scholarly journals Characterization of Response Frequency for the Pressure-Sensitive Paint Based on Fluorine-Containing Polymer Matrixes Using Oscillating Sound Wave Technique

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6310
Author(s):  
Yun Shao ◽  
Liusheng Chen ◽  
Qi Liao ◽  
Heng Jiang ◽  
Zhitian Liu ◽  
...  
Keyword(s):  
Sound Wave ◽  
Group Structure ◽  
Ester Group ◽  
Pressure Sensitive Paint ◽  
Response Frequency ◽  
Sensor Layer ◽  
Pressure Sensitive ◽  
Wave Technique ◽  
Quenching By Oxygen

Five kinds of new homo-polymer and copolymers of methacrylate containing a fluorine ester group were synthesized and used for the binder of pressure-sensitive paint (PSP)to ensure the good compatibility between luminophore (Pt(II) meso-tetra (pentafluorophenyl) porphine (PtTFPP)) and polymer binder. In the work, we were concerned with how the structure of thesepolymers containing fluorine, especially the various ester group structure, affects the response frequency of PSP using oscillating sound wave technique. The results showed that the pressure sensitivities (Sp) of these PSP samples containing different polymers, exhibit some difference. The length of ester chain on the methacrylatepolymer affects the response frequency of PSP sensor layer composed of the polymer. The longer the chain length of the ester group, the higher the response frequency of the PSP sensor layer quenching by oxygen.

scholarly journals Characterization of pressure dynamics in an axisymmetric separating/reattaching flow using fast-responding pressure-sensitive paint

2012 ◽  
Vol 53 (6) ◽  
pp. 1737-1749 ◽  
Author(s):  
Martin Bitter ◽  
Tatsuya Hara ◽  
Rainer Hain ◽  
Daisuke Yorita ◽  
Keisuke Asai ◽  
...  
Keyword(s):  
Pressure Sensitive Paint ◽  
Pressure Sensitive ◽  
Pressure Dynamics

Synthesis and spectroscopic characterization of Ni, Zn, Pd and Pt tetra(pentafluorophenyl)porpholactone with comparisons to Mg, Zn, Y, Pd and Pt metal complexes of tetra(pentafluorophenyl)porphine

2002 ◽  
Vol 06 (02) ◽  
pp. 135-145 ◽  
Author(s):  
Gamal Khalil ◽  
Martin Gouterman ◽  
Stephen Ching ◽  
Colin Costin ◽  
Lisa Coyle ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Lactone Ring ◽  
Spectroscopic Characterization ◽  
Pressure Sensitive Paint ◽  
Free Base ◽  
Pressure Sensitive ◽  
Standard Procedures ◽  
Phosphorescence Emission ◽  
Eu Complexes

Ni , Zn , Pd and Pt tetra(pentafluorophenyl)porpholactone (TFPL) were synthesized and identified by their optical and mass spectra. The lactone ring was produced from the parent free-base porphyrin using silver nitrate and oxalic acid with a yield of 73%, and the metals were inserted by standard procedures from metal salts. The compounds show intense Soret Bands in the region 390-420 nm. The longest wavelength visible absorbance peaks, in the region 572-608 nm, are weaker than the Soret peaks by a factor of only ~3 for the Ni , Pd , and Pt complexes but a factor of ~10 for the free-base and Zn complexes. As found with other metalloporphyrins the Ni complex is dark, Zn shows fluorescence and Pd and Pt complexes show strong phosphorescence. The Pd complex also shows a weak fluorescence not quenched by oxygen. The phosphorescence lifetimes of Pd and Pt complexes of TFPL in 3-methylpentane at 77 K are, respectively, ~1 ms and ~70 μs, about 60% that of the TFPP complexes. The wavelengths of phosphorescence emission, 733 nm and 758 nm for PtTFPL and PdTFPL, respectively, are sufficiently red-shifted so that these pressure sensitive luminophors can be included in the same pressure sensitive paint (PSP) as Eu complexes, whose emission at ~615 nm can serve as a temperature sensor. The fluorescences of Mg , Zn , and Y(TFPP) show weak origin bands, making them suitable as unquenched references for PSP.

Study of Pressure Sensitive Coating Using Palladium Octaethylporphyrin as Luminescent Molecule

2010 ◽  
Vol 143-144 ◽  
pp. 1002-1006
Author(s):  
Xian Long Cao ◽  
Hong Da Deng ◽  
Wei Lan
Keyword(s):  
High Sensitivity ◽  
Experimental Setup ◽  
Polymeric Binder ◽  
Pressure Sensitive Paint ◽  
Surface Pressure Distribution ◽  
Pressure Sensitive ◽  
Sensitive Coating ◽  
Very High ◽  
Quenching By Oxygen ◽  
Phosphorescence Spectra

Pressure sensitive paint (PSP) has become a useful tool to measure the surface pressure distribution of aerodynamic components replacing conventional pressure taps. For the PSP technique based on the luminescence quenching by oxygen, improvement of its sensitivity is important. In this study, we synthesized palladium octaethylporphyrin (PdOEP) as luminophor and embeded PdOEP in polydimethylsiloxane (PDMS) as polymeric binder to make up of pressure sensitive paints. We used UV/Vis spectrometer and spectrofluorimeter to study the absorption and phosphorescence spectra of PdOEP. In addition, by our self-made experimental setup, the sensitivity of PSPs were examined especially in the range of pressure below 150 Pa. As a result, it is clarified that the PSP using PdOEP as a luminophore and using PDMS as a binder has very high sensitivity to oxygen pressure in low pressure conditions below 150 Pa.

scholarly journals Synthesis and Characterization of Pentaeritritol Tetranitrate (PETN)

2020 ◽  
Vol 3 (2) ◽  
Keyword(s):  
Group Structure ◽  
Ester Group ◽  
High Energy ◽  
High Yield ◽  
Pentaerythritol Tetranitrate ◽  
Energy Materials ◽  
Scanning Calorimetry ◽  
Direct Form ◽  
Fuming Nitric Acid

Pentaerythritol tetranitrate is considered a high explosive that has been widely studied for its chemical and mechanical properties due to its nitrate ester group structure. Its applicability is intended from military purposes to medicine and pharmacy. It is often a substitute for nitroglycerin and can be incorporated into polymeric matrices that enhance its properties and make it safer to handle. In this work a synthesis of direct form elaborated according to the reference material was presented, by the discontinuous nitration process, conducted in several steps starting from Pentaerythritol (PE) with fuming nitric acid, having a very significant and expected yield according to data referenced in previous studies. Fourier Transform Infrared Spectroscopy (FTIR-ATR), Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) analyzes confirm the chemical structure of the substance obtained and the mass variation as a function of temperature, and typical information which can be derived from measurements such as characteristic temperatures (melting, crystallization, reactions, glass transition) for characterization of high energy materials. The explosive obtained by the new route proves to be effective and high yield.

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