Credit: TED KINSMAN/SCIENCE PHOTO LIBRARY

Caption: Time-Lapse sequence showing chemical waves in a Belousov-Zhabotinsky (BZ) reagent. This is a well-mixed solution of citric acid, potassium bromate and a cerium sulphate catalyst. If the local relative concentrations in the reagent are altered, for example, by the impact of a dust particle on the surface, the equilibrium of the reaction is disturbed. The reaction then oscillates between oxidation and reduction. The oscillation propagates through the solution as a concentration front (yellow lines), caused by the dynamic coupling between the propagation rate of the reaction and the rates of diffusion of the reagents. Such chemical waves may be modelled using chaos mathematics.

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Keywords: belousov zhabotinskii, belousov-zhabotinsky, bz, catalyst, cerium sulphate, chemical, chemical reaction, chemical wave, chemistry, citric acid, concentration, natural pattern, oxidation, pattern, petri dish, potassium bromate, reaction, reagent, reduction

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BZ reaction

K005/0899 Rights Managed

Downloadable master

Duration: 00:00:30

Frame size: 1920x1080

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 590.3M

Original

Capture format: Digital Image Sequence

Codec: Animation

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