Effects of Charge Density on Spread Hyperbranched Polyelectrolyte/Surfactant Films at the Air/Water Interface.
Effects of Charge Density on Spread Hyperbranched Polyelectrolyte/Surfactant Films at the Air/Water Interface.
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DOI：
10.1021/acs.langmuir.3c01514
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发表时间：
2023-10-24
期刊：
影响因子：
3.9
通讯作者：
Varga, Imre
中科院分区：
文献类型：
--
作者：
Carrascosa-Tejedor, Javier;Tummino, Andrea;Feher, Bence;Kardos, Attila;Efstratiou, Marina;Skoda, Maximilian W. A.;Gutfreund, Philipp;Maestro, Armando;Lawrence, M. Jayne;Campbell, Richard A.;Varga, Imre
超支化聚乙烯亚胺/十二烷基硫酸钠（PEI/SDS）聚集体在空气/水界面上的膜的界面结构和形态已被解决的第一次相对于电荷密度。最近开发的一种方法，以形成有效的膜从解离的聚集体使用最小量的材料被利用作为一个步骤，在提高对膜的性能的理解，以期他们未来的使用在技术应用。界面技术，解决不同的时间和长度尺度，即椭圆偏振，布鲁斯特角显微镜，和中子反射计，使用。两个组件的扩展结构下形成的单层表面活性剂与绑定的聚电解质膜压缩后调整到pH 4或10，对应于高和低的电荷密度的亚相，分别。一个刚性的膜是有关的PEI在界面结构在pH 4的紧凑的构象，而据观察，聚集体保持嵌入在移动的膜在pH 10。的能力，以紧凑的表面活性剂在单层的最大覆盖范围内的情况下，其最大的覆盖范围是不同的行为，观察到的传播膜涉及线性聚电解质，和有趣的证据点形成的扩展结构在整个范围内的表面压力。我们的结论是，分子结构和电荷密度可以是重要的参数，在控制的结构和性能的扩展的PETS/表面活性剂膜，这具有相关性的一系列应用，如那些使用PEI，包括CO2捕获，电子设备，和基因转染。
The interfacial structure and morphology of films spread from hyperbranched polyethylene imine/sodium dodecyl sulfate (PEI/SDS) aggregates at the air/water interface have been resolved for the first time with respect to polyelectrolyte charged density. A recently developed method to form efficient films from the dissociation of aggregates using a minimal quantity of materials is exploited as a step forward in enhancing understanding of the film properties with a view to their future use in technological applications. Interfacial techniques that resolve different time and length scales, namely, ellipsometry, Brewster angle microscopy, and neutron reflectometry, are used. Extended structures of both components are formed under a monolayer of the surfactant with bound polyelectrolytes upon film compression on subphases adjusted to pH 4 or 10, corresponding to high and low charge density of the polyelectrolyte, respectively. A rigid film is related to compact conformation of the PEI in the interfacial structure at pH 4, while it is observed that aggregates remain embedded in mobile films at pH 10. The ability to compact surfactants in the monolayer to the same extent as its maximum coverage in the absence of polyelectrolyte is distinct from the behavior observed for spread films involving linear polyelectrolytes, and intriguingly evidence points to the formation of extended structures over the full range of surface pressures. We conclude that the molecular architecture and charge density can be important parameters in controlling the structures and properties of spread polyelectrolyte/surfactant films, which holds relevance to a range of applications, such as those where PEI is used, including CO2 capture, electronic devices, and gene transfection.
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影响因子：
3.4
作者：
Dedinaite, A.;Pettersson, T.;Claesson, P. M.
通讯作者：
Claesson, P. M.
影响因子：
3.3
作者：
Amalia Mezei;Pojjak, Katalin;Robert Meszaros
通讯作者：
Robert Meszaros
DOI：
10.3390/ma16031045
发表时间：
2023-01-24
期刊：
Materials (Basel, Switzerland)
影响因子：
--
作者：
通讯作者：
--
影响因子：
9.9
作者：
Campbell, Richard A.;Saaka, Yussif;Lawrence, M. Jayne
通讯作者：
Lawrence, M. Jayne
影响因子：
4.6
作者：
Akanno, Andrew;Guzman, Eduardo;Rubio, Ramon G.
通讯作者：
Rubio, Ramon G.