As shown in Fig. 1, there is a distinct increase in the
foaming capacity (the ratio of foam volume to slurry volume)
from 1.68 to 2.93 with the increase of the valeric acid
concentration. When the concentration of valeric acid was less
than 30 mmol/L, the number of amphiphilic molecules was not
enough to adsorb to ceramic particles, which degraded directly
the hydrophobicity of colloidal particles and led to a relatively
low foaming capacity of the suspension. With increasing the