Decanoic acid self-assembled monolayer (SAM) in the quasi-crystalline state was prepared on the surface of the cubic ceria 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 ceria nanoparticles. It turned out that the quasi-crystalline 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 ceria 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.
Методом гидротермального синтеза в сверхкритических условиях получены самоорганизующиеся монослои декановой кислоты на наночастицах диоксида церия (6.5 ± 1.1 нм) кубической формы. Разработан метод очистки поверхностно-модифицированных наночастиц диоксида церия от избыточной декановой кислоты, позволяющий получать квазикристаллические самоорганизующиеся монослои. Проведено исседование полученных материалов в твердой фазе и в растворе методами ИК-спектроскопии, термического анализа, дифференциальной сканирующей калориметрии и ядерного магнитного резонанса.
fulltext-eng (Journal of Nanoparticle Research 12 (2010)
Русский
