Kink Distance and Binding Energy of Colloidal Crystals
Kink Distance and Binding Energy of Colloidal Crystals
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DOI：
10.1021/acs.cgd.8b00942
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发表时间：
2018-09
影响因子：
3.8
通讯作者：
J. Nozawa;S. Uda;Suxia Guo;A. Toyotama;J. Yamanaka;N. Ihara;J. Okada
中科院分区：
文献类型：
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作者：
J. Nozawa;S. Uda;Suxia Guo;A. Toyotama;J. Yamanaka;N. Ihara;J. Okada
粒子间的相互作用是胶体晶体生长动力学的一个重要参数。平衡浓度和阶跃自由能与粒子相互作用密切相关。胶体晶体的吸引系统的生长机制类似于蒸汽或溶液的生长，其中晶体的生长是通过将台阶上的扩散颗粒结合成台阶的扭结（台阶-台阶-扭结模型）。在这里，我们应用晶体生长理论来实验确定由粒子相互作用产生的结合能。我们重点研究了用BCF （Burton-Cabrera-Frank）理论描述的扭结距离与键能之间的关系。由扭结距离测量得到的阶跃自由能值与其他测量得到的值（包括成核速率和临界半径）吻合得很好。得到的值也很好地解释了二维岛屿阶跃速度的变化，这是由于吉布斯-汤姆逊效应。
Particle interaction is a critical parameter for growth kinetics of colloidal crystals. The equilibrium concentration and step free energy are strongly dependent on the particle interaction. The growth mechanism of the attractive system of colloidal crystals is similar to that of vapor or solution growth, where crystals grow by incorporating diffusing ad-particles on the terrace into kinks of steps (Terrace-Step-Kink model). Here, we have applied the theory of crystal growth to experimentally determine the binding energy that originates from the particle interaction. We focus on the relationship between kink distance and bond energy, which is described by BCF (Burton-Cabrera-Frank) theory. The value of the step free energy determined by the kink distance measurement agrees well with the values obtained from other measurements, including nucleation rate and critical radius. The obtained value also accounts well for the change in step velocity of two-dimensional islands, which is due to the Gibbs–Thomson ef...