A robust algorithm for the simultaneous parameter estimation of interfacial tension and contact angle from sessile drop profiles

Dingle, Nicole M.; Harris, Michael T.

doi:10.1016/j.jcis.2005.01.087

Cited by 18 publications

(15 citation statements)

References 26 publications

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“…The experimental facility employed for surface tension measurements of coal ash slags complies with a typical sessile drop setup [27][28][29][30]. An outline of the arrangement is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Low-bond axisymmetric drop shape analysis for surface tension and contact angle measurements of sessile drops

Stalder¹,

Melchior²,

Müller³

et al. 2010

Colloids and Surfaces A: Physicochemical and Engineering Aspect

602

400

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a b s t r a c tA new method based on the Young-Laplace equation for measuring contact angles and surface tensions is presented. In this approach, a first-order perturbation technique helps to analytically solve the Young-Laplace equation according to photographic images of axisymmetric sessile drops. When appropriate, the calculated drop contour is extended by mirror symmetry so that reflection of the drop into substrate allows the detection of position of the contact points. To keep a wide range of applicability, a discretisation of the drop's profile is not realised; instead, an optimisation of an advanced image-energy term fits an approximation of the Young-Laplace equation to drop boundaries. In addition, cubic B-spline interpolation is applied to the image of the drop to reach subpixel resolution. To demonstrate the method's accuracy, simulated drops as well as images of liquid coal ash slags were analysed. Thanks to the high-quality image interpolation model and the image-energy term, the experiments demonstrated robust measurements over a wide variety of image types and qualities. The method was implemented in Java and is freely available [A.F. Stalder, LBADSA, Biomedical Imaging Group, EPFL,

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Section: Methodsmentioning

confidence: 99%

Low-bond axisymmetric drop shape analysis for surface tension and contact angle measurements of sessile drops

Stalder¹,

Melchior²,

Müller³

et al. 2010

Colloids and Surfaces A: Physicochemical and Engineering Aspect

602

400

View full text Add to dashboard Cite

show abstract

“…The liquid is contained in a syringe from which a droplet is deposited onto the substrate, and a high resolution camera captures the image. The drop can then be analyzed either by eye (using a protractor) or using image analysis software to calculate contact angle, surface and interfacial tension, wettability and absorption (Allen, 2003;Dingle and Harris, 2005 The most widely employed method for contact angle studies is to measure the angle of a sessile drop resting on a flat solid surface using a goniometer-microscope equipped with an angle-measuring eyepiece or a video camera equipped with a suitable magnifying lens, interfaces with a computer and an image-analysis software to determine the tangent value precisely on the captured image. Contact angles are obtained at intervals over a period of time.…”

Section: Sessile Drop Methodsmentioning

confidence: 99%

“…An advantage of of the sessile drop method is that, the large solid surface allows multiple droplet evaluation. Reproducibility of the surface measured contact angle values will reflect the heterogeneity of the surface's energy properties (Allen, 2003;Dingle and Harris, 2005;Drelich et al, 2002;Ho et al, 2010). Contact angle is one of the most widely used techniques in the surface characterization and wettability of pharmaceuticals formulations.…”

Section: Sessile Drop Methodsmentioning

confidence: 99%

“…where g is gravitational constant, Δρ is the difference in densities between tile drop and its surroundings and D is the equatorial diameter of the drop at the apex and H is the shape factor that contains the properties of the fluid (Arashiro and Demarquette, 1999; Dingle et al, 2005;Hernández-Baltazar and Gracia-Fadrique, 2005). Dynamic surface tension of biological fluids (Trukhin et al, 2001), surfactants and protein complexes (Krägel et al, 2003) and surface tension of viscous solutions are some of the examples which employ this method to measure surface tension.…”

Section: Wwwintechopencommentioning

confidence: 99%

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Experimental and Computational Methods Pertaining to Surface Tension of Pharmaceuticals

Jouyban¹,

Fathi-Azarbayjan²

2012

Toxicity and Drug Testing

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“…Static contact angles could then be calculated by the software through analyzing the shape of the water drop. 9 …”

Section: Contact Anglementioning

confidence: 99%

Surface characterization and properties of functionalized nonwoven

Wei

Hou

et al. 2007

J of Applied Polymer Sci

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Nonwoven materials have been increasingly used in many industries. The surface properties of nonwoven materials are of importance in these applications. In this study, functional nonwoven materials were prepared by sputtering deposition of copper (Cu), zinc oxide (ZnO), and polytetrafluoroethylene (PTFE) on the surface of polypropylene (PP) fibers. Atomic Force Microscopy (AFM) and Environmental Scanning Electron Microscopy (ESEM) were employed to study the surface morphology and chemical compositions. The observations by AFM revealed the formation of functional nanostructures on the fibre surfaces and the ESEM examination confirmed the formation of functional compositions on the fiber surface. The metallic coating of Cu significantly improved the surface conductivity of the material. The transmittance analysis indicated that the ZnO coating obviously increased the ultra-violet absorption of the material. The surface hydrophobicity of the nonwoven material was enhanced by the sputter coating of PTFE.

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A robust algorithm for the simultaneous parameter estimation of interfacial tension and contact angle from sessile drop profiles

Cited by 18 publications

References 26 publications

Low-bond axisymmetric drop shape analysis for surface tension and contact angle measurements of sessile drops

Low-bond axisymmetric drop shape analysis for surface tension and contact angle measurements of sessile drops

Experimental and Computational Methods Pertaining to Surface Tension of Pharmaceuticals

Surface characterization and properties of functionalized nonwoven

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