Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States.
Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States; Department of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, United States.
J Colloid Interface Sci. 2017 Sep 15;502:165-171. doi: 10.1016/j.jcis.2017.04.091. Epub 2017 Apr 29.
In many applications of polyelectrolyte multilayers (PEMs), a base polycation layer is adsorbed to promote adhesion of the PEM to the substrate. In this report, the effect of the first polyelectrolyte adsorbed in a PEM was investigated by assembling PEMs with first layer polycations of different chemistries and molecular weights. In this study, quartz crystal microbalance with dissipation monitoring (QCM-D) was used to monitor the PEM assembly process. First layer choice affects the total mass accumulation of the PEM as well as the stoichiometry of the PEM, although linear growth was observed in all cases. PEM thickness was also affected by first layer choice, although not consistent with changes in mass. Combined with the stoichiometry results, these findings indicate that the structure of a PEM is fundamentally different depending on first layer chemistry and molecular weight. PEM topography is also affected by first layer choice. Selection of appropriate first layer material is therefore an important consideration in the design of a PEM, and changing first layer material may be a facile way to tailor the structure and properties of PEMs.
在聚电解质多层膜（PEM）的许多应用中，吸附基底聚阳离子层以促进 PEM 与基底的黏附。在本报告中，通过组装具有不同化学性质和分子量的第一层聚阳离子的 PEM 来研究 PEM 中第一层聚电解质的影响。在本研究中，使用石英晶体微天平耗散监测（QCM-D）监测 PEM 的组装过程。第一层的选择会影响 PEM 的总质量积累以及 PEM 的化学计量比，尽管在所有情况下都观察到线性增长。PEM 的厚度也受到第一层选择的影响，尽管与质量的变化不一致。结合化学计量比的结果，这些发现表明 PEM 的结构取决于第一层的化学性质和分子量。PEM 的形貌也受到第一层选择的影响。因此，选择合适的第一层材料是 PEM 设计中的一个重要考虑因素，改变第一层材料可能是调整 PEM 结构和性能的一种简单方法。
