Figure 1
From: Manipulation of small particles at solid liquid interface: light driven diffusioosmosis
(a) Scheme of the experimental setup, consisting of a micro-channel filled with surfactant-water solution. Silica particles of 2 μm in diameter are adsorbed at the solid-liquid interface. Subsequently, irradiation with UV light is initiated, and a local removal of particles is achieved. (b) Chemical structure of an azobenzene containing cationic surfactant. Shown below is a scheme of the photo-isomerization of the azobenzene group. (c) Five snapshots (after irradiation time 1 s, 10 s, 30 s, 60 s and 5 minutes, documenting successive stages of the “cleansing”. A corresponding movie is provided as Supplementary Video 1.
