Laser-Patterned Super-Hydrophobic Pure Metallic Substrates: Cassie to Wenzel Wetting Transitions

Kietzig, Anne‐Marie; Mirvakili, Mehr Negar; Kamal, Saeid; Englezos, Peter; Hatzikiriakos, Savvas G.

doi:10.1163/016942410x549988

Cited by 158 publications

(101 citation statements)

References 49 publications

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“…During the following days, Θ continuously increases, indicating a saturation-type behavior reaching values between 100 • and 140 • , in accordance with previous observations on several metals [29,34,35]. An explanation for this is given in [29] and [21]. A CO 2 decomposition reaction is triggered by the laser process and generates new non-polar carbon groups on the surface which have a hydrophobic character.…”

Section: Wetting Behaviorsupporting

confidence: 89%

“…Starting from the initial contact angle of an unstructured surface of 64 • , i.e., the hydrophilic range (this contact angle is calculated by Young's equation for a flat surface), for all fluences, the apparent contact angle after laser irradiation and surface structuring initially drops further into the hydrophilic range, a behavior that has been reported by several other groups [29,34,35]. During the following days, Θ continuously increases, indicating a saturation-type behavior reaching values between 100 • and 140 • , in accordance with previous observations on several metals [29,34,35]. An explanation for this is given in [29] and [21].…”

Section: Wetting Behaviorsupporting

confidence: 61%

“…Whereas the apparent contact angle initially reveals a pronounced drop as compared to unstructured brass, it increases into the hydrophobic regime and saturates over several days. This temporal evolution has already been shown for several metallic surfaces after femtosecond-based laser structuring [17,[25][26][27][28] and is mainly described by a highly chemical reactive surface direct after laser treatment and a growing passive hydrophobic layer rich on carbon from the composition of CO 2 [29]. Both the initial drop and the subsequent increase reveal a strong dependence on pulse overlap and laser fluence.…”

Section: Introductionsupporting

confidence: 53%

“…The resulting image was analyzed to determine the apparent contact angle by the circular shape fitting of the drop. Studies by Kietzig et al [29] and Martínez-Calderon et al [25] have shown that the apparent contact angle of water on laser-structured surfaces depends on the elapsed time between the structuring process itself and the actual measurement. To evaluate this effect specifically on LIPSS, for each laser parameter set, three identical samples were initially produced, allowing measurements of the apparent contact angle over days on fresh, i.e., previously unused, specimens.…”

Section: Methodsmentioning

confidence: 99%

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Time Dependence of Wetting Behavior Upon Applying Hierarchic Nano-Micro Periodic Surface Structures on Brass Using Ultra Short Laser Pulses

et al. 2018

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We present a comprehensive experimental study on laser-induced hierarchic nano-micro periodic surface structures on brass that influences wetting behavior. Using ultra short laser pulses with a wavelength of 1030 nm, large scaled areas completely covered by laser-induced periodic surface structures (LIPSS) are generated with these areas being superimposed by ablation trenches and u-ripples. The influence of the incident laser fluence and pulse overlap on the apparent contact angle for coverage of the surface with distilled water with a surface tension of 74 mN/m are examined with its temporal evolution being observed over a period of two weeks. Our results show an initial drop in the apparent contact angle below the angle of an unstructured surface. Using atomic force microscopy, the roughness factor described by the Wenzel model is determined and compared to the roughness factor given by the apparent contact angle measurement. The ascertained difference in roughness cannot be entirely attributed to the topography of the laser-structured surface. We suggest that changes in the surface chemistry additionally alter the wetting behavior as confirmed by X-ray photoelectron spectroscopy (XPS) measurements. On a time scale of days after laser irradiation, the apparent contact angle increases into the hydrophobic range. Both the absolute apparent contact angle and this temporal change reveal a pronounced dependence on the applied laser fluence and pulse overlap. In particular, increasing both, the fluence and the pulse overlap leads to smaller apparent contact angles directly after the irradiation and to higher apparent contact angles after an observation period of two weeks.

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Section: Wetting Behaviorsupporting

confidence: 89%

Section: Wetting Behaviorsupporting

confidence: 61%

Section: Introductionsupporting

confidence: 53%

Section: Methodsmentioning

confidence: 99%

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Time Dependence of Wetting Behavior Upon Applying Hierarchic Nano-Micro Periodic Surface Structures on Brass Using Ultra Short Laser Pulses

et al. 2018

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“…The Cassie-Baxter state is usually metastable and a potential imbibition can lead to Wenzel state, i.e. wetting of the surface structures [17].…”

Section: Introductionmentioning

confidence: 99%

Mechanical durability of hydrophobic surfaces fabricated by injection moulding of laser-induced textures

Romano

Gülçür

García‐Girón

et al. 2019

Applied Surface Science

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CitationRomano J-M, Gülçür M, Garcia-Giron A et al (2019) Mechanical durability of hydrophobic surfaces fabricated by injection moulding of laser-induced textures. Applied Surface Science. 476: 850-860. Rights ABSTRACT.The paper reports an investigation on the mechanical durability of textured thermoplastic surfaces together with their respective wetting properties. A range of laser-induced topographies with different aspect ratios from micro to nanoscale were fabricated on tool steel inserts using an ultrashort pulsed near infrared laser. Then, through micro-injection moulding the topographies were replicated onto polypropylene surfaces and their durability was studied systematically. In particular, the evolution of topographies on textured thermoplastic surfaces together with their wetting properties were investigated after undergoing a controlled mechanical abrasion, i.e.reciprocating dry and wet cleaning cycles. The obtained empirical data was used both to study the effects of cleaning cycles and also to identify cleaning procedures with a minimal impact on textured thermoplastic surfaces and their respective wetting properties. In addition, the use of 3D areal parameters that are standardised and could be obtained readily with any state-of-the-art surface characterisation system are discussed for monitoring the surfaces' functional response.

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Robust Technique Allowing the Manufacture of Superoleophobic (Omniphobic) Metallic Surfaces

et al. 2014

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Omniphobic metallic surfaces obtained with a robust two-stage process are reported. The surfaces demonstrate high apparent contact angles accompanied with a low contact angle hysteresis for a variety of liquids, including water, diidomethane, canola, castor, silicone oils, and crude petroleum oil. The superoleophobicity was achieved by fluorination of the nano-rough aluminum surfaces under treatment with perfluorononanoic acid, as established by TOF-SIMS spectrometry. The stability of the Cassie wetting regime was investigated. The critical surface tension of a liquid corresponding to the onset of wetting transitions was established experimentally.

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Laser-Patterned Super-Hydrophobic Pure Metallic Substrates: Cassie to Wenzel Wetting Transitions

Cited by 158 publications

References 49 publications

Time Dependence of Wetting Behavior Upon Applying Hierarchic Nano-Micro Periodic Surface Structures on Brass Using Ultra Short Laser Pulses

Time Dependence of Wetting Behavior Upon Applying Hierarchic Nano-Micro Periodic Surface Structures on Brass Using Ultra Short Laser Pulses

Mechanical durability of hydrophobic surfaces fabricated by injection moulding of laser-induced textures

Robust Technique Allowing the Manufacture of Superoleophobic (Omniphobic) Metallic Surfaces

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