The width of the recycled cellulose fibers is much larger than that of nanocellulose fibers (2–100 nm) [29,40–42],
but consistent with data for recycled cellulose fibers in the literature [43–45].
From Fig. 2c, it can be observed that pore size of the aerogel is in the range of 40–200 m,
indicating the macroporous property of the material.
The sample has a density of 0.040 g cm−3calculated from the weight and volume of the aerogel (Table 1).