Preparation method of electric and magnetic dual-response color-changing device

Abstract

The invention discloses a preparation method of an electric and magnetic dual-response color-changing device, and relates to a preparation method of an intelligent color-changing device. The technical problems that an existing intelligent color-changing material is single in response mechanism and limited in application scene are solved. Conductive surfaces of two pieces of ITO transparent conductive glass with the same resistance value are oppositely placed, an electrolyte solution and Fe3O4 at C nanoparticles are mixed and then placed between the two pieces of ITO glass, then the peripheries of the glass are sealed by using ultraviolet curing glue to ensure the airtightness of the device, and the electric and magnetic dual-response color-changing device is obtained. The color-changing device prepared by the invention can realize color change under the stimulation of an electric field and a magnetic field, so that the application range of an intelligent color-changing material is expanded, a more flexible and efficient regulation and control mode is provided, and the color-changing device has diversified response mechanisms and wide application prospects and is suitable for popularization and application. The method is suitable for multifunctional application in intelligent display, adjustable optical equipment and other fields.

Description

Technical Field

[0001] The invention relates to a method for preparing an intelligent color-changing device. Background Art

[0002] Smart color-changing materials are a type of functional materials that can automatically adjust their color or optical properties according to external environmental stimuli (such as light, temperature, electric field, pressure, humidity or chemical environment). According to different external stimuli, smart color-changing materials can be divided into photochromic, electrochromic, thermochromic and mechanochromic types. Since the optical intensity and heating intensity are difficult to accurately control, smart color-changing devices that use magnetic fields, electric fields and force fields as control sources show a wider prospect in various application scenarios, such as sensors, optical switches, displays, wearable devices, etc. For example, the application of electrochromic materials in smart windows can adjust the transmittance of visible light and infrared light of windows through an external electric field, thereby realizing dynamic control of indoor temperature and reducing building energy consumption; magnetochromic materials can be used in sensors. When stimulated by an external magnetic field, the color of the material will change accordingly according to the intensity of the magnetic field, significantly improving the sensitivity of the sensor. Although smart color-changing materials can all produce color-changing effects, their color-changing principles are quite different. Electrochromic materials usually have different colors in the oxidized and reduced states of the material itself. When an electric current passes through, the redox reaction occurs and the material gains or loses electrons, which results in a color change. Magnetic color-changing materials mostly use nanoparticles with uniform morphology to self-assemble into an ordered three-dimensional photonic crystal structure under the action of a magnetic field. When the magnetic field size is adjusted, the spacing between the nanoparticles changes, and the photonic crystal displays different colors. Most current smart color-changing materials rely on a single stimulus source to adjust their optical properties. This single stimulus source application method limits the application potential of color-changing materials in multiple scenarios, and it is difficult to meet the demand for color-changing performance under conditions with harsh electrical and magnetic environments. Summary of the invention

[0003] The present invention aims to solve the technical problems of the existing intelligent color-changing materials having a single response mechanism and limited application scenarios, and to provide a method for preparing an electric and magnetic dual-response color-changing device.

[0004] The preparation method of the electric and magnetic dual response color-changing device of the present invention is carried out according to the following steps:

[0005] Place the conductive surfaces of two ITO transparent conductive glasses with the same resistance value opposite to each other, and add electrolyte solution and Fe 3 O 4 @C After the nanoparticles are mixed, they are placed between two pieces of ITO glass. UV-curing glue is then used to seal the glass on all sides to ensure the airtightness of the device, thus obtaining an electric and magnetic dual-response color-changing device.

[0006] The present invention uses Fe with certain magnetism and electronegativity 3 O 4 @C nanoparticles are encapsulated in the device, Fe 3 O 4 It has a certain magnetism and can respond to external magnetic fields, while the outer C layer has a certain electronegativity and can respond to electric fields. When an electric field is applied, the C layer will carry magnetic particles to the electrode side to achieve color change; when a magnetic field is applied, the magnetic Fe 3 O 4 The outer layer C is carried and arranged into a photonic crystal through the magnetic force between the particles, thereby achieving color change. After applying different electric and magnetic fields, the device will produce obvious color changes, and the electric and magnetic dual response color changes are reversible.

[0007] The color-changing device prepared by the present invention can achieve color change under the stimulation of electric field and magnetic field (only one of them is enough), innovatively realizes the adjustment of optical properties under the dual stimulation of electric field and magnetic field, thereby expanding the application scope of smart color-changing materials, providing a more flexible and efficient regulation method, having diversified response mechanisms and broad application prospects, and is suitable for smart displays, adjustable optical devices and multifunctional applications in other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram of the structure of the electric and magnetic dual-response color-changing device prepared by the present invention;

[0009] Figure 2 Schematic diagram of the electric and magnetic dual-response color-changing device prepared by the present invention before and after color change;

[0010] Figure 3 The electric and magnetic dual-response color-changing device prepared for experiment 1 was subjected to electric and magnetic response conditions and the corresponding color changes;

[0011] Figure 4 This is the spectrum corresponding to the electric and magnetic responses of the electric and magnetic dual-response color-changing device prepared in experiment 1. DETAILED DESCRIPTION

[0012] Specific implementation method 1: This implementation method is a method for preparing an electric and magnetic dual-response color-changing device, which is specifically carried out according to the following steps:

[0013] Place the conductive surfaces of two ITO transparent conductive glasses with the same resistance value opposite to each other, and add electrolyte solution and Fe 3 O 4 @C After the nanoparticles are mixed, they are placed between two pieces of ITO glass. Then, UV-curing glue is used to seal the four sides of the glass to ensure the airtightness of the device. The glue is completely cured under UV light to form a closed cavity, thus obtaining an electric and magnetic dual-response color-changing device.

[0014] Specific implementation method 2: This implementation method is different from the specific implementation method 1 in that: the Fe 3 O 4 The preparation method of @C nanoparticles is as follows: in an oxygen-free environment protected by inert gas, ferric chloride, sodium hydroxide, polyacrylic acid and diethylene glycol are mixed in a molar ratio of 1:(1-500):(1-10000):(1-1000) and heated to obtain Fe with magnetic properties. 3 O 4 Nanoparticles; Fe with magnetic properties 3 O 4 Nanoparticles were dissolved in water, and then formaldehyde, ammonia and resorcinol were added. 3 O 4 The molar ratio of nanoparticles, formaldehyde, ammonia water and resorcinol is 1:(1-200):(1-200):(1-50), and the surface coating reaction is carried out under stirring conditions for 24 hours, and then washed, centrifuged, dried, and calcined at 500℃~800℃ to obtain Fe 3 O 4 @C composite particles. Other aspects are the same as those of the first embodiment.

[0015] Specific embodiment 3: This embodiment is different from specific embodiment 1 or 2 in that: the electrolyte solution is LiClO 4 The rest is the same as that of the first or second embodiment.

[0016] Specific embodiment 4: This embodiment differs from specific embodiment 3 in that: the LiClO 4 The concentration of the solution is 0.001 mol / L to 1 mol / L. The rest is the same as the third embodiment.

[0017] Specific implementation mode 5: This implementation mode is different from the specific implementation mode 4 in that: the Fe 3 O 4 @C nanoparticles and LiClO 4 The molar ratio of is 1: 1000. Others are the same as those in the fourth embodiment.

[0018] Specific embodiment 6: This embodiment is different from the specific embodiment 1 in that solid SiO needs to be evenly sprinkled between the two ITO transparent conductive glasses. 2 The microspheres are used as spacers, and the thickness of the spacers is 10 μm to 50 μm to ensure the stability of the cavity structure. The rest is the same as the first embodiment.

[0019] Specific implementation method 7: This implementation method is different from specific implementation method 6 in that the glue is completely cured and a closed cavity is formed by irradiating the glue under ultraviolet light for 10 to 15 minutes. The rest is the same as specific implementation method 6.

[0020] The present invention is verified by the following tests:

[0021] Experiment 1: This experiment is a method for preparing an electric and magnetic dual-response color-changing device, which is specifically carried out in the following steps:

[0022] 1. Preparation of raw materials: In an oxygen-free environment protected by argon, sodium hydroxide, polyacrylic acid, ferric chloride and diethylene glycol were mixed evenly in a molar ratio of 1:200:8000:500, and heated at 100°C for 5 hours. After the reaction was completed, it was cooled to room temperature to generate Fe with magnetic properties. 3 O 4 Nanoparticles; Fe with magnetic properties 3 O 4 Nanoparticles were dissolved in water, and then formaldehyde, ammonia and resorcinol were added. 3 O 4 The molar ratio of nanoparticles, formaldehyde, ammonia water and resorcinol is 1:(1-200):(1-200):(1-50). After the surface coating reaction is carried out under stirring conditions for 24 hours, the particles are alternately washed with deionized water and anhydrous ethanol, and impurities are removed by high-speed centrifugation. The obtained nanoparticles are dried and calcined in a tubular furnace, and the temperature is increased to 700°C at a rate of 5°C / min and kept at this temperature for 4 hours, and then cooled to room temperature at a rate of 5°C / min to obtain Fe 3 O 4 @C composite particles; finally, Fe 3 O 4 @C composite particles and electrolyte LiClO 4 The solution (concentration 0.1 mol / L) was thoroughly mixed, and Fe 3 O 4 @C nanoparticles and LiClO 4 The molar ratio of is 1:1000, and after stirring and dispersing, a functional nanoparticle suspension having electric field and magnetic field response characteristics is prepared;

[0023] 2. Assembly of color-changing device

[0024] 2.1 Cavity construction

[0025] Two pieces of ITO transparent conductive glass with the same size and the same resistance value are prepared, and after cleaning, surface organic pollutants are further removed using a plasma cleaner;

[0026] Place two pieces of glass with conductive surfaces facing each other and evenly sprinkle solid SiO2 Microspheres are used as spacers with a thickness of 40 μm to ensure the stability of the cavity structure. UV curing glue is evenly coated along the edge of the glass, leaving a small opening when coating the glue, and then placed under a UV lamp for 15 minutes to completely cure the glue and form a closed cavity.

[0027] 2.2 Material injection

[0028] Use a syringe to inject the functional nanoparticle suspension prepared in step 1 into the cavity through the small opening left in 2.1 until the cavity is completely filled; then tap the edge of the device to expel the bubbles in the cavity to ensure that the suspension is in full contact with the conductive surface of the ITO conductive glass; seal the small injection opening with UV curing glue, and cure it again under UV light to ensure the airtightness of the device, thereby obtaining an electric and magnetic dual-response color-changing device. Figure 1 Schematic diagram, the blue circle is Fe 3 O 4 @C composite particles.

[0029] Figure 3 The electric and magnetic dual-response color-changing device prepared for experiment 1 was subjected to electric and magnetic response conditions and corresponding color changes. It can be seen that its color changes significantly under the stimulation of electric and magnetic fields, and it can return to its original state by simply turning off the electric and magnetic fields.

[0030] Figure 4 The spectra of the electric and magnetic responses of the prepared electric and magnetic dual-response color-changing device for experiment 1, the stimulation conditions and Figure 3 same.

Claims

1. A method for preparing an electric and magnetic dual-response color-changing device, characterized in that The preparation method of the electric and magnetic dual response color-changing device is carried out according to the following steps: The conductive surfaces of two ITO transparent conductive glasses with the same resistance value are placed opposite to each other, and the electrolyte solution and Fe3O4@C nanoparticles are mixed and placed between the two ITO glasses. Then, ultraviolet curing glue is used to seal the four sides of the glass to ensure the airtightness of the device. The glue is completely cured under ultraviolet light to form a closed cavity, thereby obtaining an electric and magnetic dual-response color-changing device.

2. The method for preparing an electric and magnetic dual-response color-changing device according to claim 1, characterized in that The preparation method of the Fe3O4@C nanoparticles is as follows: in an oxygen-free environment protected by inert gas, ferric chloride, sodium hydroxide, polyacrylic acid and diethylene glycol are mixed and heated in a molar ratio of 1:(1-500):(1-10000):(1-1000) to obtain Fe3O4 nanoparticles with magnetic properties; the Fe3O4 nanoparticles with magnetic properties are dissolved in water, and then formaldehyde, ammonia water and resorcinol are added, wherein the molar ratio of the Fe3O4 nanoparticles, formaldehyde, ammonia water and resorcinol is 1:(1-200):(1-200):(1-50), surface coating reaction is carried out under stirring conditions for 24 hours, and then the mixture is washed, centrifuged, dried, and calcined at 500°C-800°C to obtain Fe3O4@C composite particles.

3. The method for preparing an electric and magnetic dual-response color-changing device according to claim 1, characterized in that The electrolyte solution is LiClO4 solution.

4. The method for preparing an electric and magnetic dual-response color-changing device according to claim 3, characterized in that The concentration of the LiClO4 solution is 0.001 mol / L to 1 mol / L.

5. The method for preparing an electric and magnetic dual-response color-changing device according to claim 4, characterized in that The molar ratio of the Fe3O4@C nanoparticles to LiClO4 is 1:1000.

6. The method for preparing an electric and magnetic dual-response color-changing device according to claim 1, characterized in that Solid SiO2 microspheres need to be evenly sprinkled between the two ITO transparent conductive glasses as spacers, with a spacing thickness of 10 μm to 50 μm to ensure the stability of the cavity structure.

7. The method for preparing an electric and magnetic dual-response color-changing device according to claim 1, characterized in that Irradiate under UV light for 10 to 15 minutes to completely cure the glue and form a closed cavity.

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