Das, Shyamal and Roy, Sudipta and Patra, Amitava and Biswas, Prasanta Kumar (2003) Study of refractive index and physical thickness of porous silica films with ageing in hydrated ammonia and air. Materials Letters, 57 (15). pp. 2320-2325. ISSN 0167-577X

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Colloidal silica sol-based porous films were deposited onto circular glass disc of soda lime silica by the spinning technique (RPM range, 3500-5500) and cured in air and hydrated ammonia atmospheres at ambient temperature for about 20 days. In both cases, the film shrinkage with time was observed initially, followed by little swelling and compression on further ageing the films. These observations were reflected in the evaluated physical thickness and R.I. values. The porosity of the films was in accordance to their R.I. values. The stretching frequency due to -OH group of chemisorbed hydrated ammonia changed significantly with ageing of the films. (C) 2002 Elsevier Science B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Optical constants; Sol-gel; Porous silica film; Colloidal sol
Subjects: Engineering Materials
Divisions: Sol Gel
Depositing User: Subhra Lahiri
Date Deposited: 16 Feb 2012 05:55
Last Modified: 23 Nov 2012 10:46
URI: http://cgcri.csircentral.net/id/eprint/861

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