CSC Scientific Company  DuNouy Tensiometer
DuNouy Tensiometer       •   The CSC DuNouy Tensiometer helps           decorative and hard chrome platers           meet ...
DuNouy Tensiometer   •The Precision DuNouy Tensiometer    measures upward surface tension.  •The Interfacial DuNouy Tensio...
Applications•paints, coatings and inks;•chrome, nickel, and brass plating;•soap;•surfactants;•emulsions;•crude and transfo...
DuNouy Tensiometer •RAPID MEASUREMENT  Ring method allows readings to be made in 15-30 seconds•DIRECT READING Equipped wit...
Intermolecular forces as they   effect Interfacial Tension                A layer of molecules on an oil’s                ...
Measurement Techniques            The most common method of            measuring surface /interfacial            tension  ...
Interfacial Test
Comparing Oil Oxidation Sensitivity UsingInterfacial Tension and Neutralization Number                           When oils...
Different ways Surface Tension          is Measured
Wilhelmy Plate
DuNouy Ring
How is Surface Tension Measured?
CSC Rings
CSC DuNouy Tensiometer
DuNouy Precision Tensiometer       How it works
DuNouy Interfacial Tensiometer        How it works
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CSC Scientific duNouy Tensiometer

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The CSC duNouy Tensiometer is a laboratory Instrument for the purpose of determining the strength of a liquid surface. Test is used in coatings and industries. Applications are also in chemical, pharmaceutical and electric power applications.

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  • if some more different methods for surface tension determination is presented ,it would be more better.
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CSC Scientific duNouy Tensiometer

  1. 1. CSC Scientific Company DuNouy Tensiometer
  2. 2. DuNouy Tensiometer • The CSC DuNouy Tensiometer helps decorative and hard chrome platers meet the EPA regulations on chromium emissions. The regulations state that there is a direct relationship between surface tension and chromium emission. • The interfacial tension test is the most valuable single test that can be used to evaluate a turbine oil. It is generally agreed that when the interfacial tension is between 15 and 20 dynes/cm, deposits may or may not be forming in the system.
  3. 3. DuNouy Tensiometer •The Precision DuNouy Tensiometer measures upward surface tension. •The Interfacial DuNouy Tensiometer measures both upward and downward forces.Both units are delivered complete with platinum iridium ringand carrying case allowing you to get rapid measurement in15 to 30 seconds right out of the box.
  4. 4. Applications•paints, coatings and inks;•chrome, nickel, and brass plating;•soap;•surfactants;•emulsions;•crude and transformer oils.•universities and technical centers as an important instrument for scientific studies.
  5. 5. DuNouy Tensiometer •RAPID MEASUREMENT Ring method allows readings to be made in 15-30 seconds•DIRECT READING Equipped with circular scale in dyne/cm - No Calculations needed.•REPRODUCTIBLE RESULTS Accurate readings can be reproduced within +/- 0.05 dyne/cm•PORTABILITY Compact unit comes with a carrying case for easy transport•STABILITY Mounted on a cast tripod support with convenient leveling screws
  6. 6. Intermolecular forces as they effect Interfacial Tension A layer of molecules on an oil’s surface are in contact with air (Fig 1) the molecules are more strongly attracted from below because the molecules in the air are further apart (the attraction is inversely proportional to the distance between the molecules). A similar imbalance occurs between two immiscible liquids such as oil and water; in this case the phenomenon is called interfacial tension.
  7. 7. Measurement Techniques The most common method of measuring surface /interfacial tension In the test (Figures 2 and 3), the force required to lift a horizontal platinum wire ring away from the oil’s surface is measured either directly (surface tension) or at an oil/water interface (interfacial tension). The unit of measure for surface tension is dynes per centimeter (equal to mN/m).
  8. 8. Interfacial Test
  9. 9. Comparing Oil Oxidation Sensitivity UsingInterfacial Tension and Neutralization Number When oils oxidize they form soluble and insoluble hydrophilic compounds. Many of these compounds can alter the IFT of a lubricant long before there is any noticeable change in acid number or viscosity (Fig 4).
  10. 10. Different ways Surface Tension is Measured
  11. 11. Wilhelmy Plate
  12. 12. DuNouy Ring
  13. 13. How is Surface Tension Measured?
  14. 14. CSC Rings
  15. 15. CSC DuNouy Tensiometer
  16. 16. DuNouy Precision Tensiometer How it works
  17. 17. DuNouy Interfacial Tensiometer How it works

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