- Critical Micelle Concentration
Du Noüy ring and Wilhelmy plate methods - Surface tension
Du Noüy ring and Wilhelmy plate methods - Interfacial tension
Du Noüy ring and Wilhelmy plate methods - Dynamic contact angle
Wilhelmy methods - Surface free energy
Based on contact angle measurements - Powder wettability
Washburn method - Density
Density probe - Sedimentation
Sedimentation probe - Adhesion force
Liquid droplet pull-off method
What you can measure
Widen you view
In this 1-minute video, you will get a quick view of Sigma CMC. For the best experience, watch it in fullscreen mode!
3 reasons to invest
Full CMC automation for high precision
Everything from measuring surface tension and changing surfactant solution concentration to analyzing the shape of the CMC curve automatically ensures a user-independent and unattended operation. Integrated magnetic stirrer ensures surfactant solution homogeneity.
Sophisticated software
The OneAttension software provides full versatility and automation, easy measurement setup, and live results. But above all, it is really user-friendly and intuitive. Includes features like autosearch to reduce CMC measurement time by automatically increasing the number of data points only around the CMC point.
Optimized yet versatile
Sigma CMC is an adaptable and versatile system that not only measures CMC but also has the full support of other surface measurement modes from surface tension to powder wettability. This ensures the system is future-proof for any measurement needs that may come to you.
A closer look
Sigma CMC is based on the versatile Sigma 701 that is known for its particularly high sensitivity. It can also be used with the Sigma 700 which is optimized for powder wettability and contact angle measurements. Check out the system specifications below.
Sigma 700 |
Sigma 701 |
|
Available Measurements |
||
Surface tension |
√ | √ |
Interfacial tension |
√ | √ |
Critical Micelle Concentration |
Automatic | Automatic |
Dynamic contact angle |
√ | √ |
Surface free energy |
√ | √ |
Powder wettability |
√ | √ |
Density |
√ | √ |
Sedimentation |
√ | √ |
Balance Specifications |
||
Measuring range (mN/m) |
1…2000 | 1…2000 |
Displayed resolution (mN/m) |
0.001 | 0.001 |
Density range (g/cm3) |
0…2.2 | 0…2.2 |
Density resolution (g/cm3) |
0.0001 | 0.0001 |
Maximum load (g) |
210 | 5 |
Weighing resolution (mg) |
0.01 | 0.005 |
Force resolution (µN) |
0.1 | 0.05 |
Contact angle range (°) |
0…180 | 0…180 |
Contact angle resolution (°) |
0.01 | 0.01 |
Calibration & Locking |
Automatic | Manual |
Measuring Unit Specifications |
||
Sample stage |
Motorized | Motorized |
Sample stage speed (mm/min) |
0.01…500 | 0.01…500 |
Stage positioning resolution (µm) |
0.016 | 0.016 |
Dimensions (L×W×H, cm) |
33.3×24.4×62 | 33.3×24.4×62 |
Weight (kg) |
16.3 | 13 |
Power supply (VAC) |
85…264 | 85…264 |
Power consumption (W) |
13 | 13 |
Frequency (Hz) |
47…440 | 47…440 |
Common Accessories |
||
Temperature control range (° C) |
-20…+200 | -20…+200 |
Stirrer |
√ | √ |
Software |
||
Provided software |
OneAttension | OneAttension |
System Requirements |
||
Recommended system requirements |
|
|
Operating system requirements |
|
OneAttension Software
OneAttension software is a fine combination of a very intuitive interface and high functionality. Follow your experiment live and get the results within seconds. Let's have a look at the features!
OneAttension Features
- Full automation
OneAttension supports fully automated measurements - get CMC values with a click of a button - Live analysis
The results are shown in real-time during the measurement. You can conveniently monitor your results as they are forming - Best in class interface
The software is easy to learn, and the logical interface allows even complex measurements to be performed with ease - Flexibility for every need
OneAttension has been designed to meet the requirements of almost any applications you may have. You can easily adjust measurement parameters to match your specific application needs - Data handling and exporting made simple
Data analysis, plotting, and statistical analysis can all be done with a few clicks to give you accurate results within seconds. All data can easily be exported further to Excel, for example - Optimal for industrial use
Measurement reports can be created with a few clicks and the user manager conveniently handles all different users – with desired privacy levels. Autosearch function saves measurement time
Add more possibilities
Have a look at a few of the accessories that can be used for added capabilities. You can find the full range below in the accessory brochure.

Platinum Du Nouy ring
Pt-Ir-ring made to fulfill the requirements at least in following standards; ISO 301, ISO 4311, ISO 6889, ASTM D1331 and ASTM D 971. Includes also additional weight for push-mode.

Platinum Wilhelmy plate
Platinum Wilhelmy plate with micro roughened surface.

Thermostatic vessel (from -20 to +200°C)
For temperature control of the sample liquid. A heat exchange vessel with fluid jacket type of construction.

Temperature probe
PT-100 temperature measurement probe with holder. The temperature is shown in OneAttension software.
What others say
Our instruments are present at many prestigious universities and research facilities world wide. Take a minute to find out what others say about Sigma instruments.
Researcher at Riken
"We wanted the most accurate force tensiometer on the market for our research on surface tension. Our in-depth testing of the Attension force tensiometer convinced us: it is the one."

Riken, Japan
Riken is a Japanese research institute established in 1917. Its research areas include physics, chemistry, biology, medical science, engineering and computational science.
Learn more
We have gathered all our in-depth knowledge associated with Sigma 700/701. Browse around amongst webinars, overviews and white papers to find a topic of interest.
- Attension

The Importance of Contact Angle in Industry
- Attension

Surface and Interfacial Tension
- Attension

Surface Free Energy Methods
- Attension

The Importance of Surface Tension in Industry
- Attension

Contact Angle - What is it and how do you measure it?
- Attension

Surface Free Energy - What is it and how to measure it?
- Attension

Surface Free Energy in Practice
- Attension

Surface and Interfacial Tension
- Attension

Surface Tension and Surfactants in Industrial Processes
- Attension

Using Contact Angle Measurements in Surface Research and Quality Control
- Attension

Wettability Measurements in Biomedical Applications
- Attension

Critical Micelle Concentration - What is it and how to measure it?
- Attension

Powder Wettability
- Attension

Powder Wettability - How to Measure Contact Angle of Powders
- Attension

Sigma 700 / 701 online demo
- Attension
