Suspension Stability of Nano-Au and Nano-Ag Colloids Prepared by Electrical Spark Discharge Method

Tseng, Kuo-Hsiung; Chung, Meng-Yun; Chiu, Juei-Long

doi:10.1007/s10876-017-1249-2

Cited by 9 publications

(4 citation statements)

References 26 publications

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“…When the particle size is 1-10 µm, the force between the particles is considerably affected by gravity, and the particles combine into larger particles after mutual attraction and collision, causing particle precipitation. When the particle size is less than 0.1 µm, van der Waals and electrostatic repulsive forces affect the suspension of particles considerably [18,19]. When the repulsive force between NPs is greater than the attractive force, it can maintain a proper equilibrium distance between particles and prevent aggregation and precipitation between them, ensuring the colloid is in a stable state.…”

Section: Principles Of Electrical Spark Discharge Methodsmentioning

confidence: 99%

Fabrication of nano-bismuth colloids in deionized water using an electrical discharge machine

Tseng

Hsieh²,

Chung

2020

Nanotechnology

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Bismuth (Bi) is used to treat certain diseases, however the Bi powder or colloids used in medicine must be nonpolluting and safe. The use of electrical discharge machines (EDMs) to produce nano-Bi powder is a green process. A nonpolluting and safe nano-Bi colloid can be produced swiftly and easily in deionized water using the electrical spark discharge method, adjusting the discharge pulse width Ton, Toff and the discharge current IP of the EDM. Transmission electron microscopy (TEM), energy-dispersive x-ray spectroscopy, the Zetasizer technique, ultraviolet–visible spectroscopy (UV–Vis), and other techniques were used to analyze a nano-Bi colloid prepared under various discharge parameters to optimize the preparation of Bi nanoparticles (Bi-NPs) using EDMs. The results of this study indicated that Bi-NP colloids were successfully prepared using EDM. TEM images revealed that the NPs were smaller than 50 nm with only the Bi element in the colloid. Furthermore, the zeta potential of the nano-Bi colloid exceeded 30 mV, which indicated that the suspension of the colloid was excellent. A UV–Vis absorption peak was observed at approximately 234–237 nm.

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Section: Principles Of Electrical Spark Discharge Methodsmentioning

confidence: 99%

Fabrication of nano-bismuth colloids in deionized water using an electrical discharge machine

Tseng

Hsieh²,

Chung

2020

Nanotechnology

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“…The suspension stability of graphene sheets in the graphene colloids was confirmed using the Zetasizer (NanoZS90, Malvern) electrophoretic measurement technique, and the suspension stability was determined according to the zeta potential. When the absolute value of the zeta potential was greater than −30 mV, the sample was considered to have high suspension stability [19]. After the detection of the graphene colloids prepared using five different Ton:T o parameters, the data were compared to find the most suitable Ton:T o parameters for the preparing graphene colloids, and Raman spectroscopy (Ramboss 500i, DONGWOO) and TEM (HRTEM, JEM2100F) were used for analysis.…”

Section: Experimental Methodsmentioning

confidence: 99%

Parameter control and concentration analysis of graphene colloids prepared by electric spark discharge method

Tseng

Tien

et al. 2019

Nanotechnology Reviews

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In this study, graphene colloids were prepared using the electric spark discharge method (ESDM) with graphite rods (99.9% purity) in deionized water (DW) at a normal temperature and pressure. Five different types of graphene colloids were prepared using an electrical discharge machine (EDM) with five different pulse cycle switching times (Ton:Toff ) = 10:10, 30:30, 50:50, 70:70, and 90:90 μs. According to the Ultraviolet-visible spectra (UV-Vis) and Zetasizer analysis, the results showed that the 10:10 μs parameter was the most suitable for the preparation of graphene colloids. UV-Vis was also used to detect the concentration of the graphene colloids; a comparison with a graphene oxide (GO) confirmed that this method could be used to calculate the discharge time needed to produce graphene colloids with different concentrations in the ESDM process.

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“…This method can also be implemented in nanocolloid preparation. 19,20 This involves generating spark discharge through the energy generated in a strong electric eld when the distance between the two electrodes is adequately short, converting the electrical energy to thermal energy of 5000-6000 K 21 and using it to melt the workpiece and remove the material from its surface. Fig.…”

Section: B Principle Of Esdm In Colloid Preparationmentioning

confidence: 99%

Parameter control and property analysis in the preparation of platinum iodide nanocolloids through the electrical spark discharge method

et al. 2020

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Suspension Stability of Nano-Au and Nano-Ag Colloids Prepared by Electrical Spark Discharge Method

Cited by 9 publications

References 26 publications

Fabrication of nano-bismuth colloids in deionized water using an electrical discharge machine

Fabrication of nano-bismuth colloids in deionized water using an electrical discharge machine

Parameter control and concentration analysis of graphene colloids prepared by electric spark discharge method

Parameter control and property analysis in the preparation of platinum iodide nanocolloids through the electrical spark discharge method

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