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OCA 20
Video-Based Contact Angle Meter
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Description:
Measuring device for the software-controlled measurement and
analysis of the static and dynamic contact angle, the surface
free energy of solids and their components and the surface and
interfacial tension based on the analysis of the drop shape.
Typical fields
of application:
For the software-controlled measurement and analysis of
- the static
and dynamic contact angle according to the Sessile and
Captive Drop method
- the analysis
of the drop shape according to the Pendant Drop method
- the wetting
behavior on solid surfaces
- the surface
free energy of solids and their components
- the surface
and interfacial tension out of the analysis of the drop
shape
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Equipment:
The OCA 20 consists of
the basic instrument with the following technical equipment:
- Dosing bay for
installation of the optional manual syringe units and single or
multiple (max. 4, optional 6) needle support with a vertical and
horizontal fine adjustment
- Measuring stage
adjustable in X-, Y- and Z- axis for accurate sample positioning
- Lens mount with
adjustable tilt
- High-performance
six-fold power zoom lens with an integrated continuous fine focus
- High-speed video
system with adapter and CCD-camera
- High-performance
video digitizing board (frame grabber) for the PC
- Halogen lighting with
continuously adjustable intensity without hysteresis for a
homogeneous back lighting
- Control and measuring
electronics with built-in digital temperature display and serial RS
232C interface
- Power supply with
automatic voltage adjustment
Features of
performance:
The 32 bit software SCA
20 developed for Windows NT/9x/2000 offers by various expansion steps:
- Control of the
electronic syringe modules, the tilting base assemblies, wafer
stages and temperature control units
- Static and dynamic
contact angle measurement according to the Sessile and Captive Drop
method
- Calculation of the
surface and interfacial tension from the contours of pendant and
sessile drops as well as of liquid lamellas on plates, rods and
threads
- Calculation of the
surface free energy of solids and their components (e.g. dispersion,
polar and hydrogen bond force contribution, acid and base portions
respectively) according to the theories of Wu, Zisman, Owens-Wendt,
Extended Fowkes, Schultz 1 + 2, Fowkes, van Oss & Good
(Acid-Base), Equation of States (EOS)
- Calculation of
wetting envelopes from the surface free energy
- Statistics and
measurement error analysis
Technical Data:
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Maximum
sample size (L x W x H) |
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220 x ∞
x 70 mm, 8"-Wafer on WT 200 M/E |
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Size of
sample stage |
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100 x
100 mm |
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Range
of contact angle measurement |
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0 …
180° ; ± 0.1° measuring accuracy of the video system |
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Range
of surface and interfacial tension |
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1·10-²
… 2·10³ mN/m; resolution: min. ± 0.05 mN/m |
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Optics |
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Six-fold
zoom lens (0.7 … 4.5-fold magnification) with integrated fine
focus (±6 mm) and high light transmitting capacity.
CCD-camera with a resolution of max 768 x 576 pixels
Field of view (FOV): 1.75 x 1.4 … 11.7 x 9 mm
Optical distortion: < 0.05 % |
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Video
system |
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High-performance
image processing system with 132 MBytes/s data transfer rate
(compatible to European standard CCIR and US standard RS-170)
Up to 50 images/s digitizing speed (60 images/s with RS-170) |
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Measuring
methods |
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Sessile
and Captive Drop method
Tilting Plate method
Pendant Drop method
Optical Wilhelmy Plate and Lamella method |
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Temperature
measurement and range |
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2x
Pt100 input for -60 … 450 °C (Pt100 optional), 0.1 K
resolution; 1/3 DIN IEC 751 (± 0.03 %), class B |
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Size
of device (L x W x H) |
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590 x
220 x 550 mm |
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Weight |
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18 kg |
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Power
supply |
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100 …
240 VAC; 50 … 60 Hz; 55 VA |
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Alternative/Supplementary
units and accessories |
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Manual
and electrical single dosing units; manual and electrical multiple
dosing units; manual and electrical wafer stages and tilting base
assemblies; electrical tilting base unit; liquid, peltier and
electrical temperature control units (-10 … 400 °C); suction
plate; film sample holder; optical contact angle and surface
tension standards; dosing needles; syringes; PTFE-tubes;
temperature inert glass cells; complete PC systems |
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