Highly Concentrated Colloidal Dispersion of Decanoic Acid Self-assembled Monolayer-protected CeO2 Nanoparticles Dispersed to a Concentration of up to 77 wt % in an Organic Solvent

Self-assembled monolayers (SAMs) of decanoic acids were prepared on CeO2 nanoparticles (NPs). The dispersion of the NPs was improved by increasing the packing density of decanoic acid SAM on CeO2 NPs. According to our proposed criterion related to the SAM on NPs for stable dispersion in nonpolar liquids, the CeO2 NPs were dispersed up to 77 wt % and perfectly dispersed up to 50 wt % in cyclohexane.