Effect of Al(NO sub(3)) sub(3) on suppression of the reduction of Ag ions in a poly(vinylpyrrolidone)/AgClO sub(4) complex membrane

Our previous study showed that the incorporation of Al(NO sub(3)) sub(3) into a polymer/AgBF sub(4) complex could enhance the long-term stability of film capable of showing the antibacterial effect and olefin/paraffin separation, because the Ag super(+) ions were not easily converted into Ag nanoparticles. In this study, the effect of Al(NO sub(3)) sub(3) on the suppression of the reduction of the Ag super(+) ions originating from the AgClO sub(4) in the polymer was investigated, because AgClO sub(4) is more cost effective than AgBF sub(4). As a result, the use of Al(NO sub(3)) sub(3) was found to suppress the reduction of Ag super(+) ions originating from the AgClO sub(4) salt, whereby the stability of the Ag super(+) ions was largely enhanced even though it is well known that these ions are readily reduced to Ag nanoparticles. Actually, Ag nanoparticles were shown to easily form from the poly(vinylpyrrolidone)/AgClO sub(4) complex in the absence of Al(NO sub(3)) sub(3), as confirmed by transmission electron microscopy (TEM) and UV-vis spectra.