I am doing research on tin and tin-oxide nanoparticle using laser ablation method and used de-ionized water, acetone, ethanol and methanol as liquid media. I have varied the energy from 60 to 240 mJ for de-ionized water however for other liquid varied it from 30 to 60mJ. The oxidation rate increases with the decreases in energy when liquid was de-ionized water whereas for other liquid its opposite occurs. Why these liquid behaving differently so?
In two different research paper i have studied that that there is a threshold of laser flunece after which laser interact more with the liquid which causes an increase in oxidation rate.
The oxidation rate is not constant due to the sizes of distributions of particles in laser ablation in liquid media.J. Phys. Chem. C, 2016, 120 (17), pp 9453–9463
Dear Tanzeeha Jafari,
In my opinion, you have two main points related to this subject. First, your energy distribution profile is nearly Gaussian, so the energy distribution is not homogeneous in the area affected by the laser radiation. Second, you need to understand better the properties of your liquids. Certainly, the energy required to break the bonds is different depending on the liquid. The work function changes. I think that at least these two factors influence the variation on oxidation rate.
I hope you can find it out.
Best regards,
Acetone, ethanol and methanol appear to be chemically inert and do not decompose easily...nonetheless, in a less likely circumstance, if one or more of your liquids are reactive upon laser irradiation, you might want to have a look at reactive medium story "Laser-Induced Liquefaction of Tetrafluoroethane and Sulfur Hexafluoride Gases", The Journal of Physical Chemistry C 115(12) · January 2011.
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