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Theta

Attension Theta is an advanced and versatile contact angle meter for highly accurate measurements ofstatic and dynamic contact angle, 3D surface roughnesssurface free energysurface and interfacial tension, and interfacial rheology.

 Features & Benefits

  • Modularity and extensive accessories enable you to choose the level of automation and the advanced functionalities that you need for your particular application. Modularity also makes the system upgradable and secures long-term needs.
  • Unique innovative features and options, such as the possibility to combine contact angle measurement with 3D topographical measurements, and to get roughness corrected contact angles as a result. This makes it possible to understand the influence of surface roughness and chemical modification separately on wetting and adhesion properties.
  • OneAttension software for all measurement options—modern and user-friendly software that is based on over 20 years of experience and close co-operation with our customers. The software platform enables easy implementation of customized features and functionality for special demands.
  • Attension’s extensive service and application support team will help you get the best from your instrument. Pre-studies can be conducted in an AttensionLab to assess the feasibility of your research, test samples for verification, and demonstrate the suitability of Attension instruments to your research.

 

Product details

Theta is able to perform a complete range of automated measurements, which makes it a highly versatile instrument in research, industrial and QC laboratories. Measurements include: static contact angle with the sessile drop, captive bubble and meniscus methods, dynamic contact angle with the tilted drop and sessile drop methods, surface free energysurface/interfacial tension with the pendant drop and reverse pendant drop methods, 3D surface roughness with the Fringe projection phase shifting method, andinterfacial dilatational rheology with the pulsating drop method.

Theta enables you to choose the level of automation and the advanced functionalities that you need for your applications. It also a high degree of modularity and an extensive range of accessories that allow you to upgrade or change the instrument as your needs evolve.

Attension optical tensiometers use a monochromatic cold LED light source and a smooth lighting integration sphere to minimize sample evaporation. Image quality is guaranteed with a high-resolution digital camera and a high-speed data transfer between the computer and the instrument.

The system comes with OneAttension control software for analysis of drop shapes. It uses for example, the Young-Laplace equation as a reference method and can fit the entire drop profile. It complies with the promise of performance and simplicity:

  • Fully automatic measurements avoid user dependent variation and saves time.
  • Select ready-made experiment recipes or create custom programs for quick and repeatable operations.
  • Automatic base line detection and drop shape fitting
  • Contact angle on curved surfaces (circular or near-circular)
  • Flexible and programmable frame per second rate recorded by the camera

OneAttension is an all-inclusive software that enables 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 datapoint or groups of datapoints can be selected, transformed, plotted and analyzed. In-depth analysis takes seconds and data can be easily exported.

Here’s a comparison chart of the technical specifications of the Attension Theta contact angle meters product range.

 

 
 
Theta
Theta Lite
Theta QC

Available Measurements

Static contact angle
Dynamic contact angle
Automatic Manual
Surface/Interfacial tension
3D surface roughness
Interfacial rheology
Surface free energy
Zisman Plot, OWRK/Extended Fowkes, van Oss Acid-Base, Wu, Neumann’s Equation of State, Schultz 1 and 2

Available Measurement Methods

Sessile drop
Captive bubble
Pendant drop
Reverse pendant drop
Meniscus
Dynamic contact angle
Automatic Manual
Pulsating drop
3D Topography

Hardware

Measuring range (°, mN/m)
0…180, 0.01…1000 0…180, 0.01…1000 0…180, –
Accuracy (°, mN/m)
±0.1, ±0.01 ±0.1, ±0.01 ±0.1, –
Maximum sample size (mm)
Unlimited×95×180 (with stage) Unlimited×50×200 (with stage) Unlimited
Frame interval (s)
0.43·10-3…1000 0.006…1000
Maximum resolution (px)
782×582 744×480 752×480
Maximum measuring speed (fps)
2315 160
Camera
Gigabit Ethernet digital camera with zoom USB digital camera Digital camera
Light source
LED based background lighting LED based background lighting LED based background lighting
Field of view (Ø, mm)
1…16.9 7 5.35
Dimensions — Basic frame (L×W×H, cm)
74×20×59 49.5×13×31 12.5×11.9×15.2
Weight — Basic frame (kg)
7.3 5 1.3
Power supply (VAC)
100…240 100…240 100…240 (3.7)
Frequency (Hz)
50…60 50…60 50…60

Drop Profile Fitting Method

Young-Laplace (CA, ST/IT, M)*
Bashforth-Adams (ST/IT)*
Circular (CA)*
Polynomial (CA, M)*

Software

Provided software
OneAttension OneAttension Data transfer

System Requirements

Redommended system requirements
  • 2 GHz processor
  • 1 GB RAM1
  • 40 GB hard disk drive (20 GB free)
  • 1024×768 resolution
  • 1 USB-port2
  • 1 Gigabit Ethernet port (with Theta)

12 GB RAM recommended.
21 additional USB-port required with 3D topography module.

Operating system requirements
  • Windows 7 & 8 (32 or 64 bit)
  • Windows Vista (32 bit)
  • Windows XP SP3 (32 bit)

Optical tensiometers are used in a great variety of industries such as chemicalspharmaceuticals,electronicsfoodsenergypaper and packaging.

Theta harnesses the power of full automation to deliver unparalleled performance and ease of use for the most demanding research and industrial applications. It enables investigation of material properties such as: 

Application examples

Efficient separation of water from crude oil

Water-in-oil emulsions are formed in restrictions such as choke valves and pumps during oil production. This water must be separated out to attain adequate oil quality. Asphaltenes are soluble polyaromatics that naturally occur in crude oil and are a major emulsion stabilizer.

To study the role of asphaltenes at oil−water interfaces, measurements of interfacial rheology using the pulsating droplet technique at different frequencies, different concentrations with Theta and OneAttension software can be done. The importance of asphaltenes will increase in the future as a significant portion of the new oil reserves are heavy crudes with an asphaltenic nature (oil sands, heavy oils).

Wettability of functional surfaces and coatings

Nano-engineered functional surfaces are studied for a wide range of applications. For instance, super-hydrophobic self-cleaning coatings can be utilized in solar cells and windows. Contact angle is the method used to define the super-hydrohobicity and functionality of these novel surfaces.

For more detailed information about contact angle analyses on self-cleaning and super-hydrophobic surfaces, see:

Contact angle and 3D surface roughness to analyze implant biocompatibility

Various types of artificial materials are used as medical implants. The surface properties of the implant determine its interactions with the surrounding host tissue. Phys­icochemical properties of the surface, such as wettability and surface topography, are of prime importance for the optimization of adhesion, spreading and proliferation of cells. Contact angle and surface roughness measurements are therefore commonly utilized to evaluate biocompatibility of implants.

For more detailed examples of how Attension Theta contact angle and 3D Topography module roughness measurements have been used to evaluate biocompatibility, see: 

 

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