Department of Applied Physics, Eindhoven University of Technology , Eindhoven 5600MB, The Netherlands.
Langmuir. 2017 Apr 18;33(15):3647-3658. doi: 10.1021/acs.langmuir.7b00278. Epub 2017 Apr 6.
We evaluated the sensitivity and time resolution of a technique for photochemical reaction monitoring based on the interferometric detection of the deformation of liquid films. The reaction products change the local surface tension and induce Marangoni flow in the liquid film. As a model system, we consider the irradiation of the aliphatic hydrocarbon squalane with broadband deep-UV light. We developed a numerical model that quantitatively reproduces the flow patterns observed in the experiments. Moreover, we present self-similarity solutions that elucidate the mechanisms governing different stages of the dynamics and their parametric dependence. Surface tension changes as small as Δγ = 10 N/m can be detected, and time resolutions of <1 s can be achieved.
我们评估了一种基于液体膜变形的干涉检测的光化学反应监测技术的灵敏度和时间分辨率。反应产物改变局部表面张力并在液体膜中诱导马兰戈尼流。作为模型体系，我们考虑用宽带深紫外光辐照脂肪烃 squalane。我们开发了一个数值模型，可以定量再现实验中观察到的流动模式。此外，我们还提出了自相似解，阐明了控制动力学不同阶段及其参数依赖性的机制。可以检测到小至Δγ=10 N/m 的表面张力变化，并且可以实现<1 s 的时间分辨率。
