BZ reaction Film/installation detail, Enter
3, Mutamorphosis 2007, Prauge.|
reaction (or BZ reaction) is performed using a mixture of
sodium bromate, malonic acid, sulphuric acid, and ferroin.
This creates a complex oxidising reaction that changes colour
periodically. The oscillations start with the formation in
a red solution of small blue dots that expand into ever-widening
concentric blue rings. Sometimes these will become expanding
Archimedean spirals; the patterns intermix and become increasingly
complex towards the end of the reaction. These waves are
not mechanical in the same sense a ripple can be considered;
instead these waves show information traveling.
reaction was discovered in 1951, but more recently the
reaction has been used to study the possibly applications
of liquid computers using chemical waves.
mixture we used was;
* Malonic Acid - 0.2 M/L
* Sodium Bromate - 0.3 M/L
* Sulfuric Acid - 0.3 M/L
* Ferroin - 0.005 M/L
Spiral Patterns have been observed in dishes of social
amoebae in a slime mould. Individual cells communicate
in spiral waves at a certain stage in their life cycles
when they synthesise and hoard molecules of a hormone
called cAMP, to be suddenly released in an abrupt ‘sneeze’.
Professor Winfree suggests that this cAMP diffusion is
perhaps in effect "a living fossil replaying events
that were common during evolution from unicellular to
multi cellular organisms two billion years ago".
The spirals rotate at about the same period as the chemical
wave in the B-Z reaction, with about the same speed and
spacing. The tiny rotating source at the core of a spiral
wave is called a ‘rotor’, and the term ‘pacemaker’refers
to the variably longer-period sources of concentric ring
the BZ reaction (BZR) is?
Analysis of the Belousov-Zhabotinskii Reaction
Phenomenology of the Belousov-Zhabotinsky Reaction*http://www.hermetic.ch/pca/bz.htm
Computer simulations, which allow exploration of five different cellular
automata "All of them use a 2-dimensional array of cells which can vary
in size from 33x33 to 528x528. "Periodic boundary conditions" are
used, meaning that the left edge of the array wraps around to contact the
right edge, and the top edge of the array wraps around to contact the bottom
edge. The structure is thus that of a tours, although it is easier to think
of a 2-dimensional plane in which an unlimited number of copies of the square
array are reproduced next to, and above and below, each other (and each copy
changes in the same way)."