The time for carbon aerogel to
reach one-half of the saturated sorption capacity,
denoted as th, was used to characterize the absorption
rate. The th value for diesel absorption (th = 0.6 s) was
the smallest among the four different oils, indicating a
very fast absorption rate. Because oil density and
viscosity play important roles in the absorption capacity
of carbon aerogel, the normalized oil absorption capacity
of carbon aerogel for paraffin oil ranks the highest
among the four kinds of oils