Three-dimensional topographies of water surface dimples formed by superhydrophobic water strider legs

Yin, Wei; Zheng, Yelong; Lu, Hongyu; Zhang, X. J.; Tian, Yu

doi:10.1063/1.4964788

Cited by 26 publications

(16 citation statements)

References 53 publications

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“…Atomic-Like Motion of Oil Drops. When a small amount of carbon tetrachloride (CCl 4 ) liquid dyed with a biological stain was dropped on the surface of an ethanol and DI water mixture (the drops float at the air−liquid interface which is mainly because of surface tension and buoyancy 17,18 ), we found that the CCl 4 liquid forms lens shaped drops at the air−liquid interface. In general, the dropped liquid can spread out or form a drop, and its behavior depends on the spreading parameter.…”

Section: Resultsmentioning

confidence: 99%

Life-Like Motion of Oil Drops at the Air–Liquid Interface

et al. 2019

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Generally, interactions of oil drops at the air–liquid interface mainly have two features, namely, attraction and repulsion. However, in our study, we find that the oil drops at the air–liquid interface have other interacting features, that is, the atomic-like motion and the “capture” motion. For the atomic-like motion, oil drops attract each other at a long distance, but repel when they are about to come into contact with each other. For the “capture” motion, a big oil drop can actively “capture” oil droplets like a zooplankton. In our research, we analyze interfacial forces among the oil drops. Based on the experiments and analyses, we demonstrate that the atomic-like motion of oil drops is mainly due to the lateral capillary force and the surface tension force, and the “capture” motion is mainly due to the unbalanced impact force of flow fluid around the drops. In addition, based on our results, we use the oil drops to perform many functions at the air–liquid interface. For example, the oil drops can drive an object with linear and rotational motion. When a carbon tetrachloride drop is suspended above the air–liquid interface, it can be used to control an oil droplet to pass through serpentine grooves and obstacles. In addition, the suspended carbon tetrachloride drops also can be used to rank multiple droplets with a special shape. Based on the results, our study makes it possible to use oil drops to transport materials, drive objects, and even collect droplets at the air–liquid interface.

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Section: Resultsmentioning

confidence: 99%

Life-Like Motion of Oil Drops at the Air–Liquid Interface

et al. 2019

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“…When the density of the plate is smaller than that of the solution, the plate can float at the air–liquid interface. However, for a plate with a larger density than that of the liquid, due to buoyancy and surface tension, the plate can also float on the surface without sinking . Hence, a plate with a larger density than that of the liquid solution also can be transported and controlled by our method.…”

Section: Methodsmentioning

confidence: 99%

“…However, for a plate with a larger density than that of the liquid, due to buoyancy and surface tension, 14 the plate can also float on the surface without sinking. 15 Hence, a plate with a larger density than that of the liquid solution also can be transported and controlled by our method. The liquid marble is a type of liquid drop stabilized by solid powders at the surface.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Vapor-Driven Transport of Different Types of Objects at the Air–Liquid Interface

et al. 2019

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Transportation and position control of objects on the surface of liquids is an important part of automation. To drive an object on the surface of a liquid, many methods have been proposed. However, these methods mainly focus on the driving of the object itself, and it is still difficult to precisely control its position. In our study, we propose a new method that uses vapor released from a suspended drop to achieve precise position control and transport of different types of objects at the air−liquid interface. These objects can be a plastic plate, a liquid marble, or an oil drop. The mechanism for controlling objects is that vapor released from a suspended drop causes a surface tension gradient around the object. When the vapor dissolves on the surface of a liquid, the surface tension of the liquid increases. Due to the surface tension gradient, the object moves from the surrounding area to the area below the suspended drop and follows the motion of the suspended drop with the trajectory of a letter. To show that the position of the objects can be precisely controlled by our method, we control the object on the center of a circle, and the maximum offset distance from the center of the circle is less than 3 mm. In addition, we also use vapor released from a suspended drop to transport an oil drop close to an object. After the drop adhered with the object, the object is driven by the oil drop. Compared with other methods that drive the motion of objects by reducing the surface tension of a liquid, our method is easy and the position of objects can be precisely controlled.

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“…Yeh's groups adopted Xanthosoma sagittifolium leaves with a WCA of 146° as templates to prepare a superhydrophobic surface showing a WCA of 153° on a cold‐rolled steel substrate using nanocasting techniques. [ 49,50 ] In addition, Chen et al [ 51 ] fabricated a superhydrophobic surface through the solvothermal method and self‐assembly functionalization. Resembling the lotus leaf, the fabricated superhydrophobic surface possesses hierarchical micro/nano structures.…”

Section: Superhydrophobic Surfacesmentioning

confidence: 99%