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Photoinduced Superhydrophilicity in TiO2 Thin Films Modified with WO3
장종산,Kashinath Rangu Patil,김혜경,Shivaram Dattatraya Sathaye,황진수,박상언,황영규 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.10
Tungsten oxide-modified TiO2 thin films were formed on a glass substrate by sol-gel and dip coating processes using acetyl acetone as a chelating agent. The hydrophilic properties of the thin films were investigated with illumination of UV light. The dependence of water contact angle on material composition and morphology of the film is established with SEM image and AFM profile. The surface morphology was controlled with the change of precursor concentration. 0.01 M of tungsten oxide-modified TiO2 have shown the highest hydrophilicity after UV-irradiation. The effect of composition on photoinduced hydrophilicity of the WO3-TiO2 films was also investigated. The films were characterized by XRD, SEM, AFM and XPS.
Pore Size Tunning of Mesoporous Silica Thin Films using Swelling Agent
김덕규,황영규,( Kashinath Rangu Patil ),박상언,장종산 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
Large-pore mesoporous silica thin films were synthesized by incorporating poly (propylene oxide) as a swelling agent with Pluronic F127 block copolymer. The influence of the various synthesis parameters, such as the addition of poly (propylene oxide), the condensation catalyst (HCl, NH3), and the aging time, was systematically explored, especially their influence on the mesostructure, thickness and refractive index. The silica synthesized under typical conditions is a well-ordered cubic Im3m structure with a good quality of cage-like pore structure. The refractive index of 1.21 and total porosity of 59 %(vol) were obtained from cubic thin films.
Photoinduced Superhydrophilicity in TiO<sub>2</sub> Thin Films Modified with WO<sub>3</sub>
Hwang, Young-Kyu,Patil, Kashinath Rangu,Kim, Hye-Kyung,Dattatraya Sathaye, Shivaram,Hwang, Jin-Soo,Park, Sang-Eon,Chang, Jong-San Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.10
Tungsten oxide-modified TiO2 thin films were formed on a glass substrate by sol-gel and dip coating processes using acetyl acetone as a chelating agent. The hydrophilic properties of the thin films were investigated with illumination of UV light. The dependence of water contact angle on material composition and morphology of the film is established with SEM image and AFM profile. The surface morphology was controlled with the change of precursor concentration. 0.01 M of tungsten oxide-modified Ti$O_2$ have shown the highest hydrophilicity after UV-irradiation. The effect of composition on photoinduced hydrophilicity of the W$O_3$-Ti$O_2$ films was also investigated. The films were characterized by XRD, SEM, AFM and XPS.
Awate, Shobhana Vaman,Waghmode, Suresh Babasaheb,Kashinath Rangu,Patil, Agashe, Mangala Shripad,Joshi, Praphulla Narahar 한국화학공학회 2001 Korean Journal of Chemical Engineering Vol.18 No.2
Ultrasonication method was employed for preparation of zirconia-pillared montmorillonite (Zr-PILC) by using polyhydroxy zirconium cation. The influences of various preparation parameters such as pH, concentration of pillaring agent, aging period on physico-chemical properties of Zr-PILCs are reported. The characterization was done by using different characterizing tools such as powder X-ray diffraction (XRD), thermal analysis (TG/DTA), Fourier transform infrared spectroscopy (FITR), X-ray photo-electron spectroscopy (XPS), X-ray fluorescence spectroscopy (XRF) and surface area measurements. Effective pillaring was obtained in the pH range 2.0-2.8 at reduced preparation time by using ultrasonication. Ultrasonication, especially at higher pH and concentration of pillaring agent with no aging after ultrasonic agitation of the clay slurry was found to increase zirconium content and specific BET surface area leaving no scope for remarkable increase in d001 spacing. The presence of -OH groups attached to Zr has been revealed by pyridine-adsorbed FTIR, TG/DTA and XPS techniques. The acidic character, ease of accessibility and good dispersion of active sites in Zr-PILC were found to be controlling factors for the challenging activity in hydroxylation reaction of phenol. Probably, this first report on the use of Zr-PILC in hydroxylation of phenol and its preparation by employing ultrasonication technique may attract great attention in the catalysis area of academic and industrial importance.