BUILDUP OF ULTRATHIN MULTILAYER FILMS BY A SELF-ASSEMBLY PROCESS .3. CONSECUTIVELY ALTERNATING ADSORPTION OF ANIONIC AND CATIONIC POLYELECTROLYTES ON CHARGED SURFACES
BUILDUP OF ULTRATHIN MULTILAYER FILMS BY A SELF-ASSEMBLY PROCESS .3. CONSECUTIVELY ALTERNATING ADSORPTION OF ANIONIC AND CATIONIC POLYELECTROLYTES ON CHARGED SURFACES
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DOI：
10.1016/0040-6090(92)90417-a
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发表时间：
1992-04-30
期刊：
影响因子：
2.1
通讯作者：
SCHMITT, J
中科院分区：
文献类型：
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作者：
DECHER, G;HONG, JD;SCHMITT, J
将具有带正电荷的平面表面的固体基底浸入含有阴离子阴离子的溶液中，并吸附聚阴离子的单层。由于吸附是在相对高浓度的Na 2SO 4下进行的，大量的离子残留物保持暴露于与溶液的界面，因此表面电荷被有效地反转。在纯水中冲洗后，将基材浸入含有阳离子染料的溶液中。同样，单层被吸附，但现在恢复了原始的表面电荷。通过以循环方式重复两个步骤，获得两种聚合物的交替多层组件。多层膜的建立之后，通过紫外/维斯光谱和小角X射线散射（SAXS）。它表明，多层膜组成的至少100个连续交替层可以组装。
A solid substrate with a positively charged planar surface is immersed in a solution containing an anionic polyelectrolyte and a monolayer of the polyanion is adsorbed. Since the adsorption is carried out at relatively high concentrations of polyelectrolyte, a large number of ionic residues remain exposed to the interface with the solution and thus the surface charge is effectively reversed. After rinsing in pure water the substrate is immersed in the solution containing a cationic polyelectrolyte. Again a monolayer is adsorbed but now the original surface charge is restored. By repeating both steps in a cyclic fashion, alternating multilayer assemblies of both polymers are obtained. The buildup of the multilayer films was followed by UV/vis spectroscopy and small angle X-ray scattering (SAXS). It is demonstrated that multilayer films composed of at least 100 consecutively alternating layers can be assembled.