• K100 with Peltier temperature control unit TJ50

    K100 with Peltier temperature control unit TJ50

  • K100 with Micro Dispensers

    K100 with Micro Dispensers

  • Force Tensiometer – K100

    Force Tensiometer – K100

  • Sample chamber of K100

    Sample chamber of K100

Force Tensiometer – K100

The universal instrument for analyzing surfactants and solid surfaces

Our universal Force Tensiometer – K100 performs high-precision, automatic and reliable measurements of surface tension and interfacial tension, critical micelle concentration CMC and contact angle on solids, fibers and powders. With high-quality components and a uniquely wide range of methods, the instrument carries out many tasks in the field of surfactant analysis and wetting measurement for your quality assurance or research. The simple changeover between different measuring methods takes place entirely without reconfiguring the instrument.

High-quality components for precise measurements

The principal measuring methods used by the K100 are based on the precise measurement of the force which occurs when wetting a measuring probe or a solid sample. We use a special force sensor with a particularly high resolution for the instrument in order to obtain reliable, accurate measurements, for example for determining surface and interfacial tension or contact angle. To ensure accurate measuring results, we use measuring probes such as rings and plates with highly accurate contours. This guarantees an exact correlation between measured force and the surface or interfacial tension.

The software-controllable sample stage moves in a wide speed range and communicates its exact position to the software with a resolution of 0.1 μm. This adds to the accuracy of results where position control is essential, e.g. for Du Noüy ring or contact angle measurements. The option of saving standard positions supports you in preparing the analyses.

An integral, automatic stirring function ensures optimum homogenization of dispersions before measuring or rapid equalization of concentration or temperature.

The ionizer inside the sample chamber ensures reliable contact angle measurements on solid samples and single fibers. The ionizer automatically removes the troublesome effect of static charge before the measurement is carried out. Otherwise, this could falsify the result in the form of an additional force.

As an addition to software control, the easy-to-use keypad for controlling the sample stage and other components such as the illumination or the stirrer, saves even more time. Thanks to the large sample chamber, the sample is loaded quickly, conveniently and safely into the instrument. Magnetically locking glass swing doors shield the sample chamber from troublesome air currents.

Video | Universal analysis of liquid and solid surfaces

Video | Universal analysis of liquid and solid surfaces | K100

Many accessories expand the range of options

With different available temperature control units, measurements can be carried out between -15 and 300 °C: This  enables thermal process conditions to be simulated and even samples such as polymer melts or bitumen to be analyzed.

Our Micro Dispenser equips the Force Tensiometer – K100 for measuring the critical micelle concentration (CMC). The surfactant concentration range is set up and measured fully automatically. Working with two micro dispensers – one for dispensing the liquid and the other one to aspirate the same volume – enables a very wide concentration range. A high density of measuring points can be created in order to measure the CMC very accurately. Failed measurements due to an overly concentrated parent solution are virtually ruled out, as it can be diluted by several orders of magnitude to find the CMC.

We have also developed accurately shaped sample holders for exactly reproducible measurements with different types of sample for measuring the contact angle on powders and fiber bundles using the Washburn method. The density of liquids can also be accurately measured with a special solid measuring probe. This method is particularly useful when the density is required as an input parameter for other methods, for example when measuring surface tension using the ring method.

Other measuring probes and measuring options help you with the extensive characterization of solids or dispersions. These include measuring the density of solid substances, the sedimentation speed of dispersions and the penetration resistance of a sediment.

The K100, in the basic version K100C, is available with a slightly lower resolution force sensor and without the ionizer. The K100C is ideally suited to ensuring the quality of surfactant solutions by measuring the surface and interfacial tension.

Impressive instrument control and data management with our ADVANCE software

ADVANCE is our universal software designed to work with all KRÜSS instruments based on a common, intuitive approach. The relevant functions for each working step are arranged in tiles which display all elements necessary in the context. By avoiding the use of menus and pop-ups, ADVANCE saves any unnecessary clicks and time-consuming searches for hidden elements.

The K100 measuring methods run with pre-prepared templates that standardize the fully automated procedures down to the smallest detail, thus providing maximum repeatability. All raw data and results are clearly shown in several tiles that are custom-made for each method. Functions for comprehensive reports and data export as well as a fast access to result comparisons of up to 20 measurements make ADVANCE a powerful tool for managing and evaluating your data.

Tasks and applications

  • Determination of the effectiveness and efficiency of surfactants by CMC measurement
  • Wetting behavior of tablets, pharmaceutical active ingredients and excipients
  • Wetting of varnishes and paints
  • Decomposition product content in oils
  • Tank clearance and cleaning validation in the foodstuffs industry
  • Wetting and adhesion of coatings
  • Development of cosmetic products
  • Wetting properties of inks
  • Wetting of fiber bundles and textiles
  • Sedimentation and ductility of dispersions
  • Checking of surface modifications

Measuring methods and options

  • Surface tension and interfacial tension using the ring, plate and rod method
  • Surface tension and interfacial tension using the ring tear-off method, for example for measurements in accordance with ASTM D‑971
  • Critical micelle concentration (CMC) of surfactants
  • Contact angle and surface free energy of solids, powders or fiber bundles
  • Density of liquids and solids
  • Sedimentation behavior of dispersions
  • Penetration resistance of sediments
  • Measurement from -15 to 300 °C, temperature measurement with internal or external sensor

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Press release

Precise dosing for fully automatic
CMC measurements