CRYSTALLIZATION OF CALCIUM CARBONATE .2. CALCITE GROWTH MECHANISM
CRYSTALLIZATION OF CALCIUM CARBONATE .2. CALCITE GROWTH MECHANISM
复制标题
DOI：
10.1016/0021-9797(71)90363-8
复制
发表时间：
1971-01-01
影响因子：
9.9
通讯作者：
REDDY, MM
中科院分区：
文献类型：
--
作者：
NANCOLLAS, GH;REDDY, MM
通过仔细控制实验条件，在10、25和40°C下制备了稳定的碳酸钙过饱和溶液。在添加方解石晶种后，通过监测钙离子和氢离子浓度来跟踪结晶动力学。在初始生长激增之后，该过程遵循先前建立的动力学方程，其中结晶速率与浓度的乘积[Ca+2][CO3−2]成比例。晶体生长的活化能为11.0 ± 1.0 kcal mole−1，速率与搅拌速率无关。显微照片的证据是支持的建议，即在生长曲线的初始激增的结果从额外的成核在表面的添加的方解石晶体和在大部分的过饱和溶液。
Stable supersaturated solutions of calcium carbonate have been prepared at 10, 25, and 40°C by careful control of experimental conditions. Upon the addition of seed crystals of calcite, the crystallization kinetics have been followed by monitoring the calcium and hydrogen ion concentrations. After an initial growth surge, the process follows the kinetic equation established previously in which the rate of crystallization is proportional to the product of the concentrations, [Ca+2][CO3−2]. The activation energy for crystal growth is 11.0 ± 1.0 kcal mole−1, and the rate is independent of the stirring rate. Photomicrographic evidence is presented in support of the suggestion that the initial surge in the growth curves results from additional nucleation at the surface of the added calcite crystals and in the bulk of the supersaturated solution.