Int. J. of Nanomanufacturing   »   2013 Vol.9, No.3/4

 

 

Title: Preparation and thermal treatment of titania aerogels

 

Authors: Yong Kong; Xiaodong Shen; Sheng Cui

 

Addresses:
College of Material Science and Engineering, Nanjing University of Technology, Nanjing 210009, China
College of Material Science and Engineering, Nanjing University of Technology, Nanjing 210009, China
College of Material Science and Engineering, Nanjing University of Technology, Nanjing 210009, China

 

Abstract: TiO2 aerogels were prepared by sol-gel process and supercritical carbon dioxide drying. The influence of thermal treatment temperature on the crystalline structures and pore structures of TiO2 aerogels was investigated by X-ray diffraction and N2 adsorption-desorption. The results showed that the fresh prepared TiO2 aerogels were amorphous. After thermal treatment, the samples still possessed high surface areas and pore volumes, and the amorphous TiO2 gradually transforms to anatase and further to rutile. The crystallite sizes presented a persistent increase with the rise of temperature. The light absorption and the band gap of samples treated at different temperatures were also surveyed by diffuse reflection ultraviolet-visible (UV-vis) spectroscopy.

 

Keywords: titania aerogels; sol-gel process; supercritical drying; pore structure; ultraviolet visible; UV-vis spectroscopy; TiO2; thermal treatment temperature; nanotechnology.

 

DOI: 10.1504/IJNM.2013.056050

 

Int. J. of Nanomanufacturing, 2013 Vol.9, No.3/4, pp.253 - 260

 

Submission date: 01 Oct 2012
Date of acceptance: 08 Jan 2013
Available online: 29 Aug 2013

 

 

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