The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform

Tomohide Niimi - One of the best experts on this subject based on the ideXlab platform.

  • Development of the pressure sensitive Molecular Film technique depending on the pressure ranges
    JOURNAL OF THE FLOW VISUALIZATION SOCIETY OF JAPAN, 2020
    Co-Authors: Yoshiki Sakazaki, Yu Matsuda, Hideo Mori, Toru Uchida, Hiroki Yamaguchi, Tomohide Niimi
    Abstract:

    There is an increasing importance of micro/nano scale flows for the development of MEMS/NEMS (Micro/Nano Electro-Mechanical Systems). The pressure sensitive paint (PSP) technique is considered to be suitable for analyses of these flows in principle. We, therefore, have developed pressure sensitive Molecular Film(PSMF) based on the Langmuir-Blodgett(LB) technique, which is a method to make high ordered mono-Molecular Films, to overcome problems of the existing PSP at micro/nano systems. In this study, we adopt two luminophores for the PSMF in order to select the one for low pressure range and the other for near-atmospheric pressure depending on the pressure range of interest. We clarify their fundamental properties such as pressure sensitivity. As a result, it is confirmed that the PSMF with Palladium(II) MesoporphyrinIX (PtMP) is effective in the low pressure range and that with Platinum(II) MesoporphyrinIX (PdMP) is effective in the atmospheric pressure range.

  • Pressure-sensitive Molecular Film for experimental analyses of micro gas-flows
    ASME 2011 9th International Conference on Nanochannels Microchannels and Minichannels Volume 1, 2011
    Co-Authors: Yu Matsuda, Hiroki Yamaguchi, Yasuhiro Egami, Tomohide Niimi
    Abstract:

    Pressure-sensitive paint (PSP) is an optical measurement technique based on the photo-chemical reaction between oxygen and luminescent molecules, and has potential as a diagnostic tool for pressure measurement in the high Knudsen number regime. However, the application of PSP to micro flow measurement is not straightforward, because conventional PSPs are too thick owing to their polymer binder. In our previous work, we fabricated pressure-sensitive Molecular Film (PSMF) by using the Langmuir-Blodgett (LB) technique. In this study, we investigated the temperature dependency of Pt(II) Mesoporphyrin IX (PtMP) based PSMF, and found that the temperature dependency of the pressure sensitivity is very small. Moreover, we have applied PSMF to the pressure measurement of micro gas flows through the 170μm width micro channel and the 100μm width micro nozzle, and the pressure distributions were successfully obtained.Copyright © 2011 by ASME

  • pressure sensitive Molecular Film for investigation of micro gas flows
    Microfluidics and Nanofluidics, 2011
    Co-Authors: Yu Matsuda, Toru Uchida, Suguru Suzuki, Hiroki Yamaguchi, Ryota Misaki, Tomohide Niimi
    Abstract:

    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.

  • Extension and characterization of pressure-sensitive Molecular Film
    Experiments in Fluids, 2009
    Co-Authors: Yu Matsuda, Hideo Mori, Yoshiki Sakazaki, Toru Uchida, Suguru Suzuki, Hiroki Yamaguchi, Tomohide Niimi
    Abstract:

    Pressure-sensitive paint (PSP) has the potential as a diagnostic tool for pressure measurement in high Knudsen number regime because it works as a so-called “Molecular sensor”. However, there are few reports concerning application of PSP to micro-devices, because conventional PSPs are too thick owing to polymer binders. In our previous work, we adopted the Langmuir–Blodgett (LB) technique to fabricate the pressure-sensitive Molecular Film (PSMF) using Pd(II) Mesoporphyrin IX (PdMP), which has pressure sensitivity only in the low pressure range (below 130 Pa). In this study, aiming for pressure measurement under an atmospheric pressure condition, we have constructed four samples of PSMFs composed of Pt(II) Mesoporphyrin IX (PtMP), Pt(II) Mesoporphyrin IX dimethylester (PtMPDME), Pt(II) Protoporphyrin IX (PtPP) and Cu(II) Mesoporphyrin IX dimethylester (CuMPDME) as luminescent molecules. The pressure sensitivity of those PSMFs was measured, and it was clarified that the pressure sensitivity of PSMF-PtMP is the highest among the four samples. Moreover, the temperature dependency of PSMF-PtMP was investigated, and we found that the temperature dependency of PSMF is dominated not by the oxygen diffusion in the layer, but by non-radiative deactivation process of excited luminescent molecules.

  • Development of pressure sensitive Molecular Film applicable to pressure measurement for high Knudsen number flows
    Experiments in Fluids, 2007
    Co-Authors: Yu Matsuda, Hideo Mori, Tomohide Niimi, Hiroyuki Uenishi, Madoka Hirako
    Abstract:

    Experimental analyses of thermo-fluid phenomena of micro- and nano-flows with high Knudsen number need the measurement techniques based on interaction of atoms or molecules with photons. The pressure-sensitive paint (PSP) technique has potential as a diagnostic tool for pressure measurement in the high Knudsen number regime because it works as a so-called “Molecular sensor”. However, application of PSP to micro devices is very difficult because the conventional PSP is too thick owing to the use of polymer binder and does not have sufficient spatial resolution for pressure measurement of micro-flows. In this study, we have adopted the Langmuir-Blodgett (LB) technique to fabricate pressure sensitive Molecular Films (PSMFs) using Pd(II) Octaethylporphine (PdOEP) and Pd(II) Mesoporphyrin IX (PdMP) to resolve ordinary PSPs problems, and have tested these PSMFs to evaluate the feasibility of the pressure measurement around micro-devices. It is clarified that the PSMF composed of PdMP has higher sensitivity than that of PdOEP. Since it is also considered that the sensitivity of PSMFs can be increased by introducing arachidic acid (AA) as spacer molecules of LB Films to prevent the aggregation of luminescent molecules, we have produced PSMFs with several molar ratio of PdMP to AA. At the most suitable ratio, the PSMF has high sensitivity in the low pressure region with high Knudsen number, even if the amount of the luminescent molecules in the PSMF layer is smaller than that in conventional PSPs. This result indicates that the PSMF is feasible to measure the pressure in high Knudsen number flows such as micro-flows.

Yu Matsuda - One of the best experts on this subject based on the ideXlab platform.

  • Development of the pressure sensitive Molecular Film technique depending on the pressure ranges
    JOURNAL OF THE FLOW VISUALIZATION SOCIETY OF JAPAN, 2020
    Co-Authors: Yoshiki Sakazaki, Yu Matsuda, Hideo Mori, Toru Uchida, Hiroki Yamaguchi, Tomohide Niimi
    Abstract:

    There is an increasing importance of micro/nano scale flows for the development of MEMS/NEMS (Micro/Nano Electro-Mechanical Systems). The pressure sensitive paint (PSP) technique is considered to be suitable for analyses of these flows in principle. We, therefore, have developed pressure sensitive Molecular Film(PSMF) based on the Langmuir-Blodgett(LB) technique, which is a method to make high ordered mono-Molecular Films, to overcome problems of the existing PSP at micro/nano systems. In this study, we adopt two luminophores for the PSMF in order to select the one for low pressure range and the other for near-atmospheric pressure depending on the pressure range of interest. We clarify their fundamental properties such as pressure sensitivity. As a result, it is confirmed that the PSMF with Palladium(II) MesoporphyrinIX (PtMP) is effective in the low pressure range and that with Platinum(II) MesoporphyrinIX (PdMP) is effective in the atmospheric pressure range.

  • Pressure-sensitive Molecular Film for experimental analyses of micro gas-flows
    ASME 2011 9th International Conference on Nanochannels Microchannels and Minichannels Volume 1, 2011
    Co-Authors: Yu Matsuda, Hiroki Yamaguchi, Yasuhiro Egami, Tomohide Niimi
    Abstract:

    Pressure-sensitive paint (PSP) is an optical measurement technique based on the photo-chemical reaction between oxygen and luminescent molecules, and has potential as a diagnostic tool for pressure measurement in the high Knudsen number regime. However, the application of PSP to micro flow measurement is not straightforward, because conventional PSPs are too thick owing to their polymer binder. In our previous work, we fabricated pressure-sensitive Molecular Film (PSMF) by using the Langmuir-Blodgett (LB) technique. In this study, we investigated the temperature dependency of Pt(II) Mesoporphyrin IX (PtMP) based PSMF, and found that the temperature dependency of the pressure sensitivity is very small. Moreover, we have applied PSMF to the pressure measurement of micro gas flows through the 170μm width micro channel and the 100μm width micro nozzle, and the pressure distributions were successfully obtained.Copyright © 2011 by ASME

  • pressure sensitive Molecular Film for investigation of micro gas flows
    Microfluidics and Nanofluidics, 2011
    Co-Authors: Yu Matsuda, Toru Uchida, Suguru Suzuki, Hiroki Yamaguchi, Ryota Misaki, Tomohide Niimi
    Abstract:

    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.

  • Extension and characterization of pressure-sensitive Molecular Film
    Experiments in Fluids, 2009
    Co-Authors: Yu Matsuda, Hideo Mori, Yoshiki Sakazaki, Toru Uchida, Suguru Suzuki, Hiroki Yamaguchi, Tomohide Niimi
    Abstract:

    Pressure-sensitive paint (PSP) has the potential as a diagnostic tool for pressure measurement in high Knudsen number regime because it works as a so-called “Molecular sensor”. However, there are few reports concerning application of PSP to micro-devices, because conventional PSPs are too thick owing to polymer binders. In our previous work, we adopted the Langmuir–Blodgett (LB) technique to fabricate the pressure-sensitive Molecular Film (PSMF) using Pd(II) Mesoporphyrin IX (PdMP), which has pressure sensitivity only in the low pressure range (below 130 Pa). In this study, aiming for pressure measurement under an atmospheric pressure condition, we have constructed four samples of PSMFs composed of Pt(II) Mesoporphyrin IX (PtMP), Pt(II) Mesoporphyrin IX dimethylester (PtMPDME), Pt(II) Protoporphyrin IX (PtPP) and Cu(II) Mesoporphyrin IX dimethylester (CuMPDME) as luminescent molecules. The pressure sensitivity of those PSMFs was measured, and it was clarified that the pressure sensitivity of PSMF-PtMP is the highest among the four samples. Moreover, the temperature dependency of PSMF-PtMP was investigated, and we found that the temperature dependency of PSMF is dominated not by the oxygen diffusion in the layer, but by non-radiative deactivation process of excited luminescent molecules.

  • Development of pressure sensitive Molecular Film applicable to pressure measurement for high Knudsen number flows
    Experiments in Fluids, 2007
    Co-Authors: Yu Matsuda, Hideo Mori, Tomohide Niimi, Hiroyuki Uenishi, Madoka Hirako
    Abstract:

    Experimental analyses of thermo-fluid phenomena of micro- and nano-flows with high Knudsen number need the measurement techniques based on interaction of atoms or molecules with photons. The pressure-sensitive paint (PSP) technique has potential as a diagnostic tool for pressure measurement in the high Knudsen number regime because it works as a so-called “Molecular sensor”. However, application of PSP to micro devices is very difficult because the conventional PSP is too thick owing to the use of polymer binder and does not have sufficient spatial resolution for pressure measurement of micro-flows. In this study, we have adopted the Langmuir-Blodgett (LB) technique to fabricate pressure sensitive Molecular Films (PSMFs) using Pd(II) Octaethylporphine (PdOEP) and Pd(II) Mesoporphyrin IX (PdMP) to resolve ordinary PSPs problems, and have tested these PSMFs to evaluate the feasibility of the pressure measurement around micro-devices. It is clarified that the PSMF composed of PdMP has higher sensitivity than that of PdOEP. Since it is also considered that the sensitivity of PSMFs can be increased by introducing arachidic acid (AA) as spacer molecules of LB Films to prevent the aggregation of luminescent molecules, we have produced PSMFs with several molar ratio of PdMP to AA. At the most suitable ratio, the PSMF has high sensitivity in the low pressure region with high Knudsen number, even if the amount of the luminescent molecules in the PSMF layer is smaller than that in conventional PSPs. This result indicates that the PSMF is feasible to measure the pressure in high Knudsen number flows such as micro-flows.

Hiroki Yamaguchi - One of the best experts on this subject based on the ideXlab platform.

  • Development of the pressure sensitive Molecular Film technique depending on the pressure ranges
    JOURNAL OF THE FLOW VISUALIZATION SOCIETY OF JAPAN, 2020
    Co-Authors: Yoshiki Sakazaki, Yu Matsuda, Hideo Mori, Toru Uchida, Hiroki Yamaguchi, Tomohide Niimi
    Abstract:

    There is an increasing importance of micro/nano scale flows for the development of MEMS/NEMS (Micro/Nano Electro-Mechanical Systems). The pressure sensitive paint (PSP) technique is considered to be suitable for analyses of these flows in principle. We, therefore, have developed pressure sensitive Molecular Film(PSMF) based on the Langmuir-Blodgett(LB) technique, which is a method to make high ordered mono-Molecular Films, to overcome problems of the existing PSP at micro/nano systems. In this study, we adopt two luminophores for the PSMF in order to select the one for low pressure range and the other for near-atmospheric pressure depending on the pressure range of interest. We clarify their fundamental properties such as pressure sensitivity. As a result, it is confirmed that the PSMF with Palladium(II) MesoporphyrinIX (PtMP) is effective in the low pressure range and that with Platinum(II) MesoporphyrinIX (PdMP) is effective in the atmospheric pressure range.

  • pressure sensitive Molecular Film for investigation of micro gas flows
    Microfluidics and Nanofluidics, 2011
    Co-Authors: Yu Matsuda, Toru Uchida, Suguru Suzuki, Hiroki Yamaguchi, Ryota Misaki, Tomohide Niimi
    Abstract:

    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.

  • Pressure-sensitive Molecular Film for experimental analyses of micro gas-flows
    ASME 2011 9th International Conference on Nanochannels Microchannels and Minichannels Volume 1, 2011
    Co-Authors: Yu Matsuda, Hiroki Yamaguchi, Yasuhiro Egami, Tomohide Niimi
    Abstract:

    Pressure-sensitive paint (PSP) is an optical measurement technique based on the photo-chemical reaction between oxygen and luminescent molecules, and has potential as a diagnostic tool for pressure measurement in the high Knudsen number regime. However, the application of PSP to micro flow measurement is not straightforward, because conventional PSPs are too thick owing to their polymer binder. In our previous work, we fabricated pressure-sensitive Molecular Film (PSMF) by using the Langmuir-Blodgett (LB) technique. In this study, we investigated the temperature dependency of Pt(II) Mesoporphyrin IX (PtMP) based PSMF, and found that the temperature dependency of the pressure sensitivity is very small. Moreover, we have applied PSMF to the pressure measurement of micro gas flows through the 170μm width micro channel and the 100μm width micro nozzle, and the pressure distributions were successfully obtained.Copyright © 2011 by ASME

  • Extension and characterization of pressure-sensitive Molecular Film
    Experiments in Fluids, 2009
    Co-Authors: Yu Matsuda, Hideo Mori, Yoshiki Sakazaki, Toru Uchida, Suguru Suzuki, Hiroki Yamaguchi, Tomohide Niimi
    Abstract:

    Pressure-sensitive paint (PSP) has the potential as a diagnostic tool for pressure measurement in high Knudsen number regime because it works as a so-called “Molecular sensor”. However, there are few reports concerning application of PSP to micro-devices, because conventional PSPs are too thick owing to polymer binders. In our previous work, we adopted the Langmuir–Blodgett (LB) technique to fabricate the pressure-sensitive Molecular Film (PSMF) using Pd(II) Mesoporphyrin IX (PdMP), which has pressure sensitivity only in the low pressure range (below 130 Pa). In this study, aiming for pressure measurement under an atmospheric pressure condition, we have constructed four samples of PSMFs composed of Pt(II) Mesoporphyrin IX (PtMP), Pt(II) Mesoporphyrin IX dimethylester (PtMPDME), Pt(II) Protoporphyrin IX (PtPP) and Cu(II) Mesoporphyrin IX dimethylester (CuMPDME) as luminescent molecules. The pressure sensitivity of those PSMFs was measured, and it was clarified that the pressure sensitivity of PSMF-PtMP is the highest among the four samples. Moreover, the temperature dependency of PSMF-PtMP was investigated, and we found that the temperature dependency of PSMF is dominated not by the oxygen diffusion in the layer, but by non-radiative deactivation process of excited luminescent molecules.

Toru Uchida - One of the best experts on this subject based on the ideXlab platform.

  • Development of the pressure sensitive Molecular Film technique depending on the pressure ranges
    JOURNAL OF THE FLOW VISUALIZATION SOCIETY OF JAPAN, 2020
    Co-Authors: Yoshiki Sakazaki, Yu Matsuda, Hideo Mori, Toru Uchida, Hiroki Yamaguchi, Tomohide Niimi
    Abstract:

    There is an increasing importance of micro/nano scale flows for the development of MEMS/NEMS (Micro/Nano Electro-Mechanical Systems). The pressure sensitive paint (PSP) technique is considered to be suitable for analyses of these flows in principle. We, therefore, have developed pressure sensitive Molecular Film(PSMF) based on the Langmuir-Blodgett(LB) technique, which is a method to make high ordered mono-Molecular Films, to overcome problems of the existing PSP at micro/nano systems. In this study, we adopt two luminophores for the PSMF in order to select the one for low pressure range and the other for near-atmospheric pressure depending on the pressure range of interest. We clarify their fundamental properties such as pressure sensitivity. As a result, it is confirmed that the PSMF with Palladium(II) MesoporphyrinIX (PtMP) is effective in the low pressure range and that with Platinum(II) MesoporphyrinIX (PdMP) is effective in the atmospheric pressure range.

  • pressure sensitive Molecular Film for investigation of micro gas flows
    Microfluidics and Nanofluidics, 2011
    Co-Authors: Yu Matsuda, Toru Uchida, Suguru Suzuki, Hiroki Yamaguchi, Ryota Misaki, Tomohide Niimi
    Abstract:

    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.

  • Extension and characterization of pressure-sensitive Molecular Film
    Experiments in Fluids, 2009
    Co-Authors: Yu Matsuda, Hideo Mori, Yoshiki Sakazaki, Toru Uchida, Suguru Suzuki, Hiroki Yamaguchi, Tomohide Niimi
    Abstract:

    Pressure-sensitive paint (PSP) has the potential as a diagnostic tool for pressure measurement in high Knudsen number regime because it works as a so-called “Molecular sensor”. However, there are few reports concerning application of PSP to micro-devices, because conventional PSPs are too thick owing to polymer binders. In our previous work, we adopted the Langmuir–Blodgett (LB) technique to fabricate the pressure-sensitive Molecular Film (PSMF) using Pd(II) Mesoporphyrin IX (PdMP), which has pressure sensitivity only in the low pressure range (below 130 Pa). In this study, aiming for pressure measurement under an atmospheric pressure condition, we have constructed four samples of PSMFs composed of Pt(II) Mesoporphyrin IX (PtMP), Pt(II) Mesoporphyrin IX dimethylester (PtMPDME), Pt(II) Protoporphyrin IX (PtPP) and Cu(II) Mesoporphyrin IX dimethylester (CuMPDME) as luminescent molecules. The pressure sensitivity of those PSMFs was measured, and it was clarified that the pressure sensitivity of PSMF-PtMP is the highest among the four samples. Moreover, the temperature dependency of PSMF-PtMP was investigated, and we found that the temperature dependency of PSMF is dominated not by the oxygen diffusion in the layer, but by non-radiative deactivation process of excited luminescent molecules.

Suguru Suzuki - One of the best experts on this subject based on the ideXlab platform.

  • pressure sensitive Molecular Film for investigation of micro gas flows
    Microfluidics and Nanofluidics, 2011
    Co-Authors: Yu Matsuda, Toru Uchida, Suguru Suzuki, Hiroki Yamaguchi, Ryota Misaki, Tomohide Niimi
    Abstract:

    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.

  • Extension and characterization of pressure-sensitive Molecular Film
    Experiments in Fluids, 2009
    Co-Authors: Yu Matsuda, Hideo Mori, Yoshiki Sakazaki, Toru Uchida, Suguru Suzuki, Hiroki Yamaguchi, Tomohide Niimi
    Abstract:

    Pressure-sensitive paint (PSP) has the potential as a diagnostic tool for pressure measurement in high Knudsen number regime because it works as a so-called “Molecular sensor”. However, there are few reports concerning application of PSP to micro-devices, because conventional PSPs are too thick owing to polymer binders. In our previous work, we adopted the Langmuir–Blodgett (LB) technique to fabricate the pressure-sensitive Molecular Film (PSMF) using Pd(II) Mesoporphyrin IX (PdMP), which has pressure sensitivity only in the low pressure range (below 130 Pa). In this study, aiming for pressure measurement under an atmospheric pressure condition, we have constructed four samples of PSMFs composed of Pt(II) Mesoporphyrin IX (PtMP), Pt(II) Mesoporphyrin IX dimethylester (PtMPDME), Pt(II) Protoporphyrin IX (PtPP) and Cu(II) Mesoporphyrin IX dimethylester (CuMPDME) as luminescent molecules. The pressure sensitivity of those PSMFs was measured, and it was clarified that the pressure sensitivity of PSMF-PtMP is the highest among the four samples. Moreover, the temperature dependency of PSMF-PtMP was investigated, and we found that the temperature dependency of PSMF is dominated not by the oxygen diffusion in the layer, but by non-radiative deactivation process of excited luminescent molecules.