Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 132, Issue 1-2, Pages 239-245Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2010.03.003
Keywords
Ni-doped synthetic chrysotile; Starting materials; Hydrothermal synthesis conditions
Categories
Funding
- Fondazione Compagnia di San Paolo
- Universita degli Studi di Torino
- Universita degli Studi della Calabria
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Ni-doped chrysotile fibers were synthesized in hydrothermal conditions at 300-350 degrees C, 15-200 MPa, 160-312 h treatment times and pH 5-10. The starting materials and run products were characterized by X-ray powder diffraction (XRPD) and by scanning and transmission electron microscopy, both with annexed energy-dispersive spectrometry (SEM/EDS and TEM/EDS, respectively). The growth of Ni-doped chrysotile fibers depends greatly on the starting materials: they are observed as run products only starting from synthetic Ni-doped forsterite. When oxides are used as starting phases, even in the same hydrothermal conditions, the growth of Ni-doped talc is observed. As regards the morphology of synthesized chrysotile fibers, under the conditions of the present work, cone-in-cone crystals were prevalent, but other morphologies were also detected, all showing well-defined crystallinity, as revealed by electron diffraction patterns of selected areas (SAED). Fibers with cylindrical shape showed outer diameters ranging from 37 to 52 nm and a central hollow (empty core) ranging from 6 to 10 nm. The average concentrations of nickel oxide in chrysotile fibers varied from 4 to 11 (wt%). Further characterization by differential scanning calorimetry (DSC)/thermogravimetric (TG) and by mu-Raman spectroscopy allowed to study the effect of Ni doping on the chemical/physical characteristics of the chrysotile fibers. (C) 2010 Elsevier Inc. All rights reserved.
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