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Cation Redistribution along the Spiral of Ni‐Doped Phyllosilicate Nanoscrolls: Energy Modelling and STEM/EDS Study
Author(s) -
Krasilin Andrei A.,
Khrapova Ekaterina K.,
Nominé Alexandre,
Ghanbaja Jaafar,
Belmonte Thierry,
Gusarov Victor V.
Publication year - 2019
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201801144
Subject(s) - scanning transmission electron microscopy , materials science , doping , energy dispersive x ray spectroscopy , chemical engineering , curvature , oxide , elastic energy , transmission electron microscopy , scanning electron microscope , nanotechnology , chemistry , crystallography , composite material , metallurgy , thermodynamics , physics , optoelectronics , geometry , mathematics , engineering
Here, we study the stress‐induced self‐organization of Mg 2+ and Ni 2+ cations in the crystal structure of multiwalled (Mg 1– x ,Ni x ) 3 Si 2 O 5 (OH) 4 phyllosilicate nanoscrolls. The phyllosilicate layer strives to compensate size and surface energy difference between the metal oxide and silica sheets by curling. But as soon as the layer grows, the scrolling mechanism becomes a spent force. An energy model proposes secondary compensation of strain: two cations distribute along the nanoscroll spiral in accordance with preferable radii of curvature. To reveal this, we study synthetic (Mg 1– x ,Ni x ) 3 Si 2 O 5 (OH) 4 nanoscrolls by the scanning transmission electron microscopy/energy‐dispersive X‐ray spectroscopy (STEM/EDS) technique. For a number of scrolls, we have found indeed a change of Ni concentration with increase in distance from the nanoscroll central axis. The concentration gradient, according to our estimates, can reach 50 at.% over 25 nm of the wall thickness.