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.
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[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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