Superhydrophobic laser ablated PTFE substrates

Toosi, Salma Falah; Moradi, Sona; Kamal, Saeid; Hatzikiriakos, Savvas G.

doi:10.1016/j.apsusc.2015.05.026

Cited by 58 publications

(16 citation statements)

References 46 publications

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“…The nanostructures were around 300 nm, showing a water contact angle of as high as 154.6° and a sliding off angle of as low as 5.5°. Toosi et al [177] applied femto-second laser irradiation and the template free method to develop superhydrophobic PTFE micro-nano hierarchical structures and investigated the effects of fluence, scanning speed, and beam over-lap on surface morphology and wettability. Results showed that a superhydrophobic surface (160°) was created at the condition of a laser frequency of above 28 J/m 2 and a scanning speed of lower than 0.5 mm/s.…”

Section: Bio-inspired Superhydrophobic Superhydrophilic and Supementioning

confidence: 99%

Bio-Inspired Polymeric Structures with Special Wettability and Their Applications: An Overview

2017

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Abstract:It is not unusual for humans to be inspired by natural phenomena to develop new advanced materials; such materials are called bio-inspired materials. Interest in bio-inspired polymeric superhydrophilic, superhydrophobic, and superoleophobic materials has substantially increased over the last few decades, as has improvement in the related technologies. This review reports the latest developments in bio-inspired polymeric structures with desired wettability that have occurred by mimicking the structures of lotus leaf, rose petals, and the wings and shells of various creatures. The intrinsic role of surface chemistry and structure on delivering superhydrophilicity, superhydrophobicity, and superoleophobicity has been extensively explored. Typical polymers, commonly used structures, and techniques involved in developing bio-inspired surfaces with desired wettability are discussed. Additionally, the latest applications of bio-inspired structures with desired wettability in human activities are also introduced.

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Section: Bio-inspired Superhydrophobic Superhydrophilic and Supementioning

confidence: 99%

Bio-Inspired Polymeric Structures with Special Wettability and Their Applications: An Overview

2017

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“…By manufacturing different types and depth patterns on material surfaces, we can obtain different levels of material surface wettability. In a study, a femtosecond laser was employed to fabricate the micro or nano pattern on the polytetrafluoroethylene substrate [11]. The process parameters, such as the scanning speed, fluence, and beam overlap were adjusted, and uniaxial and biaxial patterns were produced to investigate the wettability of the patterns [11].…”

Section: Introductionmentioning

confidence: 99%

“…In a study, a femtosecond laser was employed to fabricate the micro or nano pattern on the polytetrafluoroethylene substrate [11]. The process parameters, such as the scanning speed, fluence, and beam overlap were adjusted, and uniaxial and biaxial patterns were produced to investigate the wettability of the patterns [11]. The results revealed that the biaxially scanned samples had superhydrophobicity properties and exhibited high contact angles and low contact angle hysteresis.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Hydrophilic Surface on Rigid Gas Permeable Contact Lenses to Enhance the Wettability Using Ultraviolet Laser System

et al. 2019

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The widely used rigid gas permeable (RGP) contact lenses provide higher oxygen permeability and tear exchange rate than do soft contact lenses. However, their wettability warrants improvement to enhance the wearing comfort. This study used UV laser (wavelength = 355 nm) to modify the surface properties of RGP contact lenses with materials of Boston XO® (Bausch & Lomb Incorporated). Briefly, the mesh pattern was fabricated on the RGP contact lens surface by using the laser and smoothed by using oxygen plasma; the enhanced hydrophilic efficiency was analyzed using contact angle measurement. The experiment results indicated that the contact angle of the lens material decreased by approximately 10°–20° when the pitch of mesh pattern was <50 μm under a 500-mm/s scanning speed. The oxygen plasma enhanced surface wettability with a decreased contact angle (40°). The hydrophilic characteristic of the UV laser and oxygen plasma–treated surface was twice that of oxygen plasma–treated and untreated surfaces. In the future, RGP contact lens edges could be treated with UV laser and oxygen plasma to enhance the tear wettability and wearing comfort.

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“…The introduction of a micro-and nanoscale roughness onto the surface of a low surface energy material as PTFE is the best option to get superhydrophobic surfaces. This "hierarchical" surface morphology can be reproduced by different physical or technological procedures: the emulsion of metallic particles with PTFE [20,21], PTFE coating surface treatment with plasma [22][23][24][25][26][27][28][29] or Nd:YAG laser ablation, among other laser technologies [30][31][32][33][34][35][36][37], are an example of this. Other research work has addressed metals, which are roughened and then chemically treated to decrease their surface energy [38], or incorporating directly surface roughness or micro-texture on a hydrophobic material [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

“…Sandpaper polishing (sanding) [44] and sandblasting [45] are well-known routes with direct scaling-up. Laser ablation is also used to modify the surface of coated materials [30,46]. The conditions of ablation may be largely varied, and it further allows the surface patterning.…”

Section: Introductionmentioning

confidence: 99%

Water-Repellent Fluoropolymer-Based Coatings

et al. 2019

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Fluoropolymer-based coatings are widely used for release applications. However, these hydrophobic surfaces do not reveal a significantly low adhesion. Water repellency incorporated to fluoropolymer coatings might enhance their release performance. In this work, we focused on the surface texturing of a well-known polytetrafluoroethylene (PTFE)-based coating. We explored as texturing routes: sanding, sandblasting and laser ablation. We examined the surface roughness with white light confocal microscopy and the surface morphology with environmental scanning electron microscopy (ESEM). Water-repellent fluoropolymer coatings were reproduced in all cases, although with different degree, parametrized with bounces of water drops (4–5 μL). Laser ablation enabled the lowest adhesion of coatings with 24 ± 2 bounces. This result and the current development of laser patterning for industry assure the incipient use of laser ablation for release coatings.

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Superhydrophobic laser ablated PTFE substrates

Cited by 58 publications

References 46 publications

Bio-Inspired Polymeric Structures with Special Wettability and Their Applications: An Overview

Bio-Inspired Polymeric Structures with Special Wettability and Their Applications: An Overview

Fabrication of Hydrophilic Surface on Rigid Gas Permeable Contact Lenses to Enhance the Wettability Using Ultraviolet Laser System

Water-Repellent Fluoropolymer-Based Coatings

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