and 8 g of monomeric acrylic acid, add 30 ml of water and 0.1 g of surfactant sodium lauryl sulfate after mixing, stir well and place in an ultrasonic oscillator to shake for 2 hours to achieve uniform mixing. At room temperature, add 0.2 g of N, N methylene bisacrylamide, 0.4 g of potassium persulfate and 0.4 g of sodium sulfite, and pour it into a cylindrical mold prepared with a nickel sheet on one end and a lead wire as an electrode. In the process, the other end of the mold with the same electrode is sealed, and then placed in a water bath at 80°C to react for 120 minutes; after the reaction, the shaped gel composite material is taken out, and the electrode is trimmed to obtain a conductive hydrogel composite material And devices.

[0031] Its resistivity in the wet state is 25000Ωcm, and the resistivity in the dry state is 100Ωcm, a decrease of 250 times. This is closely related to the tight boundary of the con...

Example Embodiment

[0032] Example 3

[0033] Weigh 20g of polyvinyl alcohol (PVA) (polymerization degree 1750, alcoholysis degree 99%), add 160mL deionized water, stir and warm up to complete dissolution, add 20g conductive carbon black, ultrasonically shake for 3 hours and then cool to room temperature; Add 20g of formaldehyde solution with a mass concentration of 37% as a crosslinking agent, 50g of a sulfuric acid solution with a mass concentration of 35% as a catalyst, 1g of surfactant, stir uniformly in a constant temperature water bath at 35℃, and pour into the prepared In a cylindrical mold with a nickel sheet on one end and lead wires as electrodes, seal the mold with the same electrode on the other end and cure in an oven at 60°C for 4-6 hours. The soluble PVA is partially cross-linked to form water-insoluble polyvinyl formal (PVFM) with a degree of acetal of 60%. Take out and wash away the unreacted formaldehyde and sulfuric acid. After trimming the electrode, a black, elastic Conductive po...

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PUM

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Abstract

The invention discloses a conductive hydrogel composite material which is sensitive to humidity level fluctuation, a device and a preparation method, which relates to a smart material and a device and a preparation method, wherein, the conductive hydrogel composite material and the preparation method thereof comprises four steps of dispersion of conductive filling materials, in situ polymerization, casting to be shaped and electrode trimming; the conductive hydrogel composite material and the device comprise a hydrogel which is sensitive to humidity level fluctuation, the conductive filling materials and an additive. In the process of responding to the environmental moisture change, the obtained conductive hydrogel composite material and the device can make a sensitive response to the external moisture change. The conductive hydrogel composite material and the device can obtain practical applications in the fields of biomedicine, fluid control, diffusion and permeation, intelligent machinery and the like.

Description

technical field [0001] The invention relates to an intelligent material, a device and a preparation method, in particular to a conductive hydrogel composite material sensitive to humidity changes, a device and a preparation method. Background technique [0002] Materials that are highly sensitive to moisture are humidity-sensitive elements, which usually use the changes in physical quantities (geometric dimensions, electrical properties, optical properties, thermal properties) of materials to sense the humidity of the environment during different water content changes. Among them, the hair hygrometer made by the principle of wet expansion and dry shrinkage is simple and convenient, but the size change is small, and auxiliary mechanical amplification devices are needed; Although the humidity sensor prepared by thermal phenomena has high precision, it generally has the disadvantages of expensive equipment and complicated testing. At present, the most widely used is the humidi...

Claims

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Application Information

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IPC IPC(8): G01N19/10G01B7/00
Inventor 曾尤高飞刘鹏飞赵龙赵金波吴文栋黄日勇严丽妮
Owner SHENYANG JIANZHU UNIVERSITY
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