Abstract
The influence of different surface energies described by Hansen solubility parameters (HSP) on the exfoliation of organophilic fluoromicas is investigated. HSP values of four synthetic organophilic fluoromica with different surfactants have been predetermined. Those surfactants change the fluoromica surface energies described by HSP. The HSP are used to calculate the dispersibility of the various organophilic fluoromica in chloroform via Flory-Huggins (F-H) theory. The F-H parameter (χ) describes the effective difference in HSP related surface energies of particles and chloroform molecules, which is related to the energy cost of exfoliation. An influence of F-H parameter is detected on the delamination state of organophilic fluoromica. The delamination state is evaluated quantitatively using atomic force microscopy (AFM). In the case of a high F-H parameter (χ > 0.15), aggregated and unstable fluoromica dispersions are obtained. Whereas in the case of F-H parameters near zero, exfoliated and stable fluoromica dispersions are achieved. The presence of surfactant on the surface of exfoliated fluoromica flakes is proven by Fourier-transform infrared spectroscopy (FT-IR), and density functional theory (DFT) calculation.
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