CN114085399A - Magnetic assembly photonic crystal hydrogel film, preparation method thereof and application thereof in air humidity sensor - Google Patents
Magnetic assembly photonic crystal hydrogel film, preparation method thereof and application thereof in air humidity sensor Download PDFInfo
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Abstract
The invention relates to a magnetic assembly photonic crystal hydrogel film, a preparation method thereof and an in-space application thereofUse in a gas humidity sensor. The invention adopts magnetic nano-particle Fe3O4@SiO2As a photonic crystal construction material, the photonic crystal hydrogel film with humidity response is prepared in one step by introducing the photocuring hydrogel and the glycerin humectant under the drive of a magnetic field, and the 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 shrinking of the hydrogel, and a power supply is not needed, so that the photonic crystal humidity sensor is more energy-saving and environment-friendly compared with an electronic hygrometer on the market, and has the advantages of simple structure, no electronic element, low failure rate and low production cost. Due to the introduction of the humectant, the photonic crystal humidity sensor has excellent durability and fatigue resistance, and the problem that the hydrogel type photonic crystal humidity sensor loses excessive moisture in a dry environment to cause the collapse of a photonic crystal structure is solved.
Description
Technical Field
The invention belongs to the technical field of magnetic assembly photonic crystal hydrogel films and humidity sensors, and particularly relates to a magnetic assembly photonic crystal hydrogel film, a preparation method thereof and application thereof in an air humidity sensor.
Background
Humidity monitoring has become increasingly appreciated over the past decades due to its important role in agricultural production, weather forecasting, environmental control, food storage and many chemical processes. Currently, different types of humidity sensors have been developed and manufactured that indicate humidity by detecting some physical change in some device, such as resistance, capacitance, surface acoustic waves, diffraction and reflection, transmissivity, fluorescence emission, cantilever deflection, and mass-related frequency of a quartz crystal resonator. Nowadays, humidity sensors based on electric energy have entered commercial production and are widely used in life and production. However, in many cases, a colorimetric humidity sensor that is low in cost, convenient, visually readable, and does not require special equipment and energy sources is highly desirable.
Responsive photonic crystals are a good strategy to solve these problems because they can change the bright structural color by an external stimulus (e.g., humidity). The photonic crystal is a special optical material and is formed by periodically and alternately arranging two materials with different refractive indexes, and the structure enables the photonic crystal to have a photon forbidden band, namely, the photonic crystal can shield and reflect light waves with a specific wavelength. When the wavelength is in the visible spectrum, it is called a structural color, and by changing the arrangement period distance and the refractive index, the change in the structural color can be made recognizable by human eyes. For humidity responsive photonic crystals, this is typically achieved by introducing a humidity responsive polymer into the interstices of the colloidal filler. When the humidity response polymer absorbs water molecules in the environment, the volume of the polymer is changed, so that the lattice constant of the photonic crystal is changed along with the change of the volume of the polymer, and the structural color is also changed. Therefore, the humidity response photonic crystal is a humidity sensor which is visual and readable, has low cost and does not need an external power supply or special equipment.
At present, a photonic crystal humidity sensor is mainly prepared by assembling polystyrene or silicon dioxide nanospheres into an opal type colloidal photonic crystal by methods such as supersaturated deposition or gravity driving, and then infiltrating a polymer monomer solution influenced by humidity into a template, however, the assembly of the colloidal photonic crystal and the infiltration of the polymer solution both need a long time, and the large-scale production is limited. Moreover, the polymer, when polymerized between photonic crystal templates, can release heat and expand, potentially causing damage to the photonic crystal templates. In addition, the durability and fatigue resistance of the humidity-responsive photonic crystal sensor are also issues to be considered
Disclosure of Invention
In order to solve the technical problems, the invention provides a magnetic assembly photonic crystal hydrogel film, a preparation method thereof and application thereof in an air humidity sensor. The air humidity sensor disclosed by the invention is simple and rapid to prepare, low in cost, convenient and visual, free of specific equipment and energy, good in repeatability and durability and capable of being applied as a humidity sensor.
A preparation method of a magnetic assembly photonic crystal hydrogel film comprises the following steps:
(1) dispersing the hydrophobic magnetic nanoparticles in an organic solvent to serve as an oil phase, dissolving an emulsifier in water to serve as a water phase, mixing the oil phase and the water phase, and then finely emulsifying to obtain the oil-in-water type miniemulsion.
(2) Removing the organic solvent in the oil-in-water type miniemulsion in the step (1) to obtain a magnetic nano crystal cluster, and then modifying by using water-soluble macromolecules; the specific modification steps are as follows: and (4) adding the obtained magnetic nano crystal cluster into a water-soluble macromolecule water solution for ultrasonic treatment, wherein neutral macromolecules can replace a surfactant with negative electricity on the surface of the particle, so that silicic acid ions with the same negative electricity in the step (3) can be coated on the surface to form a silicon dioxide layer.
(3) Coating the magnetic nano crystal cluster modified in the step (2) with silicon dioxide by a sol-gel method to obtain magnetic colloidal nano particles; since magnetic nanoclusters are easily self-aggregated, silica is required for coating to obtain stable and uniform particles. In addition, the silica shell layer endows solvation force and provides repulsive force balanced with magnetic attraction force, and the key point of constructing the photonic crystal structure is.
(4) Dispersing the magnetic colloid nano particles in the step (3) in an aqueous solution containing a hydrogel monomer, a cross-linking agent, an initiator and a humectant, carrying out photo-initiated polymerization under the conditions of a magnetic field and ultraviolet light, and carrying out a photo-curing process to obtain a magnetic assembly photonic crystal hydrogel film; the monomer and the cross-linking agent form a hydrogel network, the initiator is used for initiating a polymerization reaction, and the humectant is used for keeping moisture in the photonic crystal film, expanding the humidity response range and prolonging the service life of the humidity sensor.
In an embodiment of the invention, in the step (1), the hydrophobic magnetic nanoparticles are oleic acid-modified ferroferric oxide, oleylamine-modified ferroferric oxide, or lauric acid-modified ferroferric oxide.
In one embodiment of the present invention, in step (1), the emulsifier is sodium lauryl sulfate and/or a C16-C22 alkyl trimethyl quaternary ammonium salt.
In one embodiment of the present invention, in the step (1), the mass concentration of the emulsifier is 0.075% to 0.2%.
In one embodiment of the present invention, in the step (1), the mass concentration of the hydrophobic magnetic nanoparticles is 2.5% -12.5%.
In one embodiment of the present invention, in the step (1), the organic solvent is a low boiling point organic solvent.
In one embodiment of the present invention, the low boiling point organic solvent is selected from one or more of chloroform, ethyl acetate, n-hexane, and cyclohexane.
In one embodiment of the present invention, in the step (1), the volume ratio of the oil phase to the water phase is 1: 10-16.
In one embodiment of the invention, in the step (1), the fine emulsification is performed by ultrasonic fine emulsification for 1-5min by an ultrasonic cell disruptor with power of 120-72W.
In one embodiment of the present invention, in the step (2), the water-soluble macromolecule is one or more of polyvinylpyrrolidone, N-methylpyrrolidone and cellulose.
In one embodiment of the present invention, in the step (2), the organic solvent removal is performed by means of reduced pressure rotary evaporation, provided that the temperature is 35 ℃ to 45 ℃ and the rotation speed is 100rpm to 150 rpm.
In one embodiment of the present invention, in the step (3), the silica coating is performed in tetraethyl orthosilicate (TEOS).
In one embodiment of the present invention, in the step (4), the hydrogel monomer is acrylamide and/or N-isopropylacrylamide, and the mass concentration is 10 wt% to 15 wt%.
In one embodiment of the present invention, in the step (4), the photoinitiator is 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone and/or 2-hydroxy-2-methyl-1-phenyl-1-propanone, and the mass concentration is 0.5 wt% to 1.0 wt%.
In one embodiment of the invention, in the step (4), the humectant is glycerol and the mass concentration is 60 wt% to 80 wt%.
In one embodiment of the present invention, in the step (4), the crosslinking agent is N, N-methylene bisacrylamide and/or diethylenetriamine.
In one embodiment of the present invention, in step (4), the power of the ultraviolet light source is 200W-300W, and the curing time is 60s-120 s.
In one embodiment of the present invention, in the step (4), the condition of the magnetic field is a magnetic field strength of 100mT-200 mT.
The invention also provides the magnetic assembly photonic crystal hydrogel film prepared by the preparation method.
The invention also provides application of the magnetic assembly photonic crystal hydrogel film in preparation of an air humidity sensor.
The synthesis steps of the air humidity sensor are as follows: the magnetic assembled photonic crystal hydrogel film is stuck on a humidity colorimetric card and can be used as an air humidity sensor. The color of the film changes from purple to red along with the increase of the air humidity, and the humidity value is read through the color comparison card.
According to the invention, a miniemulsion method and a sol-gel method are combined to synthesize superparamagnetic colloidal nanoparticles with adjustable particle size, and a long-term effective photonic crystal air humidity sensor is prepared by taking humidity response hydrogel as a substrate and glycerol as a humectant. When the air humidity changes, the structural color of the humidity sensor also changes, and the numerical value of the air humidity can be conveniently read out through the established color comparison card. The photonic crystal humidity sensor is simple to prepare, low in cost, convenient to use, good in durability and fatigue resistance, and capable of achieving colorimetric detection of air humidity.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the invention quickly prepares the superparamagnetic ferroferric oxide nano particles by a miniemulsion method and reduced pressure distillation. And then the stable and uniform magnetic colloid nano particles are synthesized by modifying the nonionic polymer and coating the silicon dioxide, and are used for preparing the magnetic assembly photonic crystals.
2. The invention adopts polyacrylamide hydrogel as a film material, and can quickly respond to water. And the glycerol is used as the humectant, so that the response range of the film to the air humidity is wider.
3. The invention constructs photonic crystal through magnetic assembly and fixes the photonic crystal structure by hydrogel, wherein the photonic crystal is an optical material formed by two materials with different refractive indexes which are alternately arranged, and the photonic crystal has a photon forbidden band structure and can reflect light with specific wavelength. Conversely, when the air humidity decreases, the reflected wavelength shifts to a shorter wavelength, and the color turns blue. And establishing a humidity colorimetric card by the relationship between the air humidity and the color of the humidity response photonic crystal hydrogel. The color of the hydrogel is compared with a color comparison card, and the numerical value of the air humidity can be read. The invention adopts the glycerol as the humectant, and compared with the glycol, the humectant has better moisturizing effect and longer service life of the hydrogel. Because the hydroxyl in the glycerol is rich and has certain viscosity, when the film is placed in a dry environment, excessive dehydration and collapse of a photonic crystal structure are less prone to happen, and in a humid environment, the hydrogel is assisted to absorb moisture in the air.
4. The magnetic field assembled photonic crystal humidity response film prepared by the invention can respond to air humidity within the range of 15% -95%. Meanwhile, the response structure can be placed for more than 20 days, and the change of the color wavelength is small, so that the fatigue resistance and the durability are good.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a chart showing the wavelength and structural color changes of the humidity responsive film of the magnetically assembled photonic crystal in different humidity environments, the relationship between the wavelength and humidity of the structural color, and a color comparison card;
FIG. 2 is a schematic diagram of the response to air humidity and sensor product after the photonic crystal humidity sensor of the present invention is placed for 20 days.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example 1: preparation of magnetic field assembled photonic crystal air humidity sensor
The preparation method comprises the following specific steps:
(1) fine emulsification: weighing 450mg of OA-Fe3O4Fully dispersing magnetic nanoparticles in a proper amount of low-boiling organic solvent chloroform to serve as an oil phase, dissolving 50mg SDS in 40mL of deionized water to serve as a water phase, and ultrasonically finely emulsifying for 4min by using an ultrasonic cell disruption instrument with the power of 240W to obtain an oil-in-water (O/W) type miniemulsion;
(2) coating with silicon dioxide: evaporating the organic solvent from the miniemulsion under reduced pressure at normal temperature, carrying out magnetic separation to obtain magnetic nano crystal clusters, dissolving 1.6g of polyvinylpyrrolidone (PVP) in 60mL of deionized water, adding 250mg of magnetic nano clusters, carrying out ultrasonic treatment for 5min, pouring 20mL of the solution into an alcohol-water solution (80mL of ethanol, 4mL of ammonia water and 0.9mL of TEOS) which is stirred for 30min in advance, continuing stirring for 40min, and carrying out magnetic separation and multiple water washing to obtain magnetic colloidal nanoparticles coated with silicon dioxide;
(3) magnetic field assembly photonic crystal air humidity response film: mixing and dissolving 10 wt% of acrylamide monomer, 75 wt% of glycerol, photoinitiator 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone and crosslinking agent N, N-methylene bisacrylamide in water, adding 3mg/mL of the magnetic colloid nano particles, uniformly mixing, injecting the mixture between two clean glass sheets, and carrying out UV 300W photocuring for 90s at the temperature of 100mT to obtain the photonic crystal air humidity response film.
(4) Photonic crystal air humidity sensor: and the photonic crystal air humidity response film and the air humidity colorimetric card form a humidity sensor for detecting air humidity.
Example 2: preparation of magnetic field assembled photonic crystal air humidity sensor
The preparation method comprises the following specific steps:
(1) fine emulsification: weighing 450mg of OA-Fe3O4Fully dispersing magnetic nanoparticles in a proper amount of organic solvent trichloromethane with low boiling point to serve as an oil phase, dissolving 50mg SDS in 40mL of deionized water to serve as a water phase, and ultrasonically finely emulsifying for 4min by using an ultrasonic cell disruption instrument with the power of 240W to obtain an oil-in-water (O/W) type miniemulsion;
(2) coating with silicon dioxide: evaporating the organic solvent from the miniemulsion under reduced pressure at normal temperature, carrying out magnetic separation to obtain magnetic nano crystal clusters, dissolving 1.6g of polyvinylpyrrolidone (PVP) in 60mL of deionized water, adding 250mg of magnetic nano clusters, carrying out ultrasonic treatment for 5min, pouring 20mL of the solution into an alcohol-water solution (80mL of ethanol, 4mL of ammonia water and 0.9mL of TEOS) which is stirred for 30min in advance, continuing stirring for 40min, and carrying out magnetic separation and multiple water washing to obtain magnetic colloidal nanoparticles coated with silicon dioxide;
(3) magnetic field assembly photonic crystal air humidity response film: mixing and dissolving 12 wt% of acrylamide monomer, 70 wt% of glycerol, photoinitiator 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone and crosslinking agent N, N-methylene bisacrylamide in water, adding 3mg/mL of the magnetic colloid nano particles, uniformly mixing, injecting the mixture between two clean glass sheets, and carrying out UV 200W photocuring for 90s at the temperature of 100mT to obtain the photonic crystal air humidity response film.
(4) Photonic crystal air humidity sensor: and the photonic crystal air humidity response film and the air humidity colorimetric card form a humidity sensor for detecting air humidity.
Example 3: preparation of magnetic field assembled photonic crystal air humidity sensor
The preparation method comprises the following specific steps:
(1) fine emulsification: weighing 450mg of OA-Fe3O4Fully dispersing magnetic nanoparticles in a proper amount of low-boiling organic solvent chloroform to serve as an oil phase, dissolving 50mg SDS in 40mL of deionized water to serve as a water phase, and ultrasonically finely emulsifying for 4min by using an ultrasonic cell disruption instrument with the power of 240W to obtain an oil-in-water (O/W) type miniemulsion;
(2) coating with silicon dioxide: evaporating the organic solvent from the miniemulsion under reduced pressure at normal temperature, carrying out magnetic separation to obtain magnetic nano crystal clusters, dissolving 1.6g of polyvinylpyrrolidone (PVP) in 60mL of deionized water, adding 250mg of magnetic nano clusters, carrying out ultrasonic treatment for 5min, pouring 20mL of the solution into an alcohol-water solution (80mL of ethanol, 4mL of ammonia water and 0.9mL of TEOS) which is stirred for 30min in advance, continuing stirring for 40min, and carrying out magnetic separation and multiple water washing to obtain magnetic colloidal nanoparticles coated with silicon dioxide;
(3) magnetic field assembly photonic crystal air humidity response film: mixing and dissolving 12 wt% of acrylamide monomer, 75 wt% of glycerol, photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone and cross-linking agent N, N-methylene bisacrylamide in water, adding 3mg/mL of the magnetic colloid nano particles, uniformly mixing, injecting the mixture between two clean glass sheets, and carrying out UV 200W photocuring for 90s at 120mT to obtain the photonic crystal air humidity response film.
(4) Photonic crystal air humidity sensor: and the photonic crystal air humidity response film and the air humidity colorimetric card form a humidity sensor for detecting air humidity.
Example 4: preparation of magnetic field assembled photonic crystal air humidity sensor
The preparation method comprises the following specific steps:
(1) fine emulsification: weighing 450mg of OA-Fe3O4Fully dispersing magnetic nanoparticles in a proper amount of low-boiling organic solvent chloroform to serve as an oil phase, dissolving 50mg SDS in 40mL of deionized water to serve as a water phase, and ultrasonically finely emulsifying for 4min by using an ultrasonic cell disruption instrument with the power of 240W to obtain an oil-in-water (O/W) type miniemulsion;
(2) coating with silicon dioxide: evaporating the organic solvent from the miniemulsion under reduced pressure at normal temperature, carrying out magnetic separation to obtain magnetic nano crystal clusters, dissolving 1.6g of polyvinylpyrrolidone (PVP) in 60mL of deionized water, adding 250mg of magnetic nano clusters, carrying out ultrasonic treatment for 5min, pouring 20mL of the solution into an alcohol-water solution (80mL of ethanol, 4mL of ammonia water and 0.9mL of TEOS) which is stirred for 30min in advance, continuing stirring for 40min, and carrying out magnetic separation and multiple water washing to obtain magnetic colloidal nanoparticles coated with silicon dioxide;
(3) magnetic field assembly photonic crystal air humidity response film: mixing and dissolving 12 wt% of acrylamide monomer, 80 wt% of glycerol, a photoinitiator 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone and a crosslinking agent diethylenetriamine in water, adding 3mg/mL of the magnetic colloid nano particles, uniformly mixing, injecting the mixture between two clean glass sheets, and carrying out UV 250W photocuring for 90s at the temperature of 100mT to obtain the photonic crystal air humidity response film.
(4) Photonic crystal air humidity sensor: and the photonic crystal air humidity response film and the air humidity colorimetric card form a humidity sensor for detecting air humidity.
Example 5: preparation of magnetic field assembled photonic crystal air humidity sensor
The preparation method comprises the following specific steps:
(1) fine emulsification: weighing 450mg of OA-Fe3O4Fully dispersing magnetic nanoparticles in a proper amount of low-boiling organic solvent chloroform to serve as an oil phase, dissolving 50mg SDS in 40mL of deionized water to serve as a water phase, and ultrasonically finely emulsifying for 4min by using an ultrasonic cell disruption instrument with the power of 240W to obtain an oil-in-water (O/W) type miniemulsion;
(2) coating with silicon dioxide: evaporating the organic solvent from the miniemulsion under reduced pressure at normal temperature, carrying out magnetic separation to obtain magnetic nano crystal clusters, dissolving 1.6g of polyvinylpyrrolidone (PVP) in 60mL of deionized water, adding 250mg of magnetic nano clusters, carrying out ultrasonic treatment for 5min, pouring 20mL of the solution into an alcohol-water solution (80mL of ethanol, 4mL of ammonia water and 0.9mL of TEOS) which is stirred for 30min in advance, continuing stirring for 40min, and carrying out magnetic separation and multiple water washing to obtain magnetic colloidal nanoparticles coated with silicon dioxide;
(3) magnetic field assembly of photonic crystal air humidity response film: mixing and dissolving 15 wt% of acrylamide monomer, 75 wt% of glycerol, 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone serving as a photoinitiator and N, N-methylene bisacrylamide serving as a cross-linking agent in water, adding 3mg/mL of the magnetic colloid nano particles, uniformly mixing, injecting the mixture between two clean glass sheets, and carrying out UV 200W photocuring for 90s at 150mT to obtain the photonic crystal air humidity response film.
(4) Photonic crystal air humidity sensor: and the photonic crystal air humidity response film and the air humidity colorimetric card form a humidity sensor for detecting air humidity.
Test example 1:
the humidity response film of the magnetically assembled photonic crystal prepared in example 1 responds to different air humidity, and the structural color and the corresponding reflection wavelength are shown in fig. 1-a and fig. 1-b. It can be seen that as the air humidity increased from 11% to 93%, the structural color of the photonic crystal humidity responsive film changed from violet to red, while the wavelength of the structural color red shifted from 436nm to 652 nm. The photonic crystal humidity response film has a wide range of response to air humidity. The corresponding relationship between the air humidity and the wavelength of the structural color is shown in fig. 1-d, so that the color chart shown in fig. 1-c can be established through the linear relationship, and the air humidity can be read through the comparison of the structural color and the color chart. Convenient, quick and visual, and does not need specific equipment and energy.
Application example 4:
the method for obtaining the air humidity sensor by applying the magnetically-assembled photonic crystal humidity response film comprises the following steps:
the humidity responsive film of the magnetic assembly photonic crystal of example 1 is placed on a specific color chart, as shown in fig. 2-b, and the value of the air humidity can be read by comparing the structural color with the standard color chart below. In addition, as shown in fig. 2-a, the air humidity sensor still had an accurate response to air humidity after being left for at least 20 days, demonstrating good durability.
Comparative example 1:
according to the preparation method of example 1, except that when the concentration of glycerol in the specific preparation step is 45 wt%, after curing under ultraviolet irradiation, the film has a weak moisturizing effect due to the low concentration of glycerol, and the structural color has a narrow variation range. When the air humidity is changed from 11% to 93%, the reflection wavelength of the photonic crystal film is increased from 235nm to 468nm, and when the air humidity is 11%, the reflection wavelength of the photonic crystal film reaches an ultraviolet region and cannot be recognized by human eyes.
Comparative example 2:
according to the preparation method of example 1, except that the magnetic field strength is 300mT in the photocuring in the specific preparation steps, the particle distance is too small due to the excessive magnetic field strength, the initial reflection wavelength of the humidity response photonic crystal film is 326nm, and when the air humidity is 93%, the reflection wavelength is 513nm, the change range of the reflection wavelength becomes small.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A preparation method of a magnetic assembly photonic crystal hydrogel film is characterized by comprising the following steps:
(1) dispersing hydrophobic magnetic nanoparticles in an organic solvent to serve as an oil phase, dissolving an emulsifier in water to serve as a water phase, mixing the oil phase and the water phase, and then finely emulsifying to obtain an oil-in-water type miniemulsion;
(2) removing the organic solvent in the oil-in-water type miniemulsion in the step (1) to obtain a magnetic nano crystal cluster, and then replacing the emulsifier with negative charges on the surface by using neutral water-soluble macromolecules;
(3) coating the magnetic nano crystal cluster modified in the step (2) with silicon dioxide by a sol-gel method to obtain magnetic colloidal nano particles;
(4) and (3) dispersing the magnetic colloid nano particles in the step (3) in an aqueous solution containing a hydrogel monomer, a cross-linking agent, an initiator and a humectant, and carrying out photo-initiated polymerization under the conditions of a magnetic field and ultraviolet light to obtain the magnetic assembly photonic crystal hydrogel film.
2. The preparation method according to claim 1, characterized in that in the step (1), the hydrophobic magnetic nanoparticles are oleic acid-modified ferroferric oxide, oleylamine-modified ferroferric oxide or lauric acid-modified ferroferric oxide.
3. The method according to claim 1, wherein in the step (1), the emulsifier is sodium lauryl sulfate and/or a C16-C22 alkyl trimethyl quaternary ammonium salt.
4. The preparation method according to claim 1, wherein in the step (1), the mass concentration of the hydrophobic magnetic nanoparticles is 2.5% -12.5%.
5. The method according to claim 1, wherein in the step (2), the water-soluble macromolecule is one or more of polyvinylpyrrolidone, N-methylpyrrolidone, and cellulose.
6. The method according to claim 1, wherein in the step (4), the hydrogel monomer is acrylamide or/and N-isopropylacrylamide.
7. The method according to claim 1, wherein in the step (4), the photoinitiator is 2-hydroxy-4- (2-hydroxyethoxy) -2-methylpropiophenone and/or 2-hydroxy-2-methyl-1-phenyl-1-propanone.
8. The method according to claim 1, wherein in the step (4), the humectant is glycerin.
9. A magnetically-assembled photonic crystal hydrogel thin film obtained by the method of any one of claims 1 to 8.
10. Use of the magnetically assembled photonic crystal hydrogel film as claimed in claim 9 in the manufacture of a magnetically assembled photonic crystal air humidity sensor.
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| CN115197359A (en) * | 2022-07-14 | 2022-10-18 | 河北工程大学 | Water-retaining agent with repeated moisture absorption and release functions and preparation method thereof |
| CN115260528A (en) * | 2022-07-15 | 2022-11-01 | 大连理工大学 | Magnetic hydrogel material capable of repeatedly developing color and preparation method thereof |
| CN116693748A (en) * | 2023-04-23 | 2023-09-05 | 扬州大学 | Fe (Fe) 3 O 4 @SiO 2 Preparation method and application of photonic crystal organogel |
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| CN102269693A (en) * | 2011-07-14 | 2011-12-07 | 中国科学技术大学 | Photonic crystal humidity sensor and preparation method thereof |
| CN104672485A (en) * | 2015-02-13 | 2015-06-03 | 华中科技大学 | Photonic crystal thin film as well as preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102269693A (en) * | 2011-07-14 | 2011-12-07 | 中国科学技术大学 | Photonic crystal humidity sensor and preparation method thereof |
| CN104672485A (en) * | 2015-02-13 | 2015-06-03 | 华中科技大学 | Photonic crystal thin film as well as preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115197359A (en) * | 2022-07-14 | 2022-10-18 | 河北工程大学 | Water-retaining agent with repeated moisture absorption and release functions and preparation method thereof |
| CN115260528A (en) * | 2022-07-15 | 2022-11-01 | 大连理工大学 | Magnetic hydrogel material capable of repeatedly developing color and preparation method thereof |
| CN116693748A (en) * | 2023-04-23 | 2023-09-05 | 扬州大学 | Fe (Fe) 3 O 4 @SiO 2 Preparation method and application of photonic crystal organogel |
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