# Does adsorption occur between liquids?

While reading a paper in a field other than chemistry, the author mentions a phenomena that he labelled "adsorption" and describes it as follows:

...I am told (though I do not know which liquids they are), there are distinct liquids such that pouring 1 litre of one into a container already containing 1 litre of the other does not result in there being 2 litres of liquid in the container (adsorption).

Now, I know almost nothing about adsorption beyond what I just read on Wikipedia, but I didn't see an example there where two liquids interacted in the way described. Instead, the examples seemed to be ones where a porous solid (e.g., activated charcoal) adsorbs some liquid.

Does this occur between two liquids? If so, what's an example and how does it work in the absence of pores?

• Do you mean aBsorption, as opposed to aDsoprtion? They are not to be confused. – LiamH Oct 21 '15 at 9:34
• @LiamH Yep, I know. Not sure what the author meant to write, but he definitely wrote aDSorption -- no doubt a large part of what confused me. – Dennis Oct 21 '15 at 12:23

It might be an interesting study to investigate where the crossover between adsorption and solvation happens as a function of molecule size. After all, graphene is just a really big molecule and its adsorption properties are pretty great. A brief search on adsorption solvation crossover reveals that there is some investigation that has been done on the process of going from a 3D gas $\ce{->}$ 2D adsorbate $\ce{->}$ aqueous solvate here.