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Tensiometer / Goniometer

Surface / Interfacial tensiometer is an ideal device used to determine water (soil moisture) potential tension in the vadose zone. It’s widely used to inspect the insulation oil materials in irrigation works, electric power department; or research and education work in petroleum, chemical engineering, science academy. 

Contact angle meters  (also known as optical tensiometers or goniometers) allow direct measurements of surface tension, interfacial tension and contact angles.  Contact angle is an extremely versatile technique used for characterization of both liquids and solids.

UnitedTest Popular Tensiometer / Goniometer

Manual surface tensiometer

Model: TEN180, ASTM D1590

Feature:

  • Manual mechanical
  • dial reading test result

Key parameter:

  • Measuring range: 0~180mN/m
  • Min. dial scale/ resolution: 1mN/m
Details

Du Nouy Ring Surface Interfacial Tensiometer

Model: TEN201/TEN202, ASTM D1590, ISO 304, ISO 6295

Feature:

  • Motorized automatic
  • Automatic show the test result
  • one key adjust Zero point

Key parameter:

  • Measuring range: 0~200mN/m
  • Min. dial scale/ resolution: 0.01mN/m
Details

PC controlled Interfacial tensiometer

Model: TEN201/TEN202, ASTM D1590, ISO 304, ISO 6295

Feature:

  • Motorized automatic
  • Computer control
  • Peak value holding function;Automatic stop when the liquid film break

Key parameter:

  • Measuring range: 0~200mN/m
  • Min. dial scale/ resolution: 0.01mN/m
Details

Interface, surface Tensiometer

Model: TEN302, ASTM D1590, ISO 304, ISO 6295

Feature:

  • Two methods: Wihelmy plate/Du Nouy ring.
  • Built-in precision electronic analysis balance
  • Computer control

Key parameter:

  • Measuring range: 1~1000mN/m
  • Min. dial scale/ resolution: 0.01mN/m
Details

contact angle goniometer

Model: CAG100/CAG200

Feature:

  • Sessile drop, Solid surface energy, pendant drop, Rotate falling, Insert method
  • with 360 degree working table

Key parameter:

  • Contact angle measuring range: 0<θ<180°
  • Measuring accuracy: 0.1°
Details

Feature:

  • Methods: bubble
  • Computer control

Key parameter:

  • Measuring range: 10~100mN/m
  • Min. dial scale/ resolution: 0.01mN/m
  • Accuracy: 0.1 mN/m
Details

Introduction of Surface / Interfacial tension test and contact angel

Interfacial tension of a liquid describes the tension force that counteracts an enlargement of the interface. It allows conclusions to be drawn about how well the liquid spreads on a solid or mixes with another liquid.


Surface tension: To measure the surface tension between a liquid and the air, the Tensiometer duNouy ring is placed below the surface of the liquid. This test is performed by pulling the ring upward through the surface of the liquid. The force needed for the ring to break the surface (overcome the surface tension) is determined.


Interfacial tension: There are applications where the surface tension at the boundary of two liquids needs to be measured. This is called interfacial surface tension.


Du Nouy ring method:  The du Nouy ring method is one technique by which the surface tension of a liquid can be measured. The method involves slowly lifting a ring, often made of platinum, from the surface of a liquid. The force required to raise the ring from the liquid's surface is measured and related to the liquid's surface tension.

Du Nouy ring method.jpg

Wilhelmy plate method: is a force-based measuring method for determining the interfacial and surface tension of a liquid. A tensiometer with a high-precision balance is required to carry out this measurement. The so-called Wilhelmy-equation is then used for the calculation.

whilhelmy_plate.jpg

Surface / Interfacial tensiometer is an ideal device used to determine water (soil moisture) potential tension in the vadose zone. It's widely used to inspect the insulation oil materials in irrigation works, electric power department; or research and education work in petroleum, chemical engineering, science academy. The Tensiometer for this test needs to pull the ring up through the boundary between the lower, higher density liquid, and the liquid that is floating above. The force needed to break through the surface of the higher density liquid is recorded as interfacial surface tension.The force needed to break the boundary going from the floating liquid to the greater density liquid is measured by pushing the ring down through the boundary.


What is Contact Angle? 

Contact Angle, θ, is a measurement that quantifies the wetting of a solid by a liquid. It is defined geometrically as the angle formed by a liquid at the three-phase boundary point where a liquid, gas, and solid intersect. The well-known Young Equation describes the balance at the three-phase contact of solid, liquid, and gas.


What is Wettability?

Wettability refers to the tendency of liquids to spread across a surface of interest. It is commonly characterized by using water as the probe liquid for a static contact angle measurement. In general, surfaces on which the liquid tends to spread out, forming a flatter droplet, are described as having good wetting or high wettability. Surfaces on which liquid tends to “ball up” are described as having poor wetting or low wettability. 

Contact angle test.jpg


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