Linear versus Exponential Growth of Weak Polyelectrolyte Multilayers: Correlation with Polyelectrolyte Complexes
Linear versus Exponential Growth of Weak Polyelectrolyte Multilayers: Correlation with Polyelectrolyte Complexes
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DOI：
10.1021/ma300157p
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发表时间：
2012-04
期刊：
影响因子：
5.5
通讯作者：
Li Xu;D. Pristinski;A. Zhuk;C. Stoddart;J. Ankner;S. Sukhishvili
中科院分区：
文献类型：
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作者：
Li Xu;D. Pristinski;A. Zhuk;C. Stoddart;J. Ankner;S. Sukhishvili
报道了聚电解质复合体(PECs)中聚电解质链动力学与聚电解质(PES)在逐层组装(LBL)膜中的沉积方式和链迁移率之间的关系。研究采用两种聚电解质体系：聚(甲基丙烯酸二甲氨基乙酯)/聚甲基丙烯酸(PDMA/PMAA)和完全季节化的PDMA(Q100M)/PMAA。用荧光相关光谱(FCS)跟踪了PDMA/PMAA和Q100M/PMAA复合体在溶液中的流体力学尺寸，同时用三种不同的技术探索了相同PE对在LBL膜中的结构和动力学。具体而言，PES在表面的沉积通过相位调制椭偏仪、薄膜内部结构的中子反射仪(NR)和平行于衬底的组装链的扩散的荧光漂白恢复(FRAP)来监测。通过将这些互补技术应用于溶液中的PDMA/PMAA和Q100M/PMAA体系.
We report on the correlation of polyelectrolyte chain dynamics in polyelectrolyte complexes (PECs) with the deposition mode and chain mobility of polyelectrolytes (PEs) within layer-by-layer-assembled (LbL) films. The study was performed using two polyelectrolyte systems: poly(2-(dimethylamino)ethyl methacrylate)/poly(methacrylic acid) (PDMA/PMAA) and completely quaternized PDMA (Q100M)/PMAA. Hydrodynamic sizes of PDMA/PMAA and Q100M/PMAA complexes in solution were followed by fluorescence correlation spectroscopy (FCS), while three different techniques were applied to probe the structure and dynamics of the same PE pairs within LbL films. Specifically, deposition of PEs at surfaces was monitored by phase-modulated ellipsometry, film internal structure—by neutron reflectometry (NR), and diffusion of assembled chains in the direction parallel to the substrate—by fluorescence recovery after photobleaching (FRAP). By applying these complementary techniques to PDMA/PMAA and Q100M/PMAA systems in solution and ...