A kind of gas-solid-liquid three-phase gel, its preparation method and application
A technology of gas-solid-liquid and aerogel, which is applied in the direction of airgel preparation, gel preparation, chemical instruments and methods, etc., and can solve problems such as the inability to form a gel and the inability to form a gas-solid-liquid three-phase network
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[0061] Another aspect of the embodiments of the present invention also provides a method for preparing the aforementioned gas-solid-liquid three-phase gel, which includes:
[0062] Mix the hydrophobic airgel particles and the polymer hydrogel precursor evenly to form a mixed system;
[0063] A cross-linking agent and a catalyst are added into the mixed system, and a gas-solid-liquid three-phase gel is obtained after a chemical cross-linking gelation reaction.
[0064] As one of the more preferred embodiments, the preparation method of the gas-solid-liquid three-phase gel comprises the following steps:
[0065] (1) Add a certain amount of hydrophobic airgel particles to the polymer hydrogel precursor, and stir vigorously until they are uniformly dispersed;
[0066] (2) Add a certain amount of cross-linking agent and catalyst to the above solution, stir quickly and evenly, and finally let the gel stand to prepare a gas-solid-liquid three-phase gel.
[0067] In some embodiments...
Embodiment 1
[0091] (1) Preparation of polymer hydrogel precursor aqueous solution: get 10 grams of PVA (polyvinyl alcohol), add it to 100ml deionized water, stir at room temperature for more than 1 hour, make it fully swell, then raise the temperature to 90°C, and then stirred until the PVA was completely dissolved to obtain an aqueous PVA solution.
[0092] (2) Mixing of hydrophobic airgel particles and PVA solution: 10g superhydrophobic silica airgel particles are poured into the PVA aqueous solution, wherein, the mass ratio of the hydrophobic airgel particles to the polymer gel precursor is 10:100, stir vigorously until the dispersion is uniform, ultrasonic for 10 minutes, and then stir vigorously and uniformly to obtain a composite solution.
[0093] (3) Preparation of gas-solid-liquid three-phase gel: 1ml hydrochloric acid solution and 0.1g glutaraldehyde aqueous solution (5wt%) were added to the above composite solution, stirred vigorously for 10 minutes, followed by ultrasonication...
Embodiment 2
[0095] (1) Preparation of polymer hydrogel precursor aqueous solution: Take 5 grams of PVA, add it to 100ml deionized water, stir at room temperature for more than 1 hour to make it fully swell, then raise the temperature to 90°C, and stir again Dissolve completely to PVA, obtain PVA aqueous solution.
[0096] (2) Mixing of hydrophobic airgel particles and PVA solution: pour 10g of hydrophobic alumina airgel particles into the PVA aqueous solution, wherein the mass ratio of the hydrophobic airgel particles to the polymer gel precursor is 10 : 100, stir vigorously until the dispersion is uniform, ultrasonic for 10 minutes, and then stir vigorously and uniformly to obtain a composite solution.
[0097] (3) Preparation of gas-solid-liquid three-phase gel: 0.5ml of hydrochloric acid solution and 0.05g of glutaraldehyde aqueous solution (10wt%) were added to the above composite solution, vigorously stirred for 10 minutes, followed by ultrasonication for 10 minutes, and vacuum degas...
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