Using complete or part of drop shape for measurement of dynamit contact angle. Highprecision drop shape analysis on inclining flat. Axisymmetric finite element modeling for the design and. Low bond axisymmetric drop shape analysis this model is derived from a first order perturbation solution of the laplace equation for axisymmetric drops. Do you still use a contact angle meter based on circle or. Development of axisymmetric drop shape analysis no apex adsana ali kalantarian doctor of philosophy graduate department of mechanical and industrial engineering university of toronto 2011 the main purpose of this thesis is the development of a new methodology of contact angle measurement called adsana axisymmetric drop shape analysis. In this context, water drops onto a 111 silicon wafer are dynamically measured by video recording and by inclining the surface, which results in a sequence of nonaxisymmetric drops. Further development of axisymmetric drop shape analysis captive bubble for pulmonary surfactant related studies y. The manual technique of drawing a circle or ellipse onto a crosssectional image of a sessile drop allows an estimate of the true circularity or otherwise of the droplet image. Adsa is defined as axisymmetric drop shape analysis somewhat frequently. Application to circular reservoirs cristiano yudok chung rodrigues abstract the present paper addresses the linear analysis of axially symmetric structures of thin shell subjected to axisymmetric loads. A drop shape analysis technique called axisymmetric drop shape analysis. A drop shape analysis technique called axisymmetric drop shape analysis adsa has been developed in our laboratory over the last twenty years. Nonaxisymmetric drop shape analysis and its application for determination of the local contact angles.
A pythonbased, axisymmetric drop shape analysis adsa library to measure the interfacial tension and the young contact angle of a droplet description. Adsap is a novel technique to determine liquidfluid interfacial tensions and contact angles from the shape of axisymmetric menisci i. During this procedure, the drop shape is split in two parts right and left at the highest point of the drop shape x max. It implements 1 dropsnake for shaping the drop and 2 lbadsa, based on the fitting of the young. Pdf a drop shape analysis technique called axisymmetric drop. The drop instrument and computer program is developed at the university of oslo. In an axisymmetric drop shape analysis of surface tension, the pendant drop geometry is preferable because large drops can be made axisymmetric easily. An especially large number of studies, which use contact angle measurements to analyse surfaces, are characterised by incorrect or misdirected conclusions such as the determination of surface energies from poorly performed contact angle determinations. Abstract a drop shape analysis technique called axisymmetric drop shape analysis adsa has been developed in our laboratory over the last twenty years. Soon commercial apparatus became available, but anyway the budget was of the order of several tenthousand dollars. This program can be used to analyze the shape of a drop to extract surface tension at high accuracy. Perturbation solution of the shape of a nonaxisymmetric.
Statistical contact angle analyses with the highprecision. Perturbation solution of the shape of a nonaxisymmetric sessile drop. Axisymmetric drop shape analysis adsa is a computer software package developed in our laboratory 18. Axisymmetric drop shape analysis adsa and its applications p. Axisymmetric drop shape analysis adsa by sameh mossaad. Picture of drop instrument for axisymmetric drop shape analysis. The droplet is continuously monitored by adsa in realtime. Drop shape analysis sessile drop adsa coal ash slag abstract a new method based on the younglaplace equation for measuring contact angles and surface tensions is presented.
Computational methods for the measurement of interfacial properties from the shape and dimensions of pendant and sessile drops, journal of colloid and interface science on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. A new application of the axisymmetric drop shape analysis adsa has been developed, using the pendant drop. Excellent drop shape analysis based interfacial chemistry. It consists in analysing the shape of a drop hanging typically from a capillary tube and about to detach sometimes the inverse situation of a bubble forming at the bottom of a liquid is preferred, or that of a sessile drop or bubble. Lowbond axisymmetric drop shape analysis for surface tension. With this approach, the whole drop shape is used to provide global information, nevertheless, the contact angle measurement remains local and similar to a polynomial fit. Axisymmetric drop shape analysis adsa 711 is a drop shape technique now extensively used for surface tension and contact angle measurement. The linear triangular shape functions are illustrated below. Measurement of surface and interfacial tension using. Implementation of an axisymmetric drop shape apparatus. Mar 26, 2018 axisymmetric drop shape analysis adsa is a computer software package developed in our laboratory 18. Actually, adsad only has a accuracy with 3% for measuring contact angle compared with adsarealdrop method. Implementation of an axisymmetric drop shape apparatus using.
Bubble and drop interfaces 1st edition reinhard miller. The software packages 810 include an angle measurement tool wherein a line is. This software is an addon for the public domain image processing software imagej which matches a theoretical profile to the contour of a pendent drop, either interactively or by automatically minimising. The drop profiles are analysed by commercial software and by the developed and presented highprecision drop shape analysis. Evaluation of interfacial tension by image processing of. A new technique called axisymmetric drop shape analysis height and diameter adsahd has been developed to estimate interfacial tensions from the height and diameter of sessile and pendant drops. In this context, water drops onto a 111 silicon wafer are dynamically measured by video recording and by inclining the surface, which results in a sequence of non axisymmetric drops. Lowbond axisymmetric drop shape analysis for surface. Therefore, even if the software is highly accurate, an inaccurate density input would. The drop shape is determined by a contour following algorithm, and the profile coordinates are use to calculate the surface tension, contact angle and the area and. How is axisymmetric drop shape analysis by profile abbreviated. Capillary pressure tensiometry and applications in.
Axisymmetric drop shape analysis with synth this site is a collection of tips, documentations, scripts and source codes for synth. A streamlined version of adsa over the past several decades is presented. Further development of axisymmetric drop shape analysis. Numerical simulations using numerically generated drop profiles were used to evaluate the accuracy and applicability of the methods. Computational methods for the measurement of interfacial properties from the shape and dimensions of pendant and sessile drops, j. Axisymmetric drop shape analysis profile adsap axisymmetric drop shape analysis adsa system. It relies on the best fit between theoretical curves with known surface tension values and an experimental profile. Low bond axisymmetric drop shape analysis this model is derived from a first order perturbation solution of the. Adsa axisymmetric dropshape analysis acronymfinder. Computational methods for the measurement of interfacial properties from the shape and dimensions of pendant and sessile drops. A spline curve is used to fit complete or part of drop shape, and contact angle can be calculated via the. Adsa is a powerful technique for the measurement of interfacial tensions and contact angles of pendant drops, sessile drops, and bubbles. Its basic principle is to fit the experimental drop profile.
Spining drop tensiometer with contact angle meter was made by usa kino. Adsarealdrop method is optimize and can be used to measure contact angle of non axisymmetric drop shape. The software consists of an image analysis process and a numerical method for the calculation ofinterfacialtension,contactangle,dropvolume,anddropsurfacearea. Axisymmetric finite element modeling for the design and analysis of cylindrical adhesive joints based on dimensional stability by paul e. Drop shape analysis is one of the most important and frequently used methods to characterise surfaces in the scientific and industrial communities. A spline curve is used to fit complete or part of drop shape, and contact angle can be calculated via the fitting method described in quadratic polynomial fitting method. Based on the fitting of the younglaplace equation to the image data, droptoolkit calculates the interfacial tension and the young contact angle of a droplet sessile or pendant. Drops and bubbles in interfacial research, volume 6 1st. Provides assistance for calculating contact angles and surface tensions. A new technique called axisymmetric drop shape analysisheight system that can be represented by the laplace equation of and diameter adsahd has been developed to estimate interfacial tensions from the height and diameter of sessile and pendant capillarity. Adsap stands for axisymmetric drop shape analysis by profile. In the end of 1980s, with the development of computer technology, commercialized contact angle meter used the image analysis technique to measure the contact angle by capturing the drop image, finding the drop edge from captured image, then fitting the drop profile by the circle, ellipse, tangent polynomial, composite type equation or spline.
Axisymmetric drop shape analysis with anisotropic interfacial stresses james k. The younglaplace method also called axisymmetric dropshape analysis adsa 27 is the only curvefitting method with a physical basis, as it analyzes the drop shape based on the young. The key property of a functioning lung surfactant is its surface tension, which can reach extremely low values below 1 mjm2. 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. A precise goniometertensiometer using a low cost single. We apply cubicspline interpolation over the image of the drop. Diagram of the closedloop axisymmetric drop shape analysis adsa feedback control system integrated into the constrained drop surfactometer cds. Early efforts in the analysis of axisymmetric drops. We initially present the mathematical framework of our algorithm and then we validate our software tool against other wellestablished adsa packages, including the commercial ramehart dropimage advanced as well as the. Images of the drop are captured during the exposure and analyzed using the axisymmetric drop shape analysis software to yield surface tensions over time. This evolution transformed the drop shape technique from a niche calibration procedure into a daily measurement routine, that was known as axisymmetric drop shape analysis adsa. Neumanna, adepartment of mechanical and industrial engineering, university of toronto, 5 kings college road, toronto, on, canada, m5s 3g8 bdivision of engineering science, faculty of applied science and engineering, university of toronto, 40 st. Adsap is defined as axisymmetric drop shape analysis by profile rarely.
Sep, 2006 axisymmetric drop shape analysis adsa is a powerful technique for the measurement of interfacial properties from the shape of dropsbubbles. Several configuration of interest will be considered and presented systematically. Recent progress in axisymmetric drop shape analysis adsa. The software consists of image analysis and numerical schemes. Dec 15, 1997 a new technique called axisymmetric drop shape analysis height and diameter adsahd has been developed to estimate interfacial tensions from the height and diameter of sessile and pendant drops. Superhydrophobic ceramic coatings by solution precursor. Axisymmetric drop shape analysis adsa is a commonly used drop shape technique. The pendent drop method for surface tension measurement consists in analysing the shape of an axisymmetric drop hanging from a capillary tube. A new technique called axisymmetric drop shape analysisheight system that can be represented by the laplace equation of and diameter adsahd has been developed to estimate interfa cial tensions from the height and diameter of sessile and pendantcapillarity. The single limit was the cost of the new technique. The lowbond axisymmetric drop shape analysis lbadsa method 5 uses an image energy approach to fit a firstorder approximation of the younglaplace equation to the whole image data instead of first detecting the drop contour.
Dynamic interfacial tension measurement method using. Adsa is a surface tension measurement methodology first introduced by rotenberg et al. As a result, a more versatile image analysis module is introduced. Lyon, master of science utah state university, 2010 major professor. In the work reported here, a more accurate and less subjective method is obtained by redeveloping the whole approach in the framework of axisymmetric drop shape analysis adsa. Lowbond axisymmetric drop shape analysis for surface tension and contact angle measurements of sessile drops a. This software estimates contact angles via the guidance provided by the global drop contour. Usa kino first adopted function of image editor at drop shape analysis software cast3. Automated droplet manipulation using closedloop axisymmetric. Adsa is a drop shape method that has been used widely to analyze liquidfluid interfaces 12. In this study, axisymmetric drop shape analysis adsa was applied to investigate the ability of a hybrid technique i. Highprecision drop shape analysis on inclining flat surfaces. The advantage is that both sides of the drop shape can be fitted individually, allowing the analysis of even highly nonasymmetric drop shapes of sticking droplets, e.
World leading drop shape analysis system c60 contact angle. Adsa, based on the shape of liquid uid interfaces, is complex but is adaptable to a variety of experi mental circumstances including pendant drops, sessile drops and bubbles. The strategy employed is to construct an objective function which expresses the deviation of the physically observed. And, cast provides function of recaluculation which can be used to calculate the contact angle or surface tension by setup method for captured drop images. How is axisymmetric drop shape analysis abbreviated. The greatest accuracy is achieved with fewer and very accurate points on the drop surface rather than a large number of less reliable. Jan 28, 2016 the pendent drop method for surface tension measurement consists in analysing the shape of an axisymmetric drop hanging from a capillary tube. T1 measurement of surface and interfacial tension using pendant drop tensiometry. First, single or several dynamic images of dropbubble are captured for us to analyze its key information like drop shape edge and geometric dimension via sub.
Evaluation of interfacial tension by image processing of the. Axisymmetric drop shape analysis for estimating the. Surface tension measurements can be obtained in real time and the acute inhalation toxicity profile of a test article can be. A monolayer is spread on the surface of a drop of a buffer solution suspended from a capillary, which is the outer one of an. Using this global model of a drop, contact angles are obtained considering the whole drop profile. World leading drop shape analysis system c60 parallel background light and telecentric lens automatic rotating stage with resolution of 0. Drop shape analysis is based on a first order perturbation solution of the younglaplace equation for axisymmetric sessile drops. A new technique called axisymmetric drop shape analysis height system that can be represented by the laplace equation of and diameter adsahd has been developed to estimate interfacial tensions from the height and diameter of sessile and pendant capillarity. Contact angles were determined using imagej software with lowbond axisymmetric drop shape analysis lbadsa 19 plugin for droplet shape approximation. A new technique called axisymmetric drop shape analysisheight and diameter adsahd has been developed to estimate interfacial tensions from the height and diameter of sessile and pendant drops. It uses digital image analysis to detect the edge of a drop and determines a number of surface parameters including the interfacial tension.