Nanostructure of a "carpet"-like dense layer/polyelectrolyte brush layer in a block copolymer monolayer at the air-water interface.
Nanostructure of a "carpet"-like dense layer/polyelectrolyte brush layer in a block copolymer monolayer at the air-water interface.
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DOI：
10.1021/la040028e
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发表时间：
2005-03
期刊：
影响因子：
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通讯作者：
E. Mouri;Kozo Matsumoto;H. Matsuoka;N. Torikai
中科院分区：
文献类型：
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作者：
E. Mouri;Kozo Matsumoto;H. Matsuoka;N. Torikai
用原位中子反射法和X射线反射率法定量研究了两亲嵌段共聚物单分子膜气-水界面聚电解质层中的“地毯”/刷子双层结构。由于聚电解质[聚甲基丙烯酸]和中子溶剂(D(2O)O)之间的对比度较高，因此可以更准确地估计刷子结构作为表面压力的函数，即刷子密度。地毯层的厚度被认为是为了降低水和疏水层之间的界面自由能而形成的，在所研究的任何表面压力下，地毯层的厚度在10-20A几乎是恒定的。随着表面压力的增加，在整个刷子长度内观察到明显的生长，估计大约是离子聚合物链全长的60%。此外，通过对比中子和X射线反射仪的密度分布，提出了异常水化。
The "carpet"/brush double layer structure in the polyelectrolyte layer in the amphiphilic diblock copolymer monolayer at the air-water interface was quantitatively studied by in situ neutron reflectometry in addition to X-ray reflectivity measurements. As a result of the higher contrast between polyelectrolyte [poly(methacrylic acid)] and solvent (D(2)O) for the neutron, the brush structure could be estimated more accurately as a function of surface pressure, that is, brush density. The thickness of the carpet layer, which is thought to be formed to reduce the interfacial free energy between water and the hydrophobic layer, was almost constant at 10-20 A at any surface pressure studied. Growth was clearly observed in the whole brush length with increasing surface pressure, and it was estimated to be almost 60% of the full-stretch length of the ionic polymer chain. Furthermore, by the comparison of density profiles by neutron and X-ray reflectometry, an anomalous hydration was suggested.