A flat-jet exhibiting blue luminescence due to the oxidation of Luminol. The photograph depicts the leaves formed through the crossing of two liquid microjets, flowing from left to right, and shows that the first leaf is characterised by laminar flow. As a consequence, a liquid-liquid interface is formed which can be used to measure chemical kinetics. Credit: A. Osterwalder (EPFL)
A flat-jet exhibiting blue luminescence due to the oxidation of Luminol. The photograph depicts the leaves formed through the crossing of two liquid microjets, flowing from left to right, and shows that the first leaf is characterised by laminar flow. As a consequence, a liquid-liquid interface is formed which can be used to measure chemical kinetics. Credit: A. Osterwalder (EPFL) - Scientists led by EPFL have developed a new method to measure chemical kinetics by imaging progress of a reaction at a liquid-liquid interface embedded in a laminar-flow liquid microjet. This method is ideal for studies of dynamics on the sub-millisecond timescale, which is very difficult to do with current applications. "It is a new application of so-called water flat-jets," says Andreas Osterwalder at EPFL's School of Basic Sciences. "We prepare a controlled interface between two aqueous solutions and use it to measure chemical kinetics." Free-flowing liquid microjets allow chemists to create a controllable smooth (and in some cases flat) surface of a liquid that can be used for surface scattering or spectroscopy studies.
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