Journal of Material Sciences & Engineering

Gisèle L Lecomte-Nana

Publications

• Research Article
  ²⁹Si and ²⁷Al MAS NMR Characterization of the Structural Evolution of a Lateritic Clay under Acidic and Alkaline Treatments
  Author(s): Herve Goure-Doubi, Valérie Montouillout, Gisèle L Lecomte-Nana, Benoît Naît-Ali, Léon Koffi Konan and Agnès SmithHerve Goure-Doubi, Valérie Montouillout, Gisèle L Lecomte-Nana, Benoît Naît-Ali, Léon Koffi Konan and Agnès Smith
  
  In the present work the modifications induced by the geomimetic processing on the environment of silicon and aluminum atoms are finely characterized by solid state MAS NMR. The raw clay (Lat), a lateritic clay from Yaoundé (Cameroon), contains kaolinite, quartz, hematite and goethite as major mineral phases. This material is treated under acidic conditions during 24 h (LatAF) and then under alkaline conditions during 18 days, leading to the final consolidated “geomimetic” product (LatAFCH). The samples have been characterized by 29Si and 27Al solid state NMR at each step of the process.The NMR spectra obtained for the starting clay indicate the presence of AlIV and AlVI populations together with silicon Q2 (0 or 1Al) and Q3 (0 or 1Al) environments located at δiso=-83 ppm .. Read More»
  DOI: 10.4172/2169-0022.1000409

  Abstract PDF