LINEAR GROWTH-RATES OF CALCIUM-SULFATE DIHYDRATE CRYSTALS IN THE PRESENCE OF ADDITIVES

被引：75
作者：
TADROS, ME
MAYES, I
机构：
[1] Martin Marietta Corporation, Martin Marietta Laboratories, Baltimore, MD 21227
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 1979年 / 72卷 / 02期
关键词：
D O I：
10.1016/0021-9797(79)90106-1
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The linear growth rates of CaSO4·2H2O crystals in the presence of carboxylic and phosphonic acid derivatives have been examined by optical microscopy. The crystals formed were of uniform shape and size. Application of Nielsen's chronomal (dimensionless time parameter) analysis demonstrated that growth follows second-order (in supersaturation) kinetics indicating a reactioncontrolled mechanism, polynuclear layer" growth. Crystals grown in the presence of additives exhibited habit modifications due primarily to inhibition of normal growth on the 111 faces of the CaSO4·2H2O crystals. Habit modification is explained on the basis of geometric factors relating the molecular structure of the additive to the crystal structure of gypsum. © 1979."
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页码：245 / 254
页数：10
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