Limits...
Optimal synthesis and characterization of Ag nanofluids by electrical explosion of wires in liquids.

Ju Park E, Won Lee S, Bang IC, Park HW - Nanoscale Res Lett (2011)

Bottom Line: In this study, we optimized the fabrication method and examined the effects of manufacturing process parameters.The average Ag nanoparticle size in water was 118.9 nm and the zeta potential was -42.5 mV.The critical heat flux of the 0.001-vol.% Ag nanofluid was higher than pure water.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Mechanical and Advanced Materials Engineering, UNIST 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan Metropolitan City 689-798, Republic of Korea. hwpark@unist.ac.kr.

ABSTRACT
Silver nanoparticles were produced by electrical explosion of wires in liquids with no additive. In this study, we optimized the fabrication method and examined the effects of manufacturing process parameters. Morphology and size of the Ag nanoparticles were determined using transmission electron microscopy and field-emission scanning electron microscopy. Size and zeta potential were analyzed using dynamic light scattering. A response optimization technique showed that optimal conditions were achieved when capacitance was 30 μF, wire length was 38 mm, liquid volume was 500 mL, and the liquid type was deionized water. The average Ag nanoparticle size in water was 118.9 nm and the zeta potential was -42.5 mV. The critical heat flux of the 0.001-vol.% Ag nanofluid was higher than pure water.

No MeSH data available.


Related in: MedlinePlus

Voltage, current, and energy deposited in the wire during the explosion process.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211281&req=5

Figure 3: Voltage, current, and energy deposited in the wire during the explosion process.

Mentions: Figure 3 shows the current and voltage waveform measurements. When the capacitor was discharged, the current decreased, and after a certain time, a sudden current drop and sharp rise in voltage occurred. The current drop and voltage rise resulted from an increase in the resistivity of the wire due to vaporization. The resistance increased several orders of magnitude, and the current in the circuit was interrupted. The inductive energy stored in the stray inductance of the circuit generated a high voltage, which was higher than the initial voltage of the capacitor. Once vaporization occurred, an arc discharge formed between the electrodes, and the current flowed through the low-resistance arc plasma. Thus, the wire was heated and vaporized by the energy deposited in the wire until the arc discharged.


Optimal synthesis and characterization of Ag nanofluids by electrical explosion of wires in liquids.

Ju Park E, Won Lee S, Bang IC, Park HW - Nanoscale Res Lett (2011)

Voltage, current, and energy deposited in the wire during the explosion process.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211281&req=5

Figure 3: Voltage, current, and energy deposited in the wire during the explosion process.
Mentions: Figure 3 shows the current and voltage waveform measurements. When the capacitor was discharged, the current decreased, and after a certain time, a sudden current drop and sharp rise in voltage occurred. The current drop and voltage rise resulted from an increase in the resistivity of the wire due to vaporization. The resistance increased several orders of magnitude, and the current in the circuit was interrupted. The inductive energy stored in the stray inductance of the circuit generated a high voltage, which was higher than the initial voltage of the capacitor. Once vaporization occurred, an arc discharge formed between the electrodes, and the current flowed through the low-resistance arc plasma. Thus, the wire was heated and vaporized by the energy deposited in the wire until the arc discharged.

Bottom Line: In this study, we optimized the fabrication method and examined the effects of manufacturing process parameters.The average Ag nanoparticle size in water was 118.9 nm and the zeta potential was -42.5 mV.The critical heat flux of the 0.001-vol.% Ag nanofluid was higher than pure water.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Mechanical and Advanced Materials Engineering, UNIST 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan Metropolitan City 689-798, Republic of Korea. hwpark@unist.ac.kr.

ABSTRACT
Silver nanoparticles were produced by electrical explosion of wires in liquids with no additive. In this study, we optimized the fabrication method and examined the effects of manufacturing process parameters. Morphology and size of the Ag nanoparticles were determined using transmission electron microscopy and field-emission scanning electron microscopy. Size and zeta potential were analyzed using dynamic light scattering. A response optimization technique showed that optimal conditions were achieved when capacitance was 30 μF, wire length was 38 mm, liquid volume was 500 mL, and the liquid type was deionized water. The average Ag nanoparticle size in water was 118.9 nm and the zeta potential was -42.5 mV. The critical heat flux of the 0.001-vol.% Ag nanofluid was higher than pure water.

No MeSH data available.


Related in: MedlinePlus