Abstract
Synthesis of calcium hydroxide nanoparticles was done by chemical precipitation in aqueous medium at room temperature. Aqueous solution of calcium nitrate tetrahydrate (Ca(NO3)2·4H2O) and sodium hydroxide are used as precursor. The effect of rate of mixing of sodium hydroxide in calcium nitrate tetrahydrate was studied during the synthesis of calcium hydroxide. The prepared Ca(OH)2 powder was characterized by using UV–Vis spectroscopy, TGA and DTA, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM) and energy dispersive X-ray analysis (EDX). From the UV–Vis characterization, an increase in band gap from 4.3 eV to 5.8 eV with increase in mixing rate of sodium hydroxide in calcium nitrate tetrahydrate from 1 ml/min. to 5 ml/min was found respectively. The weight loss in TGA was also found to increase with increase in mixing rate. The change in weight loss and band gap with mixing rate was discussed in terms of growths during synthesis of calcium hydroxide.
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