I can see a use in this. Especially if someone wants to tackle the task of the infamous singularity reactor. As far as storing elements, It would be interesting to see a gas type particle do this. Especially if it picks up the particle and when hit by a photon, the particle doesnt come back. It would be almost like using a void gas. As far as what  should make it, Noble gas should be out of the question. I think carbon would be a lot better since it tends to sink to the thing nearest it giving it more chance of touching GEL. Other than that, great idea! I hope it gets implemented. :)

I was talking about Co2. It would be better to mix it with GEL than another gas. NBLE already has a lot of things it is doing. we don't need to add another thing to a very large list. Co2 and GEL are fairly new elements that would be perfect candidates for causing a reaction to make a new particle. As for the particle its self, I would like to see more feedback from it. I think it is one of the better suggestions out there right now.

Sorry 

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I do quite like this. Simmilar to gel, yet as a gas.