Zinc oxide/zinc hydroxide aerogel and preparation method thereof
A zinc hydroxide and zinc oxide technology, applied in aerogel preparation, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of difficult production complexity and achieve low density, simple equipment, and large specific surface area. Effect
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Embodiment 1
[0032] 1) Preparation of zinc oxide / zinc hydroxide nanosheets:
[0033] Add 1mL of 200mM sodium lauryl sulfate solution, 4mL of 100mM hexamethylenetetramine solution, and 4mL of 100mM zinc nitrate solution into 91mL of deionized water and add 10mg of NaOH solid to adjust the pH value of the solution, mix well and place React at a temperature of 90° C. for 2 hours, fully stir during the period, and the stirring speed is 200 rpm, and finally obtain a suspension rich in zinc oxide / zinc hydroxide nanosheets. Take it out and let it cool at room temperature, centrifuge the suspension at 3000rpm, take out the precipitate and wash it repeatedly with deionized water for 5 times, and finally disperse it in 10mL of deionized water, let stand and remove the supernatant, leaving 5mL Flocculent ZnO / ZnOH Nanosheet Dispersion. Put the dispersion in a 5mL beaker and freeze it in a -20°C refrigerator for 12h, then put it in a vacuum freeze dryer and dry it at -50°C for 24h to obtain a volume o...
Embodiment 2
[0039] As in the steps of Example 1, 4 mL of 300 mM sodium lauryl sulfate solution, 8 mL of 200 mM hexamethylenetetramine solution, and 8 mL of 200 mM zinc nitrate solution were added to 80 mL of deionized water, and then 20 mg of hydroxide Sodium solids are used to adjust the pH to obtain zinc oxide / zinc hydroxide nanosheet precipitation with a mass of about 40 mg. Further adopt the same method to prepare zinc oxide / zinc hydroxide airgel, the prepared zinc oxide / zinc hydroxide airgel is cylindrical, and the volume is 4.8cm 3 , the density is 7.7mg / cm 3 .
[0040] attached Figure 5 These are scanning electron micrographs and optical photographs (inset) of the zinc oxide / zinc hydroxide airgel obtained in this example. As shown in the figure, the three-dimensional porous structure is displayed in a large range. The pore wall is formed by coiled zinc oxide / zinc hydroxide nanosheets, and the thickness of the sheet is below 0.1 μm.
Embodiment 3
[0042] As in the steps of Example 1, potassium lauryl sulfate was used; further, the same method was used to prepare zinc oxide / zinc hydroxide airgel. The prepared zinc oxide / zinc hydroxide airgel is cylindrical with a volume of 3.0 cm 3 , with a mass of 19.5mg and a density of 6.5mg / cm 3 .
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