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Encapsulation of low density plastic foam materials for the fast ignition realization experiment (FIREX) control of microstructure and density
http://hdl.handle.net/10655/3054
http://hdl.handle.net/10655/3054956e3879-163c-4dd7-a2d5-de3ded1b3f1f
| Item type | 研究報告書 / Research Paper(1) | |||||||||||||||||||||||||||
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| 公開日 | 2010-02-05 | |||||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||||
| タイトル | Encapsulation of low density plastic foam materials for the fast ignition realization experiment (FIREX) control of microstructure and density | |||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||
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| 言語 | eng | |||||||||||||||||||||||||||
| 資源タイプ | ||||||||||||||||||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||||||||||||||||||||||||
| 資源タイプ | research report | |||||||||||||||||||||||||||
| アクセス権 | ||||||||||||||||||||||||||||
| アクセス権 | metadata only access | |||||||||||||||||||||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||||||||||||||||||||||||
| 著者 |
"Nagai, Keiji
× "Nagai, Keiji
× Yang, H.
× Iwamoto, A.
× Nakai, M.
× Homma, H.
× Shiraga, H.
× Azechi, H.
× Tanaka, K. A.
× Kodama, R.
× Norimatsu, T.
× Mima, K."
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| 抄録 | ||||||||||||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||||||||||||
| 内容記述 | "Development of foam capsule fabrication for cryogenically cooled fuel targets is overviewed in the present paper. The fabrication development was initiated as a part of the Fast Ignition Realization Experiment (FIREX) Project at the ILE, Osaka University in the way of bilateral collaboration between Osaka University and National Institute for Fusion Science (NIFS). A foam cryogenic target was designed where low-density foam shells with a conical light guide will be cooled down to the cryogenic temperature and will be fueled through a narrow pipe. The required diameter and thickness of the capsule are 500 μm and 20 μm, respectively. The material should be low-density plastics foam. We have prepared such capsules using 1) mixtureing a new material of (phloroglucinolcarboxylic acid)/formalin (PF) linear polymer to control kinematic viscosity of the precursor, 2) phase-transfer-catalyzed gelation process to keep density matching of three phases of the emulsion. 3) non-volatile silicone oil as outer oil of emulsion in order to prevent hazard halogenated hydrocarbon and flammable mineral oil. The obtained foam capsule had fine structure of 180 nm (outer surface) to 220 nm (inner surface) and uniform thickness reaching to resolution limit of optical analysis (~0.5 μm). A small hole was made before the solvent exchange and the drying process to prevent distortion due to volume changes. The density of dried foam was 0.29 g/cm3. After attaching the petawatt laser guiding cone and fueling glass tube, poly([2,2]paracyclophane) was coated on the foam surface and supplied for a fueling test of cryogenic hydrogen. Generally, lower density is from larger pore, then precise control of thickness and its encapsulation becomes more difficult. We have clarified the relation between pore size and preparation conditions using several precursor materials, and revealed how to control pore size of low density foams, where the solvent affinity for the polymer chain plays fundamental role. By a gelation of PF solution and extraction to remove the organic solvent, PF aerogel was obtained to be 145 mg/cm^3. The pore size of the PF aerogel was less than 100 nm while that of previous RF/PF mixture was 200-500 nm. The SEM showed that PF had particle-like foam structure while RF had fibrous-like foam structure." | |||||||||||||||||||||||||||
| 書誌情報 |
en : Research Report NIFS-Series 発行日 2008-10-01 |
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| 報告書番号 | ||||||||||||||||||||||||||||
| NIFS-939 | ||||||||||||||||||||||||||||
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| 収録物識別子タイプ | ISSN | |||||||||||||||||||||||||||
| 収録物識別子 | 0915-633X | |||||||||||||||||||||||||||
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"Nagai, Keiji , Yang, H., Iwamoto, A., Nakai, M., Homma, H., Shiraga, H., Azechi, H., Tanaka, K. A., Kodama, R., Norimatsu, T., Mima, K.", 2008, Encapsulation of low density plastic foam materials for the fast ignition realization experiment (FIREX) control of microstructure and density.
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