Surface modification of metal oxide nanoparticles by organic ligands in supercritical methanol
- Surface modification of metal oxide nanoparticles by organic ligands in supercritical methanol
- Bambang Veriansyah; 김재훈; 이윤우; 김재덕
- supercritical fluid; nanoparticles
- Issue Date
- Supercritical methanol provides an excellent reaction medium for continuous synthesis of surface-modified nanoparticles because homogeneous metal salt solution and organic surface modifier solution can be introduced into a flow type reactor continuously, and line and filter clogging problems by unreacted, precipitated surface modifier in water at ambient condition can be avoided. In this work, continuous, one-pot syntheses of organic modification of zinc oxide and ceria oxide nanoparticles in supercritical methanol were examined using oleic acid and decanoic acid as organic modifiers. The usage of supercritical methanol and the addition of the organic modifiers into the reaction system have a significant effect on the particle size, morphology and the dispersion of nanoparticles. Fourier transform infrared (FT-IR) and thermogravimetric analysis (TGA) indicated that aliphatic, carboxylate and hydroxyl groups were chemically bounded on the surface of metal oxide nanoparticles. The surface modified nanoparticles showed a very high surface area compared with unmodified particles. Transmission electron microscopy (TEM) images showed that the organic modification inhibited crystal growth of the nanoparticles.
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