  We present an investigation of the combined effects of the Debye-Huckel (DH)
repulsive and overlaping Debye spheres (ODS) attractive interaction potentials
around charged dust particles on collective modes, phase separation and ordered
dust structures in a strongly coupled dusty plasma. We obtain static and
dynamical information via Molecular Dynamics simulations in the liquid and
crystallized phases and identify the onset of an instability in the transverse
collective mode, by using (zero-temperature) lattice summation method. The
present results are useful for understanding the origin of
coagulation/agglomeration of charged dust particles and the formation of
ordered dust structures in low-temperature laboratory and space dusty plasmas.
