I am wishing to erode electrodes into nano sized particles in water, using a pulsed electric arc between the electrodes to accomplish the erosion.
What I need is a circuit, or a recommendation for a piece of equipment, that could generate the arc.
Do you know of a do it yourself circuit that can be used to approximate the following pulses:
Would it be easier to buy a pre-made piece of equipment, such as a pulse generator? There are many sold cheaply on Ebay, but they do not seem to produce anything other than square pulses.
The study that I'm looking at is: http://www.ipme.ru/e-journals/RAMS/no_81808/tien.pdf
The study explains the process in detail:
The power supply system provides a stable pulse voltage for etching the Ag electrodes in pure water. In order to ionize the aqua medium between the electrodes, the DC arc-discharge system provides a pulse voltage of 70-100 V for 2-3 ms and then maintains a pulse of 20-40 V for around 10 µs. At that moment the etching current can reach 4 A. The well-controlled on and off timing is shown in Fig. 2. The servo control system based on a feed-back loop controls the gap between the electrodes which is equal to a few microns. The upper Ag electrode (usually the cathode) is held by the servocontrol system and the bottom one (usually the anode) is fixed by the electrode holder. The container with deionized water is maintained and stirred by using the magnetic stirrer at room temperature. Silver wires are used as both the positive and negative electrodes. The pure silver wires areetched by the DC pulse arc-discharge in pure water. The parameters of the control system were chosen for optimal conditions of Ag nanoparticle production.
The governing parameters of this system such as the working voltage, selected current, pulse duration (on/off time), electrode gap, and temperature of the deionized water are crucial factors for nanoparticle production. During the arc-discharge, the surface layer of the Ag wires is evaporated and condensed in the water. The transparent solution converts to a characteristic pale yellow color (Fig. 3), and then a silver suspension is created.
I would also like to be able to vary the parameters some: varying the voltage, amperage, timing, etc, if that is not too complicated.
If you are able to make any recommendations, I would greatly appreciate it.
Thank you for your help.
David.
What I need is a circuit, or a recommendation for a piece of equipment, that could generate the arc.
Do you know of a do it yourself circuit that can be used to approximate the following pulses:
Would it be easier to buy a pre-made piece of equipment, such as a pulse generator? There are many sold cheaply on Ebay, but they do not seem to produce anything other than square pulses.
The study that I'm looking at is: http://www.ipme.ru/e-journals/RAMS/no_81808/tien.pdf
The study explains the process in detail:
The power supply system provides a stable pulse voltage for etching the Ag electrodes in pure water. In order to ionize the aqua medium between the electrodes, the DC arc-discharge system provides a pulse voltage of 70-100 V for 2-3 ms and then maintains a pulse of 20-40 V for around 10 µs. At that moment the etching current can reach 4 A. The well-controlled on and off timing is shown in Fig. 2. The servo control system based on a feed-back loop controls the gap between the electrodes which is equal to a few microns. The upper Ag electrode (usually the cathode) is held by the servocontrol system and the bottom one (usually the anode) is fixed by the electrode holder. The container with deionized water is maintained and stirred by using the magnetic stirrer at room temperature. Silver wires are used as both the positive and negative electrodes. The pure silver wires areetched by the DC pulse arc-discharge in pure water. The parameters of the control system were chosen for optimal conditions of Ag nanoparticle production.
The governing parameters of this system such as the working voltage, selected current, pulse duration (on/off time), electrode gap, and temperature of the deionized water are crucial factors for nanoparticle production. During the arc-discharge, the surface layer of the Ag wires is evaporated and condensed in the water. The transparent solution converts to a characteristic pale yellow color (Fig. 3), and then a silver suspension is created.
I would also like to be able to vary the parameters some: varying the voltage, amperage, timing, etc, if that is not too complicated.
If you are able to make any recommendations, I would greatly appreciate it.
Thank you for your help.
David.