TY - JOUR
T1 - Influence of synthesis conditions on growth of Ni-doped chrysotile
AU - Bloise, A.
AU - Belluso, E.
AU - Fornero, E.
AU - Rinaudo, C.
AU - Barrese, E.
AU - Capella, S.
N1 - Funding Information:
Research financially supported by Fondazione Compagnia di San Paolo, Università degli Studi di Torino and Università degli Studi della Calabria . The authors grateful to two anonymous reviewers for their helpful comment and indications.
PY - 2010/7
Y1 - 2010/7
N2 - Ni-doped chrysotile fibers were synthesized in hydrothermal conditions at 300-350 °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 μ-Raman spectroscopy allowed to study the effect of Ni doping on the chemical/physical characteristics of the chrysotile fibers.
AB - Ni-doped chrysotile fibers were synthesized in hydrothermal conditions at 300-350 °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 μ-Raman spectroscopy allowed to study the effect of Ni doping on the chemical/physical characteristics of the chrysotile fibers.
KW - Hydrothermal synthesis conditions
KW - Ni-doped synthetic chrysotile
KW - Starting materials
UR - http://www.scopus.com/inward/record.url?scp=77950340631&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2010.03.003
DO - 10.1016/j.micromeso.2010.03.003
M3 - Article
SN - 1387-1811
VL - 132
SP - 239
EP - 245
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1-2
ER -