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Magneto-chromic self-orienting photonic crystal ball and preparation method thereof

A photonic crystal, self-orientation technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of photonic crystal ball color display dependence, great influence on magnetochromic performance, poor controllability, etc., and achieve controllable structure. , Unique magnetochromic properties, simple preparation method

Active Publication Date: 2017-02-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are two problems at the same time, one: the display of the color of the photonic crystal ball depends on the magnetic field; two: its magnetochromic performance is greatly affected by the surrounding medium and the direction of the magnetic field, and the controllability is poor

Method used

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  • Magneto-chromic self-orienting photonic crystal ball and preparation method thereof
  • Magneto-chromic self-orienting photonic crystal ball and preparation method thereof
  • Magneto-chromic self-orienting photonic crystal ball and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add tannic acid and polyvinylpyrrolidone into ethylene glycol to configure a uniform mixed solution, the concentration of tannic acid is 3.33g / L, and the concentration of polyvinylpyrrolidone is 400g / L. Then add ferric chloride hexahydrate into the mixed solution, stir until completely dissolved, and the concentration of ferric ion in the solution is 4.1g / L or 8.6g / L. Finally, anhydrous sodium acetate was added to adjust the pH to 9.0. Then put it into a reaction kettle, seal it and heat it to 200°C, and keep it warm for 24 hours, then cool it down to room temperature, wash and separate it with ethanol for 2 to 3 times, and dry the solid in vacuum to obtain the product. Such as figure 1 As shown in the field emission scanning electron microscope image of the product of this example, the obtained product is 150 nm monodisperse colloidal particles.

Embodiment 2

[0034] 0.5g N-isopropylacrylamide (NIPAM), 28.6mg N-N methylenebisacrylamide (BIS), 22.8mg 2-hydroxy-2-methyl-1-phenylacetone (HMPP), 84.3mg polyethylene Glycol octyl phenyl ether (Triton X-100) was added to the ethylene glycol (EG) dispersion of the monodispersed superparamagnetic nanocrystal cluster colloidal core-shell composite particles obtained in Example 1 at 5.0 mg / mL, and ultrasonically Disperse evenly to form a pre-poly solution for later use.

[0035] Use a micro-syringe with a capacity of 1mL and a needle type of 27G to drop the prepolymerized solution into a glass vessel containing an oil phase with a viscosity of 5000cP. At this time, the emulsion drops are in a suspended state in the oil phase. After standing for half a minute, put It is directly above the circular magnet, adjust the distance between the magnet and the sample so that the magnetic field strength is 260Gs, let it stand for 30 seconds, and then turn on the UV lamp with a power of 1000W and a wavele...

Embodiment 3

[0037] In the same manner as in Example 2, after the oil phase on the surface of the photonic crystal ball was cleaned, the cleaned photonic crystal ball was transferred to a centrifuge tube filled with ethanol for solvent replacement. After 1 day, it was washed twice with ethanol, and the The product was stored in ethanol for later use. The digital photos of the obtained product without an external magnetic field are as follows: Figure 4 As shown, it shows a uniform orange-red color. and described in Example 2 figure 2 Similarly, it can still exhibit a uniform structural color in the absence of a magnetic field. It shows that the replacement of the replacement solvent does not affect the self-orientation performance of the photonic crystal sphere.

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Abstract

The invention relates to a magneto-chromic self-orienting photonic crystal ball and a preparation method thereof. Pre-polymerized liquid prepared from monodispersed superparamagnetic nano crystal druse colloid core-shell composite particles, a polymerization monomer, a cross-linking agent, a photoinitiator, a surface active agent and dispersion liquid is dropwise added to an oil phase, liquid drops are cured under the effects of an externally applied magnetic field and ultraviolet light, the photonic crystal ball is taken out after reaction, and washing and solvent replacement are performed. The magneto-chromic self-orienting photonic crystal ball has the advantages that the preparation, regulation and control method is simple and good in repeatability; a solid-liquid coexisting structure is always kept, the magneto-chromic self-orienting performance can be also kept; the mass center of the photonic crystal ball does not coincide with the center of the ball, so that the photonic crystal ball show self-developing characteristics without an externally applied magnetic field effect, more energy is saved by adopting self development compared with traditional magnetic field induced developing, and controllability is good.

Description

technical field [0001] The invention relates to the field of display material preparation, in particular to a magnetochromic self-alignment photonic crystal ball and a preparation method thereof. Background technique [0002] Photonic crystal microspheres composed of monodisperse particles produce bright structural colors due to the periodic arrangement of monodisperse particles. In particular, one-dimensional photonic crystal spheres assembled from superparamagnetic nanoparticles have attracted extensive attention from researchers at home and abroad due to their advantages such as easy assembly, high brightness, and convenient bandgap adjustment. For example, important progress has been made in the study of one-dimensional photonic crystal spheres based on superparamagnetic silica-wrapped ferric iron tetroxide core-shell particles. For example [J.Am.Chem.Soc.2009, Vol. 131, Page 15687], one-dimensional solid photonic crystal spheres with a single color can be obtained by o...

Claims

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Application Information

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IPC IPC(8): G02F1/09C08F220/54C08F222/38C08F120/06C08F2/48
CPCC08F2/48C08F120/06C08F220/54G02F1/09C08F222/385
Inventor 马会茹谈亚丽官建国刘云
Owner WUHAN UNIV OF TECH
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