2021
DOI: 10.1021/acs.langmuir.1c00455
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Spontaneous Motion and Rotation of Acid Droplets on the Surface of a Liquid Metal

Abstract: Self-propulsion of droplets is of great significance in many fields. The spontaneous horizontal motion and self-jumping of droplets have been well realized in various ways. However, there is still a lack of an effective method to enable a droplet to rotate spontaneously and steadily. In this paper, by employing an acid droplet and a liquid metal, the spontaneous and steady rotation of droplets is achieved. For an acid droplet, it may spontaneously move when it is deposited on the surface of the liquid metal. B… Show more

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Cited by 9 publications
(7 citation statements)
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“…Spontaneous spinning of a dichloromethane drop on an aqueous surfactant solution 1. Introduction 'Active' drops are simple fluid systems, consisting most often of two immiscible or partially miscible fluids and a surfactant, that exhibit remarkably rich and diverse dynamics, such as spontaneous translation (1; 2; 3; 4; 5), rotation (6), repeated pulsations (7; 8; 9), emission of satellite droplets (7; 10; 9), etc. In all cases, some mass transfer takes place, owing to diffusion, advection, evaporation or dissolution, so that the drop modifies the local properties of its surroundings, especially the interfacial tensions involved.…”
Section: Graphical Abstractmentioning
confidence: 99%
See 1 more Smart Citation
“…Spontaneous spinning of a dichloromethane drop on an aqueous surfactant solution 1. Introduction 'Active' drops are simple fluid systems, consisting most often of two immiscible or partially miscible fluids and a surfactant, that exhibit remarkably rich and diverse dynamics, such as spontaneous translation (1; 2; 3; 4; 5), rotation (6), repeated pulsations (7; 8; 9), emission of satellite droplets (7; 10; 9), etc. In all cases, some mass transfer takes place, owing to diffusion, advection, evaporation or dissolution, so that the drop modifies the local properties of its surroundings, especially the interfacial tensions involved.…”
Section: Graphical Abstractmentioning
confidence: 99%
“…Few examples of spontaneously spinning drops have been reported so far. One of such systems involves a sulfuric acid drop deposited on a liquid metal substrate made of a mixture of indium and gallium (6). A chemical reaction between the acid and the bath takes place when the drop is released, generating a ring of microbubbles along the contact line.…”
Section: Graphical Abstractmentioning
confidence: 99%
“…Other groups also investigate the vertical jumping of LM droplets in an electrolyte controlled by electrochemical oxidation and reduction; 33,34 such a method only allows instant vertical movement without the ability to provide continuous and precise 3D actuation. Moreover, by employing an acid droplet and liquid metal, the spontaneous and steady rotation of droplets is achieved, 35,36 which provides a new route for the design of potential applications (e.g., micro-and nanodevices).…”
Section: Introductionmentioning
confidence: 99%
“…Compared with solid conductive substrates, such as copper, liquid metals allow the fabrication of conductive structures, at milli, micron, and sub-micron scales, that can be flexible, stretchable, and deformable while retaining its conductivity. Recent research shows that gallium-based liquid metals have been used to develop soft flexible and stretchable electronics, , radio-frequency (RF) antennas, switches, rotating liquid drops, , frequency selective surfaces, three-dimensional (3D)-printed structures, and composites. …”
Section: Introductionmentioning
confidence: 99%