An ultra-low hydrolysis sol-gel route for titanosilicate xerogels and their characterization |
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Authors: | Toney Fernandez Gijo Jose Siby Mathew Rejikumar PR Unnikrishnan NV |
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Institution: | (1) School of Pure & Applied Physics, Mahatma Gandhi University, Kottayam, Kerala, 686560, India |
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Abstract: | In this work TiO2-SiO2 xerogels were prepared through an ultra low hydrolysis method using titanium and silicon alkoxide. The samples were heat
treated to 500°C. The xerogels were characterized using TGA/DTA, FTIR, XRD and TEM. The samples showed the formation of Si–O–Ti
bridges by its characteristic vibration within 925–960 cm−1 range. Si–O–Si bond angles were calculated using the central force network model. The TiO2 in all the samples crystallized on heat treatment to 500°C. The crystallite size calculated using the Scherer formula from
the XRD was verified from the Transmission Electron Micrograph. Samples heat treated to 350°C remained amorphous and hence
could be used as hosts for biomaterials and organic optical materials. |
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Keywords: | SiO2– TiO2 Xerogels Sol-gel process TiO2 nanocrystals |
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