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Nano Research & Applications
ISSN 2471-9838
Advanced Nano 2017
Page 66
September 11-12, 2017 Amsterdam, Netherlands
20
th
International Conference on
Advanced Nanotechnology
Multi polarization dynamic light scattering of
non-spherical nanoparticles in solution
Alexander D Levin
1
, Ekaterina A Shmytkova
1
and
Boris N Khlebtsov
1, 2
1
All-Russian Research Institute for Optical and Physical Measurements,
Russia
2
Institute of Biochemistry and Physiology of Plants and Microorganisms
- RAS, Russia
A
pplication of dynamic light scattering (DLS) for sizing
of non-spherical nanoparticles using co polarized
and cross-polarized components of the scattered light
is limited by the difficulties of measurement of very
weak cross-polarized light intensity and problems with
inverting of the scattering data into direct prediction of
nanoparticles size parameters. Here we propose the new
technique, called multi polarization DLS, based on time-
resolved measurements of the scattered light intensity
at different angles between the incident and scattered
light polarizations. The physical model giving the relation
between particle’s translational and rotational diffusion
coefficients and intensity autocorrelation function (ACF)
for the arbitrary angle between the incident and scattered
polarizations is developed. Numerical algorithm for the
inverse problem of calculating the diffusion coefficients
from the family of ACFs is introduced, and a semi empirical
approach for length and diameter estimation of quasi-
cylindrical nanoparticles from the diffusion coefficients is
proposed. The application to Au and Fe2O3 Nano rods,
in particular to monitor the selective etching-induced size
changing, is described. In comparison with depolarized
DLS, the method allows one to avoid measurement of the
very weak cross-polarized component of the scattered
light, and gives more data for solving the inverse problem
of size parameter reconstruction from the scattered light
intensity.
levin-ad@vniiofi.ruNano Research & Applications