Roles of chain conformation and interpenetration in the growth of a polyelectrolyte multilayer
Roles of chain conformation and interpenetration in the growth of a polyelectrolyte multilayer
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DOI：
10.1021/jp077286f
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发表时间：
2008-04-10
影响因子：
3.3
通讯作者：
Zhang, Guangzhao
中科院分区：
文献类型：
--
作者：
Liu, Guangming;Zou, Sirui;Zhang, Guangzhao
本文利用石英晶体微天平（QCM-D）研究了聚对苯乙烯磺酸钠（PSSS）和聚二甲基二烯丙基氯化铵（PDDA）在不同盐浓度下形成的多层膜的生长。频率变化（Δ f）表明，随着NaCl浓度（C-NaCl）的增加，指数生长模式逐渐占主导地位。另一方面，耗散变化（AD）表明，在C-NaCl < 1.0 M时，沉积以链状构象为主，特征生长参数的变化与德拜长度拟合的结果一致。在C-NaCl >= 1.0 M时，链的增长不是由链构象决定的，而是由链的相互渗透决定的。
In the present study, we have investigated the growth of a multilayer formed by poly(sodiurn 4-styrene sulfonate) (PSSS) and poly(diallyldimethylammonium chloride) (PDDA) at different salt concentrations by use of quartz crystal microbalance with dissipation (QCM-D). The frequency change (Delta f) demonstrates that the exponential growth mode gradually becomes dominant as NaCl concentration (C-NaCl) increases. On the other hand, the dissipation change (AD) reveals that the deposition is dominated by chain conformation at C-NaCl < 1.0 M, where the change of the characteristic growth parameter agrees well with the results fit with Debye length. At C-NaCl >= 1.0 M, the growth is not determined by chain conformation but by chain interpenetration.