利用振动光谱测量纳米尺度界面接触面积
Measurement of Nanoscale Interfacial Contact Area Using Vibrational Spectroscopy
AI总结：
本文结合成像ATR-IR与SFG光谱技术，测量纳米尺度真实接触面积并探测分子间相互作用，揭示分子取向比接触位点数量对界面相互作用更为关键。
摘要：
理解物体之间接触的程度对于自然界中表面驱动的现象至关重要。尽管已知相互作用发生在亚纳米长度尺度，但测量如此小长度尺度所需的技术仍然缺乏。我们结合了两种互补技术：与成像探测器耦合的衰减全反射红外（ATR-IR）光谱和和频产生（SFG）光谱，以表征表面之间的真实接触面积。成像ATR-IR提供了在大于分子长度尺度上表面之间气隙分离的分布，以及对真实接触面积的估计。此外，SFG直接探测在分子尺度上发生的分子间相互作用。通过结合这些技术，我们展示了在软弹性体上的薄而刚性/玻璃态聚合物薄膜以及刚性/玻璃态样品中接触是如何实现的。有趣的是，我们还表明，接触中分子的取向是影响界面相互作用的关键因素，而不仅仅是接触的分子位点数量。
英文摘要：
Understanding the extent of contact between objects is crucial for surface-driven phenomena in the natural world. While interactions are known to occur at subnanometer-length scales, the techniques needed to measure such small-length scales are lacking. We combined two complementary techniques of attenuated total reflectance infrared (ATR-IR) spectroscopy coupled with an imaging detector and sum frequency generation (SFG) spectroscopy to characterize the real contact area between surfaces. Imaging ATR-IR provides the distribution of airgap separation between the surfaces at larger than molecular length scales as well as an estimation of the real contact area. Additionally, SFG directly probes the intermolecular interactions occurring at molecular scales. Through the combination of these techniques, we show how contact is achieved for both thin, rigid/glassy polymer films on top of soft elastomers and rigid/glassy samples. Interestingly, we also show that the orientation of the molecules in contact is a critically important factor that influences interfacial interactions rather than just the number of molecular sites in contact.
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