Bormashenko Edward, Pogreb Roman, Musin Albina, Stanevsky Oleg, Bormashenko Yelena, Whyman Gene, Gendelman Oleg, Barkay Zahava
The College of Judea and Samaria, The Research Institute, 44837 Ariel, Israel.
J Colloid Interface Sci. 2006 May 15;297(2):534-40. doi: 10.1016/j.jcis.2005.11.025. Epub 2005 Dec 20.
Amorphous polymers were dissolved in chlorinated organic solvents and deposited on thin horizontal substrates. The solutions with various concentrations of polymers were deposited and evaporated under ambient conditions in a slow air current. Self-assembled oriented mesoscopically scaled patterns were observed. The patterns were studied with optical and atomic force microscopy. The concentration of the solution exerts a decisive influence on the mesoscopic cell characteristic dimension. Cell dimensions grow linearly with the polymer solution concentration for all kinds of tested polymers, chlorinated solvents and substrates. The dependence could be explained by a physical mechanism, based on the mass transport instability occurring under the intensive evaporation of the solvent. In situ FTIR study of the process was performed first. It was established with FTIR spectroscopy that film porosity is not due to water droplet condensation under evaporation.
无定形聚合物溶解于氯化有机溶剂中，并沉积在水平放置的薄基底上。将含有不同聚合物浓度的溶液在环境条件下、缓慢气流中进行沉积和蒸发。观察到了自组装的介观尺度取向图案。用光学显微镜和原子力显微镜对这些图案进行了研究。溶液浓度对介观单元的特征尺寸有决定性影响。对于所有测试的聚合物、氯化溶剂和基底，单元尺寸随聚合物溶液浓度呈线性增长。这种依赖性可以用一种物理机制来解释，该机制基于溶剂强烈蒸发时发生的质量传输不稳定性。首先对该过程进行了原位傅里叶变换红外光谱（FTIR）研究。通过FTIR光谱确定，薄膜孔隙率并非由于蒸发过程中的水滴凝结所致。
