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Boostream: a dynamic fluid flow process to assemble nanoparticles at liquid interface

机译：偏振河：动态流体流动过程，用于在液体界面上组装纳米粒子

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摘要

CEA-LITEN develops an original process called Boostream (R) to manipulate, assemble and connect micro- or nanoparticles of various materials, sizes, shapes and functions to obtain monolayer colloidal crystals (MCCs). This process uses the upper surface of a liquid film flowing down a ramp to assemble particles in a manner that is close to the horizontal situation of a Langmuir-Blodgett film construction. In presence of particles at the liquid interface, the film down-flow configuration exhibits an unusual hydraulic jump which results from the fluid flow accommodation to the particle monolayer. In order to master our process, the fluid flow has been modeled and experimentally characterized by optical means, such as with the moire technique that consists in observing the reflection of a succession of periodic black-and-red fringes on the liquid surface mirror. The fringe images are deformed when reflected by the curved liquid surface associated with the hydraulic jump, the fringe deformation being proportional to the local slope of the surface. This original experimental setup allowed us to get the surface profile in the jump region and to measure it along with the main process parameters (liquid flow rate, slope angle, temperature sensitive fluid properties such as dynamic viscosity or surface tension, particle sizes). This work presents the experimental setup and its simple model, the different experimental characterization techniques used and will focus on the way the hydraulic jump relies on the process parameters.
机译：CEA-LITEN开发一个称为Boostream（R）的原始过程，以操纵，组装和连接各种材料的微观或纳米颗粒，尺寸，形状和功能，以获得单层胶体晶体（MCC）。该方法使用液体膜的上表面以靠近Langmuir-Blodgett薄膜结构的水平状况的方式流动以使颗粒组装成颗粒。在液体界面处的颗粒存在下，薄膜下流配置表现出不寻常的液压跳跃，其由流体流动容纳到颗粒单层产生。为了掌握我们的过程，流体流动已经通过光学装置进行了建模和实验，例如用莫尔技术，包括观察液体表面镜上连续的周期性的黑色和红色条纹的反射。当由与液压跳跃相关的弯曲液体表面反射时，条纹图像变形，条纹变形与表面的局部斜率成比例。这种原始的实验设置允许我们在跳跃区域中获得表面轮廓并与主过程参数一起测量它（液体流速，斜率，温度敏感的流体性质，例如动态粘度或表面张力，粒度尺寸）。这项工作介绍了实验设置及其简单模型，使用了不同的实验表征技术，并将重点关注液压跳跃依赖于工艺参数的方式。

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