Using Diffusion To Characterize Interfacial Heterogeneity
Using Diffusion To Characterize Interfacial Heterogeneity
复制标题
DOI：
10.1021/acs.langmuir.6b04341
复制
发表时间：
2017-02-07
期刊：
影响因子：
3.9
通讯作者：
Blanchard, Gary J.
中科院分区：
文献类型：
--
作者：
Kijewska, Krystyna;Blanchard, Gary J.
我们报告了在一定长度尺度上使用分子扩散运动来表征单层结构中的成分异质性。这项工作的重点是在功能化二氧化硅表面上支持的两种类型的薄膜中苝的扩散运动：单组分（硬脂酸）和双组分（碳氢化合物/氟碳）薄膜。Langmuir-Blodgett （LB）单层膜直接沉积在二氧化硅上或通过金属离子络合与表面改性二氧化硅结合。用A等温线和布氏角显微镜（BAM）对LB膜的形成和沉积过程进行了表征。通过比较相同LB膜上的旋转扩散数据（荧光各向异性衰变成像）和平移扩散数据（光漂白后荧光恢复）来评估发色团迁移率和单层结构非均质性。我们的结果表明，发色团的迁移率敏感地取决于金属离子的身份和薄膜的组成。
We report on the use of molecular diffusional motion over a range of length scales to characterize compositional heterogeneity in monolayer structures. This work focuses on the diffusional motion of perylene in two types of films supported on functionalized silica surfaces: single-component (stearic acid) and two-component (hydrocarbon/fluorocarbon) films. Langmuir-Blodgett (LB) monolayers were deposited directly on silica or were bound to surface-modified silica by means of metal ion complexation. The LB films were characterized by their A isotherms and by Brewster angle microscopy (BAM) during formation and deposition. Chromophore mobility and monolayer structural heterogeneity were evaluated by comparing rotational diffusion data (fluorescence anisotropy decay imaging) and translational diffusion data (fluorescence recovery after photobleaching) on the same LB films. Our results indicate that the mobility of the chromophore depends sensitively on both metal ion identity and film composition.