Abstract
Inverse gas chromatography (IGC), at zero surface coverage, has been used to follow the variation of the surface free energy characteristics of muscovite samples after grinding either in water or in organic media. For initial mica, the value of γ S D measured through IGC, is in agreement with the values given by other methods (30 mJ/m 2 After grinding, γ S D increases and reaches a value of 90 mJ/m 2 when the operation is performed in methanol. At the same time, the acid/base surface properties change as qualitatively indicated by IGC. The variation in surface characteristics, upon grinding, may have significant consequences for the utilization of mica as a filler for composite materials.
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