Pairing-specific microstructure in depletion gels of bidisperse colloids.

We report the ensemble-averaged and pairing-specific network microstructure formed by short-range depletion attractions in hard sphere-like colloidal systems. Gelation is induced by adding polystyrene molecules at a fixed concentration to colloids with different colloid bidispersity ratios ( = 1, 0.72, and 0.