In-Situ Microscopic Observation on Surface Kinetics in Optical Trapping-Induced Crystal Growth: Step Formation, Wetting Transition, and Non-Classical Growth
In-Situ Microscopic Observation on Surface Kinetics in Optical Trapping-Induced Crystal Growth: Step Formation, Wetting Transition, and Non-Classical Growth
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光捕获诱导晶体生长中表面动力学的原位显微观察：阶梯形成、润湿转变和非经典生长
DOI：
10.1021/acs.cgd.9b00600
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发表时间：
2019
影响因子：
3.8
通讯作者：
Satoshi Uda
中科院分区：
文献类型：
--
作者：
Hiromasa Niinomi;Teruki Sugiyama;Toru Ujihara;Suxia Guo;Jun Nozawa;Junpei Okada;Takashige Omatsu;Satoshi Uda
光学捕获诱导结晶(OTIC)对结晶的控制具有重要意义。虽然连续的研究表明，光在晶体表面形成的光学势能通过观察大块晶体的生长来促进晶体的生长，但从Burton、Cabrera和Frank理论等表面动力学的角度进行直接观察仍然是缺乏的。在这里，我们直接展示了表面状态的修饰，通过微观观察在开启/关闭激光照射时氯酸钠晶体表面的一层溶液薄层的形成/溶解和润湿转变。激光照射/停止对晶体的照射导致了几十微米大小的聚束台阶岛的形成/解离。实验还发现，溶液薄膜在整个晶体表面的润湿转变与激光同时发生，这证明了界面势通过光的传播从排斥势变为吸引势。此外，观测还可视化了非经典晶体的生长，如团簇同化情景。我们的观察不仅使我们对OTIC的机制有了更深入的了解，而且还提供了超越经典极限的异常晶体生长现象的机会，并对外场修正晶体生长具有重要意义。
Optical trapping-induced crystallization (OTIC) has provided significant impacts on the control of crystallization. Although consecutive research studies have implied that the optical potential formed on the crystalline surface by light propagation contributes to the crystal growth by observing bulk crystal growth, direct observation from the viewpoint of the surface kinetics represented as Burton, Cabrera, and Frank theory is still lacking. Here, we directly show the surface state modification by microscopically observing step formation/dissolution and wetting transition of a solution thin layer over a sodium chlorate crystalline surface upon turning on/off the laser irradiation. Irradiating/stopping of the laser irradiation to the crystal led to the formation/dissociation of several tens of micron-sized islands constructed by bunched steps. It was also found that the wetting transition of the solution thin film over the entire crystal surface took place simultaneously with the laser irradiation, evidencing that the interfacial potential was modified from repulsive to attractive potential by light propagation. Moreover, the observation visualized nonclassical crystal growth like the cluster assimilation scenario. Our observation not only leads to a deeper understanding of the mechanism of OTIC but also can provide the opportunity to reach unusual crystal growth phenomena beyond the classical limit and has implications for crystal growth modified by an external field.