Adsorption, Desorption, Surface Diffusion, Lattice Defect Formation, and Kink Incorporation Processes of Particles on Growth Interfaces of Colloidal Crystals with Attractive Interactions
Adsorption, Desorption, Surface Diffusion, Lattice Defect Formation, and Kink Incorporation Processes of Particles on Growth Interfaces of Colloidal Crystals with Attractive Interactions
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DOI：
10.3390/cryst6070080
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发表时间：
2016-07
期刊：
影响因子：
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通讯作者：
Yoshihisa Suzuki;Y. Hattori;J. Nozawa;S. Uda;A. Toyotama;J. Yamanaka
中科院分区：
文献类型：
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作者：
Yoshihisa Suzuki;Y. Hattori;J. Nozawa;S. Uda;A. Toyotama;J. Yamanaka
为了理解晶体生长过程，需要良好的模型系统，因为在许多情况下，原子或分子的精确掺入过程不能在原子或分子水平上容易地可视化。利用透射型光学显微镜，我们已经成功地观察到原位吸附，脱附，表面扩散，晶格缺陷的形成，并在聚丙烯酸钠水溶液中的聚苯乙烯颗粒的胶体晶体的生长界面上的颗粒扭结纳入。精确的表面运输和扭结纳入过程中的粒子到胶体晶体的吸引力的相互作用，观察在原位的颗粒水平。特别是，与传统的预期相反，颗粒的扩散沿着步骤周围的二维岛的生长界面是不是扭结纳入的主要途径。这可能是由于吸附颗粒和晶体中颗粒之间的键数;该键数超过了一个颗粒容易沿台阶沿着与相邻颗粒交换位置的极限。我们还发现了新的解吸过程中的颗粒从步骤梯田，归因于他们的援助的吸引力从另外吸附颗粒的颗粒上的步骤。
Good model systems are required in order to understand crystal growth processes because, in many cases, precise incorporation processes of atoms or molecules cannot be visualized easily at the atomic or molecular level. Using a transmission-type optical microscope, we have successfully observed in situ adsorption, desorption, surface diffusion, lattice defect formation, and kink incorporation of particles on growth interfaces of colloidal crystals of polystyrene particles in aqueous sodium polyacrylate solutions. Precise surface transportation and kink incorporation processes of the particles into the colloidal crystals with attractive interactions were observed in situ at the particle level. In particular, contrary to the conventional expectations, the diffusion of particles along steps around a two-dimensional island of the growth interface was not the main route for kink incorporation. This is probably due to the number of bonds between adsorbed particles and particles in a crystal; the number exceeds the limit at which a particle easily exchanges its position to the adjacent one along the step. We also found novel desorption processes of particles from steps to terraces, attributing them to the assistance of attractive forces from additionally adsorbing particles to the particles on the steps.