Synchrotron XRR study of soft nanofilms at the mica-water interface
Synchrotron XRR study of soft nanofilms at the mica-water interface
复制标题
云母-水界面软纳米膜的同步辐射XRR研究
DOI：
10.1039/c2sm07179g
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发表时间：
2012
期刊：
影响因子：
3.4
通讯作者：
Briscoe W
中科院分区：
文献类型：
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作者：
Briscoe W
我们在这里描述了一个专用于同步加速器x射线反射（XRR）表征云母-水界面软物质纳米膜的液体电池的设计。该电池的特点是“弯曲云母”方法：通过略微弯曲云母衬底，使云母片沿着弯曲轴的刚性得到增强，沿着圆柱体顶点提供XRR测量所需的足够的平整度。使用该电池，我们已经对许多系统进行了XRR测量，在本文中，我们展示了示例结果：(1)阳离子表面活性剂C16TAB；(2)两性离子表面活性剂C12H25PC；(3)半氟表面活性剂F4H11(d)TAB；(4)阴离子氟化表面活性剂CsPFN和带正电的聚合物PEI的表面配合物。对于数据分析，我们考虑了云母晶体截断棒，即云母衬底的反射率，并使用基于Java™的定制软件包对数据进行了拟合。我们的研究结果揭示了这些软纳米膜的详细结构信息，表明该方法适用于广泛的云母-水界面软物质结构的XRR测量。
We describe here the design of a liquid cell specific for synchrotron X-ray reflectometry (XRR) characterisation of soft matter nanofilms at the mica–water interface. The feature of the cell is a “bending mica” method: by slightly bending the mica substrate over an underling cylinder the rigidity of the mica sheet along the bending axis is enhanced, providing sufficient flatness along the apex of the cylinder as required by XRR measurements. Using this cell, we have performed XRR measurements for a number of systems and in this article we show example results: (1) a cationic surfactant, C16TAB; (2) a zwitterionic surfactant, C12H25PC; (3) a semi-fluorinated surfactant, F4H11(d)TAB; and (4) surface complex of an anionic fluorinated surfactant, CsPFN, and a positively charged polymer, PEI. For the data analysis we have taken into account the mica crystal truncation rod, i.e. the reflectivity from the mica substrate, and fitted the data with a custom Java™ based software package. Our results unravel detailed structural information of these soft nanofilms, indicating that this method is suitable for XRR measurements of a wide range of soft matter structures at the mica–water interface.