Probing the Dynamics of Layered Double Hydroxides by Solid-State 27Al NMR Spectroscopy

2017 ◽  
Vol 121 (13) ◽  
pp. 7276-7281 ◽  
Author(s):  
Arnaud Di Bitetto ◽  
Erwan André ◽  
Cédric Carteret ◽  
Pierrick Durand ◽  
Gwendal Kervern
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Layered Double Hydroxides ◽  
27Al Nmr ◽  
27Al Nmr Spectroscopy ◽  
Double Hydroxides

A Study of Silver Species on Silver-Exchanged ETS-10 and Mordenite by XRD, SEM and Solid-State 109Ag, 29Si and 27Al NMR Spectroscopy

2012 ◽  
Vol 12 (8) ◽  
pp. 6420-6427 ◽  
Author(s):  
Yan Liu ◽  
Fu Chen ◽  
Roderick E. Wasylishen ◽  
Zhenghe Xu ◽  
James Sawada ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
27Al Nmr ◽  
27Al Nmr Spectroscopy

Aluminium coordination and structural disorder in halloysite and kaolinite by 27Al NMR spectroscopy

Clay Minerals ◽  
1994 ◽  
Vol 29 (3) ◽  
pp. 305-312 ◽  
Author(s):  
R.H. Newman ◽  
C.W. Childs ◽  
G.J. Churchman
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
High Field ◽  
Low Frequency ◽  
Crystallinity Index ◽  
Structural Disorder ◽  
Interlayer Water ◽  
27Al Nmr ◽  
Octahedral Sheet ◽  
27Al Nmr Spectroscopy

AbstractIt has been suggested that interlayer water in halloysite is due to the presence of hydrated cations that balance the negative layer charge produced by Al for Si substitution. To find evidence of 4-coordinate Al (Al(IV)), we investigated six halloysites and two kaolinites using ‘high-field’ and ‘medium-field’ solid-state 27Al MAS NMR spectroscopy. We found Al(IV) in both kaolinite and five halloysite samples, but the contents are all <1% and provide no basis for distinguishing between kaolinite and halloysite. Therefore, the presence of interlayer water in halloysite cannot be attributed to Al for Si substitution. There are, however, signals, tentatively assigned to A1(V), present in the kaolinite spectra but not in the halloysite spectra. The shapes of the low-frequency ‘tails’ of Al(VI) signals in medium-field NMR vary from sample to sample. We interpret this variation in terms of a ‘crystallinity index’. Disorder in kaolinite appears to be primarily the result of Al-vacancy displacements in the octahedral sheet. The NMR crystallinity indices correlate with those from IRS and DTA but not with those from XRD.

scholarly journals Reconsideration on Al Coordination in CaO–SiO2–Al2O3–(R2O or RO) Glasses by Using High Field Solid-State 27Al NMR Spectroscopy

2011 ◽  
Vol 51 (2) ◽  
pp. 333-335 ◽  
Author(s):  
Sohei Sukenaga ◽  
Tetsuya Nagahisa ◽  
Koji Kanehashi ◽  
Noritaka Saito ◽  
Kunihiko Nakashima
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
High Field ◽  
27Al Nmr ◽  
27Al Nmr Spectroscopy

scholarly journals The distribution of reactive Ni2+ in 2D Mg2−xNixAl-LDH nanohybrid materials determined by solid state 27Al MAS NMR spectroscopy

2018 ◽  
Vol 20 (39) ◽  
pp. 25335-25342 ◽  
Author(s):  
Nicholai Daugaard Jensen ◽  
Claude Forano ◽  
Suraj Shiv Charan Pushparaj ◽  
Yusuke Nishiyama ◽  
Belayneh Bekele ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Layered Double Hydroxides ◽  
Binomial Distribution ◽  
Mas Nmr ◽  
27Al Mas Nmr ◽  
Nanohybrid Materials ◽  
Double Hydroxides

The distribution of Ni2+ in paramagnetic Mg2−xNixAl layered double hydroxides obeys a binomial distribution according to 27Al MAS NMR spectroscopy.

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