I would like to know if there is some criteria when defining a new material, since when I define the material interface, for example, gold-organic layer-fluid DEVICE does not allow me to add the new material created to the set of interfaces with gold.
I also tried to define a solid water material as insulator and again I was not able to add this material to the set of interfaces with gold.
Is there a reason for this? Can I create organic materials (insulator or semiconductor)?
By default boundary conditions are assumed to be insulating, unless you set them to something else. This means that you do not need to define a BC if they are insulated.
The solver boundary will be applied to the solid. So, for example, if solver is connected to a bath, all the objects touching the solver will be connected to bath. If you define a new solid/solver BC, it will override the solver BC which means that you can define different BCs for solids on the solver boundary.