Vermiculite-aliphatic amine interactions at the solid/liquid interface: a thermodynamic approach

  • Maria G. da Fonseca
  • Ramon K. S. Almeida
  • Albaneide F. Wanderley
  • Ulysses V. S. Ferreira
  • Luiza N. H. Arakaki
  • José A. Simoni
  • Claudio Airoldi


Polar n-alkylmonoamines of general formula H3C(CH2) n NH2 (n = 1, 3, 5) interacted with layered silicate vermiculite at the solid/liquid interface. The maximum amount of amine intercalated (N f ) inside the interlamellar space were 0.62, 0.46, and 0.38 mmol g−1, to give the following order of intercalation ethyl → butyl → hexylamines. The layered vermiculite solid was suspended in deionized water and calorimetrically titrated with this series of amines, to give favorable thermodynamic data, such as exothermic enthalpy, negative Gibbs free energy and positive entropy data.


Aliphatic amine Calorimetry Layered silicate Vermiculite 



The authors thank to CAPES and CNPq for financial support and fellowships.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2009

Authors and Affiliations

  • Maria G. da Fonseca
    • 1
  • Ramon K. S. Almeida
    • 1
  • Albaneide F. Wanderley
    • 1
  • Ulysses V. S. Ferreira
    • 1
  • Luiza N. H. Arakaki
    • 1
  • José A. Simoni
    • 2
  • Claudio Airoldi
    • 2
  1. 1.Departamento de Química, CCENUniversidade Federal da ParaíbaParaíbaBrazil
  2. 2.Instituto de QuímicaUniversidade Estadual de CampinasSão PauloBrazil

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