## 1 Introduction  
Metal oxide nanoparticles possess different physicochemical properties in comparison to bulk materials, and the size of nanoparticles is responsible for the changes in their characteristics. Aluminum oxide, commonly called alumina, has tremendous applications in ceramics, medical products, and catalysis, to name a few [1; 2; 3; 4; 5; 6]. Despite the expanding number of applications for aluminum oxide, the physical arrangement and interactions of liquids at Al\({}_{2}\)O\({}_{3}\) surfaces remains poorly understood. Many experimental and theoretical studies have indicated the inherent complexity of interfacial interactions among certain liquid/Al\({}_{2}\)O\({}_{3}\) mixtures, and the immobilization of liquids on Al\({}_{2}\)O\({}_{3}\) surfaces may improve the applicability of these materials in industry [4; 5; 6]. Ionic liquids (ILs) are a subset of low-melting-point salts that are known for high ionic conductivities, low vapor pressures, and low flammability. This combination of properties has opened opportunities for ionic liquids to serve as alternatives for conventional volatile organic solvents [7; 8; 9; 10]. Although ILs offer advantages over conventional solvents, there is still relatively little information available on the structures of ILs in the bulk and along various interfaces [7; 9]. The most extensively studied ILs are 1-alkyl-3-methylimidazolium salts, which feature asymmetric cations [7; 8; 9; 10]. The imidazolium ions are usually paired with anions that have highly delocalizedcharges or are intrinsically bulky. The liquid structures of 1-alkyl-3-methylimidazolium salts are strongly affected by the long-range charge organization of the constituent ions and may be described in terms of an extended quasi-lattice, in which ions are viewed as occupying sites in a disorganized crystalline lattice [11; 12]. In this model, any particular ion may be viewed as being trapped within a \"cage\" that is defined by its nearest neighbors. For ILs, the immediate solvation shell of an ion is most likely to be populated with counterions. Thus, an ion will have frequent opportunities to form short-lived associated species (e.g., ionic pairs, clusters, or aggregates) with the ions composing its cage [7; 13]. With three hydrogen atoms bound to the imidazolium ring, the most acidic proton (C\({}^{2}\)-H) may form cation/anion hydrogen bonds. The nonpolar alkyl side chain of the cation provides another source of mesoscopic self-assembly of imidazolium ILs into nanostructured polar/nonpolar domains. Such nano-segregation is frequently observed in small angle X-ray scattering experiments for alkyl side chains containing four or more carbon atoms [14]. Various studies demonstrate significant heterogeneities in certain ionic liquid dynamics, and much of the heterogeneity may arise from nano-structured associations with polar and nonpolar regions [7; 8; 9; 10; 13; 14]. Microscopic structures of certain ILs at solid surfaces have received considerable attention in recent years [7; 9; 13]. Nevertheless, the interfacial interactions caused by ionic liquid adsorption on the surface of Al\({}_{2}\)O\({}_{3}\) are complex and depend on the molecular structures of ILs. It has been suggested that Coulombic forces, hydrogen bonding, and \(\pi\) interactions may each play significant roles in defining the molecular ordering of ILs along the surface [7; 9]. In this study, 1-butyl-3-methylimidazolium trifluormethanesulfonate [BMI][TFS] and nano-Al\({}_{2}\)O\({}_{3}\) were chosen as a model IL and solid support, respectively. As pointed out by [PERSON] et al. [4], the TFS anion has many strong bands in the infrared spectrum. Unlike the bis(trifluoromethylsulfonyl)amide (NTT\({}_{2}\)\({}^{-}\)) anion, the TFS anion has only one conformer, which simplifies the spectral analysis. Nano-Al\({}_{2}\)O\({}_{3}\) was chosen in this study mainly due to the wide application of nano-Al\({}_{2}\)O\({}_{3}\), particularly in the field of catalysis.