Quantification of nanoparticle concentration in colloidal suspensions by a non-destructive optical method
| Autor: | Ewa M. Goldys, Heather J. Catchpoole, Sandhya Clement, Andrei V. Zvyagin, Åsa K. Jämting, Victoria A. Coleman, W. A. W. Razali, Jan Herrmann, Brint Gardner |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Particle number Mechanical Engineering Instrumentation Mie scattering Nanoparticle Bioengineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Nanomaterials Colloid Dynamic light scattering Mechanics of Materials Particle-size distribution General Materials Science Electrical and Electronic Engineering 0210 nano-technology Biological system |
| Zdroj: | Nanotechnology. 28(47) |
| ISSN: | 1361-6528 |
| Popis: | The estimation of nanoparticle number concentration in colloidal suspensions is a prerequisite in many procedures, and in particular in multi-stage, low-yield reactions. Here, we describe a rapid, non-destructive method based on optical extinction and dynamic light scattering (DLS), which combines measurements using common bench-top instrumentation with a numerical algorithm to calculate the particle size distribution (PSD) and concentration. These quantities were derived from Mie theory applied to measurements of the optical extinction spectrum of homogeneous, non-absorbing nanoparticles, and the relative PSD of a colloidal suspension. The work presents an approach to account for PSDs achieved by DLS which, due to the underlying model, may not be representative of the true sample PSD. The presented approach estimates the absolute particle number concentration of samples with mono-, bi-modal and broad size distributions with |
| Databáze: | OpenAIRE |
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