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. 2020 Dec 27;72:105453. doi: 10.1016/j.ultsonch.2020.105453

Fig. 4.

Fig. 4

Nitrogen content obtained by silent conditions for nitrocellulose synthesis. Experimental conditions: 1 g of microcrystalline cellulose, 25 mL of acid solution (13.6 mL of 18.4 mol L−1 H2SO4 + 9.2 mL of 14.4 mol L−1 HNO3 + 2.2 mL H2O), at 30 °C for 30 min.