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A monodisperse hollow structure purple fe 3 o 4 @sio 2 Materials and Preparation Methods

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

Active Publication Date: 2021-11-05
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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  • A monodisperse hollow structure purple fe <sub>3</sub> o <sub>4</sub> @sio <sub>2</sub> Materials and Preparation Methods
  • A monodisperse hollow structure purple fe <sub>3</sub> o <sub>4</sub> @sio <sub>2</sub> Materials and Preparation Methods
  • A monodisperse hollow structure purple fe <sub>3</sub> o <sub>4</sub> @sio <sub>2</sub> Materials and Preparation Methods

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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 monodisperse hollow structure purple Fe 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 purple Fe 3 o ...

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Abstract

The invention discloses a monodisperse hollow structure purple Fe 3 o 4 @SiO 2 Material and preparation method, the material is purple under natural light, the shape is a hollow spherical structure, the inner diameter is 195-215 nm, the shell thickness is 20-15 nm, its size distribution is uniform, and it is monodisperse; polyphenylene Vinyl spheres are used as templates, through a simple hydrothermal reaction, SiO 2 Monodisperse hollow structure purple Fe can be obtained by layer coating and high temperature treatment 3 o 4 @SiO 2 Material, SiO 2 Coating effectively protects and disperses Fe 3 o 4 material, avoid Fe during heat treatment 3 o 4 Layer fragmentation and Fe 3 o 4 Adhesion between hollow spheres. The method used in the present invention has a simple operation process, easy-to-obtain raw materials, and can be synthesized in a large range, and the Mie scattering resonance of the hollow structure is not affected by the observation angle, presents a bright purple color, and has excellent stability, and is expected to be used in structural color devices. show.

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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Patent Type & Authority Patents(China)
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