Wettability versus roughness: Multi-scales approach

Belaud, Vanessa; Valette, S.; Stremsdoerfer, G.; Bigerelle, Maxence; Benayoun, Stéphane

doi:10.1016/j.triboint.2014.07.002

Cited by 93 publications

(61 citation statements)

References 9 publications

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“…Belaud et al created micro-and nano-sized structures on PP surfaces using fs laser pulses [57,98]. A infrared laser beam (Ti:Sapphire laser, λ = 800 nm), with a short pulse duration (130 fs in pulse length), was used in this study.…”

Section: Polypropylene (Pp)mentioning

confidence: 99%

Laser Surface Texturing of Polymers for Biomedical Applications

et al. 2018

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Polymers are materials widely used in biomedical science because of their biocompatibility, and good mechanical properties (which, in some cases, are similar to those of human tissues); however, these materials are, in general, chemically and biologically inert. Surface characteristics, such as topography (at the macro-, micro, and nano-scale), surface chemistry, surface energy, charge, or wettability are interrelated properties, and they cooperatively influence the biological performance of materials when used for biomedical applications. They regulate the biological response at the implant/tissue interface (e.g., influencing the cell adhesion, cell orientation, cell motility, etc.). Several surface processing techniques have been explored to modulate these properties for biomedical applications. Despite their potentials, these methods have limitations that prevent their applicability. In this regard, laser-based methods, in particular laser surface texturing (LST), can be an interesting alternative. Different works have showed the potentiality of this technique to control the surface properties of biomedical polymers and enhance their biological performance; however, more research is needed to obtain the desired biological response. This work provides a general overview of the basics and applications of LST for the surface modification of polymers currently used in the clinical practice (e.g., PEEK, UHMWPE, PP, etc.). The modification of roughness, wettability, and their impact on the biological response is addressed to offer new insights on the surface modification of biomedical polymers.

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Section: Polypropylene (Pp)mentioning

confidence: 99%

Laser Surface Texturing of Polymers for Biomedical Applications

et al. 2018

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“…This effect was independent of the fact that the ablation was caused by higher laser power, decreased scanning space, or smaller defocusing distance [28]. The influence of roughness changes induced by femtosecond laser on the polypropylene (PP) surface was investigated in [29], wherein the influence of multiscale roughness on CA measurements was described. An experimental investigation of the static CA measured on PP textured surfaces by a femtosecond laser with multi-scale roughness shown the dependence of the 3D roughness parameters.…”

Section: Introductionmentioning

confidence: 99%

“…An experimental investigation of the static CA measured on PP textured surfaces by a femtosecond laser with multi-scale roughness shown the dependence of the 3D roughness parameters. The proposed physical approach showed that the drop is not in such a case as in the state described by Wenzel or Cassie-Baxter, even with the roughness parameters calculated at the relevant scales [29]. The use of CO 2 laserinduced surface patterns to modify the wettability of poly(methyl methacrylate)(PMMA) with respect to the surface roughness of patterns was reported [30].…”

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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“…Classically, Wenzer and Cassie – Baxter theories explain wetting of rough interfaces. According to the Wenzer theory, a rough surface amplifies or diminishes specific energy of the liquid-solid interface proportional to a roughness factor that is the ratio of the actual surface to the geometric surface area [55]. Therefore, a rough hydrophobic surface is more hydrophobic relative to its planar form and a rough hydrophilic surface is more hydrophilic relative to its planar form according to the Wenzer theory.…”

Section: Resultsmentioning

confidence: 99%

Rough Gold Electrodes for Decreasing Impedance at the Electrolyte/Electrode Interface

Koklu

Sabuncu

Beşkök

2016

Electrochimica Acta

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Electrode polarization at the electrolyte/electrode interface is often undesirable for bio-sensing applications, where charge accumulated over an electrode at constant potential causes large potential drop at the interface and low measurement sensitivity. In this study, novel rough electrodes were developed for decreasing electrical impedance at the interface. The electrodes were fabricated using electrochemical deposition of gold and sintering of gold nanoparticles. The performances of the gold electrodes were compared with platinum black electrodes. A constant phase element model was used to describe the interfacial impedance. Hundred folds of decrease in interfacial impedance were observed for fractal gold electrodes and platinum black. Biotoxicity, contact angle, and surface morphology of the electrodes were investigated. Relatively low toxicity and hydrophilic nature of the fractal and granulated gold electrodes make them suitable for bioimpedance and cell electromanipulation studies compared to platinum black electrodes which are both hydrophobic and toxic.

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Wettability versus roughness: Multi-scales approach

Cited by 93 publications

References 9 publications

Laser Surface Texturing of Polymers for Biomedical Applications

Laser Surface Texturing of Polymers for Biomedical Applications

Wettability and Other Surface Properties of Modified Polymers

Rough Gold Electrodes for Decreasing Impedance at the Electrolyte/Electrode Interface

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