| 講演要旨： |
Sonoluminescence (SL) is the light emission associated with the
catastrophic bubble collapse of micro bubble oscillating under an
ultrasonic field. However, the exact mechanism of the light emission
characterized by picosecond flashes of continuous spectrum has not
been identified, whether it is of thermal blackbody and/or
bremsstrahlung radiation origin. SL characteristics from a single
bubble such as pulse shape, spectrum radiance from micro and
submicron bubbles in water and a new paradigm of SL, which displays
alternating pattern of on/off luminescence pulse in sulfuric acid
solutions will be discussed with our hydrodynamic model. Molecular
dynamics (MD) simulation of a collapsing micro bubble in sulfuric
acid solutions and submicron bubble in water is discussed and the
simulation results are compared with the theoretical results which
are in good agreement with observed ones. Syntheses of specialty
nanoparticles such as ZnO powder used as reinforcing filler for
elastomer, various core/shell type nanocrystals such as ZnO and
ZnS-coated TiO2 nanoparticles, which are likely to be useful for
dye-sensitized solar cells and LTO
(Li4Ti5O12) used as an anode
materials for rechargeable lithium batteries at the multi-bubble
sonoluminescence condition are also discussed.
|
