Laser surface texturing of copper and variation of the wetting response with the laser pulse fluence

Allahyari, Elaheh; Nivas, Jijil Jj; Oscurato, Stefano Luigi; Salvatore, Marcella; Ausanio, G.; Vecchione, A.; Fittipaldi, R.; Maddalena, Pasqualino; Bruzzese, R.; Amoruso, Salvatore

doi:10.1016/j.apsusc.2018.11.202

Cited by 56 publications

(23 citation statements)

References 45 publications

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“…The topographies of the structured surfaces were characterized by means of an AFM (WITEC Alpha RS300) [ 69–71 ] operating in tapping mode using a cantilever with 75 kHz resonance frequency. Typical AFM scans reported here were performed over sample area of 70 × 70 µm 2 with resolution of 512 × 512 pixels.…”

Section: Methodsmentioning

confidence: 99%

Deterministic Realization of Quasicrystal Surface Relief Gratings on Thin Azopolymer Films

Salvatore

Borbone

Oscurato

2020

Adv Materials Inter

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Spatially structured UV–visible light fields generate topographic modulations on the surface of films of azobenzene‐containing polymers. The geometry of the surface reliefs depends on the spatiotemporal distribution of light over the sample. If multistep sequential irradiations are used, even illumination configurations as simple as the interference of two linearly polarized beams produce complex surface textures. This is the case of the quasicrystal geometries, obtainable as the superposition of multiple sinusoidal surface relief gratings oriented in different directions over the surface. The quantitative relief design would require a comprehensive theoretical description of the light‐induced relief formation mechanism, which is still elusive for azopolymers. Here, despite limiting the description at a phenomenological level, the deterministic design of the quasicrystal surface reliefs obtained in sequential light exposures of an azopolymer film is demonstrated. The model provides an excellent agreement between simulated and experimental relief textures, predicting also the dependence of relief structural features on illumination parameters as the number of exposure steps and the beam interference angle. The deterministic texture design allows the controlled tailoring of surface functionalities related to the relief geometry like light diffraction properties of the samples, which are here exploited to manipulate, split, and trap diffracted light.

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Section: Methodsmentioning

confidence: 99%

Deterministic Realization of Quasicrystal Surface Relief Gratings on Thin Azopolymer Films

Salvatore

Borbone

Oscurato

2020

Adv Materials Inter

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“…Since its discovery in 1995 4,5 with the sinusoidal surface reliefs ( Surface Relief Gratings , SRGs) induced by the irradiation of azopolymers with the interference pattern of two laser beams, the mass migration and the resulting surface reliefs have been largely exploited as light-induced superficial patterning technique 6,7 . Recent advances in this field are now oriented toward the realization of complex superficial textures, particularly suited for applications in wettability, biology and photonics 3,8–15 , and not achievable with standard photoresists that only respond to the light intensity distribution.…”

Section: Introductionmentioning

confidence: 99%

Computer-generated holograms for complex surface reliefs on azopolymer films

Oscurato

Salvatore

Borbone

et al. 2019

Sci Rep

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The light-driven superficial structuration observed on the surface of films of azobenzene-containing polymers follows the optical field distribution of the illuminating light pattern, i.e. the light polarization state and the intensity distribution. The ability to precisely manipulate the illuminating intensity pattern can hence provide a new level in the range of complex light-induced superficial textures accessible onto azopolymer film surfaces. In this respect, digital holography, based on the principles of the Computer-Generated Holograms (CGHs), and actually implemented by means of a versatile liquid crystal spatial light modulator, can represent a unique experimental tool in the field of the light-induced mass migration in azo-materials. In the present work, we demonstrate the possibility to precisely control the features and the quality of complex light patterns generated through CGHs in order to induce arbitrarily complex surface reliefs onto the surface of an azopolymer. The results shown here can potentially broaden the range of possible applications of photo-responsive azopolymer films in the fields of surface engineering, biology and photonics.

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“…LIPSS modification has also been performed on other metal materials for obtaining superhydrophobic surfaces, such as copper (Liu et al, 2017). Triply hierarchical structures (micro-trenches, nanoripples, and nanoparticles) were obtained on copper foil surface by the irradiation of 800-nm fs lasers with a repetition rate of 1 kHz (Allahyari et al, 2019). The structure complexity effectively reinforced the hydrophobicity of the copper foil surface, increasing the water contact angle (WCA) from 100 • to 160 • .…”

Section: Laser Induced Periodical Surface Structures (Lipss)mentioning

confidence: 99%

Bioinspired Superhydrophobic Surfaces via Laser-Structuring

Liu

et al. 2020

Front. Chem.

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Bioinspired superhydrophobic surfaces are an artificial functional surface that mainly extracts morphological designs from natural organisms. In both laboratory research and industry, there is a need to develop ways of giving large-area surfaces water repellence. Currently, surface modification methods are subject to many challenging requirements such as a need for chemical-free treatment or high surface roughness. Laser micro-nanofabrications are a potential way of addressing these challenges, as they involve non-contact processing and outstanding patterning ability. This review briefly discusses multiple laser patterning methods, which could be used for surface structuring toward creating superhydrophobic surfaces.

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Laser surface texturing of copper and variation of the wetting response with the laser pulse fluence

Cited by 56 publications

References 45 publications

Deterministic Realization of Quasicrystal Surface Relief Gratings on Thin Azopolymer Films

Deterministic Realization of Quasicrystal Surface Relief Gratings on Thin Azopolymer Films

Computer-generated holograms for complex surface reliefs on azopolymer films

Bioinspired Superhydrophobic Surfaces via Laser-Structuring

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