Vasarely painting at the nanoscale on sapphire crystals
nanoscaled Vasarely surfaces, two-dimensional (2D)-self-organization, sapphire vicinal surfaces
We demonstrate that convenient thermal treatment of a specific sapphire vicinal surface can induce the formation of a fully two-dimensional (2D) ordered surface made of a periodic assembly of (006) facets. The similarity between the resulting surface topography and patterns represented in the “hexagon series” of paintings by Vasarely is really striking! We thus propose to call these surfaces as “nanoscaled Vasarely surfaces”. We also show that the self-organization process, which is driven by the minimization of the free energy of a closed system, results in a quasi-linear isothermal growth of the facets’ surface area over time.
Tsinghua University Press
Caroline Matringe,Elsa Thune,Rémy Cavalotti,Ahmad Fakih,Stephan Arnaud,Nils Blanc,Nathalie Boudet,Alessandro Coati,Yves Garreau,David Babonneau,René Guinebretière, Vasarely painting at the nanoscale on sapphire crystals. NanoRes.2020, 13(9): 2512–2516