Aqueous two-phase extraction is instrumental for obtaining single-walled carbon nanotubes (SWNT) with uniform physical properties. This study reports that a nonionic amphiphilic poly(2-ethyloxazoline)-benzyl ether derivative (POBE-BzE) not only efficiently disperses SWNT in both water and p-xylene, but can also be utilized as a single-surfactant for partitioning SWNT in a water/p-xylene two-phase extraction in a diameter (dt) selective manner. While individual POBE-BzE/SWNT dispersions exhibit similar photoluminescence positions from the SWNT, dt-dependency occurs according to the solvent. Upon two-phase extraction, a dt SWNT >0.9 nm was mainly extracted to the p-xylene layer, and its partition coefficient was investigated by varying the phase transfer catalyst or sodium chloride amounts, where sodium chloride served as a better transfer agent. The dt selective behavior and its partition coefficient were rationalized by the tight and loose configurations of the BzE moiety in each medium. This novel amphiphilic polymeric surfactant and two-phase extraction may be useful for sorting SWNT and other nanomaterials according to their size.
|Journal||Journal of Molecular Liquids|
|Publication status||Published - 2022 Dec 1|
Bibliographical noteFunding Information:
This research was financially supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science, and Technology (NRF-2022R1A2C1006932 and NRF-2020R1A4A101773711).
© 2022 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Materials Chemistry