A kind of hydrogel photonic crystal microsphere and its preparation and application

A technology for photonic crystal microspheres and hydrogels, which is applied in the preparation of microspheres, microcapsule preparations, and material analysis by optical means, can solve the problem of reducing the accuracy and applicability of hydrogel photonic crystals, and difficult to prepare photonic crystals. Microspheres, etc.

Active Publication Date: 2019-01-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the preparation process of traditional hydrogel photonic crystals is relatively simple, the response time of hydrogel photonic crystals to small molecules is as long as tens of minutes to several hours; for example, although the process of non-spherical hydrogel photonic crystal films is simple , can be prepared quickly, but the photonic crystal film has angle dependence, and the film has different colors when viewed at different angles, which reduces the accuracy and applicability of this hydrogel photonic crystal in detection
At the same time, traditional photonic crystal microspheres based on silica and polystyrene nanoparticles are not responsive to external conditions (such as temperature, solvent, and mechanical force, etc.), and it is difficult to prepare photonic crystals that can observe color changes with the naked eye. Microspheres

Method used

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  • A kind of hydrogel photonic crystal microsphere and its preparation and application
  • A kind of hydrogel photonic crystal microsphere and its preparation and application
  • A kind of hydrogel photonic crystal microsphere and its preparation and application

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preparation example Construction

[0045] The preparation method of the photonic crystal microsphere comprises the following steps:

[0046] (1) Preparation of silica emulsion droplets: tetraethyl orthosilicate and ammonia water were uniformly dispersed in ethanol, and stirred at constant temperature for 6 hours; after the reaction, centrifugal purification was performed to obtain silica nanoparticles, and The particles are dispersed in water to obtain a suspension; the particle size of the silica nanoparticles in the suspension is 50-500 nm, preferably 200-300 nm (especially 200-250 nm), and the mass concentration is 5-20%, preferably 10-15 %; Using microfluidic technology, the aforementioned silica nanoparticle suspension is used as the dispersed phase, and the dispersed phase forms monodispersed emulsion droplets under the action of the shear force of the continuous phase dimethyl silicone oil. The flow rate of the inner water phase is 50-500 μL / h, and the flow rate of the continuous phase is 2000-6000 μL / h;...

Embodiment 1

[0057] The preparation method of the inverse opal structure hydrogel photonic crystal microspheres in this embodiment includes the following steps:

[0058] (1) Preparation of silica emulsion droplets: uniformly disperse tetraethyl orthosilicate and ammonia water in ethanol, and stir at constant temperature for 6 hours; after the reaction, centrifugal purification is performed to obtain silica nanoparticles, and the silica nanoparticles Disperse in water to obtain a suspension; the particle size of the silica nanoparticles in the suspension is 245nm, and the mass concentration is 10%; using the microfluidic technology, the above-mentioned silica nanoparticle suspension is used as the dispersed phase, in the Under the shearing force of the continuous phase dimethicone, the dispersed phase forms monodisperse emulsion droplets. The flow rate of the dispersed phase is 300 μL / h, and the flow rate of the continuous phase is 3000 μL / h; the inner diameter of the inner phase capillary ...

Embodiment 2

[0065] In the present embodiment, the preparation method of the inverse opal structure hydrogel photonic crystal microspheres includes the following steps:

[0066] (1) Preparation of silica emulsion droplets: tetraethyl orthosilicate and ammonia water were uniformly dispersed in ethanol, and stirred at constant temperature for 6 hours; after the reaction, centrifugal purification was performed to obtain silica nanoparticles, and The particles are dispersed in water to obtain a suspension; the particle size of the silica nanoparticles in the suspension is 245 nm, and the mass concentration is 10%; the microfluidic technology is adopted, and the aforementioned silica nanoparticle suspension is used as the dispersed phase, Under the shear force of the continuous phase dimethicone, the dispersed phase forms monodisperse emulsion droplets. The flow rate of the dispersed phase is 300 μL / h, and the flow rate of the continuous phase is 3000 μL / h; the inner diameter of the inner phase...

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Abstract

The invention discloses hydrogel photonic crystal microspheres, and a preparation method and an application thereof. The preparation method comprises the steps of (1) preparation of silica emulsion droplets, (2) preparation of silica photonic crystal microspheres, (3) preparation of silica-hydrogel hybrid photonic crystal microspheres, and (4) preparation of inverse-opal-structured hydrogel photonic crystal microspheres. In the step (3), acrylamide, acrylic acid, methylene bisacrylamide and a photo-initiator are allowed to penetrate into the silica photonic crystal microspheres; ultraviolet irradiation is carried out, such that acrylamide and acrylic acid monomers are cured, such that the silica-hydrogel hybrid photonic crystal microspheres are obtained. With the method provided by the invention, the obtained hydrogel photonic crystal microspheres have a three-dimensional ordered porous structure, wherein the pores have a compact hexagonal stacking ordered structure. With the method, technical problems of angle dependence and slow response to small molecules of existing hydrogel photonic crystal films can be solved.

Description

technical field [0001] The invention belongs to the field of responsive photonic crystals, and more particularly, relates to a hydrogel photonic crystal microsphere and its preparation and application. The hydrogel photonic crystal microsphere has an inverse opal structure and has both pH value and glucose rapidity response. Background technique [0002] Photonic crystal is a periodic microstructure composed of materials with different refractive indices alternately in space. Due to their unique optical properties, photonic crystals are widely used in the preparation of various optical devices such as filters, sensors, displays, etc. In addition, they also play an important role in clinical diagnosis, gene analysis, drug screening and other fields. [0003] Inverse opal-structured hydrogel photonic crystal microspheres with fast response to pH and glucose are a class of responsive polymer optical materials with a three-dimensionally ordered structure of nano-macropores. By...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02G01N21/78
CPCB01J13/02G01N21/78G01N2021/775
Inventor 朱锦涛李诚念杨亚江
Owner HUAZHONG UNIV OF SCI & TECH
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