Surface tension

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What is determined with this method?

  • The method allows the determination of the dynamic surface tension of liquids with the bubble pressure method.
  • Air bubbles are generated on a capillary immersed in the liquid.
  • The pressured required for bubble formation is measured and converted into surface tensions using the Young-Laplace equation.
  • By varying the generation speed of the bubbles, the dependency of the surface tensions on the surface age (bubble lifetime) can be recorded.

Measuring range:

  • Maximum pressure: 1.25 kPa
  • Surface tension: 10 to 100 mN/m
  • Temperature range (liquid): 0 to 100 °C
  • Bubble lifetime: 10 to 30000 ms
  • Min. required sample volume: 15 mL

What is evaluated with this method?

  • Analysis of the mobility and the dynamic behaviour of surfactants and surfactant-like substances (charged polymers) in solution

Examples of application of the method by material

  • Change in dynamic surface tension when surfactants are added to coating colours and liquids
  • Checking the purity of water (surface tension = quality parameter)
  • Concentration control of surfactants in solution

What insights do customers gain about your products/samples with this method?

  • Determination of the presence of surfactants in solutions, their concentration and whether they are short-chain or long-chain molecules
  • Calculation of diffusion and adsorption coefficients of surfactants

In which company or process area are these methods applied?

  • Process: quality control
  • Company: product development, research

Which problems can this method solve / recognise at the customer?

  • Detecting impurities in liquids (quality control)
  • Investigation of the behaviour of surfactants and surfactant-like substances in solution (interaction with other ingredients, micelle formation, etc.)

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