Contact angle measurements by axisymmetric drop shape analysis and an automated polynomial fit program

Rı́o, O.I. del; Kwok, Daniel Y.; Wu, Rebecca; Alvarez, Juan M.; Neumann, A. W.

doi:10.1016/s0927-7757(98)00257-x

Cited by 57 publications

(31 citation statements)

References 15 publications

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“…Unfortunately, the resulting contact angle depends highly on the polynomial degree and on the number of coordinates points [11]. Despite these delicate issues, polynomial fitting remains the method of choice when considering non-axisymmetric drops, as shown in several comparative studies [11,12].…”

Section: Introductionmentioning

confidence: 99%

A snake-based approach to accurate determination of both contact points and contact angles

Stalder

Kulik

Sage

et al. 2006

Colloids and Surfaces A: Physicochemical and Engineering Aspect

736

452

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We present a new method based on B-spline snakes (active contours) for measuring high-accuracy contact angles. In this approach, we avoid making physical assumptions by defining the contour of the drop as a versatile B-spline curve. When useful, we extend this curve by mirror symmetry so that we can take advantage of the reflection of the drop onto the substrate to detect the position of the contact points. To keep a wide range of applicability, we refrain from discretizing the contour of the drop, and we choose to optimize an advanced image-energy term to drive the evolution of the curve. This term has directional gradient and region-based components; additionally, another term-an internal energy-is responsible for the snake elasticity and constrains the parameterization of the spline. While preserving precision at the contact points, we limit the computational complexity by constraining a non-uniform repartition of the control points. The elasticity property of the snake links the local nature of the contact angle to the global contour of the drop. A global knowledge of the drop contour allows us to use the reflection of the drop on the substrate to automatically and precisely detect a line of contact points (vertical position and tilt). We apply cubic-spline interpolation over the image of the drop; then, the evolution procedure takes part in this continuous domain to avoid the inaccuracies introduced by pixelization and discretization.We have programmed our method as a Java software and we make it freely available [A.F. Stalder, DropSnake, Biomedical Imaging Group, EPFL, [ON LINE] visited 2005. http://bigwww.epfl.ch/demo/dropanalysis]. Our experiments result in good accuracy thanks to our high-quality image-interpolation model, while they show applicability to a variety of images thanks to our advanced image-energy term.

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Section: Introductionmentioning

confidence: 99%

A snake-based approach to accurate determination of both contact points and contact angles

Stalder

Kulik

Sage

et al. 2006

Colloids and Surfaces A: Physicochemical and Engineering Aspect

736

452

View full text Add to dashboard Cite

show abstract

“…With extensive applications of computers, Neumann et al [2] developed an Axisymmetric Drop Shape Analysis-Profile (ADSA-P) measurement system, which is reported to be able to improve measurement precision [5][6][7][8][9][10]. The hysteresis produced by solid surface roughness and heterogeneity has been examined [11,12], and the theoretical understanding of the relationship between the contact angle and the dimensions of the liquid drop was greatly advanced [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Contact Angle of Ethanol and n-Propanol Aqueous Solutions on Metal Surfaces

Fan

Yuan

Zhou

et al. 2011

Chem. Eng. Technol.

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The contact angles of the aqueous solution of ethanol and that of n-propanol on copper, aluminum, and stainless steel surfaces are reported. The contact angles were measured under atmospheric conditions, and then under vapor-liquid equilibrium conditions at 1 atm and different temperatures. The results showed the variations of the contact angles with the concentrations of aqueous solutions on different metal material surfaces with different roughness. Some unstable behavior of the wetting ability around the azeotropic point of a binary solution is reported. Influences of concentration, kind of materials, and the surface roughness on the wetting ability are discussed. The model for predicting the contact angle of alcohol aqueous solutions on metal surfaces under atmospheric and vaporliquid two-phase equilibrium conditions at 1 atm is derived from the Young equation.

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“…In addition, when such procedures are interpreted by an automated axisymmetric drop shape analysis-profile (ADSA-P)-complexities such as dissolution of the polymer by the liquid and slip/stick of the three-phase contact line, which affect the contact angle interpretation in terms of surface energetics, can be identified (55)(56)(57).…”

Section: Introductionmentioning

confidence: 99%

Low-Rate Dynamic Contact Angles on Poly(methyl methacrylate) and the Determination of Solid Surface Tensions

Kwok

Leung

Lam

et al. 1998

Journal of Colloid and Interface Science

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Contact angle measurements by axisymmetric drop shape analysis and an automated polynomial fit program

Cited by 57 publications

References 15 publications

A snake-based approach to accurate determination of both contact points and contact angles

A snake-based approach to accurate determination of both contact points and contact angles

Contact Angle of Ethanol and n-Propanol Aqueous Solutions on Metal Surfaces

Low-Rate Dynamic Contact Angles on Poly(methyl methacrylate) and the Determination of Solid Surface Tensions

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