Envelope dust-acoustic solitons in a warm dusty plasma with two ion species

The nonlinear wave modulation of dust acoustic envelope solitons in a collisionless unmagnetized dusty plasma with isothermal electrons and two temperature ion species has been studied. For this purpose, the reductive perturbation technique is used to reduce the basic set of fluid equations to nonlinear Schrödinger-type equation. The latter has different envelope structures. It is found that the fluid pressure and the ion temperatures affect on the profile as well as on the instability of the envelope solitons.