Hydrogel photonic crystal microspheres, and preparation method and application thereof
A technology of photonic crystal microspheres and hydrogels, which is applied in the preparation of microspheres, microcapsule preparations, and material analysis through optical means, and can solve the problem of reducing the accuracy and applicability of hydrogel photonic crystals and making it difficult to prepare photonic crystals microspheres etc.
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[0045] The preparation method of the photonic crystal microsphere includes the following steps:
[0046] (1) Preparation of silicon dioxide emulsion droplets: disperse tetraethyl orthosilicate and ammonia water evenly in ethanol and stir at constant temperature for 6 hours; after the reaction is completed, silica nanoparticles are obtained by centrifugal purification. The particles are dispersed in water to obtain a suspension; the particle size of the silica nanoparticles in the suspension is 50-500nm, preferably 200-300nm (especially 200nm-250nm), 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 monodisperse emulsion droplets under the shear force of the continuous phase dimethyl silicone oil. The flow rate of the internal water phase is 50-500 μL / h, and the flow rate of the continuous phase is 2000-6000 μL / h; the internal phase ...
Example Embodiment
[0056] Example 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 silicon dioxide emulsion droplets: disperse tetraethyl orthosilicate and ammonia water in ethanol uniformly, stir at constant temperature for 6 hours; after the reaction is completed, silica nanoparticles are obtained by centrifugal purification. 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%; the microfluidic technology is used to use the aforementioned silica nanoparticle suspension as the dispersed phase. Under the shear force of the continuous phase simethicone, 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 used in the mi...
Example Embodiment
[0064] Example 2
[0065] In this embodiment, the preparation method of the inverse opal structure hydrogel photonic crystal microspheres includes the following steps:
[0066] (1) Preparation of silicon dioxide emulsion droplets: disperse tetraethyl orthosilicate and ammonia water evenly in ethanol and stir at constant temperature for 6 hours; after the reaction is completed, silica nanoparticles are obtained by centrifugal purification. The particles are dispersed in water to obtain a suspension; the particle size of the silica nanoparticles in the suspension is 245nm, and the mass concentration is 10%; the microfluidic technology is used to use the aforementioned silica nanoparticle suspension 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 capi...
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