Switchable Wettability and Adhesion of Micro/Nanostructured Elastomer Surface via Electric Field for Dynamic Liquid Droplet Manipulation

Li, Yan; Li, Jinrong; Liu, Liwu; Yan, Yongsheng; Zhang, Qiuya; Zhang, Na; He, Linlin; Liu, Yanju; Zhang, Xiaofang; Tian, Dongliang; Leng, Jinsong; Jiang, Lei

doi:10.1002/advs.202000772

Cited by 56 publications

(41 citation statements)

References 50 publications

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“…2d), the binding energies at 954.54 and 934.48 eV are identified as Cu 2p 1/2 and Cu 2p 3/2 , respectively. 35,36 Within the O 1s spectra, the three peaks at 531.5, 532.4 and 535.9 eV were attributed to the emission of O 2− , PO 4 3− and adsorbed H 2 O (Fig. 2e).…”

Section: Resultsmentioning

confidence: 98%

“…The fabrication of micro-and nanostructured surfaces with controllable wettability has attracted intensive attention due to their numerous applications ranging from self-cleaning to microfluidic tools to biomedicine. [1][2][3][4] In particular, the switching between superhydrophobicity and superhydrophilicity has been a focus of researchers. [5][6][7][8] It is well-known that the wettability of solid surfaces is governed by surface chemistry (chemical composition) and micro-morphology (surface roughness).…”

Section: Introductionmentioning

confidence: 99%

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Bioinspired self-cleaning surface with microflower-like structures constructed by electrochemically corrosion mediated self-assembly

Bao

et al. 2022

CrystEngComm

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Bioinspired self-cleaning surface with microflower-like structures constructed by electrochemically corrosion mediated self-assembly

Bao

et al. 2022

CrystEngComm

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“…Then various applications of DEAs are classified and discussed, including soft grippers, walking/crawling robots, jumping/flying, swimming robots, humanoid robots, tunable lens, and tactile displays. In addition, there are also some potential applications that are not described in detail here, such as micropumps, [178][179][180] vibration devices, [181] loudspeakers, [182,183] cell manipulation in biology, [184][185][186] dynamic liquid droplet manipulation, [187] etc. Beyond the application as actuators, DEs can also be used as energy harvesters and sensors.…”

Section: Discussionmentioning

confidence: 99%

Review of Dielectric Elastomer Actuators and Their Applications in Soft Robots

Guo

Liu

et al. 2021

Advanced Intelligent Systems

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136

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Robots play an increasingly important role in industrial production and daily life. Traditional robots are mostly made of hard materials, such as metal and plastic. Although rigidity of the material enables the traditional robot to perform tasks that are difficult for humans, for instance, carrying heavy objects, it also limits its adaptability. In nature, animals and plants are mostly made of soft materials, which make them have very high compliance and realize a variety of unimaginable actions. Similar to natural creatures, soft robots are usually composed of soft stimuli-responsive materials, which make them have good adaptability and compliance, and can achieve large deformation.Triggered by external stimuli, such as electric fields, magnetic fields, heat, and light, these soft stimuli-responsive materials can deform in a specific direction. The soft stimuli-responsive materials commonly used in soft robots include electroactive polymers (EAP), [1][2][3] hydrogels, [4][5][6][7] magnetic materials, [8][9][10] shape memory polymers (SMP), [11][12][13] shape memory alloys (SMA), [14,15] liquid crystal elastomers (LCE), [16][17][18] and so on. In addition, other actuation methods, such as pneumatic inflation and [19] electrostatic, [20,21] are also widely used in soft robots. To have an overview of different actuation methods, their performances with the maximum values are shown in Table 1. Although these maximum values were obtained from different actuators for each actuation method, they still demonstrate the potential upper limit.Dielectric elastomer (DE) is a typical EAP, which can generate significant deformation under the action of an external electric field. Thanks to its characteristics, such as large deformation, [22,23] fast response, [24,25] low elastic modulus, [2] high energy density, [26,27] light weight, [28,29] and low cost, [28] DE has the reputation of artificial muscles and has become one of the most promising materials in soft robots. [30][31][32][33][34] In this Review, we concentrate on the recent progresses of dielectric elastomer actuators (DEAs) and their application in soft robots. In Section 2, we first introduce the working principle of DEAs, followed by the DE materials and compliant electrodes. Then, various DEAs with different designs are introduced. In Section 3, the application of DEAs in soft robots is divided into seven categories. Some recent highlights are described and discussed in detail, especially those with biological inspiration. We summarize some of the challenges in Section 4 and this is followed with the conclusion in Section 5. Dielectric Elastomer Actuators Working PrincipleGenerally, the structure of a DEA is similar to a sandwich, consisting of a DE membrane, where both surfaces are coated with compliant electrodes, as shown in Figure 1a. Once the compliant electrodes are subjected to voltage, an electric field will be generated in the membrane. The induced Maxwell stress causes the membrane to expand its area and contract its thickness. Based on the mechanism of ...

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“…Moreover, a switch of the electric field can control the dynamic wettability. Li et al [69] reported a strategy for achieving controllable liquid manipulation and transportation on a micro-nano structured elastomer film via an electric field. Wettability is controlled according to the stretching/releasing of the elastomer TiO 2 surface.…”

Section: Controllable Wettabilitymentioning

confidence: 99%

Titanium Dioxide Derived Materials with Superwettability

et al. 2021

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Titanium dioxide (TiO2) is widely used in various fields both in daily life and industry owing to its excellent photoelectric properties and its induced superwettability. Over the past several decades, various methods have been reported to improve the wettability of TiO2 and plenty of practical applications have been developed. The TiO2-derived materials with different morphologies display a variety of functions including photocatalysis, self-cleaning, oil-water separation, etc. Herein, various functions and applications of TiO2 with superwettability are summarized and described in different sections. First, a brief introduction about the discovery of photoelectrodes made of TiO2 is revealed. The ultra-fast spreading behaviors on TiO2 are shown in the part of ultra-fast spreading with superwettability. The part of controllable wettability introduces the controllable wettability of TiO2-derived materials and their related applications. Recent developments of interfacial photocatalysis and photoelectrochemical reactions with TiO2 are presented in the part of interfacial photocatalysis and photoelectrochemical reactions. The part of nanochannels for ion rectification describes ion transportation in nanochannels based on TiO2-derived materials. In the final section, a brief conclusion and a future outlook based on the superwettability of TiO2 are shown.

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Switchable Wettability and Adhesion of Micro/Nanostructured Elastomer Surface via Electric Field for Dynamic Liquid Droplet Manipulation

Cited by 56 publications

References 50 publications

Bioinspired self-cleaning surface with microflower-like structures constructed by electrochemically corrosion mediated self-assembly

Bioinspired self-cleaning surface with microflower-like structures constructed by electrochemically corrosion mediated self-assembly

Review of Dielectric Elastomer Actuators and Their Applications in Soft Robots

Titanium Dioxide Derived Materials with Superwettability

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