Gated and near-surface diffusion of charged fullerenes in nanochannels
| Autor: | Mauro Ferrari, Delia Danila, Yuri Mackeyev, Daniel Fine, Fazle Hussain, Jaskaran Gill, Matthew A. Cheney, Arturas Ziemys, Alessandro Grattoni, Sharath Hosali, Lon J. Wilson, Erika Zabre |
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| Rok vydání: | 2011 |
| Předmět: |
Surface diffusion
Models Molecular Materials science Fullerene Silicon Diffusion Static Electricity General Engineering General Physics and Astronomy Ionic bonding Nanoparticle chemistry.chemical_element Nanotechnology Electrostatics Nanostructures chemistry Models Chemical Ionic strength Materials Testing General Materials Science Computer Simulation Fullerenes Porosity |
| Zdroj: | ACS nano. 5(12) |
| ISSN: | 1936-086X |
| Popis: | Nanoparticles and their derivatives have engendered significant recent interest. Despite considerable advances in nanofluidic physics, control over nanoparticle diffusive transport, requisite for a host of innovative applications, has yet to be demonstrated. In this study, we performed diffusion experiments for negatively and positively charged fullerene derivatives (dendritic fullerene-1, DF-1, and amino fullerene, AC60) in 5.7 and 13 nm silicon nanochannels in solutions with different ionic strengths. With DF-1, we demonstrated a gated diffusion whereby precise and reproducible control of the dynamics of the release profile was achieved by tuning the gradient of the ionic strength within the nanochannels. With AC60, we observed a near-surface diffusive transport that produced release rates that were independent of the size of the nanochannels within the range of our experiments. Finally, through theoretical analysis we were able to elucidate the relative importance of physical nanoconfinement, electrostatic interactions, and ionic strength heterogeneity with respect to these gated and near-surface diffusive transport phenomena. These results are significant for multiple applications, including the controlled administration of targeted nanovectors for therapeutics. |
| Databáze: | OpenAIRE |
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