ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 38, (1) 31 - 34 (1994)


SPECTROTURBIDIMETRIC STUDY OF PARTICLE SIZE DISTRIBUTION IN SiO₂ SOLS
 
Antalík Jozef 1, Liška Marek 2, Vavra Jozef 1
 
1 Department of Physical Chemistry, Slovak Technical University, Radlinského 9, 812 87 Bratislava
2 Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 842 36 Bratislava

For the study of particle size distribution in the SiO₂ sols, methods of a specific turbidity and turbidity ratios were applied. Distribution parameters of these polydispersions were searched by a numerical optimalization (SIMPLEX method). Our version of spectroturbility methods is presented for the distribution analysis of standard SiO₂ sol (Ludox) and for the granulometric description of a SiO₂ sol-gel transformation. The best estimates of distribution parameters of Ludox proved a certain degree of polydispersity with harmony to the electrone microscopy. In the aging proces in SiO₂ sols it was found that in the initial phases the breadth of particle size distribution increases, while for the later aging intervals this parameter does not change any more, only the size of aggregates increases.


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