HIGH RESOLUTION ULTRASOUND SPECTROSCOPY IN HUMIC RESEARCH Miloslav Pekař Jiří Kučerík Daniela...
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Transcript of HIGH RESOLUTION ULTRASOUND SPECTROSCOPY IN HUMIC RESEARCH Miloslav Pekař Jiří Kučerík Daniela...
![Page 1: HIGH RESOLUTION ULTRASOUND SPECTROSCOPY IN HUMIC RESEARCH Miloslav Pekař Jiří Kučerík Daniela Šmejkalová Martina Klučáková Institute of Physical and Applied.](https://reader035.fdocuments.net/reader035/viewer/2022081513/56649d135503460f949e7e13/html5/thumbnails/1.jpg)
HIGH RESOLUTION ULTRASOUND SPECTROSCOPY IN HUMIC RESEARCH
Miloslav Pekař Jiří Kučerík
Daniela Šmejkalová Martina Klučáková
Institute of Physical and Applied Chemistry
Faculty of Chemistry
Brno University of Technology
Brno, Czech Republic
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? • ULTRASOUND SPECTROSCOPY • ?
TRADITIONAL SPECTROSCOPY
sample
electromagnetic wave
ULTRASOUND SPECTROSCOPY
ultrasound wave(mechanical)
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ULTRASOUND INTERACTION WITH MATTER
intermolecular forces probe
microelasticity
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ULTRASOUND FREQUENCY
method Hz
UV 1014-1016
VIS 1014
IR 1012-1014
NMR 106-108
US 106-108
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ULTRASOUND PARAMETERS
• velocity ...
• amplitude (attenuation) ......
... elasticity, density •
...... energy loss •
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ULTRASOUND VELOCITY
elastic response• dominating • sensitive to molecular organization, intermolecular interactions
v
solids
liquids
gasesrigidity . . . velocity
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ULTRASOUND ATTENUATION
heterogeneous sample• scattering • particle sizing
homogeneous sample • local relaxation
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HIGH RESOLUTION
RESOLUTIONhighnormal
ATTENUATION
VELOCITYVELOCITY
0.1 m/s 0.0001 m/s
(10-5%)
0.2% 0.2%
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EXAMPLE – MICELLES
hydrophobic core . . . higher elasticity
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EXAMPLE – CONFORMATION CHANGES
temperature ramp - polyacrylamide
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EXAMPLE – LIGAND BINDING
Mg2+ to polyriboadenilic acid
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EXAMPLE – AGGREGATION
carbonic anhydrase, temperature induced
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EXAMPLE – MICROEMULSION
lipid+surfactant+cosurfactant and water
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QUANTITATIVE INTERPRETATION – PRINCIPLES
velocity of sound
2/10)ρ/( Pu )/ρ)(ρ/1(β P
sound – longitudinal wave• causes local variation of the density, pressure
• finite compressibility energy transports across the space
compressibility
2/1)βρ/1(u
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QUANTITATIVE INTERPRETATION – DECOMPOSITION
DILUTE SOLUTIONS
(adiabatic)
apparent molar volume
20
11V /)(φ nVnV
apparent molar compressibility
20
11KS /)ββ(φ nn
solution solute
solvent
hMV Δφ VV rhMKS Δφ KKK
M…solute h…hydration r…relaxationcontributions
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QUANTITATIVE INTERPRETATION – CONCLUSION
concentration increment of ultrasound velocity
KM …constantKr …from frequency dependence of attenuationKh …evaluated
)ρ/()( 000 muuuA
solutionsolvent
molality
)β2/()Δ(Δ)Δ(ΔΔ 0hh KVA
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NaHu - CONCENTRATION
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NaHu + ACID … KINETICS
0.5g/L NaHu
pH: 7 3.5
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NaHu + ACID … VELOCITY
-0.08
-0.06
-0.04
-0.02
0
0.01 0.05 0.08 0.1 0.2 0.5 0.8 1 2
NaHu concentration (g/L)
velo
city
cha
nge
(m/s
)
HCl
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NaHu + ACID … VELOCITY
NaHu concentration (g/L)
velo
city
cha
nge
(m/s
)
-0.1
0
0.1
0.2
0.3
0.01 0.05 0.08 0.1 0.2 0.5 0.8 1 2
propionic
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NaHu + PROPANOL … VELOCITY
NaHu concentration (g/L)
velo
city
cha
nge
(m/s
)
-0.2
-0.15
-0.1
-0.05
0
0.05
0.01 0.05 0.08 0.1 0.2 0.5 0.8 1 2
propanol
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Cu2+ + SALYCILIC ACIDve
loci
ty (
m/s
ec)
1496
1498
1500
0 10000 20000 30000 40000
time (sec)
blank
sample
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THANKS …
… for your attention