An experimental and theoretical approach to investigate correlation between electromagnetic properties of doped ferrites & its interfacial reactivity with dopamine
| Autor: | Yi Guang Jerome Lim, Zhong Chen, Munezza Ata Khan, Farooq Ahmad Kiani, Mohammad Mujahid, Say Chye Joachim Loo |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Magnetic domain General Physics and Astronomy Nanoparticle 02 engineering and technology Surfaces and Interfaces General Chemistry Coercivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films chemistry.chemical_compound Magnetization Zinc ferrite Crystallography chemistry Magnetic nanoparticles 0210 nano-technology Bifunctional Superparamagnetism |
| Zdroj: | Applied Surface Science. 506:144945 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2019.144945 |
| Popis: | Magnetic nanoparticles have attained considerable attention in the field of biomedicine. It can acquire single magnetic domain when particle size is scaled down to few nanometers and exhibit high coercivity and magnetization. At diameter less than 30 nm it exhibits superparamagnetism which makes it an attractive candidate for biosensing, magnetic resonance imaging and targeted drug delivery applications. However colloidal instability limits its application. The use of bifunctional linkers not only stabilizes nanoparticles but also provides one-step synthesis system in which linker has an attachment site for magnetic nanoparticles and another site bearing COOH−/ NH 2 + which allows binding of functional proteins or drugs. In this study, we selected dopamine for functionalization of Magnetite, Cobalt and Zinc Ferrite nanoparticles to understand how introduction of bivalent cations affects the chemisorption properties. Changes in its interfacial reactivity towards dopamine were first determined theoretically and interacting species were identified through Fourier Transform Infra-red Spectroscopy/FTIR. Dopamine binds with Fe+2 at octahedral positions through its -OH group in bidentate bridging configuration while addition of Zn+2 shifts its reactivity towards amine groups. A correlation between interfacial reactivity & electromagnetic properties of doped Iron oxides determined using combinations of pseudopotential and relativistic treatment methods, has also been established. |
| Databáze: | OpenAIRE |
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