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ASTM D971 DIN EN 14210 Automatic Surface Tension Meter surface tension measurement machine with platinum ring method
1.Test Standards
ASTM D971 -- Standard Test method for Determination of interfacial tension between oil and water by the Lifting Ring Method
ASTM D1331-- Standard Test method for Surface and Interfacial tension in surfactant Solutions
ASTM D1417 -- Standard Method for Testing synthetic rubber latex
DIN EN 14210-- Surfactants -- Determination of interfacial tension of surfactant solutions by stirrup or suspension ring method
DIN EN 14370 -- Surfactants -- Determination of surface tension
ISO 304-- Surfactants -- Determination of surface tension by the pull film method
ISO 1409 -- Plastics/rubber -- Polymer dispersions and rubber latex (natural and synthetic) -- Determination of surface tension by the ring method
OECD 115-- OECD guide for testing chemicals: Surface tension in aqueous solutions
ISO 6889 -- Surfactant -- Determination of surface tension by the pull film method
ASTM D971 DIN EN 14210 Automatic Surface Tension Meter surface tension measurement machine with platinum ring method
2.Introduction
Physical science defines surface tension as shrinking and minimizing the surface area of a liquid. If the surface is enlarged by the formation of a liquid sheet, it means that the surface/interfacial tension is exerted by a measurable tensile force when the test body (such as a Wilhelmy plate or a Du Nouy ring) is in contact with the liquid. Inside the machine, this force is measured by a high-precision load cell system, so the surface/interfacial tension of the liquid can be calculated.
Using a tensiometer, it is also possible to measure the interfacial tension between two liquids when the test bodies are not melted. Because tensimetry is based on force measurements, in contrast to optical analysis of pendant droplets, there is no requirement that one of the liquids be transparent or that the refractive index differs between the two liquids. Therefore, tensimetry is a convenient alternative to optical measurements of surface and interfacial tension in many cases.
ASTM D971 DIN EN 14210 Automatic Surface Tension Meter surface tension measurement machine with platinum ring method
3.Application field
★ The effectiveness and efficiency of surfactants were evaluated by measuring critical micelle concentration
★ Wettability of tablets, pharmaceutical active ingredients and excipients
★ Wettability of paint and coatings
Oil aging degree detection
★ Coating wettability and adhesion
★ Cosmetic development
★ Study on ink wetting characteristics
ASTM D971 DIN EN 14210 Automatic Surface Tension Meter surface tension measurement machine with platinum ring method
4.Surfactant CMC Measurement
Surface-active compounds such as surfactants consist of a hydrophilic part and a hydrophobic part, so they preferably adsorb at the interface. They reduce the surface or interfacial tension, respectively, which is crucial for good washing performance or foam stability.There is a limit to the number of surfactant molecules that can be accommodated on a given surface area. The only possibility for "excess" surfactant molecules to protect their hydrophobic moieties from water is to form micelles. The specific surfactant concentration reached to initiate micelle formation is called the "critical micelle concentration" (CMC). This can be easily determined by varying the measurement of surfactant concentration: below the CMC, the surface tension decreases with increasing concentration as more and more surfactant molecules are adsorbed on the surface. Above the CMC basis, further added surfactants are only used to form micelles and the surface tension remains constant.
ASTM D971 DIN EN 14210 Automatic Surface Tension Meter surface tension measurement machine with platinum ring method
5.Wetting phenomenon
Using tensimetry, the wettability and dynamic contact angle of solid samples used as test bodies can also be investigated. Therefore, the sample is immersed in a liquid with known surface tension and pulled out again. In this case, the weighing system detects the buoyancy and sheet weight in real time. During evaluation, buoyancy effects can be removed from the data so that the advancing angle of immersion and the receding angle of withdrawal can be determined according to the Wilhelmy equation.
ASTM D971 DIN EN 14210 Automatic Surface Tension Meter surface tension measurement machine with platinum ring method
6.Wilhelmy Plate method
The Wilhelmy plate method is a well-established method for determining surface and interfacial tension using tensiometers. This method uses a Wilhelmy plate as a test body. It is usually made of platinum iridium and is only a few centimeters in length and height. The plate is connected to the weighing system of the tensiometer and is positioned on the surface of the liquid in such a way as to form a sheet of the liquid. The force on the sheet is measured, which is equal to the vertical part of the tension caused by the surface tension. Together with defining surface tension as the tension on each side of the contact line length, this yields the Wilhelmy equation.
All Design Features Are Developed For Your Exact Needs
ASTM D971 DIN EN 14210 Automatic Surface Tension Meter surface tension measurement machine with platinum ring method
7.Product Feature
1.High quality core components ensure accurate measurement, each tensimeter is equipped with a high-precision mechanical electromagnetic force sensor, the highest precision of surface tension up to 0.001 mN/m.
2.Tensimeter adopts 7 inch touch screen, all information is clearly displayed on the screen and the operation is completed.The machine does not need a computer when operating, can be used, support Chinese and English exchange display.
3.A tractor serves several purposes.
The tensimeter can meet the plate/ring method measurement, data direct reading does not need to calculate, plate/ring design size and process meet domestic/foreign standards.
4.Liquid density measurement
According to the buoyancy principle, the density of the tested sample can be accurately obtained by immerging the standard volume part in the test sample.
5.Measurement space with LED lighting
The lighting device in the spacious measurement area can illuminate the sample surface and the measuring body, so that the sample positioning is more accurate.
6.A wealth of optional accessories
Provide a variety of accessories to meet often different test needs.
ASTM D971 DIN EN 14210 Automatic Surface Tension Meter surface tension measurement machine with platinum ring method
8.Measurement methods
★ Q series tensiometers provide a variety of measurement methods, including the traditional platinum plate method (Wilhelmy) and platinum ring method (DuNouy), as well as optional density accessories to accurately measure the density of the sample under test.
★ Platinum ring method can be set one stretch or multiple stretches, can be set by yourself.No calculation, automatic measurement.
Built-in electronic level, with operating instructions.It can accurately adjust the level of the sample table to ensure the accurate measurement of the tensimeter.
★ The spacious sample room is equipped with transparent glass sliding door, which is very convenient to operate and can prevent the influence of indoor air flow on stability measurement.
★ The built-in measuring program can control the lifting of the sample platform to ensure no human interference in the measuring process. The running speed can be adjusted according to the requirements of the experiment and can be repeated accurately.The use of dynamic and fluid actuation eliminates vibrations that can have negative effects.
★ Electromagnetic force sensor and matching control system, temperature compensation function, can reduce long-term drift to a minimum.
★ Simple and intuitive operation through 7-inch touch screen.Intuitive operation on the touch screen is a major feature of the new generation of tensimeter, no matter before or during the measurement, can easily control the sample table and other components.
Built-in measurement data management menu, easy to view data and support external printer operation.All measurement data files can be transferred through THE U disk and converted into Excel files for convenient management, recording and sorting of measurement data.
ASTM D971 DIN EN 14210 Automatic Surface Tension Meter surface tension measurement machine with platinum ring method
9.Measurement and data management software ST Flash
Q series tensimeter software has clear user guidance, operation is very convenient.Our ST Flash software supports simple data management, CMC analysis and calculation through easy-to-understand charts, comprehensive measurement reports and data organization functions.
★ Support data collection, and can annotate the data, easy to view comparison.
★ The collected data is saved in the form of TXT document for easy viewing and conversion, and printed in THE form of PDF to generate graphic documents.
★ A maximum of eight groups of data can be compared simultaneously.
★ The ST Flash software provides the TOOL package for analyzing CMC concentration.
★ Software support Chinese and English operation and display
ASTM D971 DIN EN 14210 Automatic Surface Tension Meter surface tension measurement machine with platinum ring method
10.Detailed technical parameters
| Model | Q2000 | Q1000 | Q500 |
| Test method* | Platinum plate method, platinum ring method | ||
| Surface tension test range | 0-2000mN/m | 0-1000mN/m | 0-500mN/m |
| Accuracy of surface tension | 0.1mN/m | 0.01mN/m | 0.001mN/m |
| Liquid density range | 0-3.000g/cm3 | N/A | |
| Density accuracy | 0.001g/cm3 | N/A | |
| Operating mode | Automatic lifting and automatic measurement of sample table | ||
| Lifting speed | 0-300mm/min can be adjusted arbitrarily | ||
| Display mode | 7 inch touch screen data direct reading | ||
| Data mode | Supports data storage, viewing, and printing | ||
| Measuring time | Routine within 60 seconds | ||
| Data output | RS232(printer) or USB | ||
| Data software |
ST Flash software is standard | ||
| Dimension | 47*24.5*47.5 cm Length * width * height | ||
| Net weight | 18kg | ||
| Power supply | 110V or220V,50W | ||
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