Sol-gel preparation of dicalcium silicate glasses

Goo, Choi Nyuk (2008) Sol-gel preparation of dicalcium silicate glasses. Universiti Malaysia Sabah. (Unpublished)

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Abstract

In the past few decades, sol-gel technology was widely used in industrial and their applications are numerous and diverse. Meanwhile, dicalcium silicate is one of the major components in the Portland cement clinker which recently found that have great potential in new biomaterials to regenerate damaged bone. This paper mainly study on sol-gel synthesis of dicalcium silicate at lower temperature, than normal used. Glass powders of dicalcium silicate were prepared from TEOS and calcium nitrate tetrahydrate in present of HCI as catalyst and ethyl alcohol to speed up the polycondensation process. Acidic condition will favor the hydrolysis reaction instead of alkaline condition. Gel was sintering at different temperature in which 400°C, 600°C, 800°C and 1000°C. The combination of techniques involving TGA, FT-IR, and SEM has been used to recognize all the transformation occurring in the processing which involved hydrolysis and condensation polymerization and the formation of the final product. From the above analyze, result shown there are about 70% weights lost occur in elastic gel due to the elimination of unwanted compounds like water and organic residual such as nitrate. This outcome was indicated by the TGA thermal treatment curve in the temperature range from 20-700°C. Then, the FTIR spectra suggested that formation of the ordered Si tetrahedral in dicalcium silicate was started at temperature below 600°C. The glass powders that sintering at temperature 1000°C for 4 hours give a fine spherical crystallites in range of 1.2-1.9μm. As a conclusion, the route of sol-gel method is successfully applied in the preparation of dicalcium silicate glass.

Item Type: Academic Exercise
Uncontrolled Keywords: sol-gel technology, dicalcium silicate, Portland cement clinker, temperature, HCI
Subjects: T Technology > TP Chemical technology
Divisions: SCHOOL > School of Science and Technology
Depositing User: MDM SITI AZIZAH IDRIS
Date Deposited: 12 Mar 2014 08:36
Last Modified: 12 Oct 2017 06:15
URI: http://eprints.ums.edu.my/id/eprint/8472

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