UV Direct Laser Interference Patterning of polyurethane substrates as tool for tuning its surface wettability

Estevam-Alves, R.; Günther, Denise; Dani, Sophie; Eckhardt, Sebastian; Roch, Teja; Mendonça, Cleber Renato; Cestari, Ismar N.; Lasagni, Andrés Fabían

doi:10.1016/j.apsusc.2015.11.119

Cited by 23 publications

(15 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In biological and medical applications, repetitive surface textures improve the biocompatibility of bone implants [1], guide directional cell growth [2] and inhibit bacterial adhesion and biofilm formation [3]. Further advantages of periodic structured surfaces include enhanced light absorption [4], reduced friction [5,6] and anisotropic wetting [7]. These topographies are increasingly considered for the manufacture of functional surfaces, e.g., in biomedical and marine engineering, tribology, optics and aeronautics.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

Demuth

Lasagni

2020

Computation

View full text Add to dashboard Cite

Functional surfaces characterised by periodic microstructures are sought in numerous technological applications. Direct laser interference patterning (DLIP) is a technique that allows the fabrication of microscopic periodic features on different materials, e.g., metals. The mechanisms effective during nanosecond pulsed DLIP of metal surfaces are not yet fully understood. In the present investigation, the heat transfer and fluid flow occurring in the metal substrate during the DLIP process are simulated using a smoothed particle hydrodynamics (SPH) methodology. The melt pool convection, driven by surface tension gradients constituting shear stresses according to the Marangoni boundary condition, is solved by an incompressible SPH (ISPH) method. The DLIP simulations reveal a distinct behaviour of the considered substrate materials stainless steel and high-purity aluminium. In particular, the aluminium substrate exhibits a considerably deeper melt pool and remarkable velocity magnitudes of the thermocapillary flow during the patterning process. On the other hand, convection is less pronounced in the processing of stainless steel, whereas the surface temperature is consistently higher. Marangoni convection is therefore a conceivable effective mechanism in the structuring of aluminium at moderate fluences. The different character of the melt pool flow during DLIP of stainless steel and aluminium is confirmed by experimental observations.

show abstract

Section: Introductionmentioning

confidence: 99%

“…The fabrication of repetitive microstructures by means of DLIP, using nanosecond pulses of ultraviolet laser radiation, was demonstrated on ceramics [1], polymers [2][3][4]7], non-metals [5] and metals [6]. A thorough understanding of the process is essential to the precise patterning of surfaces.…”

Section: Introductionmentioning

confidence: 99%

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

Demuth

Lasagni

2020

Computation

View full text Add to dashboard Cite

show abstract

“…However, the size of the achievable structural parameters do not only depend on the spatial period of the interference pattern but on the kind of interaction between the laser light and the material (e.g., melting, evaporation, etc.). In the case of processing of polymer substrates, spatial periods even in the sub-micrometer range could be obtained due to the very short thermal diffusion lengths compared to metals, as it has been shown for polycarbonate [ 14 ], polyurethane [ 15 ], or poly (styrene-co-acrylonitrile) [ 16 ].…”

Section: Methodsmentioning

confidence: 99%

“…However, MPS can be produced combining a layer-by-layer manufacturing technology of laser-cut [ 9 , 11 ] and structured [ 12 , 13 , 14 , 15 , 16 ] polymer foils and 3D printing of application-specific cell culture modules and reservoirs [ 17 ]. For fast and flexible manufacturing and marking of tailor-made MPS a universal micromachining platform is needed which provides the following latest key technologies: laser micro cutting of polymer foils [ 9 , 11 ], laser micro- und sub-micro-structuring of polymer foils [ 12 , 13 , 14 , 15 , 16 ], 3D printing of polymer components [ 17 ], Optical inspection and online process control. …”

Section: Introductionmentioning

confidence: 99%

Universal Micromachining Platform and Basic Technologies for the Manufacture and Marking of Microphysiological Systems

et al. 2017

View full text Add to dashboard Cite

Micro Physiological Systems (MPS), also known as Multi-Organ-Chip, Organ-on-a-Chip, or Body-on-a-Chip, are advanced microfluidic systems that allow the cultivation of different types of cells and tissue in just one common circuit. Furthermore, they thus can also adjust the interaction of these different tissues. Perspectival MPS will replace animal testing. For fast and flexible manufacturing and marking of MPS, a concept for a universal micromachining platform has been developed which provides the following latest key technologies: laser micro cutting of polymer foils, laser micro- and sub-micro-structuring of polymer foils, 3D printing of polymer components as well as optical inspection and online process control. The combination of different laser sources, processing optics, inspection systems, and print heads on multiple axes allows the change and exactly positioning to the workpiece during the process. Therewith, the realization of MPS including 3D printed components as well as direct laser interference patterned surfaces for well-defined cell adhesion and product protection is possible. Additional basic technologies for the generation of periodical line-like structures at polycarbonate foils using special Direct Laser Interference Patterning (DLIP) optics as well as for the 3D printing of fluid-tight cell culture reservoirs made of Acrylonitrile Butadiene Styrene directly onto polycarbonate microfluidics were established. A first prototype of the universal micromachining platform combining different lasers with Direct Laser Writing and DLIP is shown. With this laser micro cutting as well as laser micro-structuring of polycarbonate (PC) foils and therewith functionalization for MPS application could be successfully demonstrated.

show abstract

“…The DLIP technology is capable of treating a wide number of materials, ranging from metals to polymers and coatings 33–39 with processing speeds up to 0.9 m²/min 40 . Moreover, this method has been employed in many application fields, such as to reduce friction on metals, to improve the adhesion of bone cells for dental implants, to fabricate nanoparticles for photocatalysis enhancement, for growing ZnO nanowires for sensing applications, to change the wettability on metals and polymers as well as for improving the conductivity in spot welding 37,41–45 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of inclined non-symmetrical periodic micro-structures using Direct Laser Interference Patterning

Alamri

El-Khoury

Aguilar‐Morales

et al. 2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

The direct fabrication of microstructures, having a non-symmetrical morphology with controllable inclination, presents nowadays a challenging task. Natural examples of surfaces with inclined topographies have shown to provide anisotropic functionalities, which have attracted the interest of several researchers in the last years. This work presents a microfabrication technique for producing microstructures with a determined and controllable inclination angle using two-beam Direct Laser Interference Patterning. Polyimide foils are irradiated with a 4 ns UV (266 nm) laser source producing line-like structures with a period varying from 4.6 µm to 16.5 µm. The inclinations, retrieved by tilting the sample with respect to the optical axis of the setup, are changed from 0° to 75°, introducing a well controllable and defined inclination of the structure walls. The structuring parameters (laser fluence, number of laser pulses and interference period) as well as the inclination of the microstructures are correlated with the global tilting of the sample. As a result, a determined laser fluence and number of pulses are necessary to observe a remarkable non-symmetrical morphology of the structures. In addition, the presence of structural undercuts is reported, which opens the possibility for developing new direction-dependent properties on polymeric materials. As an example, preliminary results on light diffraction are presented, showing a similar behavior as blazed diffraction gratings.

show abstract

UV Direct Laser Interference Patterning of polyurethane substrates as tool for tuning its surface wettability

Cited by 23 publications

References 21 publications

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

Universal Micromachining Platform and Basic Technologies for the Manufacture and Marking of Microphysiological Systems

Fabrication of inclined non-symmetrical periodic micro-structures using Direct Laser Interference Patterning

Contact Info

Product

Resources

About