Greening the Blue Bottle

A DFT investigation of the blue bottle experiment:E∘half-cellanalysis of autoxidation catalysed by redox indicators

“…In essence, there were attempts to test new reducing agents [ 7 , 11 , 16 ] and indicators [ 7 , 8 ], to elucidate the mechanism and kinetics of the reactions [ 5 , 11 ] and to model the pattern formation [ 6 , 19 – 23 , 26 ]. Pattern formation may be comparable to the Belousov–Zhabotinsky [ 27 ] and the Briggs–Rauscher [ 28 ] reactions.…”

A new direct technique for visualizing and measuring gas–liquid mass transfer around bubbles moving in a straight millimetric square channel

“…For example, methylene blue is blue in the oxidized state but colourless in the reduced state. The wellknown "blue bottle" experiments use this property (Cook et al, 1994;Walter et al, 1997;Engerer and Gilbert Cook, 1999;Wellman and Noble, 2003). The main drawback when visualizing mass transfer using methylene blue is the slow kinetics of the reactions (Wellman and Noble, 2003).…”

“…The wellknown "blue bottle" experiments use this property (Cook et al, 1994;Walter et al, 1997;Engerer and Gilbert Cook, 1999;Wellman and Noble, 2003). The main drawback when visualizing mass transfer using methylene blue is the slow kinetics of the reactions (Wellman and Noble, 2003). Other redox dyes are available, such as indigo carmine or resazurin, which are, respectively, red and green, and blue and pink in their different forms.…”

Reaction Systems for Bubbly Flows

“…The colour of the dyes usually changes from colourless to an intense colour when oxidised or reduced. Methylene blue is blue when oxidised and colourless in the reduced state but has slow kinetics for fast reactions like a bubble rise , . Resazurin is a well‐known dye that changes colour from blue (not fluorescent) to pink resorufin (highly fluorescent) when reduced (Figure ) , .…”