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One-dimensional bowl-shaped photonic crystal and preparation method thereof

A photonic crystal and bowl-shaped technology, which is applied in the field of one-dimensional bowl-shaped photonic crystal and its preparation, can solve the problems of inability to perceive changes in the external environment, non-responsiveness, and long preparation time, and achieve shortened preparation time and good optics Effects of performance, convenient orientation, and direction of movement

Active Publication Date: 2022-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also some problems at the same time. First, the preparation takes a long time; second, they are non-responsive and cannot sense changes in the external environment.

Method used

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  • One-dimensional bowl-shaped photonic crystal and preparation method thereof
  • One-dimensional bowl-shaped photonic crystal and preparation method thereof
  • One-dimensional bowl-shaped photonic crystal 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 2-3 times, and obtain monodisperse colloidal core-shell composite particles of superparamagnetic nanocrystal clusters.

Embodiment 2

[0034] 1g N-isopropylacrylamide (NIPAM), 40.8mg N-N methylenebisacrylamide (BIS), 30.0mg 2-hydroxy-2-methyl-1-phenylacetone (HMPP), 100mg polyethylene glycol Octylphenyl ether (Triton X-100) was added to the ethylene glycol (EG) dispersion of the monodisperse superparamagnetic nanocrystalline cluster colloidal core-shell composite particles obtained in Example 1 at 5.0 mg / mL, and the ultrasonic dispersion was uniform , to form a pre-poly solution for later use.

[0035] The pre-polymerization solution and silicone oil (viscosity of 3.5 Pa.s) were filled in a micro-syringe with a volume of 1 mL and a needle type of 27G. The prepolymerization liquid is the internal phase, and the silicone oil is the external phase, and the flow rates of these two phases are adjusted to 0.5mL / h and 3mL / h respectively. The emulsion droplets with uniform particle size distribution were prepared by mutual shearing of the two phases, and the emulsion droplets flowed slowly into the petri dish along ...

Embodiment 5

[0041] The product obtained in the above-mentioned Examples 2-4 is placed in distilled water, and the reflection spectrum collected is as follows: Figure 8 shown. It can be seen from the figure that the bowl shape has stronger reflection intensity than the pot shape and the complete photonic crystal sphere.

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Abstract

The invention relates to a one-dimensional bowl-shaped photonic crystal and its preparation method, which is a heterogeneous structure with a hemispherical outer wall and a concave inner wall, which consists of a responsive polymer matrix and a one-dimensional chain structure fixed therein , the one-dimensional chain structure is formed by monodisperse colloidal core-shell composite particles of superparamagnetic nanocrystal clusters. With the pre-polymerization liquid as the internal phase and silicone oil as the external phase, the pre-polymerization liquid is sheared into emulsion droplets with uniform particle size distribution by using the microfluidic two-phase shearing technology, and the emulsion droplets slowly flow into the vessel along with the external phase. The emulsion droplets are solidified under the induction of magnetic field and the action of ultraviolet light. Compared with the prior art, the present invention has the following advantages and positive effects due to the adoption of the above technical scheme: the preparation method is simple and repeatable, the prepared photonic crystal structure has good monodispersity, and the internal assembly units are orderly High degree; the prepared bowl-shaped photonic crystal has a large specific surface area, which makes it have a faster response speed.

Description

technical field [0001] The invention relates to the field of display material preparation, in particular to a one-dimensional bowl-shaped photonic crystal and a preparation method thereof. Background technique [0002] In the field of material synthesis, the preparation of microstructures with complex shapes is still a big problem. It is well known that the performance of a material depends largely on its size, shape and surface properties. In recent years, bowl-shaped materials have attracted extensive attention from researchers due to their unique structures and properties. For example, [Crystal Growth & Design, 2014, Volume 14, Page 401] has prepared a bowl-shaped structure by a two-phase phase separation method, which can be further extended to other polymers and colloids to produce different structures. The literature [Langmuir, 2015, volume 31, page 937] forms a G-W / O double-sided emulsion droplet with good monodispersity in a coaxial microfluidic channel, and then p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/122
CPCG02B6/1225
Inventor 马会茹谈亚丽官建国
Owner WUHAN UNIV OF TECH