Formulation Material Selection

Contact Angle: Decisive Surface Data from a Single Test

Contact Angle: Decisive Surface Data from a Single Test
Language: English
Length: 90 min
Recorded on: 26 Jan 16

Package Includes

6 month access to Course Recording, Presentation Slides, Q&A Transcript

Course Description

Obtain decisive data without running expensive tests to assess surface roughness, uniformity of treatment, release agents residues, weak boundary layers, wettability, printability, over treatment…

(Re)Discover the range of information that can be extracted from Contact Angle Measurements, a simple & far-too-often misused test. 
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Ian Sutherland
Ian Sutherland
SpecialChem expert
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Dr. Sutherland received a PhD in Physical Chemistry from the University of Bristol in 1983 for his work on the surface chemistry of titanium dioxide. He moved to Loughborough University, initially working in the surface analysis group in the Department of Physics. Later, he joined the Chemistry Department as a lecturer/senior lecturer, where he established a research group focused on polymer surfaces and interfaces.

The research group designed and built contact angle apparatus, which was used extensively in their work on adhesion and wettability. Many of the topics studied have been applied and partially funded by industry.

Dr. Sutherland currently works as a consultant and continues to lecture part-time at Loughborough University, where he is a visiting research fellow.

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Why should you view this course?

Today, most people measure contact angle as if their surface were ideal and they end up with not really reproducible data, which limits the interest to an estimation of the surface tension...
But with your current equipment and an improved approach to contact angle measurements, you can obtain insightful data about surface roughness & uniformity. Join this course and:

  1. Clarify why you face reliability issues with contact angle data and how to proceed when testing non-ideal surfaces to get full benefit from this simple test.

  2. Get guidance to determine by yourselves contact angle hysteresis (measuring advancing & receding contact angles): the key to get data on release agents residues, weak boundary layers, wettability, printability, over-treatment...

  3. Get the clues to interpret contact angle hysteresis and extract the surface info you need with step-by-step explanations on real cases.

Who should join this course?

  • Packaging manufacturers wishing to print on films

  • WB coatings, inks, adhesives formulators & users (wettability issues)

  • Producers & users of extruded & molded parts (release agents residues)

  • Laminated / multilayer films manufacturers

  • This course is suitable for intermediate level proficiency
    Intermediate
Course Outline

The following sections will be covered during this session:

Contact angle and surface energy

  • Surface free energy
  • Primary (ionic/covalent) chemical bonds
  • Van der Waals forces

Work of adhesion

  • Young Equation
  • Thermodynamic Work of Adhesion & Contact Angle

Non-ideal surfaces and contact angle hysteresis

  • Spreading pressure
  • Advancing angle & Receding angle
  • Causes of contact angle hysteresis: surface roughness, heterogeneous surface

Interpretation of contact angle data

  • Polar and non-polar contributions
  • Surface treatments assessment
  • Surface characterization

Practical examples of applications of contact angle

  • High surface energy: surface contamination, wettability
  • Low surface energy: polarity of the surface, weak boundary layer
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Contact Angle: Decisive Surface Data from a Single Test
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