The Shell subnode is available from the context menu (right-click the Dielectrophoretic Force parent node) or from the Physics toolbar, Attributes menu. Add Shell subnodes to a Dielectrophoretic Force node to compute an equivalent Clausius–Mossotti factor using the electrical properties of the interior of the particle and one or more thin layers on its surface. In other words, use the Shell subnode to model dielectrophoresis of spherical particles with thin outer membranes.

If multiple Shell subnodes are present, their order in the Model Builder determines how the nested shells are modeled, with the first subnode constituting the innermost layer.

Enter the Shell thickness ts (SI unit: m). The default is 0.1 μm. Enter a value for the Shell relative permittivity εr,s (dimensionless). The default is 1. Enter a Shell electrical conductivity σs (SI unit: S/m). The default is 1 S/m.