流动场对膜层层组装过程的影响

分别在层层组装膜的沉积和淋洗步骤中引入流动场, 用紫外-可见光谱对多层膜的组装过程进行了跟踪, 用原子力显微镜对膜的表面粗糙度进行了观察, 用X射线反射(XRR)对膜的厚度和粗糙度进行了评估. 实验结果表明, 在沉积步骤中, 流动场可以促进高分子与组装基底的接触, 从而提升组装速度; 而在淋洗步骤中, 搅拌下的流动场不仅可以冲洗掉膜表面物理吸附的高分子, 还能够降低膜的粗糙度, 使得膜表面更加平整.

Effect of Stirring on Layer-by-layer Assembly Films in Different Stages

We explored the effect of flow field under stirring on layer-by-layer(LbL) assembly films in different stages. The agitation was respectively introduced in the deposition and rinsing stages, then we designed an orthogonal experiment in which the deposition stage and rinsing stage were set as the two elements and agitation and still standing were set as the two standards. Afterwards, UV-Vis spectroscopy was used to track the assembly process, atomic force mircroscope(AFM) was used to observe the surface roughness of the film, and X-ray reflection(XRR) was used to estimate the thickness and surface roughness of the film. The results show that flow field could accelerate the contact between the polymer and the substrate to promote the assembly speed in deposition stage, while flow field produced more strong flushing action to smooth the film surface in rinsing stage. This study has indicated the important role that the rinsing stage plays in the LbL assembly and provides new strategy to rapidly fabricate thin films and to adjust film structures.