After the skin formation, coagulation can be assumed to be
mainly diffusion controlled (acid into the beads → neutralization;
saline water in and sodium hydroxide and urea out → dilution).
Slow diffusion and coagulation arranges cellulose molecules into
structures where specific surface area is maximized. When acid
concentration was high, higher concentration gradient increased
the diffusion rate and neutralization. This increased the kinetics
and caused faster agglomeration of cellulose