Peristome‐Mimetic Curved Surface for Spontaneous and Directional Separation of Micro Water‐in‐Oil Drops

Li, Chuxin; Song, Yanlin; Yu, Cunlong; Dong, Zhichao; Jiang, Lei

doi:10.1002/anie.201706665

Cited by 96 publications

(105 citation statements)

References 41 publications

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“…Manipulated liquid transport is the cornerstone for a variety of biological processes and technical applications from microfluidics, bioassay, printing to oil–water separation technologies . Learning from nature, a versatile strategy of natural creatures involves making fluids flow on gradient surfaces, and examples including cactus, pitcher plant, and spider silk, can acquire or shield water droplets on their gradient surfaces for survival .…”

mentioning

confidence: 99%

Controllable High‐Speed Electrostatic Manipulation of Water Droplets on a Superhydrophobic Surface

et al. 2019

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Biological processes and technological applications cannot work without liquid control, where versatile water droplet manipulation is a significant issue. Droplet motion is conventionally manipulated by functionalizing the target surface or by utilizing additives in the droplet, still, with uncontrolled limitation on superhydrophobic surfaces since droplets are either unable to move fast or are difficult to stop while moving. A controllable high‐speed “all‐in‐one” no‐loss droplet manipulation, that is, in‐plane moving and stopping/pinning in any direction on a superhydrophobic surface, with electrostatic charging is demonstrated. The experimental results reveal that the transport speed can vary from zero to several hundreds of millimeters per second. Controlled dynamic switching between the onset moving state and the offset pinning state of a water droplet can be achieved by out‐of‐plane electrostatic charging. This work opens the possibility of droplet control techniques in various applications, such as combinatory chemistry, biochemical, and medical detection.

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confidence: 99%

Controllable High‐Speed Electrostatic Manipulation of Water Droplets on a Superhydrophobic Surface

et al. 2019

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“…Anisotropic wetting occurs when liquid contact line encounters physical discontinuity and chemical heterogeneity present on solid surfaces. In recent years, anisotropic wetting micro‐/nanostructures have attracted wide scientific attention for practical applications, such as microfluidics, fog harvesting, and oil–water separation . The anisotropic wetting structures are usually integrated into microfluidic chips in two manners: when the anisotropic wetting structures are arranged in a single microchannel, they induce different P L of fluid when the flow direction is along and against the anisotropic wetting direction; when the anisotropic wetting structures are arranged in different branch channels that connect a main channel, the liquid flow has direction specificity when it is transported from the main channel to branch channels due to the different P L of fluid.…”

Section: Inner Surface Design Of Microchannelsmentioning

confidence: 99%

Inner Surface Design of Functional Microchannels for Microscale Flow Control

Wang

Yang

et al. 2019

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Fluidic flow behaviors in microfluidics are dominated by the interfaces created between the fluids and the inner surface walls of microchannels. Microchannel inner surface designs, including the surface chemical modification, and the construction of micro‐/nanostructures, are good examples of manipulating those interfaces between liquids and surfaces through tuning the chemical and physical properties of the inner walls of the microchannel. Therefore, the microchannel inner surface design plays critical roles in regulating microflows to enhance the capabilities of microfluidic systems for various applications. Most recently, the rapid progresses in micro‐/nanofabrication technologies and fundamental materials have also made it possible to integrate increasingly complex chemical and physical surface modification strategies with the preparation of microchannels in microfluidics. Besides, a wave of researches focusing on the ideas of using liquids as dynamic surface materials is identified, and the unique characteristics endowed with liquid–liquid interfaces have revealed that the interesting phenomena can extend the scope of interfacial interactions determining microflow behaviors. This review extensively discusses the microchannel inner surface designs for microflow control, especially evaluates them from the perspectives of the interfaces resulting from the inner surface designs. In addition, prospective opportunities for the development of surface designs of microchannels, and their applications are provided with the potential to attract scientific interest in areas related to the rapid development and applications of various microchannel systems.

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“…Directional transport of liquids on solid surfaces has received particular attention over the past few years. They are highly desired in various settings that range from microfluidics, printing, and water harvesting technologies to oil–water separation 1–8. Millions of years of evolution have endowed the nature with many powerful and efficient capabilities such as directional water collection on wetted spider silk,9 fog collection in cactus,10 directional water transport on the peristome surface of Nepenthes alata ,11 ultrafast fog harvesting of the Sarracenia trichome 4.…”

Section: Introductionmentioning

confidence: 99%

Droplets Crawling on Peristome‐Mimetic Surfaces

Zhou

et al. 2020

Adv Funct Materials

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Controlling the mobility of liquids along surfaces is widely exploited in various technologies to achieve self‐lubrication, phase‐change heat transfer, and microfluidics. Despite commendable progress in directional liquid transport on peristome‐mimetic surfaces, liquid merely spreads directionally with a wetted trail remaining. It is a challenge to achieve directional contracting of spreading liquid at the rear side and ultimately unidirectional motion in bulk from one site to another. Here it is shown that liquids resting on the peristome‐mimetic surfaces can crawl directionally and rapidly in an inchworms‐like way under the action of sudden spontaneous bubbles levitation. Vacuuming or chemical reaction induces sudden nucleation, growth, coalescence (Ostwald ripening process), and rupture of bubbles in the asymmetric microcavities of the peristome‐mimetic surface with directional overpressure beneath the liquid, resulting in the guided contracting and spreading of the liquid. Bubbles regulate this new mode of liquid directional motion. The strategy offers opportunities for liquids directional motion for various applications, such as in microfluidic devices, oil–water separation, and water collection systems.

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Peristome‐Mimetic Curved Surface for Spontaneous and Directional Separation of Micro Water‐in‐Oil Drops

Cited by 96 publications

References 41 publications

Controllable High‐Speed Electrostatic Manipulation of Water Droplets on a Superhydrophobic Surface

Controllable High‐Speed Electrostatic Manipulation of Water Droplets on a Superhydrophobic Surface

Inner Surface Design of Functional Microchannels for Microscale Flow Control

Droplets Crawling on Peristome‐Mimetic Surfaces

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