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首页> 外文期刊>Journal of Crystal Growth >Face-by-face growth of sucrose crystals from aqueous solutions in the presence of raffinose. I. Experiments and kinetic-adsorption model
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Face-by-face growth of sucrose crystals from aqueous solutions in the presence of raffinose. I. Experiments and kinetic-adsorption model

机译：在存在棉子糖的情况下，水溶液中蔗糖晶体的面对面生长。一，实验与动力学吸附模型

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摘要

Experimental growth kinetics of {100}, {10 (1) over bar}, {110} and {(1) over bar(1) over bar0}, the four most important F (flat) forms of sucrose crystal, has been investigated within a range of low supersaturations (0.040 <= sigma <= 0.080) and under varying raffinose concentrations (0.0 <= C-raff <= 8.0% H2O). The comparison with growth isotherms determined in pure solution confirms that raffinose dramatically slows down the growth rates of the first three forms, which still go on growing by the screw dislocation mechanism. Further, dead zones occur for both the {10 (1) over bar} and {110} forms. On the contrary the {(1) over bar(1) over bar0} form is weakly affected, at least up to C-raff approximate to 3% H2O, owing to the low structural compatibility between its surface sites and the adsorbed raffinose molecules. Both Cabrera-Vermilyea and Kubota-Mullin models, associated with Langmuir-type equilibrium isotherms, are tested to find the more suitable description of the kinetic behaviour in the presence of raffinose. The Kubota-Mullin model resulting the better one, we concluded that adsorption occurs at kink sites of all the interested forms. The predictive power of alpha(hk1), the effectiveness coefficient of this model, is outlined as well. Finally, the disagreements between the model predictions and the experimental behaviour of the {100} form are attributed to the peculiar structure of its surface. (c) 2006 Elsevier B.V. All rights reserved.
机译：研究了{100}，{10（1）超过bar}，{110}和{（1）超过bar（1）超过bar0}（蔗糖晶体的四种最重要的F（扁平）形式）的实验生长动力学在低过饱和度（0.040 <= sigma <= 0.080）的范围内，以及在变化的棉子糖浓度下（0.0 <= C-raff <= 8.0％H2O）。与纯溶液中确定的生长等温线的比较证实，棉子糖显着减慢了前三种形式的生长速度，前三种形式仍通过螺旋位错机制继续生长。此外，{10（1）over bar}和{110}形式均出现盲区。相反，{（1）over bar（1）over bar0}的形式受到的影响很小，至少由于C-raff的表面位置与吸附的棉子糖分子之间的结构相容性低，至少达到大约3％H2O的C-raff。 Cabrera-Vermilyea模型和Kubota-Mullin模型均与Langmuir型平衡等温线相关联，均经过测试以找到在存在棉子糖时动力学行为的更合适描述。 Kubota-Mullin模型得到的结果更好，我们得出结论，吸附发生在所有感兴趣形式的扭结位点。还概述了该模型的有效性系数alpha（hk1）的预测能力。最后，{100}形式的模型预测与实验行为之间的分歧归因于其表面的特殊结构。 （c）2006 Elsevier B.V.保留所有权利。

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