Femtosecond ultraviolet (248 nm) excimer laser processing of Teflon (PTFE)

Adhi, K. P.; Owings, Roger L.; Railkar, T. A.; Brown, W.D.; Malshe, Ajay P.

doi:10.1016/s0169-4332(03)00586-5

Cited by 31 publications

(10 citation statements)

References 13 publications

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“…Figure 4 a illustrates that the ablated line width is smaller than the calculated laser beam diameter. This result is consistent with literature and typical for the strong bonding and poor ablation characteristics of PTFE [ 23 , 24 ]. The ablated line width follows the symmetry of the beam diameter when the sample is moved away from the focus in either direction.…”

Section: Resultssupporting

confidence: 93%

“…Considering the inherent hydrophobic nature of PTFE and the porous fibrous structures resulting from femtosecond irradiation, an air trapping wetting state is expected for our biomimetic surfaces. Before carrying out detailed wettings studies, it was confirmed by FTIR spectroscopy that the surface chemistry of PTFE did not change through the femtosecond laser micromachining, which is consistent with literature [ 24 ] (refer to supplementary material for spectra). Wetting experiments were carried out by drop impact and contact angle measurements.…”

Section: Resultssupporting

confidence: 83%

“…The first report on laser ablation of PTFE was contributed by Küper et al (1989) who presented that ablation with a fs UV excimer laser in air results in a roughness on the length scale of 1 µm on the ablated spot [ 22 ]. While Kumagai et al (1994) showed high magnification electron microscope images of PTFE ablated with a Ti:Sapphire system in ultrahigh vacuum that show clean ablation edges [ 23 ], Adhi et al (2003) report porous walls for holes drilled in air with a femtosecond UV excimer laser [ 24 ]. Lippert and Dickinson (2003) provide a comprehensive overview of surface features created by ablation on various polymers.…”

Section: Introductionmentioning

confidence: 99%

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Robust Non-Wetting PTFE Surfaces by Femtosecond Laser Machining

Fang

Lehr

Danielczak

et al. 2014

IJMS

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Nature shows many examples of surfaces with extraordinary wettability, which can often be associated with particular air-trapping surface patterns. Here, robust non-wetting surfaces have been created by femtosecond laser ablation of polytetrafluoroethylene (PTFE). The laser-created surface structure resembles a forest of entangled fibers, which support structural superhydrophobicity even when the surface chemistry is changed by gold coating. SEM analysis showed that the degree of entanglement of hairs and the depth of the forest pattern correlates positively with accumulated laser fluence and can thus be influenced by altering various laser process parameters. The resulting fibrous surfaces exhibit a tremendous decrease in wettability compared to smooth PTFE surfaces; droplets impacting the virgin or gold coated PTFE forest do not wet the surface but bounce off. Exploratory bioadhesion experiments showed that the surfaces are truly air-trapping and do not support cell adhesion. Therewith, the created surfaces successfully mimic biological surfaces such as insect wings with robust anti-wetting behavior and potential for antiadhesive applications. In addition, the fabrication can be carried out in one process step, and our results clearly show the insensitivity of the resulting non-wetting behavior to variations in the process parameters, both of which make it a strong candidate for industrial applications.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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Robust Non-Wetting PTFE Surfaces by Femtosecond Laser Machining

Fang

Lehr

Danielczak

et al. 2014

IJMS

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“…Three types of devices representative of the most common polyester fabric stent‐graft designs for deployment in the thoracic and abdominal aorta were selected. The ePTFE stent‐grafts that are frequently deployed in the thoracic aorta were not considered based upon the selection of the CVX‐300 Excimer Laser System (Spectranetics, Colorado Springs, CO, USA) . The Cook Zenith TX2: It is manufactured by Cook Medical Inc., Bloomington, MN, USA.…”

Section: Methodsmentioning

confidence: 99%

In Vitro Laser Fenestration of Aortic Stent‐Grafts: A Qualitative Analysis Under Scanning Electron Microscope

et al. 2016

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In situ fenestration of stent-grafts allows patients with life threatening aortic pathologies to be amenable to emergent "off the shelf indications for use" percutaneous treatments as a bail out technique. Three types of aortic stent-grafts were subjected to laser fenestration in a physiological saline solution followed by balloon angioplasty using 8, 10 or 12 mm in diameter noncompliant balloons. The morphology and the size of fenestrations were observed under optical and scanning electron microscopy. The damage to the fabrics was analyzed and quantified. The creation of fenestrations was feasible in all devices, with varying degrees of fraying and/or tearing. The monofilament twill weave (Medtronic Valiant) tore in two directions (warp and weft) while the multifilament weave fenestrations showed more fraying (Anaconda Vascutek and Zenith TX2 Cook). The size and directions of tearing were more predictable with the 8 mm diameter balloon whereas the results obtained with the 10 and 12 mm diameter balloons were more unpredictable. The fenestrations were free of melting of the yarns and blackening of the filaments. The in situ fenestration is feasible but the observed damage to the fabric constructions must be carefully considered. This procedure must currently be limited to urgent and emergent life threatening cases because it is off indications for use for approved devices.

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“…Wet chemical etching is an easily controllable approach compared to other techniques. Additionally, it is very suitable for commercial and industrial adoption of multi-material, large-scale, and hierarchical superhydrophobic functions[70][71][72][73][74]. Liao et al[75] used a continuous chemical etching approach to obtain a superhydrophobic surface on aluminum foil.…”

mentioning

confidence: 99%

Current trend in fabrication of complex morphologically tunable superhydrophobic nano scale surfaces

Abdulhussein

Kannarpady

Wright

et al. 2016

Applied Surface Science

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Superhydrophobic surfaces are found in nature and possess several fascinating properties, including the ability to self-clean. A typical superhydrophobic surface has micro/nanostructure roughness and low surface energy, which combine to give it its unusual anti-wetting properties. Because of their unique capabilities, these surfaces have interested scientists in research and industry fields for years. In recent decades, researchers have developed a number of synthetic methods for producing novel superhydrophobic surfaces that mimic natural surfaces. These synthetic surfaces have been widely applied on different types of substrates for potential widespread, practical applications. This review article focuses on these advances in fabricating manmade superhydrophobic surfaces.

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Femtosecond ultraviolet (248 nm) excimer laser processing of Teflon (PTFE)

Cited by 31 publications

References 13 publications

Robust Non-Wetting PTFE Surfaces by Femtosecond Laser Machining

Robust Non-Wetting PTFE Surfaces by Femtosecond Laser Machining

In Vitro Laser Fenestration of Aortic Stent‐Grafts: A Qualitative Analysis Under Scanning Electron Microscope

Current trend in fabrication of complex morphologically tunable superhydrophobic nano scale surfaces

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