Sedimentation measurements with the analytical ultracentrifuge with absorption optics: influence of Mie scattering and absorption of the particles

Analytical ultracentrifugation is one of the most powerful methods for the characterization of nanoparticles since the days of its invention due to its high resolution and statistical significance. Latexes with different sizes and their mixtures have been measured by sedimentation with the analytica...

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Bibliographic Details
Published in:Colloid and polymer science 2011-07, Vol.289 (10), p.1145-1155
Main Authors: Lechner, M. D., Cölfen, Helmut, Mittal, Vikas, Völkel, Antje, Wohlleben, Wendel
Format: Article
Language:English
Subjects:
Applied sciences
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Exact sciences and technology
Food Science
Inventions
Mathematical analysis
Mie scattering
Nanoparticles
Nanotechnology and Microengineering
Organic polymers
Original Contribution
Particle size distribution
Physical Chemistry
Physicochemistry of polymers
Polymer Sciences
Properties and characterization
Samples
Sedimentation
Soft and Granular Matter
Statistical analysis
Surface properties
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Summary:Analytical ultracentrifugation is one of the most powerful methods for the characterization of nanoparticles since the days of its invention due to its high resolution and statistical significance. Latexes with different sizes and their mixtures have been measured by sedimentation with the analytical ultracentrifuge (AUC) OPTIMA XL-I (Beckman Coulter, Palo Alto, CA, USA) with interference optics at λ 0  = 675 nm and absorption optics at λ 0  = 546 and 263 nm. Additionally, a blue pigment with high absorption characteristic at visible light has been investigated. A large influence of Mie scattering and Mie absorption on the particle size distribution with respect to absorption optics and samples with moderate or broad size distribution is observed. Therefore, the consideration of the Mie scattering effect is compulsory for most AUC measurements of nanoparticles with absorption optics.
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-011-2440-x