title: Dynamics and collapse of two-dimensional colloidal lattices.
abstract: One interesting aspect of colloidal particles is the formation of colloidal crystals at the 2D and 3D levels. Here we report the dynamics and collapse of colloidal lattices at liquid-liquid interfaces using Pickering emulsions as an experimental template. The colloidal particles oscillate around their equilibrium positions. The short-time diffusion constant (<10 s) of single particles increases with increasing lattice spacing; the oil-phase viscosity has an effect on diffusion only at large interparticle distances. Strikingly, we observe that the equilibrium structure can be disturbed when increasing the output laser intensity in a confocal laser scanning microscope, which leads to the collapse of colloidal lattices in the presence of small laser powers.
authors.affiliation: Department of Chemical Engineering, Texas Tech University, MS 3121, Lubbock, Texas 79409, USA.
authors.forename: Sowmitri
authors.initials: S
authors.lastname: Tarimala
authors.forename: Chih-Yuan
authors.initials: CY
authors.lastname: Wu
authors.forename: Lenore L
authors.initials: LL
authors.lastname: Dai