Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, People's Republic of China.
Langmuir. 2012 Mar 6;28(9):4160-7. doi: 10.1021/la205111v. Epub 2012 Feb 22.
Real-time monitoring of the binary colloidal crystal (bCC) growth via evaporation-induced cooperative self-assembly (EICSA) was studied by an in situ optical microspectroscopy technique. Evolution of the recorded reflectance spectra reveals that the whole growth process of bCCs via EICSA could be separated into three different stages corresponding to that of unary colloidal crystals because of the same evaporation model. We show the detailed cooperative self-assembly information, including the evolution of the number of layers and filling factors of different components of the growing bCCs using the scalar wave approximation method. Furthermore, when the size ratio and number ratio of the two colloids were varied, the real-time optical properties of the bCCs with various stoichiometric configurations were investigated systematically. This study would be valuable in furthering the current understanding of the bCC growth dynamics via EICSA and tailoring optical properties of hierarchical materials for applications in many fields.
通过原位光学微光谱技术研究了蒸发诱导协同自组装（EICSA）过程中二元胶体晶体（bCC）的实时监测。记录的反射率光谱的演化表明，由于相同的蒸发模型，bCC 通过 EICSA 的整个生长过程可以分为三个不同的阶段，对应于一元胶体晶体。我们使用标量波近似方法展示了详细的协同自组装信息，包括不同成分的生长 bCC 的层数和填充因子的演变。此外，当两种胶体的大小比和数量比发生变化时，我们系统地研究了具有各种化学计量构型的 bCC 的实时光学性质。这项研究对于进一步了解通过 EICSA 的 bCC 生长动力学以及为许多领域的应用定制分级材料的光学性质将具有重要意义。
