Energy conversion based on superhydrophobic surfaces

Yang, Chen; Liu, Jiyu; Song, Jinlong; Li, Rui; Zhao, Danyang; Hua, Shungang; Lu, Yao

doi:10.1039/d0cp04257a

Cited by 8 publications

(6 citation statements)

References 93 publications

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“…The separation of droplets after impacting solid surfaces is crucial for certain applications, such as energy harvesting, 1 heat transfer, 2 surface self‐cleaning, 3 and so on 4 . To achieve the solid–liquid separation, different strategies including surface superhydrophobic treatment, 5 pneumatic programmable surface, 6 preimpregnated oil films, 7 and external physical fields 8 of vibration 9 have been proposed. Although letting droplets bounce off surfaces is very intuitive, they would still fall back to surfaces.…”

Section: Introductionmentioning

confidence: 99%

Controllable self‐transport of bouncing droplets on ultraslippery surfaces with wedge‐shaped grooves

Yue,

Dai,

Yang

et al. 2024

Droplet

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Preventing the accretion of droplets on surfaces is vital and slippery liquid‐infused porous surfaces (SLIPS) have promising application prospects, such as surface self‐cleaning and droplet transportation. In this work, controllable self‐transport of bouncing droplets on ultraslippery surfaces with wedge‐shaped grooves is reported. The impact behaviors of droplets on SLIPS under various impact velocities and diameters are explored, which can be classified as hover, total bounce, partial bounce, Worthington jet, and crush. SLIPS with wedge‐shaped grooves were designed to transport accreted droplets. An energy and transport model is established to explain the impact and self‐transport mechanism, where the Laplace pressure and moving resistance between droplets play a key role. Finally, SLIPS with branched wedge‐shaped grooves were designed for droplet self‐transport and demonstrated advantages. This work provides a general reference for spontaneous motion control of sessile droplets, droplets with initial impacting velocity, or even liquid films.

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Section: Introductionmentioning

confidence: 99%

Controllable self‐transport of bouncing droplets on ultraslippery surfaces with wedge‐shaped grooves

Yue,

Dai,

Yang

et al. 2024

Droplet

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“…And the diverse conversion of surface energy, kinetic energy, and electric energy based on extreme wettability surfaces has attracted ever‐growing interest. [ 4–8 ]…”

Section: Introductionmentioning

confidence: 99%

“…And the diverse conversion of surface energy, kinetic energy, and electric energy based on extreme wettability surfaces has attracted ever-growing interest. [4][5][6][7][8] morphology engineering by modulating laser parameters, [28,29] adjusting the composition of precursor, [26,30] and integrating with hydrophobic/hydrophilic materials. [31,32] Although laser processing yields fine control over wettability, information about the durability of the wetting states is insufficient, which is one of the most important factors determining its practical application.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the surface with spatially controlled wettability has become a critical demand due to the fact that the high wettability contrast provides the driving force for energy conversion. [2,5,7,20,21] For instance, the well-designed spiral-patterned wettability has enabled the transformation of translational motion of an impacting droplet to gyration, causing the substrate to rotate. [21] However, within the methods reported, the shadow-masking is needed for patterned wettability, and it is difficult to achieve the precisely controlled wettability transition as well as the high degree of customizable patterns.Tour reported the simultaneous fabrication and patterning of graphene by irradiating commercial polyimide using a CO 2 infrared laser under ambient conditions.…”

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confidence: 99%

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Wettability Controlled Surface for Energy Conversion

Zhao

Jiang

Wang

et al. 2022

Small

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To achieve clean and high‐efficiency utilization of renewable energy, functional surfaces with controllable and patternable wettability are becoming a fast‐growing research focus. In this work, a laser scribing strategy to fabricate patterned graphene surfaces that are capable of energy conversion in different forms is demonstrated. Using the laser raster‐scanning and vector‐scanning modes, two distinct surface structures are constructed on polybenzoxazine substrate, yielding a superhydrophilic (LSHL) surface and superhydrophobic (LSHB) surface, respectively. Of particular note is that the unique hierarchical structure of LSHB surface has endowed it with quite a robust superwetting behaviors. Further profiting from the flexibility of the processing method, wettability patterns with spatially resolved LSHL and LSHB regions are designed, achieving the conversion of surface energy to liquid kinetic energy. This also offers a tractable approach to fabricate wettability‐engineered devices that enable the directional, pumpless transport of water by capillary pressure gradient and the selective surface cooling via jet impingement. In addition, the LSHB surface demonstrates the high conversion of electric‐to‐thermal energy (222 °C cm2 W−1) and light‐to‐thermal energy (88%). Overall, the material system and processing method present a promising step forward to developing easy‐fabricated graphene surfaces with spatially controlled wettability for efficient energy utilization and conversion.

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“…For metallic substrates, besides corrosion, which is an extremely important issue for several applications of metals (i.e., naval, aircrafts, buildings, automobile), superhydrophobicity can enable additional functionalities such as anti-icing [24], dropwise condensation [25], frictionless motion, energy conversion [26], etc. Superhydrophobic interfaces in metals are typically prepared following two approaches (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

A Review of Fabrication Methods, Properties and Applications of Superhydrophobic Metals

et al. 2021

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Hydrophobicity and superhydrophobicity with self-cleaning properties are well-known characteristics of several natural surfaces, such as the leaves of the sacred lotus plant (Nelumbo nucifera). To achieve a superhydrophobic state, micro- and nanometer scale topography should be realized on a low surface energy material, or a low surface energy coating should be deposited on top of the micro-nano topography if the material is inherently hydrophilic. Tailoring the surface chemistry and topography to control the wetting properties between extreme wetting states enables a palette of functionalities, such as self-cleaning, antifogging, anti-biofouling etc. A variety of surface topographies have been realized in polymers, ceramics, and metals. Metallic surfaces are particularly important in several engineering applications (e.g., naval, aircrafts, buildings, automobile) and their transformation to superhydrophobic can provide additional functionalities, such as corrosion protection, drag reduction, and anti-icing properties. This review paper focuses on the recent advances on superhydrophobic metals and alloys which can be applicable in real life applications and aims to provide an overview of the most promising methods to achieve sustainable superhydrophobicity.

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Energy conversion based on superhydrophobic surfaces

Abstract: Covering about 70% of the earth’s surface, water contains considerable energy that remains unexploited. Superhydrophobic surface (SHS) possesses excellent water repellency, and the energy conversion based on SHS has opened...

Cited by 8 publications

References 93 publications

Controllable self‐transport of bouncing droplets on ultraslippery surfaces with wedge‐shaped grooves

Controllable self‐transport of bouncing droplets on ultraslippery surfaces with wedge‐shaped grooves

Wettability Controlled Surface for Energy Conversion

A Review of Fabrication Methods, Properties and Applications of Superhydrophobic Metals

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