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Priprava stabilne vodne suspenzije ZnO = Preparation of stable aqueous suspension of ZnO
Degen, Andrej ; Kosec, Marija, 1947-2012
Namen dela je bila elektrostatska stabilizacija vodne suspenzije ZnO, kar je mogoče doseči s spreminjanjem pH-vrednosti suspenzije ter z dodatkom dispergenta. Uravnavanje pH suspenzije v območju od ...7,6 do 11,5 povzroči raztapljanje prahu ZnO in zniževanje nastavljenega pH zaradi vzpostavljanja ravnotežja med različnimi zvrstmi cinkovih ionov. Za elektrostatično stabilizacijo kovinskega oksida smo uporabili amonijevo sol poliakrilne kisline. Dodatek dispergenta povzroči znižanje viskoznosti sistema in povečanje zeta-potenciala delcev. Ob dodatku dispergenta lahko pripravimo suspenzijo s 50 vol. % oksida. Določili smo adsorpcijsko izotermo sistema ZnO-amonijev poliakrilat. Optimalen dodatek polielektrolita za pripravo stabilne suspenzije je bil 0,2 mas. %.
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