PREPARATION AND PHYSICOCHEMICAL PROPERTIES OF HYDRATED OXIDES SOLS .2. ALUMINA SOL

Hydrated alumina sol was prepared by using the electro-chemical method. In the course of synthesis pH and electric conductance of the solution was non-linear changes. By NMR Al-27 was observed the concentration change of Al1, Al2, Al13, Al(x) in the process. it was shown that some quantity of aluminium contained in the solution in polynuclear form; that could not be registered by the method. But it had a great importance in sol formation. Properties of sols and xerosols were investigated by different physico - chemical methods. It was shown that particle growth in the sol had been not more than 2-3 nm. By electronic microscopy particles were found about 50 nm and some aggregates up to 1000 nm. Vacuumation and drying of the sol by normal temperature caused essential changes in their structure and morphology.