Light from sonication of crystal slurries

Article Abstract:

Acoustic cavitation is used to obtain mechanoluminescence and find intense luminescence and emission lines that are not generated by other mechanisms such as grinding, cleaving, rubbing and thermal shock. Acoustic cavitation induces high-velocity collisions between suspended solid particles, which causes fracture of the crystallites and induces very high electric fields due to charge separation at the rapidly separating piezoelectric fracture faces, and the dielectric breakdown produces an electric discharge at the crystal surfaces.

Crystals, Crystal structure, Optical properties, Luminescence, Mechanical properties, Slurry, Slurries, Breakdown (Electricity)

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Plasma formation and temperature measurement during single-bubble cavitation

Article Abstract:

Observations of atomic (Ar) emission and extensive molecular (SO) and ionic [O(sub 2)(super 2+)] progressions in single-bubble sonoluminescence (SBSL) spectra from concentrated aqueous H(sub 2)SO(sub 4) solutions are reported. It is concluded that these emitting species must originate from collisions with high-energy electrons, ions or particles from a hot plasma core.

United States, Deuterium, Nuclear fusion, Sonoluminescence

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Sonoluminescence temperatures during multi-bubble cavitation

Article Abstract:

An experiment indicates that the emission temperature inside imploding cavitation bubbles is reliant on the thermal conductivity and the polytropic ratio of the bubble contents. During bubble collapse the identity of the bubble contents mutates as a cavitation bubble works as a small chemical reactor.

Cavitation, Bubbles

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