• Title/Summary/Keyword: TFPP

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Electrochemical Performance of Tricredyl Phosphate and Trispentafluorophenly Phosphine as Flame Retardant Additives for Lithium-ion Batteries (리튬이온전지용 난연성 첨가제(TCP, TFPP)의 전기화학적 특성)

  • Ahn, Se-Young;Kim, Ke-Tack;Kim, Hyun-Soo;Nam, Sang-Yong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.9
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    • pp.756-760
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    • 2007
  • Flame retardant(FR) properties were investigated with tricredyl phosphate(TCP) and tris(pentafluorophenyl)phosphine(TFPP) as additives for lithium-ion batteries. Thermal stability was improved with additives in $Li/LiNi\frac{1}{3}Mn\frac{1}{3}Co\frac{1}{3}O_2$ cells comparing to non-additive electrolytes. Oxygen evolution reaction of the cathode material was delayed to up $55^{\circ}C$, from $275^{\circ}C\;to\;330^{\circ}C$. Electrolytes with the 1 wt.% additives provided good FR properties while the resonable battery performance is maintained.

Development of Pressure Sensitive Paint(PSP) technique for low-speed flows and its application (아음속 저속 유동용 Pressure Sensitive Paint의 개발과 응용)

  • Kang, Jong-Hoon;Lee, Sang-Joon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.32 no.4
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    • pp.12-17
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    • 2004
  • The PSP technique has been used to measure pressure distribution on model surfaces ins high-speed flows. The objective of this study is to develop a PSP technique which can be applied to low-speed aerodynamic flows. Four different PSP formulations including two porphyrins (PtOEP and PtTFPP) and two polymers (Poly(TMSP) and RTV-118) were tested and the performance of each combination was evaluated. In a static calibration, the luminescent intensity of the PSP coatings was measured from 0kPa to 11kPa with 0.5, 1, 2kPa increments. Among 4 PSP formulations tested, the combination of PtOEP and RTV-118 shows the best performance. The developed PSP technique was applied to an oblique impinging jet to measure the pressure field distribution on the impinging plate.

Performance Comparison of Pressure Sensitive Paint and Pressure Field Measurement of Oblique Impinging Jet (Pressure Sensitive Paint의 성능비교 및 경사충돌분류의 압력장 측정)

  • Lee, Sang-Ik;Lee, Sang-Joon
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.26 no.7
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    • pp.1031-1038
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    • 2002
  • The pressure sensitive paint (PSP) has recently received a considerable attention in the fields of aerodynamics and fluid mechanics as a new revolutionary optical technique to measure pressure fields on a body surface. In this study, the feasibility and effectiveness of the PSP pressure field measurement technique have been investigated experimentally. Seven different PSP formulations including two porphyrins(PtOEP and PtTFPP) and four polymers(Polystyrene, cellulous acetate butyrate, GP-197 and Silicon-708) were tested to check the performance and characteristics of each combination. The static calibration of each PSP formulation was carried out in a constant-pressure chamber. The PSP technique was applied to an oblique impinging jet flow to measure variation of pressure field on the impinging plate at on oblique jet angle of ${\theta}=60^{\circ}$. Pressure field images were captured by an 12bit intensified CCD(ICCD, $1K{\times}1K$)camera. As a result, the dynamic response of PSP depends on the oxygen permeability of polymer and the photochemical interaction between luminophore and polymer as well as the reaction of luminophore itself. The reaction of luminophore was changed by employing different polymers. In conclusion, Among 7 PSP formulation tested, the combination of PtTFPP and cellulous acetate butyrate show the best performance. In addition, the detail pressure field of an oblique high-speed impinging jet was measured effectively using the PSP technique.

Fabrication of Pressure Sensitive Paint for Visualizing Surface Pressure Distribution (표면압력 분포 가시화를 위한 압력감응 페인트의 제작)

  • An, Choiran;Ki, Hyojin;Jin, Byeong Kyou;Kim, Jung Kyun;Kim, Sug Bum;Jo, Yong Hwa;Nho, Young Cheol;Choi, Yong Duk;Kwak, Jae Su;Choi, Yong Gyu
    • Journal of Aerospace System Engineering
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    • v.2 no.3
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    • pp.19-23
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    • 2008
  • We have fabricated pressure sensitive paint films consisting of PtTFPP activators dispersed in fluorinated polymer matrix. This matrix material is unique in its composition and structure. We evaluated the oxygen quenching effects, and thus the pressure sensitivity, of the fabricated films in terms of various processing parameters. Based on the experimental results, we anticipate that a good but new pressure sensitive paint would be presented through further elaboration of the polymer compositions and optimization of the processing conditions.

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Development of Pressure Sensitive Paint (PSP) Technique for Low-speed Flows and Its Application (저속 유동용 Pressure Sensitive Paint 기술개발과 응용)

  • Kang, Jong-Hun;Lee, Sang-Joon
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.688-693
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    • 2003
  • The PSP technique has been used to measure pressure distribution on a model surface quantitatively. The objective of this study is to develop PSP technique which can be applied to low-speed flows. Four different PSP formulations including two porphyrins (PtOEP and PtTFPP) and two polymers (Poly(TMSP) and RTV-118) were tested and the performance of each combination was checked. In the static calibration, the luminescent intensity of the PSP coatings was measured from 0kPa to 11kPa with 0.5, 1, 2kPa increments. Among 4 PSP formulations tested, the combination of PtOEP and RTV-118 shows the best performance. The PSP technique was applied to an oblique impinging jet to measure the pressure field distribution on the impinging plate.

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Flow Visualization of Flowfield Structures around an Aerospike Nozzle using LIF and PSP

  • NIIMI Tomohide;MORI Hideo;TANIGUCHI Mashio
    • 한국가시화정보학회:학술대회논문집
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    • 2004.12a
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    • pp.75-80
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    • 2004
  • Aerospike nozzles have been expected to be used for an engine of a reusable space shuttle to respond to growing demand for rocket-launching and its cost reduction. In this study, the flow field structures in any cross sections around clustered linear aerospike nozzles are visualized and analyzed, using laser induced fluorescence (LIF) of nitrogen monoxide seeded in the carrier gas of nitrogen. Since flow field structures are affected mainly by pressure ratio, the clustered linear aerospike nozzle is set inside a vacuum chamber to carry out the experiments in the wide range of pressure ratios from 75 to 200. Flow fields are visualized in several cross-sections, demonstrating the complicated three-dimensional flow field structures. Pressure sensitive paint (PSP) of PtTFPP bound by poly- IBM -co-TFEM is also applied to measurement of the complicated pressure distribution on the spike surface, and to verification of contribution of a truncation plane to the thrust. Finally, to examine the effect of the sidewalls attached to the aerospike nozzle, the flow fields around the nozzle with the sidewalls are compared with those without sidewalls.

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