Ripening of calcium carbonate powders in low surface tension liquidsстатья
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Дата последнего поиска статьи во внешних источниках: 26 августа 2016 г.
Аннотация:We have studied the ripening of calcium carbonate powders in a mother liquor for up to 18 days in relation to the content of different liquids having lower surface tension in comparison with water: dimethyl ketone, ethanol, and ethanolamine. As a result of ripening, we obtained nanopowders among which the largest specific surface area, up to 85 m(2)/g, was offered by the powders prepared from solutions containing ethanolamine. Their small particle size is due to the formation of an amorphous phase, about 69 wt %, and nanocrystalline vaterite with the smallest crystallite size, about 19 nm. The decrease in particle size and the associated increase in S are contributed by the low surface tension of ethanolamine: in combination with its high viscosity, this leads to the formation of powders consisting of unstable, loose aggregates.