Control of wettability of hydrogenated amorphous carbon thin films by laser-assisted micro- and nanostructuring

Pfleging, Wilhelm; Kohler, Robert Ε.; Torge, Maika; Trouillet, Vanessa; Danneil, F.; Stüber, M.

doi:10.1016/j.apsusc.2011.02.126

Cited by 34 publications

(16 citation statements)

References 27 publications

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“…material dependent surface energy), as well as on the morphology of the outermost surface (surface roughness, presence of micro and nanostructures). [34][35][36] Our hierarchical TiO 2 -ZnO nanostructures show a dramatic change of the surface wettability and we attribute this modification to different contributions, as explained below, due to the formation of a network of ZnO nanostructures at the top surface of the titania NTs. The phenomenon of surface wetting behavior is well understood and explained by either Wenzel 35 and the Cassie-Baxter 37,38 models.…”

Section: Resultsmentioning

confidence: 99%

Wetting Behavior of Hierarchical Oxide Nanostructures: TiO₂Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures

Ottone

Lamberti

Fontana

et al. 2014

J. Electrochem. Soc.

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Titania nanotubes (TiO 2 NTs) of 5 μm in length and 100 nm in the external diameter are easily formed by anodic oxidation. They are used as hollow substrates to deposit different ZnO nanostructures, such as nanoparticles and nanowires by employing two different techniques, electrodeposition and hydrothermal growth, respectively. In this way highly nanostructured and hierarchical sample surfaces were obtained, showing high level of crystallinity of both TiO 2 anatase and ZnO wurtzite materials. In addition, the wetting behavior drastically changed from the hydrophilic TiO 2 NTs surface to almost superhydrophobic surfaces of the hierarchical samples, thanks to the decoration with ZnO nanostructures. These results open interesting possibilities to employ our hierarchical TiO 2 -ZnO nanostructured materials as self-cleaning, antireflective or anti-fogging surfaces. These hierarchical and composite nanostructures could be thus efficiently used in photocatalytic devices, which would also benefit from the combination of both metal oxides for improved performances and efficiencies. Anodic oxidation1 is the process of forming an oxide on a metal surface by applying an electric potential through a suitable electrolyte. The metals that can be anodized belong to the so-called valve-metals group (Al, Ti, Zr, Nb, W, Ta, . . . ) and different kinds of ordered nanostructured oxides can be obtained. Compared with other synthesis approaches, electrochemical anodization is a simple and convenient technique to fabricate uniform layers of vertically self-oriented nanostructures. It has been widely accepted that the formation of the pores in anodic metal oxides is based on two continuous processes: the oxide dissolution at the electrolyte/oxide interface and the oxidation of metal at the oxide/metal interface.Particularly, anodic titanium oxide has attracted considerable interest since its unique properties make it useful for various functional applications, ranging from non-silicon solar cells 2-4 and photocatalysis 5 to energy storage. 6,7 In general, the morphology and the structure of the ordered layer are strongly affected by the electrochemical conditions (anodization voltage, distance between the electrodes, temperature) and the electrolyte composition. It is possible to grow titania nanotubes (NTs) with length varying between 100 nm up to 1 mm with a good control on the wall thickness and external roughness.In the present paper we report on the anodic oxidation of a titanium foil to form 5 μm long titania NTs. In order to create a hierarchical structure and then to study the wetting properties, we decorate both their inner and outer surface with zinc oxide (ZnO) nanoparticles of about 20 nm in diameter. In particular, by using two different growth techniques, it is possible to additionally enrich the planar surface of the TiO 2 NTs with either a network of ZnO nanowires using the hydrothermal approach, or with ZnO microparticles of about 150 nm using the electrodeposition method.ZnO is a n-type metal oxide semiconductor havi...

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Section: Resultsmentioning

confidence: 99%

Wetting Behavior of Hierarchical Oxide Nanostructures: TiO₂Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures

Ottone

Lamberti

Fontana

et al. 2014

J. Electrochem. Soc.

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“…Advanced functional surface patterns with high lateral resolution can be obtained by an appropriate combination of laser microstructuring or nanostructuring and laser surface modification. A flexible and rapid surface functionalization of amorphous carbon films showed a great potential for various applications such as biological surfaces and tribological systems [36]. The formation of carboxyl groups at the surface was detected, which corresponds to an improved wettability of water.…”

Section: Introductionmentioning

confidence: 94%

“…The SE has shown a linear dependence on the laser energy dose and laser pulse number, respectively. For laser fluences near the ablation threshold, a selective ablation of hydrogen-enriched domains seems to be responsible for the formation of micro-sized cones [36]. Recently, a modification of a method for CA measurement, an axisymmetric drop shape method, has also been used for wettability analysis [37].…”

Section: Introductionmentioning

confidence: 99%

Wettability and Other Surface Properties of Modified Polymers

Kasálková¹,

Slepička²,

Kolská³

et al. 2015

Wetting and Wettability

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Surface wettability is one of the crucial characteristics for determining of a material's use in specific application. Determination of wettability is based on the measurement of the material surface contact angle. Contact angle is the main parameter that characterizes the drop shape on the solid surface and is also one of the directly measurable properties of the phase interface. In this chapter, the wettability and its related properties of pristine and modified polymer foils will be described. The wettability depends on surface roughness and chemical composition. Changes of these parameters can adjust the values of contact angle and, therefore, wettability. In the case of pristine polymer materials, their wettability is unsuitable for a wide range of applications (such as tissue engineering, printing, and coating). Polymer surfaces can easily be modified by, e.g., plasma discharge, whereas the bulk properties remain unchanged. This modification leads to oxidation of the treated layer and creation of new chemical groups that mainly contain oxygen. Immediately after plasma treatment, the values of the contact angles of the modified polymer significantly decrease.In the case of a specific polymer, the strongly hydrophilic surface is created and leads to total spreading of the water drop. Wettability is strongly dependent on time from modification.Wettability plays a key role, e.g., in the development of biomaterials in tissue engineering and regenerative medicine. Biocompatibility tests of the cell adhesion, proliferation and viability are performed in an aqueous medium, and it is necessary to control the surface wettability. Various cell types have different requirements on surface properties, but while maintaining suitable parameters, the optimal value of © 2015 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.water contact angle for cell adhesion is in the interval of 50-70°. In the case of polymers, which have usually higher values of contact angles, the decrease in water contact angle and adjustment of the surface may be accomplished by introducing selected chemical groups (by plasma treatment), chemical compounds (by grafting, i.e., chemical bath deposition), or nanoparticles. In the case of grafting of polyethylene glycol (PEG) on the plasma activated high-density polyethylene was under "properly" selected conditions of modification (molecular weight of PEG, concentration of PEG in solution) prepared layers that positively influenced the cell adhesion. In addition, low concentration of gold nanoparticles increased the number of adhered cells without decreasing cell viability.Whether the surface of the polymeric substrate is attractive for the adhesion and proliferation of cells is determined not only by wettability but also by a range of other surface properties...

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“…In addition to that the use of excimer laser radiation is also of great interest because of its flat top intensity profile which enables very precise material removal and the formation of flat ablation craters within one laser pulse. Using special optics, structure sizes down to 300-400 nm can be achieved [11]. The high photon energy (6.4 eV) of excimer laser radiation is also of great interest especially for selective material removal or for ablation processes.…”

Section: Introductionmentioning

confidence: 99%

“…Laser surface texturing is an environmental friendly technique, where, a high energy density pulsed laser beam is applied on the surface to ablate material from the surface and thereby, introducing the surface roughness with preferred orientation [10]. Laser surface texturing can be applied for adjustment of surface topography and chemical properties on a nanometer scale, which in turn has an impact on wettability, protein and cell adhesion [11,12].…”

Section: Introductionmentioning

confidence: 99%

Laser surface textured titanium alloy (Ti–6Al–4V): Part 1 – Surface characterization

Pfleging

Kumari

Besser

et al. 2015

Applied Surface Science

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Control of wettability of hydrogenated amorphous carbon thin films by laser-assisted micro- and nanostructuring

Cited by 34 publications

References 27 publications

Wetting Behavior of Hierarchical Oxide Nanostructures: TiO₂Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures

Wetting Behavior of Hierarchical Oxide Nanostructures: TiO₂Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures

Wettability and Other Surface Properties of Modified Polymers

Laser surface textured titanium alloy (Ti–6Al–4V): Part 1 – Surface characterization

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Control of wettability of hydrogenated amorphous carbon thin films by laser-assisted micro- and nanostructuring

Cited by 34 publications

References 27 publications

Wetting Behavior of Hierarchical Oxide Nanostructures: TiO2Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures

Wetting Behavior of Hierarchical Oxide Nanostructures: TiO2Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures

Wettability and Other Surface Properties of Modified Polymers

Laser surface textured titanium alloy (Ti–6Al–4V): Part 1 – Surface characterization

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Product

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Wetting Behavior of Hierarchical Oxide Nanostructures: TiO₂Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures

Wetting Behavior of Hierarchical Oxide Nanostructures: TiO₂Nanotubes from Anodic Oxidation Decorated with ZnO Nanostructures