Novel gas-sensitive airgel material and preparation method thereof
An airgel and gas-sensing technology, which is applied in the field of new gas-sensing airgel materials and its preparation, can solve the problems of poor gas selectivity, large specific surface area, small particle size, etc., and achieve the effect of improving sensitivity
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Embodiment 1
[0015] The first step immerses the cellulose cotton pulp in the combination water system, the combination water system is made up of 5wt% sodium hydroxide, 0.5wt% sodium zincate, 4wt% thiourea and water; The mixture composed of the water system is frozen to -5°C, and then stirred and thawed to obtain a cellulose hydrosol uniformly dispersed at the molecular level; the third step is to cast the above hydrosol into a film and immerse it in 16wt% sodium sulfate aqueous solution to make the sol- Gel transformation; the fourth step is to immerse the hydrogel in 20%, 45%, 70% and 100% tert-butanol in order to replace; the fifth step is to put the replaced gel material in -5℃ environment for pre-cooling 10min, then placed in liquid nitrogen for quick cooling for 15min, and finally vacuum-dried at -30°C and 5Pa.
[0016] The diameter of cellulose nanofiber in the prepared airgel is 20nm, the particle diameter of nano-zinc oxide is 40nm, the pore diameter is 30nm, and the permeability ...
Embodiment 2
[0018] The first step immerses the cellulose bamboo pulp in the combination water system, the combination water system is made up of 8wt% sodium hydroxide, 1.8wt% sodium zincate, 10wt% thiourea and water; The mixture composed of the water system is frozen to -15°C, and then stirred and thawed to obtain a cellulose hydrosol uniformly dispersed at the molecular level; the third step is to cast the above hydrosol into a film and immerse it in 20wt% sodium sulfate aqueous solution to make it sol- Gel transformation; the fourth step is to immerse the hydrogel in 25%, 50%, 75% and 100% tert-butanol in order to replace; the fifth step is to pre-cool the replaced gel material in a -10°C environment 15min, then placed in liquid nitrogen for quick cooling for 30min, and finally vacuum-dried at -40°C and 30Pa.
[0019] The diameter of the cellulose nanofiber in the prepared airgel is 35nm, the particle diameter of nano-zinc oxide is 70nm, the pore diameter is 50nm, and the permeability o...
Embodiment 3
[0021] The first step immerses the cellulose wood pulp in the combined water system, the combined water system is composed of 6wt% sodium hydroxide, 0.8wt% sodium zincate, 6wt% thiourea and water; the second step combines the aggregated cellulose with the combined water The mixture composed of the system is frozen to -7°C, and then stirred and thawed to obtain a cellulose hydrosol uniformly dispersed at the molecular level; the third step is to cast the above hydrosol into a film and immerse it in 17wt% sodium sulfate aqueous solution to make it sol-gel Gel transformation; the fourth step is to immerse the hydrogel in 22%, 48%, 72% and 100% tert-butanol in order to replace; the fifth step is to put the replaced gel material in -7℃ environment for 12min , and then placed in liquid nitrogen for rapid cooling for 20 minutes, and finally vacuum-dried at -35°C and 10 Pa.
[0022] The diameter of the cellulose nanofiber in the prepared airgel is 25nm, the particle diameter of the na...
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