Tensiometer PAT1M - SINTERFACE

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Our PAT1M is based on this methodology and due to its modular architecture, compact design and highly accurate and efficient software it is one of the best instruments of this type worldwide. The process of measurement consists of the image acquisition of the drop/bubble profile, its digitalization and final fitting by the Gauss-Laplace equation. A fully computer controlled dosing system allows to perform pre-programmed measurements with any type of protocol, including constant drop volume or constant drop surface area. Changes of the drop/bubble area according to a given protocol, as it is the case for relaxation experiments, is also possible, i.e. the response of the interfacial layer to harmonic or transient area perturbations can be recorded and hence the surface dilational visco-elasticity determined. The method has many advantages over others, most of all it can be applied to liquid/gas and liquid/liquid interfaces, requires small amounts of liquid, and the temperature control is possible in a rather broad range. Even high temperature experiments are feasible with a special temperature cell.

  • High end full automatic profile analysis instrument
  • Modern method to measure surface and interfacial tension of liquids
  • Interfacial Rheology Studies are available in the basic version
  • Modular extensions for different applications

Principle is based  on the analysis  of  the shape of pendent and sessile drops or buoyant and captive bubbles.
Rheological studies are available in the basic version.
Well suited to determine the contact angle of liquids on solid surface.

Instrumental parts

- Basic platform on which all parts are safely mounted
- Manual x/y/z-axis
- Automatic computer-controlled precise dosing system
- Mechanically adjustable temperature controlled measuring cell (temperature range 10 to 100 °C)
- Industrial USB 3.0 CMOS camera with fixed objectives
- LED lighting with continuously adjustable intensity


Measurement Features
- Surface and interfacial tension of liquids
- Static  and  dynamic contact  angle according to the sessile drop method
- Determinanion of surface free energy
- Surface rheological studies to measure the dilational elasticity and viscosity
- Capillary pressure measurements for iso-dense liquid-liquid systems (optional modul DPA-1M)
- Surface   rheological  studies  at   higher   frequency (optional modul ODBA-1M)
- Direct  drop-drop,  bubble-bubble  and  drop-bubble interactions  (optional modul DBMM-1M)
- Fluid   dynamic  experiments  with  optional set-up incl. our own high speed video camera HSC

Main features of the software
- on-line interfacial tension/contact angle calculation
- very   accurate  control  loop  to  keep constant   either  volume  or  area of drop or bubble
- smooth oscillations with dosing system
- harmonic   and   transient   relaxation   experiments
- calculation  of  the  dilation  rheological parameters from   relaxation   measurements via Fourier analysis
- calculation of the surface free energy of solids (different methods)

Technical Specifications

Range of Surface and Interfacial tension
1 to 2000 mN/m
resolution: ± 0.01 mN/m
Range of contact angle measurement
1° to 179°

accuracy ±0.2°
built-in automatic dosing system
(optional second automatic dosing system)
Measuring options

surface / interfacial tension
dilational elasticity and viscosity
contact angle
surface free energy
drop/bubble oscillations 0.001 to 0.5 Hz (basic version)
up to 100 Hz (ODBA-1M module)
Additional measurement modules
drop pressure module DPA-1M
oscillating drop bubble oscillation module ODBA-1M
drop bubble micro manipulator DBMM-1M
manual fixed or zoom objectives
Industrial 3.1 MP CMOS-camera:
resolution 2048 x 1536 pixels
USB 3.0

Frame rate
Rates for standard camera:
60 images/s at resolution 2048x1536 pixels
370 images/s at resolution 640x480 pixels
740 images/s at resolution 640x240 pixels
1500 images/s at resolution 640x120 pixels
manual x-axis, manual y-axis, manual z-axis
LED, software controlled light intensity
Windows Application
free update over 1 year after purchase
Supported OS
Windows 7, 8, 8.1, 10 or 11
USB 3.0
Size of device (L xW x H)
700 x 200 x 270 mm (standard version)
3 kg
Power supply
external 100 … 240 AC to 24 VDC, 40 W
Extra accessories
adjustable temperature controlled cell
additional automatically controlled dosing system (up to 4 systems)
coaxial double capillary for drop exchange
liquid exchange cell
piezo control unit
special contact angle cell
high temperature cells
SINTERFACE Technologies e.K
Müggelseedamm 70
12587 Berlin

+49 (0)30 23544406
+49 (0)30 23535716

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