Characterization of surface free energies of talc powders using the thin layer wicking technique

Emilio Lobato, Jinhong Zhang, Ismail Yildirim, Roe Hoan Yoon, Jorge Yordan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


Thin layer wicking technique was used to determine the contact angles (Θ) of different liquids on powdered talc samples. The measured contact angles were used to calculate the surface free energies (γ S) of talc and its components, which included dispersion (γ S AB), acidic (γ S d), basic (γ S +), and acid-base (γ S AB) surface free energies, using the van Oss-Chaudhury-Good (OCG) equation. The surface free energy characterization was conducted on both the basal and edge surfaces. The results showed that talc is a low surface energy solid, and that its basal surfaces are basic, while its edge surfaces are acidic. It has also been found that the hydrophobicity of talc increases with decreasing particle size, indicating that fracture occurs preferentially along the basal surface of talc. As the particle size is reduced beyond a certain limit, however, talc becomes increasingly hydrophilic, indicating that talc begins to fracture along the edge surfaces, thereby exposing more hydrophilic surfaces.

Original languageEnglish (US)
Title of host publicationFunctional Fillers and Nanoscale Minerals
Subtitle of host publicationNew Markets/New Horizons
Number of pages14
StatePublished - 2006
Event2006 SME Annual Conference - S. Louis, MO, United States
Duration: Mar 26 2006Mar 29 2006

Publication series

Name2006 SME Annual Conference - Functional Fillers and Nanoscale Minerals: New Markets/New Horizons


Other2006 SME Annual Conference
Country/TerritoryUnited States
CityS. Louis, MO

ASJC Scopus subject areas

  • General Engineering


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