Laser-Induced fluorinated graphene for superhydrophobic surfaces with anisotropic wetting and switchable adhesion

Nam, Ki-Ho; Abdulhafez, Moataz; Tomaraei, Golnaz Najaf; Bedewy, Mostafa

doi:10.1016/j.apsusc.2021.151339

Cited by 23 publications

(10 citation statements)

References 78 publications

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“…The conversion of electrical-to-thermal energy, also known as Joule heating, is one of the main heat sources in various applications. [30,32,50] Figure 6d displays the detailed information related to the electrothermal conversion of LSHB surface. By applying a constant voltage at the two ends, the surface temperature rises rapidly then reaches the plateau, and uniform heat distribution across the surface is observed.…”

Section: Resultsmentioning

confidence: 99%

“…This offers great opportunities for its applications in energy storage devices, [ 22,23 ] sensors, [ 24,25 ] and triboelectric nanogenerators. [ 2,26 ] To tune the wettability of LIG, various strategies have been developed including changing gas atmosphere, [ 27 ] surface 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%

“…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%

See 2 more Smart Citations

Wettability Controlled Surface for Energy Conversion

Zhao

Jiang

Wang

et al. 2022

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wettability Controlled Surface for Energy Conversion

Zhao

Jiang

Wang

et al. 2022

Small

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“…In situ or post treatment by external processes, such as laser etching and machine pressing could be used to generate superhydrophobic surfaces with tunable adhesion. For example, Nam et al [94] prepared a fluorinated graphene superhydrophobic surface by post laser etching treatment. The surface displayed strong adhesion between the water droplets and textured surfaces, clearly illustrating the synergistic effect Chemistry-A European Journal between surface chemistry and topographic control.…”

Section: External Force Controlmentioning

confidence: 99%

Section: Special Superhydrophobicitymentioning

confidence: 99%

Surface Modification, Topographic Design and Applications of Superhydrophobic Systems

Zhao

Wang

Han

et al. 2022

Chemistry A European J

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Superhydrophobic surfaces with expanded wetting behaviors, like tunable adhesion, hybrid surface hydrophobicity and smart hydrophobic switching have attracted increasing attention due to their broad applications. Herein, the construction methods, mechanisms and advanced applications of special superhydrophobicity are reviewed, and hydro/superhydrophobic modifications are categorized and discussed based on their surface chemistry, and topographic design. The formation and maintenance of special superhydrophobicity in the metastable state are also examined and explored. In addition, particular attention is paid to the use of special wettability in various applications, such as membrane distillation, droplet‐based electricity generators and anti‐fogging surfaces. Finally, the challenges for practical applications and future research directions are discussed.

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Boosting Electrochemical Degradation of Water Pollutants Using Sulfur‐Rich Porous Polyimide‐Derived Laser‐Induced Graphene Catalytic Membrane

Sohn,

Hwang,

Nam

2024

Adv Eng Mater

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Water pollution is an inevitable concern associated with technological advancement. To address this problem, it is necessary to significantly shorten the manufacturing process of porous materials while enabling effective pollutant removal. Herein, a facile, rapid, and scalable approach is reported to obtain sulfur‐doped hierarchically porous laser‐induced graphene (S‐LIG) as a catalytic membrane with three‐dimensional networks by localized laser irradiation, along with possible adsorption and electrochemical degradation mechanisms for pollutant removal. S‐LIG is derived from sulfur‐containing porous polyimide film which is prepared via thermally induced phase separation followed by stepwise thermal imidization. Methylene blue (MB) adsorption behavior on the S‐LIG membrane closely fits the pseudo‐second‐order and Freundlich isotherm models, suggesting a complex sorption mechanism, including both strong chemical interaction and physical adsorption. Furthermore, S‐doping enhances catalytic activity for generating reactive oxygen species (ROS), aiding MB degradation via indirect oxidation, and improves direct oxidation on the anode by accelerating electron transfer at the electrodes. This results in a stable 93% MB degradation at a low 1.5 V after 24 h. Additionally, the impact of solution pH reveals that electrostatic attraction forces under basic conditions and the high generation of ROS under acidic conditions favor adsorption and electrochemical oxidation.

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Laser-Induced fluorinated graphene for superhydrophobic surfaces with anisotropic wetting and switchable adhesion

Cited by 23 publications

References 78 publications

Wettability Controlled Surface for Energy Conversion

Wettability Controlled Surface for Energy Conversion

Surface Modification, Topographic Design and Applications of Superhydrophobic Systems

Boosting Electrochemical Degradation of Water Pollutants Using Sulfur‐Rich Porous Polyimide‐Derived Laser‐Induced Graphene Catalytic Membrane

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