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Dehydration Process of Hofmann-Type Layered Solids.

Omar Reyes-Martinez1, Enelio Torres-García2, Geonel Rodríguez-Gattorno3

  • 1Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Unidad Legaria, Instituto Politécnico Nacional, Legaria 694, Colonia, Irrigación, México D.F. 11500, Mexico. oreyesm0621@hotmail.com.

Materials (Basel, Switzerland)
|August 16, 2017
PubMed
Summary

The dehydration of layered solids M(H₂O)₂[Ni(CN)₄]·nH₂O involves overcoming energy barriers for water diffusion. Structural collapse occurs during dehydration, limiting reversibility above 80 °C.

Keywords:
dehydration of lamellar solidshi-res/modulated-TGkinetics parametersporous lattices

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Inorganic Chemistry

Background:

  • Layered solids M(H₂O)₂[Ni(CN)₄]·nH₂O (M = Ni, Co, Mn; n = 1, 2, 4) are investigated.
  • Understanding dehydration mechanisms is crucial for materials stability and applications.

Purpose of the Study:

  • To investigate the dehydration process of layered solids M(H₂O)₂[Ni(CN)₄]·nH₂O.
  • To determine the kinetic parameters and structural changes associated with water removal.

Main Methods:

  • Modulated thermogravimetry was employed to study the dehydration kinetics.
  • X-ray diffraction was used to analyze structural changes during the process.

Main Results:

  • Water molecules require significant activation energy (63–500 kJ/mol) for interlayer diffusion.
  • Dehydration kinetics are dependent on water partial pressure.
  • Framework collapse accompanies dehydration, leading to loss of structural order above 80 °C.
  • The ordered structure is maintained below 80 °C, indicating limited structural reversibility.

Conclusions:

  • The dehydration of these layered solids is an energetically demanding process.
  • Framework collapse limits structural reversibility, except at lower temperatures.
  • Water removal significantly impacts the long-range structural order of the investigated materials.