The self-assembling properties of glycerol esters in water are well known. Still, few data on glycerol Morioesters of undecylenic acid are available. The aim of this study was to highlight the behavior of glycerol monoundecenoate (GM-C11:1) in different diluted and concentrated states. Its self assembling properties in water and upon solid inorganic surfaces were investigated in the diluted state-using surface-tension experiments, atomic force microscopy, and-cryogenic trans mission electron microscopy studies. In the concentrated-state, the gelling properties in the presence of water were investigated using polarized light microscopy; differential scanning calorimetry,(DSC), and small-angle X-ray scattering (SACS) experiments. GM-C11:1 at 100 mg/L self-assembles at the interfaces as aggregates of approximately 20 nm in diameter, organized into concentric forms. These aggregates are spherical globules composed of several molecules of GM-C11:1. At higher concentrations-(1000 and 104 mg/L), GM-C11:1 is able to-uniformly coat liquid/air and liquid/solid interfaces. In bulk, GM-C11:1 forms spontaneously aggregates and vesicles. In a More concentrated state, GM-C11:1 assembles into:lamellar L-beta and L-alpha forms in water. By cross-referencing SAXS and DSC findings, we were able to distin-guish between interlamellar water molecules strongly bound to GM-C11:1 and other molecules remaining unbound and considered to be "mobile" water. The percentage of water strongly bound was proportional to the percentage of GM-C11:1 in the-system. In this case, GM-C11:1 appears to be an effective molecule for surface treatments for which water retention is important.