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Cellulose-I swells considerably in phosphoric acid, and converts to amorphous cellulose via a cellulose-II transition state. Controlled oxidation of cellulose-I to 6-carboxycellulose (6CC) using HNO3–H3PO4–NaNO2 oxidation system led to the selective production of 6CC's of varying carboxyl contents (1.7–22%) as well as various shapes and sizes (macro-sized fibrils of several micron length and/or spherical...
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