TY - JOUR
T1 - Nanosecond photo-fusion of microcrystals on a polymer film observed with time-resolved ultramicroscopy
AU - Saitow, Ken Ichi
AU - Banjo, Hiromi
AU - Ichinose, Nobuyuki
AU - Kawanishi, Shunichi
AU - Masuhara, Hiroshi
AU - Fukumura, Hiroshi
N1 - Funding Information:
We thank Marubun Corporation (Tokyo, Japan) and La Vision GMBH (Göttingen, Germany) for generously providing the PicoStar ultrafast time-gated CCD camera. HF thanks Dr. Jonathan Hobley (Tohoku University) for valuable discussion and helpful comments on the manuscript. This work was partly supported by a Grant-in-Aid for Scientific Research (A)(2) from the Japanese Ministry of Education, Science, Sports and Culture (11355035).
PY - 2001/12/3
Y1 - 2001/12/3
N2 - A time-resolved ultramicroscope was developed to monitor the process of pulse-laser-induced melting of 9,10-dicyanoanthracene microcrystals on poly(ethyl methacrylate) films. The microscope can detect sub-micrometer particles, but with an image (spacial) resolution of 2μm and a time resolution of 400ps. Quantitative comparison between images obtained at a certain time delay after an excitation laser pulse and a pre-irradiated image is achieved using a correlation function. It was found that crystals having a size of about 10μm turn in hot liquid droplets within the nanosecond excitation pulse after which 80% of the droplets solidify with a time constant of 9ns. The residual 20% of hot liquid droplets appear to have either evaporated or fused and dispersed into the polymer with a time constant of 15ns.
AB - A time-resolved ultramicroscope was developed to monitor the process of pulse-laser-induced melting of 9,10-dicyanoanthracene microcrystals on poly(ethyl methacrylate) films. The microscope can detect sub-micrometer particles, but with an image (spacial) resolution of 2μm and a time resolution of 400ps. Quantitative comparison between images obtained at a certain time delay after an excitation laser pulse and a pre-irradiated image is achieved using a correlation function. It was found that crystals having a size of about 10μm turn in hot liquid droplets within the nanosecond excitation pulse after which 80% of the droplets solidify with a time constant of 9ns. The residual 20% of hot liquid droplets appear to have either evaporated or fused and dispersed into the polymer with a time constant of 15ns.
KW - Laser-induced melting
KW - Nanosecond photo-fusion
KW - Time-resolved ultramicroscope
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U2 - 10.1016/S1010-6030(01)00578-0
DO - 10.1016/S1010-6030(01)00578-0
M3 - Article
AN - SCOPUS:0041367220
SN - 1010-6030
VL - 145
SP - 159
EP - 164
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 3
ER -