The 5 wt% of C18GL (5), which exhibited the highest gelation ability as shown in Table , was used to examine the gelation ability in various oils (Figure ). and diisostearyl malate (g) formed soft gels. Rice bran oil (e) was too soft to gel. 2-Ethylhexyl palmitate (f) also formed an incomplete gel with liquid separation. Alcohols (h and i) and silicone oils (j and k) could gel. The FE-SEM study showed that C18GL (5) forms plate-like crystals building up to a porous structure. In contrast, C16AG (8) forms fiber structures. The inverted microscopy images showed fibers for C16AG (8), whereas C18GL (5) showed a mass of crystals (Figure ). In addition, in 2-ethylhexyl palmitate, these crystalline masses gathered radially to form domains. We suggested that C16AG (8) gels by trapping oil between fibers, while C18GL (5) gels by trapping oil in a porous mass. This idea correlates well with the FE-SEM observations. In the mechanism of trapping oil between fibers, oil can be gelled with a small amount of gelator, while in the mechanism of trapping oil in a porous mass, oil cannot be gelled without increasing the concentration of gelator.