Surface characterization of nanoparticles using near-field light scattering
| Autor: | Brian DiPaolo, Amber L. Doiron, Sebastian R Freeman, Bernardo Cordovez, Yizhong Liu, Eunsoo Yoo, Chukwuazam Nwasike |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
General Physics and Astronomy Nanoparticle 02 engineering and technology 010402 general chemistry lcsh:Chemical technology 01 natural sciences lcsh:Technology Light scattering Full Research Paper Zeta potential Nanotechnology General Materials Science lcsh:TP1-1185 Particle velocity nanoparticle surface properties Electrical and Electronic Engineering lcsh:Science nanophotonic force microscopy Scattering lcsh:T 021001 nanoscience & nanotechnology lcsh:QC1-999 0104 chemical sciences Surface coating Nanoscience Chemical physics near-field light scattering Particle superparamagnetic iron oxide lcsh:Q nanoparticles Particle size 0210 nano-technology lcsh:Physics |
| Zdroj: | Beilstein Journal of Nanotechnology Beilstein Journal of Nanotechnology, Vol 9, Iss 1, Pp 1228-1238 (2018) |
| ISSN: | 2190-4286 |
| Popis: | The effect of nanoparticle surface coating characteristics on colloidal stability in solution is a critical parameter in understanding the potential applications of nanoparticles, especially in biomedicine. Here we explored the modification of the surface of poly(ethylene glycol)-coated superparamagnetic iron oxide nanoparticles (PEG-SPIOs) with the synthetic pseudotannin polygallol via interpolymer complexation (IPC). Changes in particle size and zeta potential were indirectly assessed via differences between PEG-SPIOs and IPC-SPIOs in particle velocity and scattering intensity using near-field light scattering. The local scattering intensity is correlated with the distance between the particle and waveguide, which is affected by the size of the particle (coating thickness) as well as the interactions between the particle and waveguide (related to the zeta potential of the coating). Therefore, we report here the use of near-field light scattering using nanophotonic force microscopy (using a NanoTweezerTM instrument, Halo Labs) to determine the changes that occurred in hydrated particle characteristics, which is accompanied by an analytical model. Furthermore, we found that altering the salt concentration of the suspension solution affected the velocity of particles due to the change of dielectric constant and viscosity of the solution. These findings suggest that this technique is suitable for studying particle surface changes and perhaps can be used to dynamically study reaction kinetics at the particle surface. |
| Databáze: | OpenAIRE |
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