Experimental studies of contact angle hysteresis phenomena on polymer surfaces — Toward the understanding and control of wettability for different applications

Grundke, Karina; Pöschel, K.; Synytska, Alla; Frenzel, Ralf; Drechsler, Astrid; Nitschke, Mirko; Cordeiro, Ana Lúcia Arcanjo Oliveira; Uhlmann, Petra; Welzel, Petra B.

doi:10.1016/j.cis.2014.10.012

Cited by 121 publications

(74 citation statements)

References 61 publications

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“…Contact angle hysteresis phenomena on polymer surfaces have been studied through CA measurements using sessile liquid droplets and captive air bubbles in conjunction with a drop shape. This method was reported to be promising also for characterization of wettability of laser treated surfaces with controlled roughness and chemical composition [37].…”

Section: Introductionmentioning

confidence: 99%

“…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]. Contact angle hysteresis phenomena on polymer surfaces have been studied through CA measurements using sessile liquid droplets and captive air bubbles in conjunction with a drop shape.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wettability and Other Surface Properties of Modified Polymers

Kasálková¹,

Slepička²,

Kolská³

et al. 2015

Wetting and Wettability

View full text Add to dashboard Cite

show abstract

“…As a practical tip, it is recommended to restrict the upper-limit to the slow-moving range (quasi-static wetting situation), which is less affected by flow dynamics, see Figure 10. During the Independent statistical analysis, independent expectation values and standard deviations of the former obtained contact angle events were calculated using Equations (40) and (41),…”

Section: Statistical Contact Angle Analyses: Independent and Dependenmentioning

confidence: 99%

“…Overall, this approach is able to investigate 96 distributions for every event, Table 2. During the Independent statistical analysis, independent expectation values and standard deviations of the former obtained contact angle events were calculated using Equations (40) and (41),…”

Section: Statistical Contact Angle Analyses: Independent and Dependenmentioning

confidence: 99%

“…Due to the fact that wetting experiments by sessile drop techniques generally cannot be performed under mechanical and thermodynamically equilibrium conditions, the equilibrium contact angle cannot be measured directly. Indeed, the measured or apparent contact angles (APCA) differ considerably from each other, which is denoted as Contact Angle Hysteresis (CAH) [37][38][39][40][41] in surface science community. The contact angle hysteresis can be calculated by the experimental available advancing θ a (wetting new surface) and receding θ r (formerly wetted surface), which together determine the CAH,…”

Section: Introduction and Brief Summary Of Basic Wetting Theoriesmentioning

confidence: 99%

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Statistical Contact Angle Analyses with the High-Precision Drop Shape Analysis (HPDSA) Approach: Basic Principles and Applications

Heib

Schmitt

2016

Coatings

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Abstract:Surface science, which includes the preparation, development and analysis of surfaces and coatings, is essential in both fundamental and applied as well as in engineering and industrial research. Contact angle measurements using sessile drop techniques are commonly used to characterize coated surfaces or surface modifications. Well-defined surfaces structures at both nanoscopic and microscopic level can be achieved but the reliable characterization by means of contact angle measurements and their interpretation often remains an open question. Thus, we focused our research effort on one main problem of surface science community, which is the determination of correct and valid definitions and measurements of contact angles. In this regard, we developed the high-precision drop shape analysis (HPDSA), which involves a complex transformation of images from sessile drop experiments to Cartesian coordinates and opens up the possibility of a physically meaningful contact angle calculation. To fulfill the dire need for a reproducible contact angle determination/definition, we developed three easily adaptable statistical analyses procedures. In the following, the basic principles of HPDSA will be explained and applications of HPDSA will be illustrated. Thereby, the unique potential of this analysis approach will be illustrated by means of selected examples.

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Characterizing the Physicochemical Processes at the Interface through Evolution of the Axisymmetric Droplet Shape Parameters

Бойнович

Emelyanenko

2018

Advances in Contact Angle, Wettability and Adhesion

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Experimental studies of contact angle hysteresis phenomena on polymer surfaces — Toward the understanding and control of wettability for different applications

Cited by 121 publications

References 61 publications

Wettability and Other Surface Properties of Modified Polymers

Wettability and Other Surface Properties of Modified Polymers

Statistical Contact Angle Analyses with the High-Precision Drop Shape Analysis (HPDSA) Approach: Basic Principles and Applications

Characterizing the Physicochemical Processes at the Interface through Evolution of the Axisymmetric Droplet Shape Parameters

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