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Magnetic Switch of Permeability for Polyelectrolyte Microcapsules Embedded with Co@Au Nanoparticles
Abstract
We explored using a magnetic field to modulate the permeability of polyelectrolyte microcapsules prepared by layer-by-layer self-assembly. Ferromagnetic gold-coated cobalt (Co@Au) nanoparticles (3 nm diameter) were embedded inside the capsule walls. The final 5 mum diameter microcapsules had wall structures consisting of 4 bilayers of poly(sodium styrene sulfonate)/poly(allylamine hydrochloride) (PSS/PAH), 1 layer of Co@Au, and 5 bilayers of PSS/PAH. External alternating magnetic fields of 100-300 Hz and 1200 Oe were applied to rotate the embedded Co@Au nanoparticles, which subsequently disturbed and distorted the capsule wall and drastically increased its permeability to macromolecules like FITC-labeled dextran. The capsule permeability change was estimated by taking the capsule interior and exterior fluorescent intensity ratio using confocal laser scanning microscopy. Capsules with 1 layer of Co@Au nanoparticles and 10 polyelectrolyte bilayers are optimal for magnetically controlling permeability. A theoretical explanation was proposed for the permeability control mechanisms. "Switching on" of these microcapsules using a magnetic field makes this method a good candidate for controlled drug delivery in biomedical applications.
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Cited by
Magnetic fluid hyperthermia: focus on superparamagnetic iron oxide nanoparticles
Laurent, S., Dutz, S., Häfeli, U. O., & Mahmoudi, M. (2011) · Advances in Colloid and Interface Science · doi:10.1016/j.cis.2011.04.003 · Cited by 1,326
Motornov, M., Roiter, Y., Tokarev, I., & Minko, S. (2010) · Progress in Polymer Science · doi:10.1016/j.progpolymsci.2009.10.004 · Cited by 773
Release mechanisms for polyelectrolyte capsules
De Geest, B. G., Sanders, N. N., Sukhorukov, G. B., Demeester, J., & De Smedt, S. C. (2007) · Chem. Soc. Rev. · doi:10.1039/b600460c · Cited by 462
The Future of Layer-by-Layer Assembly: A Tribute to ACS Nano Associate Editor Helmuth Möhwald
Zhao, S., Caruso, F., Dähne, L., Decher, G., De Geest, B. G., Fan, J., Feliu, N., Gogotsi, Y., Hammond, P. T., Hersam, M. C., et al. (2019) · ACS Nano · doi:10.1021/acsnano.9b03326 · Cited by 283
Magnetoliposomes for controlled drug release in the presence of low-frequency magnetic field
Nappini, S., Bombelli, F. B., Bonini, M., Nordèn, B., & Baglioni, P. (2010) · Soft Matter · doi:10.1039/b915651h · Cited by 113
Metadata
- Authors
- Lu, Z., Prouty, M. D., Guo, Z., Golub, V. O., Kumar, C. S. S. R., & Lvov, Y. M.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2005-01-26
- Volume
- 21
- Issue
- 5
- Pages
- 2042-2050
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2050894465
- Cited by
- 352
- References
- 0
- FWCI
- 9.30
- Type
- journal article
- Language
- en
- Open access
- closed
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- Lu, Z., Prouty, M. D., Guo, Z., Golub, V. O., Kumar, C. S. S. R., & Lvov, Y. M. (2005). Magnetic Switch of Permeability for Polyelectrolyte Microcapsules Embedded with Co@Au Nanoparticles. Langmuir. https://doi.org/10.1021/la047629q
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