Method and means for producing solid evacuated microspheres of h

Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – By vibration or agitation

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176 1, 2523011R, 264 5, 264 28, C01B 400

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039858413

ABSTRACT:
A method is provided for producing solid, evacuated microspheres comprised of hydrogen. The spheres are produced by forming a jet of liquid hydrogen and exciting mechanical waves on the jet of appropriate frequency so that the jet breaks up into drops with a bubble formed in each drop by cavitation. The drops are exposed to a pressure less than the vapor pressure of the liquid hydrogen so that the bubble which is formed within each drop expands. The drops which contain bubbles are exposed to an environment having a pressure just below the triple point of liquid hydrogen and they thereby freeze giving solid, evacuated spheres of hydrogen.

REFERENCES:
hendricks, C. D., "Program to Develop the Techniques of Generation and Control of Cryogenic Material Particles for Use on Fusion Systems", c00-2234-1.
Clark et al. "Laser-Driven Implosion... Condition", Physical Review Letters, vol. 30, No. 3, (Jan. 15, 1973), pp. 89-92.
Nuclear Science Abstracts, vol. 30. No. 18447, (Oct. 1974).

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