Extended Data Fig. 2: Colour change during layer formation in acetic acid.
From: Structural colour using organized microfibrillation in glassy polymer films
Crosslinked polystyrene film (28 kDa) is submerged in acetic acid and porous layers are formed within one minute. Images show snapshots of the stepwise colour change that occurs during the formation of the layers. The time after submersion is indicated in each image. Images were captured using a digital single-lens reflex camera with a macro-lens (EOS Kiss X5, Canon and 60-mm EFS, Canon); see Supplementary Video 1. We found that the large-scale colour change can begin from any location on the film including the centre (as shown), edges and corners, depending on the local film condition. The final structure and in-plane layer formation dynamics as discussed within this paper are independent of these large-scale colour change effects.
