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Laser-induced phase separation dynamics of binary liquid systems and the application of dynamic solvents as reaction fields

le 8 septembre 2014
11h00

Séminaire, du Professeur Hiroshi Fukumura (Tohoku University, Sendai, Japon) à l'invitation du PPSM.

Hiroshi Fukumura

Hiroshi Fukumura

Le Professeur Hiroshi Fukumura donnera un séminaire intitulé:
"Laser-induced phase separation dynamics of binary liquid systems and the application of dynamic solvents as reaction fields "

le lundi 8 Septembre 2014 à 11h00 (Auditorium D. Chemla - Bâtiment IDA)

Résumé:
Some mixtures of water and organic solvents show phase separation by temperature rise. Water molecules can be vibrationally excited with infrared laser pulses, which initiates fast phase separation of binary mixtures. The dynamics of such phase separation was monitored with time-resolved Raman spectroscopy and nanosecond microscopic imaging. It was found that C-H vibration modes of organic molecules were sensitive to inter-molecular hydrogen bonds and thus were useful to study phase separation dynamics from a molecular viewpoint. The growth rates of micro-droplets in liquids followed scaling laws, which enabled us to deduce the initial size of liquid structures to be about 70 nm at 1 microsecond. The origin of co-operative motion of molecules during phase separation will be discussed. Examples of chemical reactions during phase separation will be also presented.
Type :
Séminaires - conférences
Contact :
Robert Pansu
Lieu(x) :
Campus de Cachan
Auditorium D. Chemla - Bâtiment IDA

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