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Surface free energy of a solid from contact angle hysteresis
1Department of Physical Chemistry-Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska University, 20031 Lublin, Poland. emil@hermes.umcs.lublin.pl
Advances in Colloid and Interface Science
|April 23, 2003
Summary
Contact angle hysteresis in n-alkanes and n-alcohols on FC-732 films is due to liquid film retention. This phenomenon allows for evaluating solid surface free energy and understanding molecular behavior.
Area of Science:
- Surface Science
- Physical Chemistry
- Materials Science
Background:
- Contact angle hysteresis is a key phenomenon in surface science.
- Understanding hysteresis is crucial for predicting liquid behavior on surfaces.
- Previous studies suggested liquid absorption/swelling as causes for hysteresis.
Purpose of the Study:
- To investigate the nature of contact angle hysteresis.
- To propose a method for evaluating solid surface free energy using contact angle hysteresis.
- To explain the differing behaviors of n-alkanes and n-alcohols on FC-732 films.
Main Methods:
- Analysis of dynamic advancing and receding contact angle data for n-alkanes and n-alcohols.
- Modeling hysteresis as a result of liquid film left behind the receding contact line.
- Utilizing literature data from Colloids Surf. A 189 (2001) 265.
Main Results:
- Contact angle hysteresis is attributed to the liquid film retained by the receding contact line.
- A novel approach is presented to determine solid surface free energy from hysteresis.
- Differences in molecular spacing and film structure explain varied behaviors of alkanes and alcohols.
Conclusions:
- Contact angle hysteresis provides a valuable tool for surface energy evaluation.
- The proposed mechanism clarifies the role of retained liquid films.
- Molecular-level interactions significantly influence surface wetting phenomena.