Pressure-sensitive molecular film for investigation of micro gas flows
Pressure-sensitive molecular film for investigation of micro gas flows
复制标题
DOI：
10.1007/s10404-010-0664-6
复制
发表时间：
2011-01-01
影响因子：
2.8
通讯作者：
Niimi, Tomohide
中科院分区：
文献类型：
--
作者：
Matsuda, Yu;Uchida, Toru;Niimi, Tomohide
随着微纳米技术的发展，人们迫切希望了解微纳米器件内部或周围的热流体现象。基于分子对光子的吸收和发射的光学测量技术可用于微纳米流热流体现象的实验分析。压敏涂料（PSP）技术是一种潜在的诊断工具，用于微/纳米气体流动的压力测量，因为它可以作为所谓的“分子传感器”工作。然而，由于聚合物粘合剂的使用，发光分子的聚集和它们的厚膜限制了PSP的微尺度测量。在我们之前的工作中，我们采用Langmuir-Blodgett （LB）技术制备了具有有序分子组装的压敏分子膜（PSMF），并研究了PSMF的性能。本文提出了一种提高PSMF发光强度的新方法，并利用PSMF成功测量了微喷嘴内的压力分布。将PSMF测量的压力分布与直接模拟蒙特卡罗（DSMC）方法的数值分析结果进行了比较，两者吻合较好。
For the development of micro- and nano-technology, it has been strongly desired to understand thermo-fluid phenomena inside or around micro- and nano-devices. An optical measurement technique based on the absorption and the emission of photons by molecules is useful for experimental analyses of thermo-fluid phenomena of micro and nanoflows. The pressure-sensitive paint (PSP) technique is a potential diagnostic tool for pressure measurements of micro/nano gas flows because it works as a so-called "molecular sensor". However, the micro-scale measurement of PSP has been limited by the aggregation of the luminescent molecules and their thick film due to the use of a polymer binder. In our previous work, we adopted the Langmuir-Blodgett (LB) technique to fabricate pressure-sensitive molecular film (PSMF) with ordered molecular assemblies, and investigated properties of PSMF. In this study, a novel approach to enhance the luminescent intensity of PSMF is proposed, and the pressure distribution in a micro-nozzle is successfully measured by using PSMF. Moreover, we compared the pressure distribution measured by PSMF with that numerically analyzed by the direct simulation monte carlo (DSMC) method, showing good agreement with each other.