PREPARATION AND CHARACTERIZATION OF ALCOHOLIC COLLOIDAL DISPERSION OF STRONTIUM HYDROXIDE

In the field of inorganic protective substances of porous calcareous materials alternatives to nanolime[1], [2] the alcoholic dispersion of colloidal strontium hydroxide may show some effectiveness[3], [4] due to the peculiar chemical-physical features and compatibility with the crystal structure of calcareous. In this work the development of a rapid (about 6h) "bottom-up" procedure of the dispersion has been realized. The colloidal particles have an average diameter of 200 nm and PdI (Poly dispersion Index) is equal to 0.144 (mono-disperse). The colloidal particles show a good kinetic stability (600 nm) with a zeta potential of +28mV. Tests conducted in the laboratory on a glass slide show that the transformation of strontium hydroxide into the corresponding carbonate, in air and under controlled humidity and temperature conditions (21°C, 51% R.H.), is complete in 8~10 days. The characterization is performed by powder X-Ray Diffraction[5] and Dynamic Light Scattering (D.L.S.)[6].