Hi all, this a question from the realm of soil biogeochemistry. I was wondering about the colloidal fraction of soil, a hotspot area of chemical activity within soils.
I've often read about the colloidal fraction, basically it's the subset of the smallest mineral and organic soil particles (<0.001mm).
Is this particle set always suspended in a liquid?
If so what liquid?
If it's mostly water, can that liquid "dry out" and if so are those very small particles now no longer in a liquid and hence no longer a colloid?
Since a colloid has to be something dispersed/suspended in something else (clay in water or even oil in water) then you need a dispersing "phase". Very interesting things can happen as the amount of dispersing phase decreases relative to the amount of dispersed phase.