Role of hydrolyzed cations in the natural hydrophobicity of talc Article uri icon

abstract

  • Microflotation and electrokinetic studies indicate that the nonpolar (face) and polar (edge) surfaces of talc are affected differently by the adsorption of the hydrolyzed metal cations. The natural hydrophobicity of talc is unaltered by the presence of the hydroxo complex species of Al(III), Cr(III) and Fe(III), whereas the zeta potential of talc changes sign from negative to positive through the strong adsorption of these complex species onto the polar surfaces. Upon the precipitation of the cations to metal hydroxides the nonpolar surfaces are rendered hydrophilic at pH%27s below the PZC of the metal hydroxides, probably due to heterocoagulation of the metal precipitate on both the nonpolar and polar surfaces. © 1988.
  • Microflotation and electrokinetic studies indicate that the nonpolar (face) and polar (edge) surfaces of talc are affected differently by the adsorption of the hydrolyzed metal cations. The natural hydrophobicity of talc is unaltered by the presence of the hydroxo complex species of Al(III), Cr(III) and Fe(III), whereas the zeta potential of talc changes sign from negative to positive through the strong adsorption of these complex species onto the polar surfaces. Upon the precipitation of the cations to metal hydroxides the nonpolar surfaces are rendered hydrophilic at pH's below the PZC of the metal hydroxides, probably due to heterocoagulation of the metal precipitate on both the nonpolar and polar surfaces. © 1988.

publication date

  • 1988-01-01