In this work, a study on the synthesis, modification and characterization of oleic acid-functionalized hematite nanoparticles are presented. One step hydrothermal method is used to synthesize the uniform polyhedronal hematite nanoparticles with diameter 80-100 nm (confirmed by XRD, HRTEM and Raman spectroscopy) and oleic acid is used as surface chemistry modifier. Based on the result, it is shown that oleic acid can be used to modify the surface chemistry of the particle and improve its oil wettability. FTIR spectra showed that the binding mechanism between hematite nanoparticle surface and the oleic acid is believed to occur by forming monodentate interaction between COO- group of oleic acid and iron atom which only occur in the surface of hematite nanoparticle without disrupting its crystalline structure (confirmed by XRD analysis). This is proven by calculated wave number separation (??) between asymmetric ?as(COO-) and symmetric ?s(COO-) peaks after modification which associated to the corresponding interaction. In addition, the modification is also found to be increasing the contact angle of the thin film of hematite nanoparticle significantly from 26.05o to 141o making the particle to strongly have hydrophobic properties.

Synthesis, modification, and characterization of oleic acid functionalized hematite nanoparticles

247th National Meeting (2014)

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