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Magnetic field-induced self-assembly of conjugated block copolymers and nanoparticles at the air−water interface
- Title
- Magnetic field-induced self-assembly of conjugated block copolymers and nanoparticles at the air−water interface
- Authors
- Park S.-J.; Park M.; Kang S.; Nam C.; Narasimha K.; Lee W.B.
- Ewha Authors
- 박소정
- SCOPUS Author ID
- 박소정
- Issue Date
- 2022
- Journal Title
- ACS Applied Materials and Interfaces
- ISSN
- 1944-8244
- Citation
- ACS Applied Materials and Interfaces vol. 14, no. 6, pp. 8266 - 8273
- Keywords
- Conjugated block copolymers; Interface; Magnetic field; Magnetic nanoparticles; Nanoarray; Self-assembly
- Publisher
- American Chemical Society
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Here, we report the magnetic field-induced self-assembly of a conjugated block copolymer, poly(3-hexylthiopene)block-poly(ethylene glycol) (P3HT-b-PEG), and iron oxide nanoparticles (IONPs) at the air−water interface. Binary self-assembly of P3HT-b-PEG and IONPs at the interface results in nanoparticle-embedded P3HT-b-PEG nanowire arrays with a micrometer-scale domain size. Under the magnetic field, the field-induced magnetic interaction significantly improves the degree of order, generating long-range ordered, direction-controlled nanoarrays of P3HT-b-PEG and IONPs, where IONPs are aligned in the direction of the magnetic field over a sub-millimeter scale. The size of IONPs is an important factor for the formation of an ordered assembly structure at the nanometer scale, as it dictates the magnetic dipole interaction and the entropic interaction between nanoparticles and polymers. The consideration of magnetic dipole interactions suggests that the field-induced self-assembly occurs through the formation of intermediate magnetic subunits composed of short IONP strings along the semirigid P3HT nanowires, which can be aligned through the magnetic interactions, ultimately driving the long-range ordered self-assembly. This study demonstrates for the first time that the magnetic field-induced self-assembly can be used to generate macroscopically ordered polymer films with a nanometer-scale order in low fields. © 2022 American Chemical Society
- DOI
- 10.1021/acsami.1c22535
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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