结构生色SiO_2多层膜的静电自组装法构造

Electrostatic self-assembly fabrication of SiO_2 multilayer films with structural color

以聚乙烯亚胺(PEI)溶液和SiO2溶胶为前驱体,采用静电自组装法构造结构生色多层膜。研究了基板材质、提拉速率和PEI前驱液浓度对组装多层膜的影响。结果表明,表面负电性高、亲水性大、粗糙度小的基板上SiO2粒子分布较为均匀,形成的多层膜颜色均匀性较好;提拉速率为1.27 cm/s,PEI质量分数为0.5%时,SiO2粒子能相对均匀地分布在基板上。以此为条件,在PET基板上构造SiO2多层膜,不同周期数的多层膜呈现不同的颜色,且同一多层膜的颜色随观察角度的变化而变化。

With the precursors of polyethyleneimine （PEI） and SiOz colloidal solution, the multilayer films are fabricated by electrostatic self-assembly method. The factors exerting influence on films are discussed, such as the different substrates, the lifting velocity and the concentration of PEI. The results show that the substrate surface with high electronegativity, high hydrophilicity and low roughness is beneficial to uniform dispersion of SiO2 particles and uniform structural color formation; SiO2 particles are homogeneously distributed on substrate when the lifting velocity is 1.27 cm/s and the concentration of PEI is 0.5%. The multilayer films with different periods demonstrate various structural colors, and the distinct colors are observed as the change of viewpoint.