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. 2020 Apr 3;5(14):8403–8413. doi: 10.1021/acsomega.0c00271

Figure 1.

Figure 1

Water content decreases rapidly from 1 to 3.5 h due to evaporation; from 6 to 12 h, the water content remains stable, most likely from secondary interactions between the water, salts, and silica.