| Summary: | Surface modification is one of several techniques on improving the characteristic of certain elements. The surface of material can be modified by coating it with certain coating material. In this study Aluminium Oxide (Al<sub>2</sub>O<sub>3</sub>) nanoparticles (NPs) is used and its coating material are Oleic Acid and Silica Dioxide. The main objectives of this study are to observe the properties of Al<sub>2</sub>O<sub>3</sub> NPs after being coated with OA and SiO<sub>2</sub> at paraffin oil and brine water interface and to investigate the changes of NPs structure and chemical properties using three analysis which are Scanning Electron Microscope (SEM), Fourier Transform Infrared (FTIR) and X-Ray Powder Diffraction (XRD). Al<sub>2</sub>O<sub>3</sub> NPs was coated with OA and then followed by SiO<sub>2</sub> coating. After that, the modified NPs was analyzed by these analysis (SEM, FTIR and XRD). The modified Al<sub>2</sub>O<sub>3</sub> NPs then were injected into mixture of paraffin oil and brine water. Al<sub>2</sub>O<sub>3</sub> NPs coated with OA inhibit hydrophobic tails which prevent the molecules of NPs to mix with water. While for NPs coated with SiO<sub>2</sub>, its aggregate well at the interface and most of it sticking to test tube wall. However, some of the NPs dissolve in water. SEM analysis images of before and after coating show different in thickness indicate the successfulness in coating. OA and SiO<sub>2</sub> can be seen attach to Al<sub>2</sub>O<sub>3</sub> NPs quasi-spherical surface. While FTIR and XRD peaks show that there are changes in chemical properties and existence of contaminant at Al<sub>2</sub>O<sub>3</sub> NPs crystallite structure. These analysis and observation of NPs confirming the successful of coating. Thus, can help in detection of crude oil production and improve the performance of Al<sub>2</sub>O<sub>3</sub> NPs.
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