[contact_fusion]

Liquefaction has nothing to do with triboelectricity.

The article has a pretty good description of how liquefaction proceeds: higher pressure -> water present in material reduces contact between solid particles -> material friction reduced -> material behaves like a fluid. If you want more, find a book on basic rheology. I'm certain there are civil engineering textbooks that contain the material.

Further, it does not stand to reason that charged materials would suddenly acquire fluid properties. Solid materials are quite capable of sustaining charge without changing their bulk properties. Prior to significant change, local voltages would exceed the breakdown voltage and the charge would be neutralized.

[ChuckMcM]

You are offering to do the experiment? The physics is pretty straight forward, particles which share the same charge will repel each other, this will hold them apart and allow them to 'slide past' each other just as diamagnetic material float along a magnetic field.