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Thin shell aerogel fabrication for FIREX-I targets using high viscosity (phloroglucinol carboxylic acid)/formaldehyde solution

Published online by Cambridge University Press:  22 July 2008

H. Yang ,
K. Nagai ,
M. Nakai  and
T. Norimatsu
H. Yang
Affiliation:
Institute of Laser Engineering, Osaka University, Osaka, Japan
K. Nagai*
Affiliation:
Institute of Laser Engineering, Osaka University, Osaka, Japan
M. Nakai
Affiliation:
Institute of Laser Engineering, Osaka University, Osaka, Japan
T. Norimatsu
Affiliation:
Institute of Laser Engineering, Osaka University, Osaka, Japan
*
Address correspondence and reprint requests to: Keiji Nagai, Institute of Laser Engineering, Osaka University, Yamada Oka 2–6, Suita, Osaka, Japan. E-mail: [email protected]
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Abstract

Capsules with a thin aerogel shell were prepared by the OO/W/OI emulsion process. (Phloroglucinol carboxylic acid)/formaldehyde (PF) was used as the water phase (W) solution to form the shell of the capsule. PF is a linear polymer prepared from phloroglucinol carboxylic acid. The viscosity of the PF solution can reach a high level of 9×10−5 m2/s without gelation while resorcinol/formaldehyde (RF) gelates at ~3–4×10−5 m2/s. Using the viscous PF solution, capsule with a 17 µm gel shell was fabricated. This thickness satisfies the specification of the first phase of Fast Ignition Realization Experiment (FIREX-I) at Osaka University. When PF gel was extracted to remove the organic solvent, shrinkage of 9% occurred. The final density of the PF aerogel was 145 mg/cm3. Both the shell thickness and density can satisfy the specification of FIREX-I. The pore size of the PF aerogel was less than 100 nm while that of RF was 200–500 nm. The SEM showed that PF had particle-like foam structure while RF had fibrous-like foam structure.

Keywords

Fast ignitionLow densityThin shell thicknessFusion targetPhenol formaldehyde resin
Type
Research Article
Information
Laser and Particle Beams , Volume 26 , Issue 3 , September 2008 , pp. 449 - 453
Copyright
Copyright © Cambridge University Press 2008

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