Kinetics of salt-induced annealing of a polyelectrolyte multilayer film morphology
Kinetics of salt-induced annealing of a polyelectrolyte multilayer film morphology
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DOI：
10.1021/la026882s
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发表时间：
2003-04-29
期刊：
影响因子：
3.9
通讯作者：
Goh, MC
中科院分区：
文献类型：
--
作者：
McAloney, RA;Dudnik, V;Goh, MC
从水溶液中逐层（LBL）吸附聚电解质到带电表面产生多层表面结构。用1.0 M NaCl在聚合物溶液中制备聚二烯基二甲基氯化铵（PDDA）和聚苯乙烯磺酸钠盐（PSS）多层膜，其形貌为蠕虫状，粗糙度大于30 nm。原子力显微镜（AFM）研究表明，通过引入不同浓度的盐溶液，薄膜的形貌可以退火。浸泡在盐溶液中不同时间的粗糙度测量表明，表面粗糙度的降低与二级动力学一致。提出了一个模型来解释依赖于盐离子的存在释放聚合物-聚合物接触，允许新接触形成的形态退火。新的聚合物-聚合物接触的形成导致了新的薄膜形态。
The layer-by-layer (LBL) adsorption of polyelectrolytes onto charged surfaces from aqueous solutions produces multilayered surface structures. A multilayer film of polydiallyldimethylammonium chloride (PDDA) and polystyrenesulfonic acid, sodium salt (PSS), prepared using 1.0 M NaCl in the polymer solutions, has a vermiculate morphology with roughness greater than 30 nm. Atomic force microscopy (AFM) investigations show that the morphology of the films can be annealed by the introduction of salt solutions of various concentrations. Roughness measurements taken at various times after immersion in salt solution indicate that the decrease in surface roughness is consistent with second-order kinetics. A model is proposed to explain the morphology annealing that relies on the presence of salt ions that free up polymer-polymer contacts, allowing new ones to form. The formation of new polymer-polymer contacts results in a new film morphology.