Fig. revealed that AcAc-Zr was filled in the porous substrates with a large amount, about 48 wt.%, when the pore size of the substrate is 30 nm or less. The size of AcAc-Zr is small, about 2~5 nm , and thus it is reasonable that Acac-Zr occupies the pores. In contrast, the substrates with a pore size of 50 nm, 70 nm, and 100 nm could not be filled and their transparency did not change after pore-fillling. It is an intriguing phenomenon because the smaller pore should be more difficult to be filled than larger pores, although the results are opposite. The plausible explanation is the hydrophobic interaction between AcAc groups and PE substrate. The surface area of the 30 nm substrate is larger than that of the 50 nm substrate when their porosity is the same, resulting in more hydrophobic interaction based on the Acac-chelating. Therefore, the surface modification for the interaction seems essential to fill singly inorganic into a substrate at high contents.