Produced bubble in a chemical reaction

[Yinxiao Li]

Hi,
I have a very interesting but challenging question. Consider any chemical reaction that involves gas production (e.g. H2 gas is produced in KOH etching silicon). As we know, the produced gas will detach from the surface and reaction can continue. What if the gas doesn't detach from the surface and form a thin film? The gas will stop the reaction from continuing!
So the question is how I can study the volume of the gas produced that stops the reaction? Any materials or concepts that might be relevant?

 

[Hyo X]

i might guess that young's equation for equilibrium at a triple interface - in this case, solid, liquid, gas, interface, might be helpful
https://en.wikipedia.org/wiki/Wetting#Ideal_solid_surfaces
your case is slightly different than normal but should still be aplicable if you get all the right values for surface tension, etc.
My guess is that gas is always going to form a bubble, and as long as your surface sizes are large enough (micron) compared to bubble size, the bubbles will escape from the surface due to a lower density (than liquid) before they form a thin film and prevent further reaction.