Tailoring micro/nanostructured porous polytetrafluoroethylene surfaces for dual-reversible transition of wettability and transmittance

Yin, Kai; Wu, Jianwen; Deng, Qinwen; Wu, Zhipeng; Wu, Tingni; Luo, Zhi; Jiang, Jie; Duan, Ji’an

doi:10.1016/j.cej.2022.134756

Cited by 52 publications

(20 citation statements)

References 53 publications

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“…Based on the mechanism of the formation of periodic structures by other scholars, ,− we believe that the formation of the periodic HS-s/sS is related to two main factors: one surface shock wave and one interference between SPP and the incident laser. For surface shock wave, it is a type of discontinuous peak propagation in the medium, which will make the physical properties of the medium such as pressure, temperature, and density change by leaps …”

Section: Resultsmentioning

confidence: 88%

“…The formation of HS-s/sS is similar to sand ripples. After the first pulse is in contact with the sample surface, some nanoparticles will appear, acting as the sand. , The interaction between the laser and the sample also creates a strong surface shock wave, which will act as the wind. Parts of metal particles are lifted by the surface shock wave and then accumulate into these convex stripes.…”

Section: Resultsmentioning

confidence: 99%

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Periodic Heterogeneous Surface with Superhydrophilic/Superhydrophobic Stripes Processed by a Picosecond Laser

Liang

Zhou

et al. 2022

Langmuir

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Heterogeneous surface with superhydrophilic/ superhydrophobic stripes (HS-s/sS) has great practical significance, which can be used in fuel cell water management, condensation heat transfer enhancement, underwater drag reduction. Herein, a fast and simple method for uniform HS-s/ sS on several mesh materials, including copper, stainless steel, and nickel, is achieved by using picosecond (ps) laser line-by-line scanning. Note that the scanning period between the lines is kept constant during processing, the HS-s/sS is formed by selforganized, while the similar structure cannot be processed on solid metal surfaces using the same parameters. The processing parameters, including scanning speed, defocus amount (DA), scanning period, and single pulse energy are systematically investigated to optimize HS-s/sS fabrication. It is found that the period of processed stripe on the mesh material is ∼1 mm, which is much larger than the scanning period. Interestingly, the as-prepared mesh surface show superhydrophobicity in the convex striped surface and superhydrophilicity in concave striped parts. The scanning electron microscopy results show that the structures on convex stripe are mainly composed of disordered hill-like structures, while the structures on the concave stripe mainly consist of periodic nanostripe structures. Moreover, the proportion of oxygen on the convex stripe is obviously higher than that on the concave stripe. The underlying mechanism of the HS-s/sS formation can be attributed to the interference between surface phonon polaritons (SPP) and the incident picosecond laser, as well as surface shock wave caused by the picosecond laser. We believe that such functional surfaces will be promising candidates for controlling liquid motion and fluid diversion processes.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Periodic Heterogeneous Surface with Superhydrophilic/Superhydrophobic Stripes Processed by a Picosecond Laser

Liang

Zhou

et al. 2022

Langmuir

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“…There have been plenty of reports about the control of wettability by femtosecond laser processing. [8,[46][47][48] Despite the excellent superhydrophobicity of the fabricated surfaces, the processing brings less other value-added functionalities, and some surfaces require post-treatments after laser ablation to achieve superhydrophobicity. [38,49] As indicated in Figure 6a, besides the attractive superhydrophobic feature, our laser processing also endows the surface with excellent and controllable electrical property.…”

Section: Resultsmentioning

confidence: 99%

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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“…In order to further test the anti-friction ability and practicability of the samples, samples loaded with weight (50 g) are rubbed on sandpaper to simulate scratches that may be encountered in daily life. [59][60][61][62] With the laser-treated surface facing down, the sample slides along with the weight on the sandpaper by pushing it with tweezers (Fig. 5a).…”

Section: Wettability Characterization and Durability Testsmentioning

confidence: 99%

Facile fabrication of hierarchical textures for substrate-independent and durable superhydrophobic surfaces

Wang

et al. 2022

Nanoscale

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138

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Tailoring micro/nanostructured porous polytetrafluoroethylene surfaces for dual-reversible transition of wettability and transmittance

Cited by 52 publications

References 53 publications

Periodic Heterogeneous Surface with Superhydrophilic/Superhydrophobic Stripes Processed by a Picosecond Laser

Periodic Heterogeneous Surface with Superhydrophilic/Superhydrophobic Stripes Processed by a Picosecond Laser

Wettability Controlled Surface for Energy Conversion

Facile fabrication of hierarchical textures for substrate-independent and durable superhydrophobic surfaces

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