Figure 2
From: Effects of NH4F and distilled water on structure of pores in TiO2 nanotube arrays
Voronoi diagrams of TiO2 nanotube arrays anodized at 60 V for 1 hour in ethylene glycol containing (a–e) 2, 4, 6, 8, 10 vol% distilled water with 0.2 wt% NH4F and (f–j) 2, 4, 6, 8, 10 vol% distilled water with 0.4 wt% NH4F. Coordination numbers of cells are expressed in colors: rachel: 3, orange: 4, yellow: 5, green: 6, blue: 7, violet: 8.
