The cover glass was hung upside down for one day under ambient conditions. Later on, the surface was observed again using AFM. Figure 3 shows an AFM image of the surface. It can be seen that the particles did not peel off from the surface.
These images show that NanoYo Japan TiO 2 particles can adhere even on very flat glass and can hardly be removed from the glass.
It is easy to conclude that it is much more difficult to pull particles away from rough surfaces such as fabric, wood, and wall materials.
Shuji Adachi Professor of
Division of Food Science and Biotechnology, Kyoto University, Kyoto 606-8502, Japan