I am using Bruker MLCT tips to study polystyrene in water. I sometimes have been able to get plateaus, but then nothing works. I use toluene to dissolve the polymer before spincoating onto piranha cleaned silicon, and I filter all of the solutions before I use them with 0.2um filters (PTFE or PES if it's organic or aqueous). When I do the force volume maps, i can see small interactions between the tip and the surface past the adhesion area, but nothing is a true plateau.

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