Could i use fix wall srd command to creat a wall as a membrane in the middle of simulation box that is filled with srd particles so that srd particles cannot pass from this membrane and when they approach the membrane, they are repulsed by mambrane.
Best regards

Doubt that anyone has tried this, but the wall defined by fix srd/wall does
only interact with SRD particles. So I suppose large colloidal particles
could pass thru it and interact with another fix wall/colloid.