Preparation method of silicon oxide aerogel with grade gradient holes for efficient water evaporation
A silicon oxide airgel and water evaporation technology, applied in the field of nanomaterials, achieves low cost, excellent light and hot water evaporation performance, and meets the needs of water management
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[0029] A method for preparing silica airgel with graded gradient pores for efficient water evaporation, the following steps are used:
[0030] Step 1 Mix 2-5mol / L urea solution with 0.22-0.44mol / L cetyltrimethylammonium bromide solution evenly, and then add glacial acetic acid to make the pH of the solution reach 4.2-4.3 , to obtain a mixed solution A; the mixed solution A is heated and stirred for 2 to 4 hours until completely transparent, wherein the mass ratio of urea to cetyltrimethylammonium bromide is 3:4 to 15:4;
[0031] Step 2 Add tetraethyl orthosilicate to the mixed solution A obtained in step 1, and keep stirring for 20 to 40 minutes until it becomes translucent to obtain a mixed solution B, wherein the mass ratio of urea to orthosilicate is 6: 23.4~15:14;
[0032] Step 3: Pour the mixed solution B obtained in step 2 into a high-temperature-resistant plastic container and seal it tightly, and place the plastic container in an oven at 60-80°C for gelation for 20-30...
Embodiment 1
[0036] A method for preparing silica airgel with graded gradient pores for efficient water evaporation, the following steps are used:
[0037] Step 1 gets the urea of 3mol / L and the cetyltrimethylammonium bromide solution of 0.3mol / L and mixes, and then adds glacial acetic acid wherein and makes the pH value of solution be adjusted to 4.25, obtains mixed solution A; The mixed solution A was heated and stirred for 3h until completely transparent;
[0038] In step 2, add 22.8mL tetraethyl orthosilicate to the mixed solution A obtained in step 1, and continue to stir for 30 minutes until it becomes translucent to obtain mixed solution B;
[0039] Step 3: Pour the mixed solution B obtained in step 2 into a high-temperature-resistant plastic container and seal it tightly, and place the plastic container in an oven at 60°C for gelation for 24 hours;
[0040] Step 4 Pour 20ml of absolute ethanol into the container after step 3, and seal it tightly. After soaking at room temperatur...
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