Flow Dichroism as a Reliable Method to Measure the Hydrodynamic Aspect Ratio of Gold Nanoparticles
| Autor: | Jan Vermant, Naveen Krishna Reddy, Jorge Pérez-Juste, Luis M. Liz-Marzán, Isabel Pastoriza-Santos, Jan K. G. Dhont, Peter R. Lang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Optics and Photonics
Light rotational diffusion methods [Microscopy Electron Transmission] Dispersity Metal Nanoparticles Physics::Optics General Physics and Astronomy Nanoparticle 02 engineering and technology 01 natural sciences Light scattering Flow Dichroism chemistry [Metal Nanoparticles] Nanotechnology Scattering Radiation General Materials Science metal nanoparticles approximation jeffery orbits General Engineering dynamic light-scattering 021001 nanoscience & nanotechnology optical-properties conservative dichroism Colloidal gold Chemical physics ddc:540 ddc:500 gold decahedron Rheology 0210 nano-technology methods [Microscopy Electron] Materials science chemistry [Gold] brownian motion Transmission electron microscope anisotropy 010402 general chemistry Microscopy Electron Transmission Dynamic light scattering transmission electron microscopy Gold nanoparticles suspensions Particle Size particles Models Statistical Nanocomposite gold rod methods [Nanotechnology] 0104 chemical sciences Microscopy Electron Hydrodynamics depolarized dynamic light scattering Nanoparticles Particle Gold nanorods methods [Rheology] |
| Zdroj: | ACS Nano ACS nano 5, 4935-4944 (2011). doi:10.1021/nn201033x ACS Nano, 2011, 5 (6), 4935 – 4944 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/nn201033x |
| Popis: | Particle shape plays an important role in controlling the optical, magnetic, and mechanical properties of nanoparticle suspensions as well as nanocomposites. However, characterizing the size, shape, and the associated polydispersity of nanoparticles is not straightforward. Electron microscopy provides an accurate measurement of the geometric properties, but sample preparation can be laborious, and to obtain statistically relevant data many particles need to be analyzed separately. Moreover, when the particles are suspended in a fluid, it is important to measure their hydrodynamic properties, as they determine aspects such as diffusion and the rheological behavior of suspensions. Methods that evaluate the dynamics of nanoparticles such as light scattering and rheo-optical methods accurately provide these hydrodynamic properties, but do necessitate a sufficient optical response. In the present work, three different methods for characterizing nonspherical gold nanoparticles are critically compared, especially taking into account the complex optical response of these particles. The different methods are evaluated In terms of their versatility to asses size, shape, and polydispersity. Among these, the rheo-optical technique Is show to be the most reliable method to obtain hydrodynamic aspect ratio and polydispersity for nonspherical gold nanoparticles for two reasons. First, the use of the evolution of the orientation angle makes effects of polydispersity less important. Second, the use of an external flow field gives a mathematically more robust relation between particle motion and aspect ratio, especially for particles with relatively small aspect ratios. ispartof: ACS Nano vol:5 issue:6 pages:4935-4944 ispartof: location:United States status: published |
| Databáze: | OpenAIRE |
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