聚苯乙烯磺酸钠/阿利新蓝分子沉积膜的表征及组装动力学

制备了聚苯乙烯磺酸钠/阿利新蓝分子沉积膜。紫外可见吸收光谱及接触角滴定的实验结果表明,聚苯乙烯磺酸钠/阿利新蓝分子沉积膜具有良好的自组装性能,且以单分子层层状沉积。通过时间控制,考察了聚苯乙烯磺酸钠/阿利新蓝分子组装形成分子沉积膜的动力学过程。结果表明,第8层阿利新蓝和第9层聚苯乙烯磺酸钠分子沉积膜润湿性稳定时间分别为18 min和25 min;聚苯乙烯磺酸钠的吸附速率常数比阿利新蓝的要小。依据不同组装时间的吸附动力学行为,提出了聚苯乙烯磺酸钠/阿利新蓝分子沉积膜在石英表面组装过程的动态模型。原子力显微镜和小角X射线衍射结果证实,多层聚苯乙烯磺酸钠/阿利新蓝分子沉积膜存在良好的层状周期结构,但层内局部结构有缺陷。

Characterization and adsorption kinetics of polysodium 4-styrenesulfonate/alcian blue molecular deposition films on quartz substrate

Polysodium 4-styrenesulfonate(PSS)/ alcian blue(AB) molecular deposition(MD) films on quartz substrate were prepared using layer by layer(LBL)deposition technique.The great variation of contact angle and UV-visible absorbance with deposition time indicate that PSS/AB MD films have perfect self-assembled property.The process of adsorption kinetics was studied by controlling the deposition time.The results show that for the eighth AB and the ninth PSS film,the time of adsorption equilibrium is 18 minutes and 25 minutes respectively.The adsorption kinetics rate constant for PSS is lower than that of AB.Depending on the adsorption kinetics behaviors with the time changing,a simple model of the self-assembling process was established.The results of atomic force microscopy and X-ray diffraction confirm that the PSS/AB MD films have good periodic structures as sandwich whose local structural defects exist in inner layers.