研究目的
To propose a simple strategy of separation-cooperated assembly (SCA) to prepare photonic crystals (PCs) with narrow stopbands from cheap polydisperse particles.
研究成果
The SCA strategy is a useful method to ease the production of photonic crystals (PCs) from cheap polydisperse particles. The obtained liquid PCs with narrow stopbands are assembly-reversible at a cycling time down to 20 s, and they remain ordered after drying, making them practicable to write and paint directly with liquid PCs. Furthermore, the assembly yields highly homogenized particles in the separated zones, opening a new convenient route to produce uniform particles.
研究不足
The study mentions that the selection of an appropriate solvent is a key, and the assembling time is mainly determined by the suspension solvent(s) and species of particle. The particle concentration should be kept below 12% (v/v) to afford a sufficient production of PCs.
1：Experimental Design and Method Selection:
The study employed a separation-cooperated assembly (SCA) strategy to organize polydisperse particles into photonic crystals (PCs). The method combines self-assembly and separation of particles in a gravitational field.
2：Sample Selection and Data Sources:
Various Gaussian particles were chemically synthesized, such as SiO2, Fe3O4, TiO2, and ZnO. Physically mixed silica particles were also prepared to enlarge the coefficient of variation (CV) in size.
3：List of Experimental Equipment and Materials:
The study used silica particles with size variation up to 56%, and hydroxyl-containing solvents like water, methanol, and ethanol for suspension.
4：Experimental Procedures and Operational Workflow:
The assembly was realized by gravity- or sinking-induced SCA of Gaussian-distributed particles. The selection of suspension solvent, particle concentration, and assembling time were found to be critical.
5：Data Analysis Methods:
The quality of the assembled PCs was analyzed through optical reflection spectra and TEM images.
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