Thermal switch of oscillation frequency in Belousov–Zhabotinsky liquid marbles

Author:

Adamatzky Andrew1ORCID,Fullarton Claire1ORCID,Phillips Neil1,De Lacy Costello Ben12,Draper Thomas C.1ORCID

Affiliation:

1. Unconventional Computing Laboratory, Department of Computer Science and Creative Technologies, Centre for Research in Biosciences, University of the West of England, Bristol BS16 1QY, UK

2. Institute of Biosensing Technology, Centre for Research in Biosciences, University of the West of England, Bristol BS16 1QY, UK

Abstract

External control of oscillation dynamics in the Belousov–Zhabotinsky (BZ) reaction is important for many applications including encoding computing schemes. When considering the BZ reaction, there are limited studies dealing with thermal cycling, particularly cooling, for external control. Recently, liquid marbles (LMs) have been demonstrated as a means of confining the BZ reaction in a system containing a solid–liquid interface. BZ LMs were prepared by rolling 50 μl droplets in polyethylene (PE) powder. Oscillations of electrical potential differences within the marble were recorded by inserting a pair of electrodes through the LM powder coating into the BZ solution core. Electrical potential differences of up to 100 mV were observed with an average period of oscillation ca 44 s. BZ LMs were subsequently frozen to −1°C to observe changes in the frequency of electrical potential oscillations. The frequency of oscillations reduced upon freezing to 11 mHz cf. 23 mHz at ambient temperature. The oscillation frequency of the frozen BZ LM returned to 23 mHz upon warming to ambient temperature. Several cycles of frequency fluctuations were able to be achieved.

Funder

Engineering and Physical Sciences Research Council

Publisher

The Royal Society

Subject

Multidisciplinary

Reference62 articles.

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