A Crystallographic Study on the Deactivation Temperature of Crystal Nucleating Agents for Supercooled Sodium Acetate Trihydrate
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The present paper reports a study on the relation between the deactivation temperatures of five nucleating agents for supercooled NaCH<SUB>3</SUB>COO·3H<SUB>2</SUB>O and crystallographic matching on a point of view of the arrangement of Na atoms. The deactivation temperatures of Na<SUB>2</SUB>SO<SUB>4</SUB>, NaCl, NaBr, Na<SUB>2</SUB>HPO<SUB>4</SUB>·2H<SUB>2</SUB>O, and Na<SUB>3</SUB>PO<SUB>4</SUB>·0.5H<SUB>2</SUB>O were 333, 335, 339, 348, and 360 K, respectively. The crystal structural correlation between NaCH<SUB>3</SUB>COO·3H<SUB>2</SUB>O and five nucleating agents was studied from the point of view of the arrangement of Na atoms in a crystal face slice. Periodic matching of a pair of Na atoms was observed in the area of 200–400 square Å. The degrees of matching, defined as a reciprocal of the number of unit cells which were contained in a parallelogram with four matching points, of above five nucleating agents were 1.0, 1.9, 5.0, 20, and 25%, respectively. A positive correlation between the deactivation temperatures and the crystallographic matching was found.
- JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 40(1), 36-43, 2007-01-01
The Society of Chemical Engineers, Japan