UCLA Putterman Research Group fond that:
Sonoluminescence from xenon bubbles in water driven by a sound field with a frequency of 1 MHz. A flash of light is emitted as the implosion reaches 100 nm in size. The spectrum has all colors ranging from far UV to infrared. The sun is a 5,800 K blackbody and this bubbles is more ultraviolet than a 10,000 K blackbody.
My questions are the following:
1- Is it possible to observe this phenomenon each time when introduced a bubble of Xenon?
2- Is it possible to repeat this experiment several times (tens or hundreds times) for the same water sample?
Best regards
I have read that sonoluminescence can produce EM spectra equivalent to 100,000K, and I don't see why the water sample would be affected - surely it's a mechanical process?
Are you trying to reproduce the experiment? At 1 MHz you will need a very sensitive camera (like a EMCCD) and dark room. Xenon is a good choice as it has a low thermal conductivity therefore heat will not dissipate as quickly from the bubbles and the flash can last up to 350 picoseconds. In my own experiments I have noticed a slight decrease in SL over time, but you will have to see. What exactly are you measuring?
Dear Richard,
Thank you for your answer,
Unfortunately our laboratory is not equipped with this kind of material.
My question is: Is it possible to reproduce this phenomenon several times in the same water sample?
Best regards
I am unsure what you mean by several times, during the sonication process there will be many bursts of light. If you are talking about experimentation for a set time period, then turning everything off and starting again then I do not have a direct answer to this question as it depends on several other factors.
In short, the liquid properties will change. For example, at high frequency there will be an increase in the quasi acoustic streaming that takes place, this in turn can cause agitation at the liquid surface and increase the gas content of the solution. Also what powers would you be using? At higher powers there is an increase in streaming, coalescence and temperature of solution. Whilst gas is lost during sonication, streaming can aid in replacing the gas content. Coalescence can cause degassing and lead to a reduction in the numbers of SL bubbles (although at high frequencies coalescence can be beneficial). The temperature of the solution can have a significant role on the amount of SL taking place, therefore for long sonication times may be an issue.
Coming back to your original question, In my opinion yes, it is possible. Cavitation cycles can last millions if not billions of cycles, BUT what I'm trying to explain above is that, the amount of light emission will not remain constant and can decrease significantly. The amount of light emission will depend on how the properties of the fluid change over time.
Why would you want to use the same solution?
It depends on the aims of your experiment, I am unsure what you are trying to do(?)
Just some ideas, hope that helps a little.
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