1. Analysis the power during the
process gold nanoparticles growth
made by ultrasonic irradiation
Department of Sustainable System Sciences
Tanaka Yuki
Nov. 30th
2. Contents
1 Analysis the power during the process gold nanoparticles growth
made by ultrasonic irradiation
1.1 | The purpose of this study
1.2 | Reaction Principles
1.3 | Surface Plasmon Resonance ( Not complete )
1.4 | Analysis of GNPs Growth with UV-vis
1.5 | Experiment and results
1.6 | Discussion
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3. Contents
2 The effect of substances in the solution on the bubbles caused
by ultrasonic irradiation
2.1 | Experimental method
2.2 | Substances
2.3 | Results and consideration
3 Conclusion
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4. The purpose of this study
• To control the size of gold nanoparticles
(GNPs) by changing the ultrasonic intensity
• To find more easier process of this than
previous method
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1) Stepwise Preparation of Spherical Gold Nanoparticles Passivated with
Cationic Amphiphiles, Yuki Inoue,Yo Tsutamoto,Daiki Muko,
ANALYTICAL SCIENCES,2016,vo.32,p 875~880
5. Reaction principle of GNP seeds made by
ultrasonic irradiation
Au(Ⅰ) Stabilized with
Cetyl trimethyl ammonium bromide(CTAB)
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Au+
Ultrasonic irradiation
AuPyrolysis
H2O →・OH + ・H
Radical reaction
RH +・OH → M + H2O
RH +・H → M + H2
Au(Ⅰ) reduction action
Au(Ⅰ) + M → Au + H+ + M`
Au
Under ascorbic asid
Au(Ⅰ)seeds formation reaction
m Au → Au m
Au seed
~5nm
Au
Au
6. Reaction principle of growth of GNP seeds
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Au
Au+
Au
Au
Growth of GNP seeds
Au m + Au → Au m+1
GNPs (5 ~ 100 nm)
9. Experimental method
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About
60 ml
28℃
4mm
Ultrasonic
oscillator
HAuCl4
CTAB
Ascorbic acid
Thermocouple
Under Ar Irradiation
Frequency : 200 kHz
Output : 200 W
Irradiation time : 2 min
Measured GNPs growth
with UV-vis
Measured temperature change
with thermocouple
10. Results ~ analysis of GNPs growth ~
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0
0.1
0.2
0.3
0.4
0.5
250 350 450 550 650 750
Absorbance
Wave length ( nm )
20 min
18 min
16 min
14 min
12 min
10 min
8 min
6 min
4 min
2 min
Standing time
11. Results ~ temperature change ~
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28
29
30
31
32
33
34
35
0 50 100 150
Solutiontemperature(℃)
Time ( s )
Pure water
Au solution
Stopped
irradiation
Temperature difference
Au solutionPure water
33.1 ℃ 34.2 ℃
* Temperature after irradiation stopped
13. Discussion
・Substances dissolved in solution effect on the bubbles
・Before control the size of gold nanoparticles (GNPs) by
changing the ultrasonic intensity, experienced the
effect of dissolved substances.
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Possibility
14. The effect of substances in the
solution on the bubbles caused
by ultrasonic irradiation
15. Experimental method
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About
60 ml
28℃
4mm
Ultrasonic
oscillator
Under Ar Irradiation
Frequency : 200 kHz
Output : 200 W
Irradiation time : 2 min
Measured temperature change
with thermocouple
Thermocouple
Methanol
or
Isopropanol
17. Results ~ temperature change ~
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28
29
30
31
32
33
34
35
36
37
0 50 100 150
Solutiontemperature(℃)
Time (s)
▲ Methanol
■ Pure water
◆ Isopropanol
Stopped
irradiation
Temperature difference
Obtained Data
Methanol > Pure water > Isopropanol
Why did not ?
Isopropanol > Pure water
18. Consideration
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A bubble in the Isopropanol solution
Cavitation bubble
Hydrophobic substances
adhered on the surface of the bubbles
effect on the bubble`s characteristic.
19. Conclusion
• Substances in the solution probably effect on the bubble
characteristic
• The condition that the bubble`s change should be considered
to control the size of gold nanoparticles (GNPs) by changing
the ultrasonic intensity
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