CO2 Gel Conception

I am looking to make a gel with a high concentration as possible of carbon dioxide in it. The gel should be made with gelatin preferrably. It will be applied topically on the skin such as in this video - [login to view URL] The co2 will get released into the skin for therapeutic purposes. I have a co2 tank and can get some other equipment if necessary. The key is keeping the co2 within the mixture until it's ready to be used. So perhaps an air tight bottle like with soda pop. Looking for someone to create a procedure on how to do this. Thanks!