Effect of Impurities on the Growth Kinetics of Crystals

Abstract

This paper reviews the work made by the group of the present author on the effect of impurities on the kinetics of crystal growth in solutions. The impurity effect is here discussed in the light of the model proposed by Kubota and Mullin [J. Crystal Growth, 152 (1995) 86], in which impurities are assumed to be adsorbed on the step lines at kink sites following the Langmuir mechanisms for inhibition of step displacement with a modified pinning mechanism. Effects of impurity concentration and supersaturation on impurity action on crystal growth are discussed successfully for various crystallizing systems with different impurities. Temperature effect on the impurity action is also discussed. Non‐steady as well as steady state crystal growth behavior in the presence of impurities is discussed. Growth rate hysteresis in the presence of impurities and the pH effect on the impurity action of trivalent metallic impurities are discussed as well.

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

“…De Villeneuve et al (2005) reported that impurities could influence the nucleation, growth, and structure of crystals. Kubota (2001) also addressed that crystal growth is markedly affected by the impurities presented in the system. Our observational results are also in agreement with our previous study .…”

Кинетика Роста Нитевидных Кристаллов KH-=SUB=-2-=/SUB=-PO-=SUB=-4-=/SUB=- На Затравочном Кристалле

“…Тем не менее на гранях бипирамиды двумерные заро-дыши образуются также при пересыщении ниже крити-ческого, но их распространение невозможно, поскольку здесь критический размер зародыша больше, чем рас-стояние между прочно адсорбированными примесями -так называемыми стопорами Кабреры и Вермили [9] или Куботы и Маллина [10]. В [9] рассматривается образование стопоров на террасах, а в [10] -на сту-пенях.…”

Biomimetic Polymers for Chiral Resolution and Antifreeze Applications

“…[120][121] The additives are usually adsorbed onto specific crystal faces in a certain way that disrupts their continuous growth, and as a result these crystals faces grew in size. Morphological changes caused by additives that are similar in structure can be divided into two major cases, the inclusion of a 'disrupter' guest molecule or the inclusion of a 'blocker' guest molecule on the growing host crystal.…”