Synthesis and characterization of a fatty acid self-assembled monolayer on CeO2 nanoparticles: To explore solution-state property of a SAM

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Decanoic acid self-assembled monolayer (SAM) in the quasi-crystalline state was prepared on the surface of the cubic CeO2 nanoparticles (6.5 ± 1.1 nm) by hydrothermal synthesis. The purification method to obtain quasi-crystalline SAM without residual (free) decanoic acid was developed. The SAM was carefully washed (purified) and characterized carefully by FT-IR, TG, DSC, and NMR. The obtained results showed that good agreement with the property of the dry state SAM. The solution state properties of the SAM were also examined by the CeO2 nanoparticles. It turned out that the quasicrystalline SAM could be swollen by its good solvents, cyclohexane, and chloroform; however, the quasi-crystalline SAM showed that a size exclusion effect to the solvent, trans-decalin. In addition, it turned out that the molecular motion of the decanoic acids in the SAM was highly restricted even in the swollen state depending on the distance from the grafting point to the CeO2 surface. The strong osmosis was also observed. The solvent molecules were not easily released from the SAM even after the solvent molecules outside of the SAM were frozen.

Original languageEnglish
Pages (from-to)2567-2578
Number of pages12
JournalJournal of Nanoparticle Research
Issue number7
Publication statusPublished - 2010 Sep


  • Nanoparticle
  • Polymer brush
  • Self-assembled monolayer
  • Supercritical fluids
  • Surface chemistry
  • Thin films

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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