scholarly journals Exploring molecular reorientations in amorphous and recrystallized felodipine at the microscopic level

RSC Advances ◽  
2020 ◽  
Vol 10 (61) ◽  
pp. 37346-37357
Author(s):  
A. Pajzderska ◽  
J. Jenczyk ◽  
J. P. Embs ◽  
J. Wąsicki
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Neutron Scattering ◽  
Experimental Methods ◽  
Microscopic Level ◽  
Nmr Relaxometry ◽  
Quasielastic Neutron ◽  
Quasielastic Neutron Scattering

Molecular reorientations were studied in amorphous, partially and fully recrystallized felodipine using a set of experimental methods: high-resolution solid-state nuclear magnetic resonance (NMR), relaxometry NMR and quasielastic neutron scattering (QENS).

Multinuclear high-resolution solid-state nuclear magnetic resonance studies of amorphous silica-aluminas

1991 ◽  
Vol 77 (1) ◽  
pp. 149-161 ◽  
Author(s):  
Claudine Dorémieux-Morin ◽  
Claudine Martin ◽  
Jean-Marie Brégeault ◽  
Jacques Fraissard
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Amorphous Silica ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

Structure of poorly-ordered aluminosilicates

Clay Minerals ◽  
1986 ◽  
Vol 21 (5) ◽  
pp. 879-897 ◽  
Author(s):  
M. A. Wilson ◽  
S. A. McCarthy ◽  
P. M. Fredericks
Keyword(s):  
Electron Microscopy ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Ftir Spectroscopy ◽  
Driving Forces ◽  
Repulsive Forces

AbstractThe structure of synthetic aluminosilicates prepared at pH 6 has been investigated by 29Si and 27Al high-resolution solid-state nuclear magnetic resonance (NMR) spectroscopy. Fourier transform infrared (FTIR) spectroscopy and electron microscopy have also been used to characterize the products. The amount of Si and Al in protoimogolite, disordered allophane and other structures has been measured. There is a fair correlation between the intensity of the 349 cm−1 band in the FTIR spectra and the proportion by weight of protoimogolite Si measured by NMR. It is shown that disordered allophanes have similar structures to those proposed by van Reeuwijk and de Villiers (Soil Sci. Soc. Am. Proc. 32 (1968) 238–240), i.e. octahedral Al surrounding a tetrahedral core. Moreover, it is clear that at high Al:Si ratios (⩾1:1), protoimogolite can compete with disordered allophane precursors for aluminum. The driving forces for formation of protoimogolite rather than allophane appear to be long range Al-Al repulsive forces through oxygen.

Conformation and dynamics of fibrous and membrane proteins as revealed by high-resolution solid-state nuclear magnetic resonance

1996 ◽  
Vol 101 (1) ◽  
pp. 71-79
Author(s):  
Hazime Saitǒ ◽  
Satoru Tuzi ◽  
Katsuyuki Nishimura ◽  
Akira Fukutani ◽  
Akira Naito
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Membrane Proteins ◽  
Nuclear Magnetic
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