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Pressure-sensitive molecular film for investigation of micro gas flows

Pressure-sensitive molecular film for investigation of micro gas flows,10.1007/s10404-010-0664-6,Microfluidics and Nanofluidics,Yu Matsuda,Toru Uchida

Pressure-sensitive molecular film for investigation of micro gas flows   (Citations: 2)
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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.
Journal: Microfluidics and Nanofluidics - MICROFLUID NANOFLUID , vol. 10, no. 1, pp. 165-171, 2011
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    • ...We developed pressure-sensitive molecular film (PSMF) with ordered molecular assemblies (Matsuda et al. 2007; Matsuda et al. 2009) and successfully obtained the pressure distribution in a micro nozzle (Matsuda et al. 2011)...
    • ...The experimental apparatus for the PSCC measurement was the same as that for the PSMF which described elsewhere (Matsuda et al. 2011)...
    • ...The pressure distribution on the nozzle surface was successfully obtained without any aggregations of luminophore observed in conventional sprayed PSPs (Mori et al. 2005; Matsuda et al. 2011)...
    • ...The fluctuation of the measured pressure values was ±0.5 kPa at the lowest SN ratio area (e.g., x ¼ 10; 810 lm) and this is much smaller than that by PSMF (Matsuda et al. 2011)...

    Yu Matsudaet al. Pressure-sensitive channel chip for visualization measurement of micro...

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