Thermal switch of oscillation frequency in Belousov–Zhabotinsky liquid marbles

Adamatzky, Andrew; Fullarton, Claire; Phillips, Neil; Costello, Ben de Lacy; Draper, Thomas C.

doi:10.1098/rsos.190078

Cited by 23 publications

(20 citation statements)

References 58 publications

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“…[23][24][25][26]. Use of liquid marbles for non-traditional computing was reported recently [27][28][29][30]. Liquid marbles may be actuated by UV and IR light and Marangoni flows [31][32][33], and demonstrate obvious potential for micro-fluidics applications [34][35].…”

Section: Introductionmentioning

confidence: 99%

Interfacial Crystallization within Liquid Marbles

Bormashenko¹,

Roy²,

Shoval³

et al. 2020

Preprint

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We report interfacial crystallization in droplets of saline solutions placed on superhydrophobic surfaces and liquid marbles filled with the saline. Evaporation of saline droplets deposited on superhydrophobic surface resulted in the formation of cup-shaped millimeter-scaled residues. The formation of the cup-like deposit is reasonably explained within the framework of the theory of the coffee-stain effect, namely, the rate of heterogeneous crystallization along the contact line of the droplet is many times higher than in the droplet bulk. Crystallization within evaporated saline marbles, coated with lycopodium particles, depends strongly on the evaporation rate. Rapidly evaporated saline marbles yielded dented shells built of a mixture of colloidal particles and NaCl crystals. We relate the formation of these shells to the interfacial crystallization promoted by hydrophobic particles coating the marbles, accompanied with the upward convection flows supplying the saline to the particles, serving as the centers of interfacial crystallization. Convective flows prevail over the diffusion mass transport for the saline marbles heated from below.

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Section: Introductionmentioning

confidence: 99%

Interfacial Crystallization within Liquid Marbles

Bormashenko¹,

Roy²,

Shoval³

et al. 2020

Preprint

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“…The oxidation of an organic substrate, e.g. malonic acid by bromate ions in acidic medium in the presence of a single-electron transfer metal ion redox catalyst like ferroin, typically known as Belousov-Zhabotinsky reaction [25], has also been reported [26,27] in liquid marbles.…”

Section: Introductionmentioning

confidence: 99%

Liquid marbles as microreactors for qualitative and quantitative inorganic analyses

et al. 2020

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Conventional qualitative analysis of ions from inorganic salts and acid-base and redox titrations require relatively large volumes of solution and hence require more reagent and generate relatively large amount of waste. Liquid marbles can be used to cut down the volume of solution and by extension the amount of reagent and volume of waste generated. Liquid marbles were used for qualitative analysis of ions from inorganic salt solutions and acid-base and redox titrations. This was compared with the conventional methods which require milliliters of solution. Fumed silica or fluorinated sericite clay particles of varying degrees of hydrophobicity were used to prepare the marbles. A drop of a test reagent was then placed on the marble, merging with it and initiating a chemical reaction. The characteristic reactions between a salt solution and a test reagent in the marbles were observed provided the reaction was clearly marked by a color change. Concentrations, calculated from the volume at the end-point, compared closely (p ≤ 0.05) with the known ones as well as those calculated from the bulk titration method that requires milliliters of solution. This indicates that the liquid marble method which rather requires microliters of solutions is reliable. These findings are especially important in microfluidics which utilizes microliters of solutions.

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“…To overcome this limitation, we proposed to measure oscillations of electrical potential, caused by oxidation wave-fronts by inserting electrodes in the BZ medium-filled LMs. We previously made a prototype BZ marble thermal sensor [2] and demonstrated that it is possible to reduce the frequency of oscillations or even completely halt oscillations by 'freezing' them. This method is robust, but requires Peltier elements and, therefore, lacks the scalability demanded from a computational viewpoint.…”

Section: Introductionmentioning

confidence: 99%

Liquid Marble Photosensor

et al. 2019

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A liquid marble is a liquid droplet coated by a hydrophobic power. The liquid marble does not wet adjacent surfaces and therefore can be manipulated as a dry soft body. A Belousov-Zhabotinsky (BZ) reaction is an oscillatory chemical reaction exhibiting waves of oxidation. We demonstrate how to make a photo-sensor from BZ medium liquid marbles. We insert electrodes into a liquid marble, prepared from BZ solution and coated with polyethylene powder. The electrodes record a potential difference which oscillates due to oxidation wave-fronts crossing the electrodes. When the BZ marble is illuminated by a light source, the oxidation wave-fronts are hindered and, thus, the electrical potential recorded ceases to oscillate. We characterise several types of responses of BZ marble photosensors to various stimuli, and provide explanations of the recorded activity. BZ liquid marble photosensors may find applications in the fields of liquid electronics, soft robotics and unconventional computing.

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Thermal switch of oscillation frequency in Belousov–Zhabotinsky liquid marbles

Cited by 23 publications

References 58 publications

Interfacial Crystallization within Liquid Marbles

Interfacial Crystallization within Liquid Marbles

Liquid marbles as microreactors for qualitative and quantitative inorganic analyses

Liquid Marble Photosensor

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