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Monodisperse hollow structure purple Fe3O4@ SiO2 material and preparation method thereof

A hollow structure, monodisperse technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, fibrous fillers, etc., can solve the problem of affecting the rendering effect of things, limiting large-scale use, color matching confusion, etc. problems, to achieve the effect of overcoming complex preparation, small scale, good stability, and easy operation

Active Publication Date: 2020-08-07
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the complex preparation process of the periodic structure severely limits its large-scale use, and the design of multi-color structural colors is affected by the viewing angle. Different viewing angles have different color performances, which can easily lead to confusion in color matching and affect things. rendering effect

Method used

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  • Monodisperse hollow structure purple Fe3O4@ SiO2 material and preparation method thereof
  • Monodisperse hollow structure purple Fe3O4@ SiO2 material and preparation method thereof
  • Monodisperse hollow structure purple Fe3O4@ SiO2 material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] A monodisperse hollow structure purple Fe 3 o 4 @SiO 2 The preparation method of material comprises the following steps:

[0032] Step 1. Dissolve 80 mg ferric chloride hexahydrate, 0.60 g polyvinylpyrrolidone (PVP, molecular weight 40,000) and 3.00 g urea in 180 mL deionized water;

[0033] Step 2. Add 18 mg of polystyrene microspheres (220 nm in diameter) to step 1, stir and disperse evenly;

[0034] Step 3, the system obtained in step 2 is placed in a closed glass bottle for 90 o After reacting at C for 8 hours, centrifuge and wash, and disperse in 20 mL of absolute ethanol;

[0035] Step 4. Add 4 mL deionized water, 0.2 mL tetraethyl orthosilicate and 0.2 mL concentrated ammonia water to the system obtained in step 3, stir at room temperature for 2 hours, centrifuge, wash and dry;

[0036] Step 5, place the dried sample in step 4 in a nitrogen atmosphere for 500 o C heat treatment 3 hours, promptly obtains described monodisperse hollow structure purple Fe 3 o...

Embodiment 2

[0038] Step 1. Dissolve 80 mg ferric chloride hexahydrate, 0.60 g polyvinylpyrrolidone (PVP, molecular weight 40,000) and 3.00 g urea in 180 mL deionized water;

[0039] Step 2. Add 18 mg of polystyrene microspheres (220 nm in diameter) to step 1, stir and disperse evenly;

[0040] Step 3, the system obtained in step 2 is placed in a closed glass bottle for 90 o After reacting at C for 8 hours, centrifuge and wash, and disperse in 20 mL of absolute ethanol;

[0041] Step 4, place the dried sample in step 3 in a nitrogen atmosphere for 500 o C heat treatment for 3 hours, the transmission electron microscope picture of the obtained sample is as follows image 3 As shown, since no SiO 2Cladding, the resulting material has a thinner shell and cannot maintain a hollow structure after high temperature treatment, resulting in a more fractured structure. Due to the irregular structure, the scattering of light is chaotic, and the resonance phenomenon cannot be formed, and the final...

Embodiment 3

[0043] A kind of purple Fe with monodisperse hollow structure 3 o 4 @SiO 2 The preparation method of material comprises the following steps:

[0044] Step 1. Dissolve 78 mg ferric chloride hexahydrate, 0.90 g polyvinylpyrrolidone (PVP, molecular weight 40,000) and 3.25 g urea in 180 mL deionized water;

[0045] Step 2. Add 18 mg of polystyrene microspheres (220 nm in diameter) to step 1, stir and disperse evenly;

[0046] Step 3, the system obtained in step 2 is placed in a closed glass bottle for 80 o After reacting at C for 10 hours, centrifuge and wash, and disperse in 20 mL of absolute ethanol;

[0047] Step 4. Add 4 mL deionized water, 0.2 mL tetraethyl orthosilicate and 0.2 mL concentrated ammonia water to the system obtained in step 3, stir at room temperature for 2 hours, centrifuge, wash and dry;

[0048] Step 5, place the sample dried in step 4 in an argon atmosphere for 400 o C heat treatment 3 hours, promptly obtains described monodisperse hollow structure pu...

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Abstract

The invention discloses a monodisperse hollow structure purple Fe3O4@ SiO2 material and a preparation method thereof. The material is purple under natural light, is of a hollow sphere structure in morphology, is 195-215 nm in internal diameter, is 20-15 nm in shell thickness, is uniform in size distribution, and is monodisperse. Polystyrene ball serves as template, the monodisperse hollow structure purple Fe3O4@ SiO2 material can be obtained through simple hydrothermal reaction, SiO2 layer coating and high-temperature treatment; the Fe3O4 material is effectively protected and dispersed throughSiO2 coating, and Fe3O4 layer breaking and Fe3O4 hollow sphere adhesion in the heat treatment process are avoided. The method is simple in operation process, raw materials are easy to obtain, large-scale synthesis can be achieved, Mie scattering resonance of the hollow structure is not affected by the observation angle, bright purple is shown, stability is excellent, and the invention is expectedto be used for displaying structural color devices.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and the invention relates to a monodisperse hollow structure purple Fe 3 o 4 @SiO 2 Materials and their preparation methods. Background technique [0002] Color plays an important role in modern multimedia. Recently, the structural color produced by the interaction of light and nanostructures has attracted extensive attention due to its excellent stability. For example, periodically arranged photonic crystals exhibit bright colors that arise from coherent Bragg diffraction of special periodic structures rather than from conventional absorption mechanisms. [0003] However, the complex preparation process of the periodic structure severely limits its large-scale use, and the design of multi-color structural colors is affected by the viewing angle. Different viewing angles have different color performances, which can easily lead to confusion in color matching and affect things. ren...

Claims

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Application Information

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IPC IPC(8): C01G49/08C01B33/12C09C1/24C09C3/06B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B33/12C01G49/08C01P2004/04C01P2004/34C01P2004/62C01P2004/84C01P2004/86C09C1/24C09C3/063
Inventor 姚霞喜胡秀丽崔莹莹洪学鹍王旭红
Owner CHANGSHU INSTITUTE OF TECHNOLOGY