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- ItemMicroscopic visco-elastic motions of narrow two-dimensional dust Coulomb liquids under modulated shear stress([London] : IOP, 2003) Chang, Ming-Hua; I, LinThe microscopic visco-elastic motion of a quasi-2D dusty plasma liquid confined to a width of about 15 interparticle distances under square stress pulses shorter than thermal relaxation time from a chopped laser beam is investigated experimentally. The stress-enhanced excitations of hopping vortices are responsible for particles in the laser driven zone reaching, after a higher initial velocity, a constant nonzero terminal forward velocity and partial plastic deformation through the loss of the structure memory. The driven particles around domains with caged shear motion still partially keep the structural memory and demonstrate partial elastic backwards motion with exponential relaxation after turning off the laser.
- ItemDust as a surfactant([London] : IOP, 2003) Ignatov, A. M.; Schram, P. P. J. M.; Trigger, S. A.We argue that dust immersed in a plasma sheath acts as a surfactant. By considering the momentum balance in a plasma sheath, we evaluate the dependence of the plasma surface pressure on the dust density. It is shown that the dust may reduce the surface pressure, giving rise to a sufficiently strong tangential force. The latter is capable of confining the dust layer inside the sheath in the direction perpendicular to the ion flow.
- ItemMutual interactions of magnetized particles in complex plasmas([London] : IOP, 2003) Yaroshenko, V. V.; Morfill, G. E.; Samsonov, D.; Vladimirov, S. V.Various mutual dust-dust interactions in complex plasmas, including the forces due to induced magnetic and electric moments of the grains are discussed. It is shown that the dipole short-range forces can be responsible for the formation of field-aligned chains. Such chains may incorporate a few tens of individual particles, as frequently observed in experiments.