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Magnetically-assembled photonic crystal hydrogel film, and preparation method and application thereof in air humidity sensor

A technology of photonic crystals and hydrogels, which is applied in the direction of analyzing materials through chemical reactions and analyzing materials through observing the impact on chemical indicators, etc. Time and other issues, to achieve the effect of long service life, not easy to dehydrate, good moisturizing effect

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

AI Technical Summary

Problems solved by technology

[0004] At present, the preparation of photonic crystal humidity sensor is mainly to assemble polystyrene or silica nanospheres into opal-type colloidal photonic crystals, and then infiltrate the polymer monomer solution affected by humidity into the template, however, both the assembly of colloidal photonic crystals and the infiltration of polymer solution take a long time, which limits the large-scale production
Moreover, when the polymer polymerizes between the photonic crystal templates, it will exotherm and expand, which may cause the destruction of the photonic crystal templates

Method used

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  • Magnetically-assembled photonic crystal hydrogel film, and preparation method and application thereof in air humidity sensor
  • Magnetically-assembled photonic crystal hydrogel film, and preparation method and application thereof in air humidity sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Preparation of Magnetic Field Assembly Photonic Crystal Air Humidity Sensor

[0042] The specific preparation steps are as follows:

[0043] (1) fine emulsification: weigh 450mg OA-Fe 3 O 4 The magnetic nanoparticles are sufficiently dispersed in an appropriate amount of low boiling organic solvent trichloromethane as an oil phase, and 50 mg of SDS is dissolved in 40 ml deionized water as aqueous phase, ultrasonic cell crusher of 240W is ultrasonized for 4 minutes to obtain water (O / W) fine emulsion;

[0044] (2) Silica coating: Emissions evaporate the organic solvent under normal temperature, magnetic separation to obtain magnetic nanocrystalline clusters, 1.6 g of polyvinylpyrrolidone (PVP) is dissolved in 60 mL deionized water, add 250 mg of magnetic nanocolus cluster Ultrasound 5min, 20 mL was poured into an alcohol aqueous alcohol solution (80 mL ethanol, 4 ml of ammonia, 0.9 ml teos) pre-stirred for 30 min, and stirred for 40min, washed by magnetic separa...

Embodiment 2

[0047] Example 2: Preparation of Magnetic Field Assembly Photonic Crystal Air Humidity Sensor

[0048] The specific preparation steps are as follows:

[0049] (1) fine emulsification: weigh 450mg OA-Fe 3 O 4 The magnetic nanoparticles are sufficiently dispersed in an appropriate amount of low boiling organic solvent trichloromethane as an oil phase, and 50 mg of SDS is dissolved in 40 ml deionized water as aqueous phase, ultrasonic cell crusher of 240W is ultrasonized for 4 minutes to obtain water (O / W) fine emulsion;

[0050] (2) Silica coating: Emissions evaporate the organic solvent under normal temperature, magnetic separation to obtain magnetic nanocrystalline clusters, 1.6 g of polyvinylpyrrolidone (PVP) is dissolved in 60 mL deionized water, add 250 mg of magnetic nanocolus cluster Ultrasound 5min, 20 mL was poured into an alcohol aqueous alcohol solution (80 mL ethanol, 4 ml of ammonia, 0.9 ml teos) pre-stirred for 30 min, and stirred for 40min, washed by magnetic separa...

Embodiment 3

[0053] Example 3: Preparation of Magnetic Field Assembly Photonic Crystal Air Humidity Sensor

[0054] The specific preparation steps are as follows:

[0055] (1) fine emulsification: weigh 450mg OA-Fe 3 O 4 The magnetic nanoparticles are sufficiently dispersed in an appropriate amount of low boiling organic solvent trichloromethane as an oil phase, and 50 mg of SDS is dissolved in 40 ml deionized water as aqueous phase, ultrasonic cell crusher of 240W is ultrasonized for 4 minutes to obtain water (O / W) fine emulsion;

[0056] (2) Silica coating: Emissions evaporate the organic solvent under normal temperature, magnetic separation to obtain magnetic nanocrystalline clusters, 1.6 g of polyvinylpyrrolidone (PVP) is dissolved in 60 mL deionized water, add 250 mg of magnetic nanocolus cluster Ultrasound 5min, 20 mL was poured into an alcohol aqueous alcohol solution (80 mL ethanol, 4 ml of ammonia, 0.9 ml teos) pre-stirred for 30 min, and stirred for 40min, washed by magnetic separa...

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Abstract

The invention discloses a magnetically-assembled photonic crystal hydrogel film, and a preparation method and application thereof in an air humidity sensor. According to the invention, magnetic nanoparticles Fe3O4@SiO2 are adopted as a photonic crystal construction material, and photocuring hydrogel and a glycerin humectant are introduced, so that a humidity-responsive photonic crystal hydrogel film is prepared in one step under the driving of a magnetic field, and a photonic crystal sensor capable of responding to air humidity through color change is obtained. The structural color change of the photonic crystal humidity sensor is driven by the swelling and contraction of the hydrogel, and a power supply is not needed, so that compared with an electronic hygrometer in the market, the sensor is more energy-saving and environmentally friendly, and has the advantages of simple structure, no electronic element, low failure rate and low production cost. The humectant is introduced, so that the photonic crystal humidity sensor has excellent durability and fatigue resistance, and the problem that the photonic crystal structure collapses due to the fact that a hydrogel type photonic crystal humidity sensor loses excessive moisture in a dry environment is solved.

Description

Technical field [0001] The present invention belongs to the field of magnetic assembly photonic crystal hydrogel film and humidity sensor, in particular, refers to a magnetic assembly photonic crystal hydrogel film and its preparation method thereof and its application in an air humidity sensor. Background technique [0002] Humidity monitoring due to its important role in agricultural production, weather forecast, environmental control, food storage and many chemical processes, more and more people's attention. At present, people have developed and manufactured different types of humidity sensors. They indicate humidity, such as resistance, capacitance, surface acoustic wave, diffraction, and reflection, transmittance, fluorescence emission, and cantilever beam deflection. The mass correlation frequency of the quartz crystal resonator, etc. Today, electric energy-based humidity sensors have entered commercial production and are widely used in life and production. However, in man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J3/075C08F220/56C08F222/38C08L33/26C08K9/10C08K3/22C08K5/053G01N21/81
CPCC08J5/18C08J3/075C08F220/56C08K9/10C08K3/22C08K5/053G01N21/81C08K2003/2275C08K2201/01C08K2201/011C08J2333/26C08F222/385
Inventor 曹玉华许佳晟
Owner JIANGNAN UNIV