Ceramic Society of Japan Acta Medica Okayama 1348-6535 133 7 2025 Underwater superoleophobic NaNbO3-based photocatalyst thin films prepared on bare soda-lime glass by sol–gel process 393 399 EN Shunsuke Nishimoto Graduate School of Environmental, Life, Natural Science and Technology, Okayama University Kazuya Kageyama Graduate School of Environmental, Life, Natural Science and Technology, Okayama University Shusuke Egusa Graduate School of Environmental, Life, Natural Science and Technology, Okayama University Yoshikazu Kameshima Graduate School of Environmental, Life, Natural Science and Technology, Okayama University A self-cleaning flat transparent thin photocatalyst film was prepared on a bare soda-lime glass by a simple method using niobium alkoxide solution, which is a common coating solution for the sol–gel method. The film consisted of crystalline NaNbO3 and Na2Nb2O6·H2O phases. It was suggested that NaNbO3 and Na2Nb2O6·H2O were directly formed between the soda-lime glass and the niobium alkoxide coating solution during the heat treatment. Under UV irradiation, the film surface exhibited low photocatalytic oxidation activity and excellent photo-induced hydrophilicity. The hydrophilic state of the sample was maintained for 1 month in the dark, while the hydrophilicity of TiO2 sample prepared by a sol–gel method was decreased within 5 days in the dark. Additionally, the surface demonstrated excellent underwater oil repellency toward n-hexadecane and oleic acid and the ability to remove the adsorbed oily contaminant in water. These properties were also superior to those of the TiO2 surface. No potential conflict of interest relevant to this article was reported.

Acta Medica Okayama 2006 機能性層状ペロブスカイトの合成と構造化学に関する研究 EN Shunsuke Nishimoto No potential conflict of interest relevant to this article was reported.