DH-Q Series Interfacial Tension Meter, Touch Screen Basic Parameter liquid Solubility Determination Machine

DH-Q Series Interfacial Tension Meter

High-end Solution For Measuring Surface/Interfacial Tension

Surfactant CMC Measurement

      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.

Wilhelmy Plate method

      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.

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.

      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

High-quality core components ensure accurate measurement. Each machine is equipped with a high-precision mechanical electromagnetic force sensor, and the highest precision of surface tension can reach 0.001 mN/m.

Using a 7-inch touch screen, all information is clearly displayed on the screen and operations are completed. The machine can be used without a computer during operation, and supports Chinese and English interchangeable display.

Tensiometer meets plate method/ring method measurement, direct reading of data does not require calculation, and plate/ring design size and process meet domestic/foreign standards.

According to the principle of buoyancy, the tensiometer immerses the object of standard volume in the test sample and calculates the liquid density value.

Illumination in the spacious measuring area, which illuminates the sample surface as well as the measuring body, makes positioning the sample extremely easy.

Rich optional accessories

A variety of accessories are available to meet many needs beyond routine testing.

Flexible and versatile surface/interfacial tension measurement methods

★Q series tensiometer provides many expansion modules to expand the application scope of the instrument, which is used to measure various characteristics of surfaces and interfaces, which greatly improves the flexibility of its use. The main measurement principle is to accurately obtain the force between the measurement accessory or the sample to be measured when it is wetted by liquid. The instrument uses standard methods including the DuNoüy ring method and the Wilhelmy plate method. to measure the surface and interfacial tension of liquids. In addition, the instrument can be used to accurately measure the density of liquids with the necessary optional accessories.

★The spacious sample room is equipped with a transparent glass sliding door, which can protect the room from disturbed airflow. A built-in electronic level aids in precise adjustment of the sample stage for precise force measurement.

★The built-in measurement program can control the sample stage to ensure that there is no human interference in the measurement process. The running speed can be adjusted according to the experimental requirements and can be accurately repeated. The use of a dynamic, smooth-running drive eliminates negative vibrations. In addition, the long-term drift of the mechanical sensor is minimized.

★Through the 7-inch touch screen, simple and intuitive operation is realized. Intuitive operation on the touch screen is a feature of the new generation of tensiometers, allowing easy control of the sample stage and other components before and during a measurement.

★Built-in measurement data management menu, easy to view data and support external printer operation. All measurement data files can be transferred through a USB flash drive to convert to Excel files for easy management, recording and organization of measurement data.

★The machine program has a password management function to ensure that the data can be traced and prevent data modification and accidental deletion.

Application field

    ▇Evaluation of surfactant effectiveness and efficiency by measuring critical micelle concentration

▇Wetting properties of tablets, active pharmaceutical ingredients and excipients

▇Wetting of paints and coatings

▇Oil aging degree detection

▇Coating Wetting and Adhesion

▇Cosmetics Development

▇Study on Wetting Characteristics of Ink

Transparent measurement and data management software ST Flash

      The simple operation of the Q-Series Tensiometers is tightly coupled with the software's clear user guidance. Our ST Flash software supports simple results management with automatic summary charts, comprehensive measurement reports and transparent data organization, as well as CMC analysis and calculations.

▇ Support data collection, and label the data for easy viewing and comparison.

▇ The collected data is saved in the form of a TXT file, which is convenient for viewing and conversion, and a graphic document is generated in the form of PDF when printing.

▇ Supports simultaneous comparison of up to 8 sets of data.

▇ ST Flash software provides a toolkit for analyzing CMC concentration.

▇ The software supports Chinese and English operation and display.

We attach great importance to the repeatability and standardization of measurement results, and the Q series tensiometers are designed to comply with all GB/T, EU, ISO, DIN and ASTM standards for surface and interfacial tension.

Satisfies partially valid norms and standards

ASTM D971 Standard Test Method for Oil-Water Interfacial Tension Using the Lifting Ring Method

ASTM D1331 Standard Test Method for Surface and Interfacial Tension of Surfactant Solutions

ASTM D1417 Standard Method for Testing Synthetic Rubber Latex

DIN EN 14210 Surfactants - Determination of the interfacial tension of surfactant solutions by the stirrup or ring method

DIN EN 14370 Surfactants - Determination of surface tension

ISO 6889 Surfactants - Determination of surface tension by the pull-film method

ISO 304 Surfactants - Determination of Surface Tension by the Pull-Film Method

ISO 1409 Plastics/rubber - Polymer dispersions and rubber latexes (natural and synthetic) - Determination of surface tension by the ring method

Ring size: wire radius is 0.185mm, ring radius is 9.55mm, ring circumference is 60mm,

N/A: means that this function is not included.

*Note: The board/ring test method needs to be specified when ordering. Choose one of the two standard configurations. If the budget is sufficient, it is recommended to configure both the board and the ring.

**Note: The standard configuration of the printer is not included, it can be purchased separately according to the needs, and the standard volume parts must be purchased separately for measuring the liquid density.