dynamic light scattering (dls)
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Dynamic Light Scattering
Ardalan Hayati Far
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2014 رویرهش 18 هبنشراهچ
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2014 رویرهش 18 هبنشراهچ
Rayleigh Scattering
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Mie Scattering
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What is DLS?
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2014 رویرهش 18 هبنشراهچ
© 2011 HORIBA, Ltd. All rights reserved.
Particle Diameter ( m)0.01 0.1 1 10 100 1000
Colloidal
Suspensions and Slurries
DLS – SZ-100
Electron Microscope
Powders
Fine Coarse
Microscopy PSA300
Laser Diffraction – LA-950
Acoustic Spectroscopy – DT-1201 and DT-300(Zeta)
Electrozone Sensing
Disc-Centrifuge (CPS)
Light Obscuration
0.001
Macromolecules
Nano-Metric
Met
hods
Met
hods
App
sA
pps
Siz
esS
izes
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Particle Size
2014 رویرهش 18 هبنشراهچ
© 2011 HORIBA, Ltd. All rights reserved.
DLS signalRandom motion of particles leads to random fluctuations in signal (due to changing constructive/destructive interference of scattered light.
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2014 رویرهش 18 هبنشراهچ
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2014 رویرهش 18 هبنشراهچ
A Typical Speckle Pattern
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2014 رویرهش 18 هبنشراهچ
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!"#$%&'%()#*&#%Brownian Motion
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Stokes-Einstein Equation
D diffusion coefficient
k is the Boltzmann constant
T is the temperature
η is the viscosity of the solution
R the hydrodynamic radius of the particle
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The Core
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Molecular Weight
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Hydrodynamic Radius
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2014 رویرهش 18 هبنشراهچ
© 2011 HORIBA, Ltd. All rights reserved.
Hydrodynamic SizeThe instrument reports the size of sphere that moves (diffuses) like your particle.This size will include any stabilizers bound to the molecule (even if they are not seen by TEM).
SEM (above) and TEM (below) images for RM 8011
Technique Size nmAtomic Force Microscopy 8.5 ± 0.3
Scanning Electron Microscopy 9.9 ± 0.1
Transmission Electron Microscopy 8.9 ± 0.1
Dynamic Light Scattering 13.5 ± 0.1
Gold Colloids
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2014 رویرهش 18 هبنشراهچ
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Why DLS?
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