(276d) Self-Assembly By Deionization, Coacervation, and Epitaxy

Guerra, R. - Presenter, New York University
Chaikin, P. M., New York University
Interfacial charging and ionic conductance are ubiquitous properties of colloidal suspensions that also profoundly affect their stability and phase behavior. Rigorous deionization induces long-range electrostatic forces that can drive colloidal crystallization, and small changes in salinity can drive large changes in the assembly of oppositely charged colloidal particles and polyelectrolytes. Here we demonstrate a new technique to control the salinity of colloids in-situ, and show how it may be combined with the physics of polyelectrolyte coacervation and epitaxial templating to produce self-assembled crystals of oppositely charged colloidal particles.