Topography versus chemistry – How can we control surface wetting?

Lößlein, Sarah Marie; Mücklich, Frank; Grützmacher, Philipp G.

doi:10.1016/j.jcis.2021.11.071

Cited by 29 publications

(19 citation statements)

References 73 publications

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“…Recently many studies aim at tailoring the wetting response by applying periodic patterns with pulsed lasers 33 , 34 . An earlier study proved the strong influence of surface chemistry on the wetting behavior of topographically altered samples 11 , which is especially important for laser patterned surfaces as the modification of topography always is accompanied by distinct changes in surface chemistry through oxidation processes 35 . Researchers are well aware of the influence of topographical changes e.g.…”

Section: Resultsmentioning

confidence: 98%

“…The cover method displayed in Fig. 11 therewith successfully suppresses droplet evaporation as no relevant changes in the SCAs can be observed even after 10 min and allows for an observation of the SCA for several minutes, which can be especially important for patterned surfaces 11 .…”

Section: Resultsmentioning

confidence: 99%

“…This recommendation might not be applicable to all sample-water-systems e.g. a laser line pattern with a periodicity of 50 µm as analyzed in 11 . Especially if anisotropic wetting behavior is to be investigated 11,[65][66][67][68] excessively large droplets might simply flood the entire sample and cover the effect of anisotropic structures.…”

Section: Droplet Volumementioning

confidence: 99%

“…Also extreme wetting cases like superhydrophilicity with a strong droplet spreading or superhydrophobicity with SCAs around 150° can be observed by SCA measurements 9 . Their implementation is not limited to smooth surfaces, as they are also used to analyze topographically modified structures, where recently the wettability of laser treated surfaces is focused in particular [10][11][12][13] . Here, this method also allows for analyzing anisotropic wetting behavior, which is especially important for directionally patterned surfaces 11,14 .…”

mentioning

confidence: 99%

“…Their implementation is not limited to smooth surfaces, as they are also used to analyze topographically modified structures, where recently the wettability of laser treated surfaces is focused in particular [10][11][12][13] . Here, this method also allows for analyzing anisotropic wetting behavior, which is especially important for directionally patterned surfaces 11,14 . For ideally smooth surfaces, the SCA can be described by the Young's equation and is considered as a thermodynamic contact angle reached by energy minimization in the three-phase wetting system consisting of liquid, solid and vapor 9,15 .…”

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confidence: 99%

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An in-depth evaluation of sample and measurement induced influences on static contact angle measurements

Lößlein

Merz

Müller

et al. 2022

Sci Rep

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Static contact angle measurements are one of the most popular methods to analyze the wetting behavior of materials of any kind. Although this method is readily applicable without the need of sophisticated machinery, the results obtained for the very same material may vary strongly. The sensitivity of the measurement against environmental conditions, sample preparation and measurement conduction is a main factor for inconsistent results. Since often no detailed measurement protocols exist alongside published data, contact angle values as well as elaborated wetting studies do not allow for any comparison. This paper therefore aims to discuss possible influences on static contact angle measurements and to experimentally demonstrate the extent of these effects. Sample storage conditions, cleaning procedures, droplet volume, water grade and droplet application as well as the influence of evaporation on the static contact angle are investigated in detail. Especially sample storage led to differences in the contact angle up to 60%. Depending on the wetting state, evaporation can reduce the contact angle by 30–50% within 10 min in dry atmospheres. Therefore, this paper reviews an existing approach for a climate chamber and introduces a new measuring setup based on these results. It allows for the observation of the wetting behavior for several minutes by successfully suppressing evaporation without negatively affecting the surface prior to measurement by exposure to high humidity environments.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Droplet Volumementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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An in-depth evaluation of sample and measurement induced influences on static contact angle measurements

Lößlein

Merz

Müller

et al. 2022

Sci Rep

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Fabrication of Smooth, Periodic Surface Structures: Combining Direct Laser Interference Patterning and Electropolishing

Schäfer,

Delfino,

Leonhard‐Trautmann

et al. 2024

Adv Eng Mater

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The manipulation of topography is crucial in surface engineering to customize material properties and surface functionalities for specific applications. Scientists have been inspired by natural surfaces found in plants and animals and have increasingly used engineered surface structures to improve characteristics such as friction, wear, electrical resistance, wettability, and antimicrobial behavior across various fields. Direct Laser Interference Patterning (DLIP) is a technique that can rapidly create well‐defined, periodic surface structures. However, it can still face challenges such as surface roughness and non‐uniformity, which require complementary post‐processing techniques. This paper investigates the effectiveness of electropolishing in phosphoric acid as a post‐processing method for DLIP‐treated copper surfaces. Through systematic characterization and analysis, it is demonstrated that electropolishing selectively smoothens DLIP‐treated surfaces by removing undesired by‐products, such as oxides and redeposited material while retaining the underlying structure. The real surface area and, consequently, the S ratio is diminished by up to 13 %, while the root mean square roughness Rq along the topographic maxima of the line pattern is reduced by approximately 90 %. These findings contribute to the advancement of our understanding of surface modification techniques and their potential applications in diverse fields.This article is protected by copyright. All rights reserved.

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Anisotropic Superhydrophobic Properties Replicated from Leek Leaves

Mirmohammadi,

Shirazi,

Heikkilä

et al. 2024

Small

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A bio‐inspired approach to fabricate robust superhydrophobic (SHB) surfaces with anisotropic properties replicated from a leek leaf is presented. The polydimethylsiloxane (PDMS) replica surfaces exhibit anisotropic wetting, anti‐icing, and light scattering properties due to microgrooves replicated from leek leaves. Superhydrophobicity is achieved by a novel modified candle soot (CS) coating that mimics leek's epicuticular wax. The resulting surfaces show a contact angle (CA) difference of ≈30° in the directions perpendicular and parallel to the grooves, which is similar to the anisotropic properties of the original leek leaf. The coated replica is durable, withstanding cyclic bending tests (up to 10 000 cycles) and mechanical sand abrasion (up to 60 g of sand). The coated replica shows low ice adhesion (10 kPa) after the first cycle; and then, increases to ≈70 kPa after ten icing–shearing cycles; while, anisotropy in ice adhesion becomes more evident with more cycles. In addition, the candle soot‐coated positive replica (CS‐coated PR) demonstrates a transmittance of ≈73% and a haze of ≈65% at the wavelength of 550 nm. The results show that the properties depend on the replicated surface features of the leek leaf, which means that the leek leaf appears to be a highly useful template for bioinspired surfaces.

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Topography versus chemistry – How can we control surface wetting?

Cited by 29 publications

References 73 publications

An in-depth evaluation of sample and measurement induced influences on static contact angle measurements

An in-depth evaluation of sample and measurement induced influences on static contact angle measurements

Fabrication of Smooth, Periodic Surface Structures: Combining Direct Laser Interference Patterning and Electropolishing

Anisotropic Superhydrophobic Properties Replicated from Leek Leaves

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