Visco-elastic and adhesive properties of adsorbed polyelectrolyte multilayers determined in situ with QCM-D and AFM measurements.
Visco-elastic and adhesive properties of adsorbed polyelectrolyte multilayers determined in situ with QCM-D and AFM measurements.
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DOI：
10.1016/j.jcis.2005.05.057
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发表时间：
2005-12
影响因子：
9.9
通讯作者：
S. Notley;Malin Eriksson;L. Wågberg
中科院分区：
文献类型：
--
作者：
S. Notley;Malin Eriksson;L. Wågberg
用耗散石英晶体微天平连续监测了聚烯丙基胺盐酸盐(PAH)和聚丙烯酸(PAA)在不同pH条件下形成的多层膜。测定了聚合物的吸附量和偶联水的量。此外，通过耗散测量，可以确定吸附的多层膜的粘弹性性质。这些性质高度依赖于存在于最外层的聚电解质。以PAA为最外层的多层膜具有更大的刚性和弹性。此外，还建立了多层覆盖表面的一致性或刚性与这些表面之间的附着力之间的联系。使用原子力显微镜进行的附着力测量表明，当粘性更强的多环芳烃存在于最外层时，拉断力更大。
The build-up of multilayers constructed from polyallylamine hydrochloride (PAH) and polyacrylic acid (PAA) under different pH conditions was continuously monitored using the quartz crystal microbalance with dissipation. The adsorbed amount of polymer as well as the amount of coupled water was determined. Furthermore, from dissipation measurements, it was possible to determine the visco-elastic properties of the adsorbed multilayer. These properties were highly dependent on the polyelectrolyte present in the outermost layer. The multilayer was far more rigid and elastic with PAA as the outermost layer. Furthermore, a link has been established between the conformability or rigidity of a multilayer covered surface and the adhesion between such surfaces. Adhesion measurements using the atomic force microscope showed a greater pull-off force when the more viscous PAH was present in the outermost layer.