We have developed a hierarchical nanoporous layer (HNL) on silicate glass by a simple one-pot etching method. The HNL has a three-dimensionally continuous spongelike structure with a pore size of a few tens of nanometers on its apparent surface. The pore size gradually decreases from the apparent surface to the HNL-bulk interface. This HNL bestows significant properties to glass: low optical reflectivity that reflects 7% less visible light than nontreated glass and long-persistence superhydrophilicity that keeps its water contact angle at about 5° for more than 1 year. The superhydrophilicity also realizes antifogging and antifouling functionalities.

We investigated nano-frictional properties of sodium polystyrene sulfonate (NaPSS) brushes in water by Friction Force Microscopy (FFM). The polyelectrolyte brushes were prepared on silicon wafers by"grafting to"method. Sliding speed and load dependence of the nano-friction on the NaPSS brush in water revealed a significantly low friction value that weakly varies with both parameters. Furthermore, high in-plane homogeneity in the frictional properties was indicated.

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