Tensiometry

M. Sc. Natalie Bonakdar (Krüss, DSA 100S/Krüss, DSA25E)

M. Sc. David Panduro (DataPhysics Instruments, OCA 200)

M. Sc. Lukas Römling, Manuela Hollmach (DataPhysics Instruments, SVT 25)

Contact Angle Measuring Device | Krüss, DSA 100S

The Drop Shape Analyzer DSA100S is used to analyze the wetting and coating properties of solids and liquids. The instrument measures contact angle and surface tension. The instrument features very fast liquid needle dosing technology which allows contact angle measurements even on moving samples.

• Sample: solid or liquid
• Maximum sample size: 320 mm × ∞ × 275 mm (W × D × H (without axes))
• Temperature control: -50 to 400 °C, ±0.1 °C
• Methods:
  o Sessile drop/captive bubble
  – Result: contact angle
  – Range: 0 to 180°(software based)
  – Resolution: 0.01°(software based)
  – Accuracy: 0.1° (device based)
  – Models: cationic section, polynomial, circle, Young-Laplace, height-width
  – Type: advancing, receding, static, dynamic, tilting
  o Hanging Drop (Pendant Drop/Rising Drop)
  – Result: surface tension, interfacial tension
  – Range: 0.01 to 2000 mN/m (software based)
  – Resolution: 0.01 mN/m (software based)
  – Model: Young-Laplace
  – Type: static, dynamic
  o Surface Free Energy of Solids
  – Results: surface free energy, polar and disperse part, acid and base part, H-bond part
  – Model: equation of state, Zisman, Fowkes, Wu, Owens-Wendt-Rabel-Kaelble, Schultz-1, extended Fowkes, acid-base theory
• Dosing system: software controlled
  o Multi-dosing system: up to 8 liquids (software controlled)
  o Syringes, volume: glass (1 x 450 µL), disposable (900 µL)
  o Resolution (syringe dosing): 0.1 µL
  o Speed (tip dosing): 0.02 to 25 µL/s

Contact Angle Measuring Device | Krüss, DSA25E

The Drop Shape Analyzer DSA25E measures contact angles and surface tensions for the analysis of wetting and coating properties of liquids and solids.

• Sample: solid or liquid
• Maximum sample size: 320 mm × ∞ × 165 mm (W × D × H (without axes))
• Temperature control: -50 to 400°C, ±0.1°C
• Methods:
  o Sessile Drop/Captive Bubble
  – Result: contact angle
  – Range: 0 to 180° (software based)
  – Resolution: 0.01° (software based)
  – Accuracy: 0.1° (instrument based)
  – Models: cationic section, polynomial, circle, Young-Laplace, height-width
  – Type: advancing, receding, static, dynamic, tilting
  o Hanging Drop (Pendant Drop/Rising Drop)
  – Result: surface tension, interfacial tension
  – Range: 0.01 to 2000 mN/m (software based)
  – Resolution: 0.01 mN/m (software based)
  – Model: Young-Laplace
  – Type: static, dynamic
  o Surface Free Energy of Solids
  – Results: surface free energy, polar and disperse part, acid and base part, H-bond part
  – Model: equation of state, Zisman, Fowkes, Wu, Owens-Wendt-Rabel-Kaelble, Schultz-1, extended Fowkes, acid-base theory
• Dosing system: software controlled
  o Droplet settling (syringe dosing): manual
  o Syringes, volume: glass (2 x 450 µL), disposable (900 µL)
  o Resolution (syringe dosing) 0.1 µL
  o Speed (tip dosing): 0.02 to 25 µL/s

Contact Angle Measuring Device | DataPhysics Instruments, OCA 200

The OCA 200 is a contact angle measuring instrument and drop shape analyzer for the characterization of microscopic and macroscopic structures. The OCA 200’s electrically operated, software controlled optical adjustment allows the angle of observation to be changed and automatic focusing to be performed. With its groundbreaking 10x zoom lens and DataPhysics Instruments’ proven autofocus system, the OCA 200 is suitable for all sample sizes, from macroscopic to microscopic samples. Its electrically driven stage allows microstructured samples to be positioned with high accuracy and exceptional speed. The instrument also features a DDE/X electronic direct dosing system with up to four ESr-N electronic syringe modules, which can be used to deposit liquids on macroscopic samples and analyze their surface parameters. For the analysis of microstructured samples, on the other hand, the nanoliter dosing system is used, which generates small drops of up to 10 nanoliters. For even smaller structures, the picoliter dosing system PDDS is used, which generates droplets as small as 30 picoliters.

• Contact angle:
  o Measuring range: 0 to 180°
  o Accuracy: ± 0.1°
  o Resolution: ± 0.01°
• Surface and Interfacial Tension:
  o Measuring range: 0.01 to 2000 mN/m
  o Resolution: ± 0.01 mN/m

Interfacial Tension Measuring Device | DataPhysics Instruments, SVT 25

The Spinning Drop Video Tensiometer is a compact optical instrument for the measurement of low to ultra-low interfacial tensions and the investigation of interfacial rheological properties. Highest accuracy and reproducibility of measurement results are guaranteed by proven measurement technology and high quality mechanical and optical components. State-of-the-art electronics allow intuitive operation of the SVT 25 with the TP 50 control unit. The measuring cell with rotating capillary is mounted on a tilting table for fast measurements, allowing easy positioning of the drop in the image. The powerful 6.5x zoom lens with fine focusing enables analysis of both small and large drops. The high performance camera allows analysis with exceptional resolution, fast processes can be captured at up to 3250 frames per second (fps). Once captured, the drop is automatically tracked by the moving camera.

• Measurement of low to ultra-low interfacial tensions from the contour of rotating drops according to the Vonnegut, Cayias-Schechter-Wade or Young-Laplace model
• Highly dynamic measurement drive from 0 to 20000 rpm
• Oscillation measurements with oscillation periods from 0.5 s to ∞ and a maximum acceleration of 500 revolutions/s²
• Motorized stage
• Powerful 6.5x zoom lens with integrated continuous fine focus
• Motorized optics for automatic tracking of moving droplets
• High-performance camera with USB 3 interface, 2/3″ sensor, max. 2048 x 1088 pixels, max. 3250 frames per second (fps)
• Precise, fast and easy capillary exchange system
• LED illumination with stroboscope function and adjustable slit aperture
• Temperature controlled cells for temperatures from -30°C to 180°C
• Special capillary for water-based samples at temperatures up to 130 °C
• Automatic calibration function to correct optical distortion caused by the cylindrical lens effect of the capillary
• TP 50 control unit with touch screen and precision wheel

https://www.kruss-scientific.com/de-DE/produkte-services/produkte/dsa100s

https://www.kruss-scientific.com/de-DE/produkte-services/produkte/dsa25e

https://www.dataphysics-instruments.com/de/produkte/oca/

https://www.dataphysics-instruments.com/de/produkte/svt/

Further information to follow