Figure 14.

(a) (Left) Cellulose beads prepared from a 5% cellulose–7% NaOH–12% urea–water solution and coagulated in nitric acid and (right) oxidized with Anelli’s reaction at 60 °C for 48 h. (Middle) Beads after drying at room temperature. (b) Total anionic groups in CBs oxidized for 2–48 h at 20–80 °C. Reprinted from ref (90) with permission from Springer Nature.