In the following you will learn about the possibilities that the optical analysis of drop contours offers and about our oca models with their extensive range of accessories and intuitive software control. Dynamicstatic optical contact angle meter interfacial. You can then calculate the contact angle using the formula. Optical metrology software development image processing. Contact angle measurements using the drop shape method. The shape that a drop takes on a surface depends on the surface tension of the fluid and the nature of the surface. Originally the program was conceived to assess the angle between north and a given point on any map open on the screen, therefore the background of the application window is transparent and the angle is measured from the positive yaxis and clockwise. The complexity of contact angle analysis ranges from. An equilibrium of vectorial forces dictates the contact angle. The position of the drop in the image remains unchanged when the viewing angle is adjusted. It has manual dispensing with camera interface for measuring contact angle of liquids on solid surfaces.
A patented half angle measurement method eliminates the difficulties associated with tangent angle measurement methods. Contact angle measurement cnet download free software. The optical contact angle measuring and contour analysis systems of the oca series are high precision optical measuring devices for the measurement of interfacial parameters and phenomena. Measure length, area, angle and circumference you can measure both the length, area, circumference or angle of an object with image measurement. This rapid and straightforward method makes the measurement of contact angles. Ic measure measure onscreen lengths, angles, circles. Unquestionably, the most accurate means of measuring the contact angle of a sessile drop is by compu. New, innovative software advance drop shape for contact angle measurement intuitive user interface, powerful video analysis and a wide range of functions with advance drop shape, we have developed a new, innovative software package for measuring contact angle. Contact angle measurement system contact angle measurement systemis a tool to study the wetting behaviour of a liquid on solid. The other method is done by tilting either the sample stage or the whole instrument with the tilting cradle. How to measure a contact angle without using sophisticated. The contact angle plugin is designed to provide angles for images with the droplets upside down. Measuring the threephase contact angle of nanoparticles.
The first contact angle goniometer was designed by dr. Free view, show, create and edit ms powerpoint presentations. Compared with the traditional measurement instruments, this instrument has the advantage of simplicity, compact size, and portability. Simple, accurate method for contact angle measurement tech briefs. With advance drop shape, kruss has developed a new, innovative software package for measuring contact angle and determining surface free energy sfe. Refined software makes this an affordable solution to many industrial and academic measurement tasks. All the methods are measuring advancing and receding contact angles which are used to calculate contact angle hysteresis. C at the three phase contact line of a deposited drop. A bespoke contact angle measurement software and experimental. The camera may be placed to either look exactly horizontally at the drop or look down at, say, 3. It is shown how this method can be implemented with many currentlyavailable cellphone models. Contact angle measurement combines high technology test instrumentation and a nondestructive testing method to allow an accurate, objective and repeatable analysis to be made. This system is established with the contact angle and surface tension measurement experiment which is based on foxzisman theory.
This instrument has been furnished with a 4 rotating wafer support stage and automated tilting base option. Oca optical contact angle measuring and contour analysis systems. Contact angle measurement using imaging method youtube. With advance drop shape, we have developed a new, innovative software package for measuring contact angle and determining surface free energy sfe. The wellknown young equation describes the balance at the threephase contact of solidliquid and gas. The performance of this instrument was tested first with ideal synthetic drop profiles. In our experience, confirmed by the literature as well, the maximum volume, whose profile as a.
Using the contact angle meter you can compare the effects of a range of surface treatments and gather data that correlates to various surface conditions e. This includes prepared and flexibly modifiable templates for new measurements which ensure exact reproducibility of measuring conditions. The angle formed between the liquidsolid interface and the liquidvapor interface is the contact angle. Onscreen protractor is a simple java application that allows to measure an angle on the screen. For droplets with contact angles above 10 o, a polynomial curve is fitted to the droplet edge. The contact angle of a liquid drop on a solid surface is defined by the mechanical equilibrium of the drop under the action of three interfacial tensions. The possibility of estimating solid surface tensions from contact angles relies on a relation which has been recognized by young in 1805. All of these need special ways to measure contact angle.
Contact angle measurement has wide application in studying the wettability of a surface. Angle measurement cnet download free software, apps. The instrument of choice to measure contact angles and dynamic contact angles. Contact angle experiment please note that this experiment is not in the p. The complete range of contact angle meters goniometers theta theta lite theta qc. Contact angle measuring instrument dsa100 measurement with nicely deposited drops keywords. New, innovative software advance drop shape for contact. The technique of the sessile drop is today the most widely used method to measure this parameter. The contact angle wetting angle is a measure of the wettability of a solid by a liquid. Portable optical contact angle meter interfacial tensiometer. The contact angle measurement device goniometer, located in the georgia tech biocleanroom, is a software driven instrument providing automated digital contact angle measurements.
A raw image from iphone 6s frontfacing camera with pdmslens. There are a range of techniques available in the common image manipulation programs like coreldraw 8 and adobe photoshop 9. The angle formed at the boundary of the droplet is the contact angle, which characterizes a surfaces wettability. They are often dependant of one measurement setup, and may fail under nonstandard conditions. For more information on contact angle, click on one of the products below or view the complete range via the following link. Track the development of your measurements with image measurement and generate reports to use for documentation. Measure length, area, angle and circumference on images with image measurement. All of these methods have their pros and cons which makes some more suitable for certain types of substrates and applications. I used attension theta to measure the water contact angle of my sample. Or can anyone recommend any free software or codes to measure contact angle. Contact angle goniometer, low price measurement instrument. You can measure both the length, area, circumference or angle of an object with image measurement. In surface science, an instrument called a contact angle goniometer is used to measure static contact angle, advancing and receding contact angle, and in some cases, surface energy.
Dynamic contact angle measurements quantify contact angle hysteresis the difference between advancing and receding contact angles, rolloff angle and absorption which can be useful for both nonabsorbing and spongelike materials. Mar 30, 2018 an automatic contact point detection algorithm was developed to allow the instrument to correctly detect the drop contact points. Students doing this experiment should go directly to ncb 228. The commercial softwares available today are still very limited. Now, we can use laptops, computers, tablets or smart phones to measure the angle of anything, around us anytime, anywhere. There are two methods for measuring dynamic contact angles with the attension theta optical tensiometer. The contact angle goniometer comes complete with userfriendly measurement software. Contact angle measurements, by providing information on the properties of a surface, such as wettability and surface energy, are of growing importance in countless branches of science and technology. Static angle and advancing angle are quantitative measures of the wetting of a solid by the liquid, but they can also be used as a quality control measure in. In the following you will learn about the possibilities that the optical analysis of drop contours offers and about our oca models with. William zisman of the united states naval research laboratory in washington, d. The contact angle is the angle at the point where this baseline meets the droplet edge. If you want to measure something bigger, you can take a picture and upload it, then move the center point of the protractor to measure its angle. New, innovative software advance drop shape for contact angle measurement intuitive user interface, powerful video analysis and a wide range of functions with advance drop shape, we have developed a new, innovative software package for measuring contact angle and determining surface free energy sfe.
Dyne technology offers a range of contact angle meters for surface energy testing of films or solid substrates. The necessity to have a selfdeveloped software comes by considering that. If we assume the drop to be spherical, the contact angle can be estimated by multiplying the angle between the base and the height of the droplet by 2. Measuring the threephase contact angle of nanoparticles at. Optical tensiometer contact angle meter dyne technology. Find, read and cite all the research you need on researchgate. Since then oeg gmbh develops and produces iamge processing based optical measuring instruments for industry and research. The green lines in the image define boundaries of a region of interest roi, which is the part of the image that will be used for edge detection. In this study, a smartphonebased contact angle measurement instrument was developed. In our contact angle software, the baseline is defined by the user.
Needle method is the first one of the optical methods. The integrated pump delivers accurate droplets in steps of 0. In our experience, confirmed by the literature as well, the maximum volume, whose profile as a sphere shape. This emphasizes the point that contact angle measurement uncertainty is almost entirely due to baseline uncertainty. New, innovative software advance drop shape for contact angle. Jul 19, 2016 measure the contact angle of the drop in the image e.
The common direct measurement of contact angles of a liquid drop on a flat and smooth solid is not applicable to powders and dry porous foods. You cant calculate the contact angle without knowing where the droplet edge meets the baseline. Objective to explore the concepts of surface free energy, adhesion and wetting by measuring the contact angle of a series of liquids on a polytetrafluoroethylene teflon substrate. Does anyone know how to use matlab to measure contact angle of droplets. Measuring the threephase contact angle of nanoparticles at fluid interfaces.
Actually, material such as fiber especially measuring contact angle between resin and single fiber, or single fiber with superhydrophobic surface, powder with contact angle above 80. Contact angle is the angle formed by a liquid at the phase boundary where a liquid, gas and solid intersect. In a laboratory setting, in vitro wettability can be quantified by measuring the contact angle. Advance drop shape is a common software platform for all kruss laboratory instruments and mobile solutions for analysing the wetting of solid surfaces. Simple, accurate method for contact angle measurement. Therefore, dynamic contact angle measurement can indicate chemical and topographical heterogeneity. Boeing, lockheed martin, intel, apple, formlab, government agencies and schools, snapon, mactool, msc, spi, fowler.
Free software for high precision contact angle measurement. Where the curve crosses the baseline, its tangent is used to determine the contact angle. Quick tutorial on using imagej to process contact angle data. Klonk image measurement, free, software, tool, image. Simple and lowcost contact angle measurements using a. How can i get a good contact angle value from the dropletsample surface image. Figure 5 shows a screenshot of the software measuring a droplet b. Measurements can be taken using live or still images and is designed for both macroscopic and microscopic measurement tasks.
Surftens is a windows image processing software for measurement of contact angle of liquids on solids. Contact angle measurement equipment uk dyne testing. Contact angle measurement with sca 20 sca 21 surface energy with the sca 21 software module the surface energy of solids can be determined by measuring multiple contact angles with different liquids. Surftens contains surftens pd measurement of surface tenison using the pendant. This approach is inherently imprecise since the apex is a flat region covering a range of angles. Baseline inaccuracy is the primary contributor to contact angle inaccuracy. This is achieved particularly quickly and easily with our dsa100.
The root goni refers to angle while meter refers to measuring device. This method does not require complicated image capture and analysis hardware and software. Reliable surface energy measurement and a number of easytouse features make the cheminstruments camplus contact angle meter an ideal testing machine. Jan 31, 2017 clinically, this can be observed by viewing the interaction between the tears and the lens surface. Contact angle measurement and contact angle interpretation. The contact angle plugin is designed to provide angles for images with the. This plugin calculates the contact angle of a drop on a flat surface using the sphere approximation theta2atan2hl and the ellipse approximation. This paper presents a contact angle measurement system developed using simple apparatus.
Thus a goniometer is a measuring device for angles. The authors suggest that having a standardized method for each technique would be helpful to eliminate interlaboratory variation, as would the addition of using more than one method to investigate each contact lens material. Contact angle measuring instrument dsa100 processor tensiometer k100 with care to accuracy. Jan 14, 2010 measuring the threephase contact angle of nanoparticles at fluid interfaces. In fact people often perform contact angle measurements, by applying the sphere. Two different contact angle calculation methods, younglaplace and polynomial fitting methods, were implemented in this instrument.
Contact angle measurements using cellphone cameras to. If you want to measure something that is small, just place it on the screen and measure it directly. Pdf measuring the contact angle using imagej with contact. Ic measure contains many measurement tools, including tools for the measurement of lengths, angles, circles and polygons. Oca optical contact angle measuring and contour analysis. Contact angle is defined geometrically as the angle formed by a liquid at the threephase boundary where a liquid, gas and solid intersect. Phenomenon like spreadability, absorption, adsorption, dissolution can be studied by contact angle measurement devices. Dynamic contact angle measurements quantify contact angle hysteresis the difference between advancing and receding contact angles, rolloff angle and absorption which can. These techniques may also have difficulty measuring dynamic changes in the contact angle. The baseline of the measurement is the horizontal line that represents the solid on which the droplet is being deposited. The contact angle is the angle formed between a drop of liquid and the surface of the lens.
Measure the contact angle of the drop in the image e. Nov, 2017 quick tutorial on using imagej to process contact angle data. The software is based on a plugin for imagej, a general purpose free imageprocessing package. Dynamic contact angles provide information about contact angle hysteresis, which originates from the properties that differ from the ideal surface.
How can i get a good contact angle value from the droplet. In fact people often perform contact angle measurements, by applying the sphere approximation, neglecting in this way the gravity effect, or by calculating the tangent of the profile without limit the drop volume. Contact angle is a simple and yet powerful tool for characterizing threephase junctions. Contact angle measuring surface tension the contact angle is a measure of the ability of a liquid to wet the surface of a solid. It is often necessary to adjust the viewing angle before measuring the contact angle. How to choose contact angle meter or contact angle. Static contact angle measurement involves the placement of microliter sized droplets on a sample surface. The system consists of a bespoke measurement software, usb microscope, motorized linear position slider and a sample holder with back lighting system. Mar 09, 20 contact angle measurement using imaging method. The optional software driven automated dispensing system is supported on all models. This software is designed to be as intuitive as possible, however we also provide guides on how to use it most effectively. Increased accuracy can be achieved using lowcost closeup lenses and the image can be transmitted to a laptop for sub sequent processing. The first one is done by expanding advancing contact angle and decreasing receding contact angle the drop size with the dispenser.
The portable contact angle meter is a handheld nondestructive portable contact angle meter for quantifying levels of surface preparation from the lab to the factory floor. The optical contact angle measuring and contour analysis systems of the oca series combine high resolution optics, exact liquid dosing and. The sca 20 module is the base software module that enables the measurement of contact angles. If the contact angle is less than 90 it is said that the liquid wets the surface, zero contact angle representing complete wetting. If a droplet is below 10 o, then a circle fit is used for contact angle measurements instead. There have also been several specialized advances customized for productionline environments 7. Contact angle measurement system contact angle measurement. Hoiadcam01 is a basic educational equipment for illustrating the basics of contact angle measurement to students. In addition, some of these techniques require expensive computer software to analyze the liquid interface and obtain a desirable accuracy of one percent in the measurement of contact angle. The authors prefer the freelyavailable imagej software package 10 for its everexpanding flexibility. Rugged and simpletouse the theta and theta lite contact angle meters offer highly repeatable qc and analytical tool for measuring the contact angle on a variety of substrates. Notice there is no way to calibrate contact angle data. Developments in opensource computer software and lowcost digital imaging devices are drivers for such a.
The common method of measuring the contact angle in capillary rise in porous media is by using the lucaswashburns equation which is derived from poiseulles law of liquid flow in capillary rise. Arnaudov ln1, cayre oj, cohen stuart ma, stoyanov sd, paunov vn. When an interface exists between a liquid and a solid, the angle between the surface of the liquid and the outline of the contact surface is described as the contact angle. Dataphysics oca optical contact angle measuring and. Advance drop shape is a common software platform for all our laboratory instruments and mobile solutions for analyzing the wetting of solid surfaces. Pdf procedure to measure the contact angle of a liquid drop using imagej with contact angle plugin. Contact angles can be divided into static and dynamic angles. The sessile drop contact angle is measured by a contact angle goniometer using an optical subsystem to capture the profile of a pure liquid on a solid substrate. Thetae pi acoshr, where thetae is the contact angle, h is the distance from the centre of the fitted circle to the baseline. How can i get a good contact angle value from the dropletsample. Ipic is one of the largest precision measurement tool manufacturer and importer in north america. The shape of the drop is controlled by the three forces of interfacial tension. What is the difference between static and dynamic contact angles.