Reversible Pattern Formation through Photolysis Timothy R. Kline Ayusman Sen 10.1021/la061165+.s004 https://acs.figshare.com/articles/media/Reversible_Pattern_Formation_through_Photolysis/3371824 We report a photolytic method to induce spatial and temporal patterning/deposition of particles at the micron scale on a time scale of seconds. Reversible pattern formation by negatively charged particles occur around micron-sized silver features on different substrates when exposed to UV light in the presence of aqueous hydrogen peroxide. Diffusiophoretic motion due to a spatially defined ion gradient accounts for our observations. Atomic force and optical microscopy, as well as conductivity measurements, support this hypothesis. 2006-08-15 00:00:00 ion gradient accounts presence hydrogen peroxide Diffusiophoretic motion patterning Reversible pattern formation time scale Atomic force substrate UV light conductivity measurements microscopy Photolysi photolytic method micron scale hypothesis Reversible Pattern Formation