Nanopartikel Größenmessung leicht gemacht! - Colloid Metrix€¦ · D 50 = 462 nm D 50 = 299 nm ....
Transcript of Nanopartikel Größenmessung leicht gemacht! - Colloid Metrix€¦ · D 50 = 462 nm D 50 = 299 nm ....
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Nanopartikel Größenmessung
leicht gemacht!
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Content • Basics
– General basics
– Measurement basics
• Applications
– Strengths and limits off DLS
– Measurement examples
– Online measurement
– Concentration and molecular weight measurement
• Different setups of the systems
– Online, Cuvettes
• Combination with Stabino®
• Summary
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Nanoparticles
gold nanoparticle in water
size: 5 – 10 nm
Bulkphase of gold
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What are Colloids?
• Macromolecules in solution
– < 1nm – 10 nm
• Particles dispersed in liquids
– < 1 nm – 10 µm
• > 20 nm turbid
clear
turbid > 20 nm
1 nm
100 nm
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Colloids
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Methods of Light Scattering (LS)
Q
I
t
I
%
size/µm
Static LS Dynamic LS
10nm – 2mm 0.8nm – 6,5µm
FFT Mie
Q
Static LS (SLS):
The information on
size is in the angle
function
Dynamic LS (DLS)
The information on
size is in the
fluctuation of the
scattering signal
(Brownian motion)
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DLS - Stokes-Einstein-relation
• To calculate particle size:
• 𝑟 =R·𝑇
𝑫·6π·𝜂·NA
• r = particle radius; D = diffusion coefficient; R = gas constant; NA =
Avogadro‘s constant; = viscosity of continuous phase and T =
temperature
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Laser
Scattered light
from particles
Detector
Laser in &
reflected laser
Scattered &
reflected
light
Size & concentration
0.01 – 40 vol%
Homodyne Heterodyne
K: colloid D: detector O: imaging optics R: partial reflecting surface
180° heterodyne back scattering (DLS)
highest possible concentration
from transparent to carbon black
No multiple scattering
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Signal at the detector
Log intensity
time Noise
homodyne
heterodyne
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180° heterodyne back scattering (DLS)
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• size 0.8 nm (0,3 nm) – 6.5 µm (10 µm)
• Concentration up to 40 vol.%
• Minimum sample volume 10 µL
• Molecular weight by Debye Plot dn/dc
• Online or inline Measurements are possible
• Cuvettes
• Zeta potential option with Stabino® / ZETA-
Check
Specifications
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Applications
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Different ways of measurement
drop in nearly every vessel online with Stabino®
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NANO-flex® Applications
• protein
• drinks
• lysozyme
• liposome
• humic acid
• fullerene
• diamond
• CNTs
• quantum Dots
• emulsion
• metal oxide
• polymer dispersions
• printing ink
• coatings
• and much more
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3790 nm
711 nm
83.9 nm
Dia / nm
measured
Vol %
measured
Dia /nm
theoretical
Vol %
theoretical
83.9 11.7 % 95.6 33.74 %
711 76.8 % 746 63.22 %
3790 11.5 % 4760 3.04 %
Application: three modal latex beads mixture
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Application: high resolution and differentiation
100 nm
200 nm
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5 drops 20 nm PS in 1 mL water 5 drops 20 nm PS in 1 mL water + 1 drop 100 nm PS
20 drops 20 nm PS in 1 mL water + 1 drop 100 nm PS
Application: different concentrations in a mix
25 drops 20 nm PS in 1 mL water + 1 drop 100 nm PS
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Application: different concentrations in a mix
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Application: ink
white ink
cyan ink
white and cyan ink in original concentrations
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Application: ceramics
50 w% ceramic slurry with a liquid agent at pH 9
50 w% ceramic slurry with a liquid agent at pH 1
D 50 = 462 nm
D 50 = 299 nm
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Application: Filtration control
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Application: Gushing inducing particles
Haffmans ISD INPACK 200
SAMPLING DEVICE
red: gushing; green: tendency to gushing; blue: no gushing
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Application: chitosan
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Application: ONLINE in-situ size measurement
Time / min
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Application: size & concentration
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Application: molecular weight measurement
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NANO-flex® Online
Variable probe length
Up to 3.5m flexible tube
Pressure measurement
cell
Remote control of
Software
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Combination of Stabino® & NANO-flex®
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Combination of Stabino® & NANO-flex®
Remote controlled form
Stabino® Software
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Application (pH): Al2O3 with size measurement
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Summary
High concentration
High dynamic range AND high resolution
Organic and aqueous solutions
Online Measurement
Remote Control
Presentation of sample in any vessel including cuvettes and drops
Combination with Stabino® for particle charge measurement and
titrations
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Summary
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MANY THANKS
FOR
YOUR ATTENTION