Influence of roughness achieved by periodic structures on the wettability of aluminum using direct laser writing and direct laser interference patterning technology

Milles, Stephan; Voisiat, Bogdan; Nitschke, Mirko; Lasagni, Andrés Fabían

doi:10.1016/j.jmatprotec.2019.02.023

Cited by 62 publications

(62 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where F 0 is the laser peak fluence and r(n) is the distance from the point of interest to the center of the pulse, which is expressed in terms of pulse number n and the total number of pulses N within the structured area diameter r th (see Figure 3c) using Equations (7) and (8):…”

Section: Development Of An Analytical Ablation Model For Dlipmentioning

confidence: 99%

“…Such microstructures have been intensively investigated, because of their potential utilization for surface functionalization in different application fields [3][4][5]. For example, surface functions including tribological, superhydrophobicity, and bacteria-repellency have been already demonstrated by means of DLIP in previous works [6][7][8]. It was also showed that this technology can be used for decorative applications by forming structural colors on the material surface, including in steels and polymers [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of an Analytical Model for Optimization of Direct Laser Interference Patterning

et al. 2020

View full text Add to dashboard Cite

Direct laser interference patterning (DLIP) has proven to be a fast and, at the same time, high-resolution process for the fabrication of large-area surface structures. In order to provide structures with adequate quality and defined morphology at the fastest possible fabrication speed, the processing parameters have to be carefully selected. In this work, an analytical model was developed and verified by experimental data, which allows calculating the morphological properties of periodic structures as a function of most relevant laser-processing parameters. The developed model permits to improve the process throughput by optimizing the laser spot diameter, as well as pulse energy, and repetition rate. The model was developed for the structures formed by a single scan of the beam in one direction. To validate the model, microstructures with a 5.5 µm spatial period were fabricated on stainless steel by means of picosecond DLIP (10 ps), using a laser source operating at a 1064 nm wavelength. The results showed a difference of only 10% compared to the experimental results.

show abstract

Section: Development Of An Analytical Ablation Model For Dlipmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of an Analytical Model for Optimization of Direct Laser Interference Patterning

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The fabricated mesh-like structure consists of three consecutively formed line-like structures, whose orientation is rotated by 60° respectively to each other. The distance between the lines was set to 50 µm [17]. The DLIP technology was applied to fabricate periodic 7 µm pillar-like structures, utilizing a solid-state Nd:YVO 4 laser (Edgewave PX 200, Germany) emitting 1064 nm wavelength with 10 ps pulse duration.…”

Section: Laser Microstructuring Proceduresmentioning

confidence: 99%

“…The repetition rate was 30 kHz with a maximum output power of 10 W. The system is equipped with a commercial available DLIP optical head (manufactured by Fraunhofer IWS, Germany). Using this head, the linelike intensity profile, which extends over a circular shaped area with a diameter of ~1 40 µm, is created [17]. The laser fluence was set to ~ 1.9 J/cm².…”

Section: Laser Microstructuring Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Multifunctional aluminium surfaces – Laser-structured micropatterns with ice-repellent, superhydrophobic and easy-to-clean properties

et al. 2020

View full text Add to dashboard Cite

In this work, the fabrication of multifunctional periodic microstructures on pure aluminium is presented. Three different geometries were fabricated with feature sizes ranging between 7 µm and 50 µm by using laser-based microstructuring methods. In detail, nanosecond pulsed direct laser writing and picosecond pulsed direct laser interference patterning were used with infrared laser radiation. The wetting characteristics of these structures were investigated performing static water contact angle measurements as well as by measuring the contact angle hysteresis and the sliding angle. The final wetting results show constant static contact angles above 150°, permitting the water droplets to roll off the substrate as well as collecting contamination at the same time. This self-cleaning effect led to a reduction of up to 94% of the spread of 1 µm sized manganese oxide particles. In addition, the freezing time required for droplets laying on the patterned surfaces was increased nearly by 300% at a temperature of 20 °C below zero. Finally, the results are compared to finite element simulations of heat transfer.

show abstract

3D Micropatterned Functional Surface Inspired by Salvinia Molesta via Direct Laser Lithography for Air Retention and Drag Reduction

Tricinci

Pignatelli

Mattoli

2023

Adv Funct Materials

View full text Add to dashboard Cite

Bioinspired functional surfaces are attracting increasing interest in surface engineering, mostly in the field of wettability. The Salvinia-effect is a remarkable example of superficial air retention and drag force reduction caused by selective chemical coating (super-hydrophobic wax and hydrophilic dead cells) and peculiar 3D hierarchical morphological structures. The replication of Salvinia-like patterns at the microscale has always been prevented by limitations in microfabrication techniques, thus hindering relevant technological applications at this dimensional scale. Integrating 3D laser lithography and traditional microfabrication techniques, dimensionally downscaled, 3D micropatterned surfaces inspired for the first time by both morphology and chemical coating of the hairs present on the Salvinia Molesta leaves are reproduced. The effect of design and different surface energies (bare hydrophilic, hydrophobic, selective hydrophilic/hydrophobic coating) on the wettability are modeled and investigated. Bioinspired surfaces demonstrated to be super-hydrophobic in terms of apparent static contact angle (up to 170°) and provide tunable adhesion with roll-off angle from less than 10° to 90°. They successfully proved remarkable underwater air retention capability, sustained by stable Cassie-Baxter state under external hydrostatic pressure up to 4 atm. The proposed surfaces are tested in hydrodynamic conditions: drag force reduction is successfully demonstrated with up to 40% of energy saved.

show abstract

Influence of roughness achieved by periodic structures on the wettability of aluminum using direct laser writing and direct laser interference patterning technology

Cited by 62 publications

References 37 publications

Development of an Analytical Model for Optimization of Direct Laser Interference Patterning

Development of an Analytical Model for Optimization of Direct Laser Interference Patterning

Multifunctional aluminium surfaces – Laser-structured micropatterns with ice-repellent, superhydrophobic and easy-to-clean properties

3D Micropatterned Functional Surface Inspired by Salvinia Molesta via Direct Laser Lithography for Air Retention and Drag Reduction

Contact Info

Product

Resources

About