Figure 4: Structural design and water-jet printing of RP.
From: Hydrochromic molecular switches for water-jet rewritable paper
(a) Schematic illustrations of the four-layer structure used to create the RP materials based on 1. (i) Filter paper is used as the substrate layer; (ii) PEG is used as the passivation layer; (iii) a thin film of PEG in which 1C is dissolved serves as the imaging layer; (iv) a film of PEG coated on top acts as a protection layer. (b) Schematic illustrations of a printing-reuse cycle of paper based on water-jet RP. Photographs of the letters produced by water-jet printing on this RP (above) followed erasing of those images by mild heating (below). Scale bar=5 mm.
