Self-Assembled Membranes and Chirality Driven Transitions from 2D Surfaces into 1D Ribbons*

We briefly outline conditions under which homogeneous non-amphiphilic colloidal rods self-assemble into two-dimensional fluid-like surfaces or membranes. Stabilized by entropic forces, these membranes have properties that are identical to lipid bilayers. ~We then focus on experiments in which the chirality of the constituent particles induces the transition from achiral 2D membranes into 1D twisted ribbons. The model system developed is unique, both in our ability to tune chiral interactions between constituent particles and directly visualize the structure and fluctuations of the final assemblage on all relevant lengthscales. These features allow us to test the theoretical model describing the transition from chiral ribbons to achiral membranes in great detail.