TY - JOUR
T1 - Synthesis and characterization of a fatty acid self-assembled monolayer on CeO2 nanoparticles
T2 - To explore solution-state property of a SAM
AU - Arita, Toshihiko
AU - Yoo, Jungwoo
AU - Adschiri, Tadafumi
N1 - Funding Information:
Acknowledgments This study was supported by a Scientific Research Grant from the Ministry of Education, Science, Sports, and Culture of Japan. This research was also partly supported by New Energy and Industrial Technology Development Organization Japan (NEDO). The author (T. Arita) thanks Grant-in-Aid for Young Scientists (B) No. 19750094 for their financial support. The Authors also thank Prof. K. Kanie and Prof. A. Muramatsu (IMRAM, Tohoku University) to allow us to use their DSC.
PY - 2010/9
Y1 - 2010/9
N2 - 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.
AB - 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.
KW - Nanoparticle
KW - Polymer brush
KW - Self-assembled monolayer
KW - Supercritical fluids
KW - Surface chemistry
KW - Thin films
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U2 - 10.1007/s11051-009-9826-4
DO - 10.1007/s11051-009-9826-4
M3 - Article
AN - SCOPUS:77955373239
SN - 1388-0764
VL - 12
SP - 2567
EP - 2578
JO - Journal of Nanoparticle Research
JF - Journal of Nanoparticle Research
IS - 7
ER -