2013
DOI: 10.1299/jtst.8.448
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Diffusion in Microchannel Analyzed by Chemiluminescence

Abstract: We investigate diffusion and mixing in a microchannel by using luminol chemiluminescence (CL) to estimate the local chemical reaction rate. The degree of mixing in micromixers is generally evaluated from the deviation of concentration profiles measured by fluorescence from a uniform concentration profile. The degree of mixing measured by this method is a macroscopic estimate, which is inappropriate for investigating diffusion and mixing in microchannels. In this study, the luminol CL reaction is used to visual… Show more

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Cited by 2 publications
(2 citation statements)
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“…The present experiment detects photons from a chemiluminescence (CL) reaction, allowing at the same time the proof for the controlled formation of the liquid–liquid interface and the imaging of the chemical reaction kinetics. Our sample reaction is the oxidation of 5-amino-2,3-dihydro-1,4-phthalazinedione, known as luminol, which is oxidized by H 2 O 2 in the presence of a transition metal ion. , The reaction product is an electronically excited state of deprotonated 3-aminophthalic acid (AP*), which relaxes to the electronic ground state by emitting a blue photon. This reaction is thus well suited for the main purpose of the present study, fulfilling the requirements of being straight-forward to prepare, sufficiently fast to be observed here, and detectable with a common camera setup.…”
Section: Introductionmentioning
confidence: 99%
“…The present experiment detects photons from a chemiluminescence (CL) reaction, allowing at the same time the proof for the controlled formation of the liquid–liquid interface and the imaging of the chemical reaction kinetics. Our sample reaction is the oxidation of 5-amino-2,3-dihydro-1,4-phthalazinedione, known as luminol, which is oxidized by H 2 O 2 in the presence of a transition metal ion. , The reaction product is an electronically excited state of deprotonated 3-aminophthalic acid (AP*), which relaxes to the electronic ground state by emitting a blue photon. This reaction is thus well suited for the main purpose of the present study, fulfilling the requirements of being straight-forward to prepare, sufficiently fast to be observed here, and detectable with a common camera setup.…”
Section: Introductionmentioning
confidence: 99%
“…Our sample reaction is the oxidation of 5-amino-2,3-dihydro-1,4-phthalazinedione, known as luminol, which is oxidized by H 2 O 2 in the presence of a transition metal ion. 34,35 The reaction product is an electronically excited state of deprotonated 3-aminophthalic acid (AP * ) which relaxes to the electronic ground state by emitting a blue photon. [36][37][38] Injecting the principal reactants through individual jets yields a liquid flat-jet that luminesces exclusively where the liquids mix.…”
Section: Introductionmentioning
confidence: 99%