UK based Dyne Testing offer Sigma 700 and 701 force tensiometers that are a powerful and accurate technique to measure static surface and interfacial tension of liquids.
These direct measurements allow determination of a number of material and surface properties, such as dynamic contact angle, surface free energy, critical micelle concentration (CMC) and wettability.
This information can be used to determine adhesion, absorption, adsorption, cleanliness, surface heterogeneity, density, spreading, porosity, powder or sedimentation wettability, material solubility, biocompatibility and lubricity of solid surfaces, to name but a few.
Sigma force tensiometers are widely used in research, quality control and process control for the determination of:
· Interfacial tension
· Critical micelle concentration
· Powder wettability
· Dynamic contact angle
· Sedimentation
· Surface free energy
· Adhesion force
· Density
Density force tensiometry has become the method of choice for many industrial standards related to characterization of liquids. It is also the most widely used technique for measuring critical micelle concentration (CMC) of surfactants. In addition, it is the only method to determine the absorption and contact angle of a packed powder or of fibre beds using the Washburn method. The wetting of textiles and individual fibres can also be studied with Sigma force tensiometers.
When a liquid touches the surface of a solid, the liquid tends to be drawn up in a meniscus. The force exerted by the meniscus is measured and analyzed to determine surface tension. Using high surface free energy probes such as a platinum Du Noüy ring or Wilhelmy plate allow precise measurement of these forces. All Sigma force tensiometers measure surface and interfacial tension using plates or push and pull modes by ring. Correction calculations for rings are made using models from Huh and Mason (Harkins and Jordan, Zuidema & Waters and others also available).
- Fully automatic measurements avoids user dependant variation and saves time
- Select readymade experiment recipes or create custom programs for quick and repeatable operations
- Programmable probe and sample immersion and withdrawal cycle(s)
- Step by step powder protocol for simple powder wettability measurement
- Fully automatic CMC measurement
OneAttension is an all-inclusive software enabling immediate access to all measurement capabilities with no need to purchase and install separate software modules. It features an intuitive user interface, live analysis, configurable user groups and accounts and a preset liquid database. Any datapoints or groups of datapoints can be selected, transformed, plotted and analyzed. Data can easily be exported. In-depth analysis is now just a matter of seconds. Accessory modules for dispensers and temperature or pH control can be easily mounted into the measuring unit. In addition, special probes are available for density, wettability and tensiometry measurements as well as holders for fiber and plate studies. Two dispensers can be used simultaneously for critical micelle concentration (CMC) measurements, allowing a full CMC curve to be obtained in one measurement.
Sigma 700
The Sigma 700 has a wide weight range and microbalance maximum load of 210g, which makes it well suited for dynamic contact angle measurements of large and heavy solid and powder samples.
Sigma 701
Sigma 701 is also a multipurpose tensiometer but equipped with a different microbalance – 5g optimized for a different range of applications. Sigma 701 can measure in a much more narrow weight range but with improved sensitivity, optimized for fiber measurements.
Software modules for both models are independent and can be acquired separately, giving you the flexibility to customize the instrument to your needs. Modules are available for the following measurements: surface and interfacial tension, dynamic contact angle, CMC, density, powder wettability and sedimentation.
Sigma 700 | Sigma 701 | |
Available Measurements | ||
Surface tension | Yes | Yes |
Interfacial tension | Yes | Yes |
Critical micelle concentration | Automatic | Automatic |
Dynamic contact angle | Yes | Yes |
Surface free energy | Yes | Yes |
Powder wettability | Yes | Yes |
Density | Yes | Yes |
Technical Specifications | ||
Measuring range (mN/m) | 1 …2000 | 1 …1000 |
Displayed resolution (mN/m) | 0.001 | 0.001 |
Density range (g/cm³) | 0…2.2 | 0…2.2 |
Maximum load (g) | 210 | 5 |
Weighing resolution (mg) | 0.01 | 0.005 |
Contact angle range | 0 …180° | 0 …180° |
Contact angle resolution | 0.01° | 0.01° |
Calibration & locking | Automatic | Manual |
Sample state | Motorised | Motorised |
Temperature range (°C) | -20 … +200 | -20 … +200 |
Recommended system requirements
1GHz processor, 1GB MB RAM, 40 GB hard disk drive (20GB free), 1 USB port.
Accessories such as water bath and liquid dispenser may require a free RS-232 port.
Operating system requirements
Windows 7 & 8 (32 or 64 bit), Windows Vista (32 bit), Windows XP SP3 (32 bit).
Order Code | Description |
40-Sigma 700 | Sigma 700 Tensiometer, 240VAC, 50 Hz Including:
|
40-Sigma 701 | Sigma 701 Tensiometer, 240VAC, 50 Hz Including:
|
For accessory details please refer to the list below or contact our Sales Team for assistance.
Order Code | Description |
Environment and Sample Control: Temperature, pH, Stirrer & Cabinet | |
40-T705 | Thermostatic vessel (from -10 to +100ºC) |
40-T705A | Thermostatic vessel (from -10 to +200ºC) |
40-T115 | Gas phase temperature controller |
40-T708 | Temperature probe |
40-T102MC | Bath/circulator, Julabo F12-MA |
40-T102ME | Bath/circulator, Julabo F25-MA |
40-T102MT | Temperature probe for the Julabo bath circulator F25Me |
40-T102ED | Bath/circulator, Julabo F12-ED |
40-T140CAB | Cabinet |
40-T706 | Magnetic stirrer |
40-T118 | pH meter |
Critical Micelle Concentration | |
40-T101 | Liquid dispenser, Schott titronic universal 20ml |
40-T101A | Cable to connect two T101 dispensers |
Powder Wettability | |
40-T112 | Powder wettability measuring device, glass |
40-T112A | Powder wettability measuring device, steel Sigma 700 only |
40-T112B | Filter paper for T112A, 100 pcs/bag |
Density | |
40-T113 | Density measuring device |
Sedimentation | |
40-T119 | Sedimentation measuring device |
Probes and Calibration | |
40-T106 | Platinum Du Nouy ring |
40-T106A | Certificate for Du Nouy ring dimensions |
40-T106B | MIKES calibration certificate for Du Nouy ring |
40-T107 | Wilhelmy Plate, platinum plate with micro roughened surface |
40-T107A | Certificate for Wilhelmy plate dimensions |
40-T107C | MIKES calibration certificate for Wilhelmy plate |
40-T110 | Platinum rod |
40-T117B | Certified calibration kit |
40-T120 | Calibration weight |
40-T108 | Ring re-form tool |
Sample Holders | |
40-T109RF | Sample holder for plates |
40-T111 | Sample holders for fibres |
Vessels | |
40-T104 | Sample vessel, diameter 70mm, 5 pcs/box |
40-T105 | Sample vessel, diameter 50mm, 5 pcs/box |
Computer | |
40-T130 | Computer with pre-installed OneAttension Software |
Maintenance & Services | |
40-STUP-EU | Start up & training |
40-1A-UG | OneAttension upgrade |
40-SERV1 | Service contract level 1 |
40-SERV2 | Service contract level 2 |
40-SERV3 | Extended warranty |
For a detailed list of accessories please refer to the attachment