1H, 19F and 29Si MAS NMR investigations of synthetic lepidolite samples with variable OH/F ratios
نویسندگان
چکیده
منابع مشابه
High-resolution 19F and 1H NMR of a vinylidenefluoride telomer
The reaction products of vinylidenefluoride (VDF) with methanol as a telogen have been analysed in the solution state by H and F nuclear magnetic resonance (NMR). Highresolution F and H NMR spectra were achieved using high-power H and F decoupling respectively, giving superior resolution and revealing previously unresolved signals of the vinylidenefluoride telomer (VDFT). H and F homoand hetero...
متن کاملSolid-State 29Si VACP/MAS NMR Studies of Silicon-Accumulating Plants: Structural Characterization of Biosilica Deposits
Z. Naturforsch. 55 b, 459—461 (2000); received February 21, 2000 Biomineralization, Silica, Silicon-Accumulating Plants A series of silicon-accumulating plants [different Equisetum (horse tail) species, Echium vulgare, and Symphytum officinale] were studied by solid-state 29Si NMR experiments. For this purpose, selected parts of these plants were freeze-dried and then investigated by solid-stat...
متن کاملInteractions between Nafion resin and protonated dodecylamine modified montmorillonite: a solid state NMR study.
A series of nanocomposites have been prepared from perfluorosulfonylfluoride copolymer resin (Nafion) and layered montmorillonite (MMT) modified with protonated dodecylamine by conventional sol-gel intercalation. The structure of these nanocomposite materials have been characterized using FT-IR, elemental analysis, XRD and solid state NMR techniques, including 19F magic-angle spinning (MAS) NMR...
متن کاملNUCLEAR MAGNETIC RESONANCE STUDY OF Al:Si AND F:OH ORDER IN ZUNYITE
Zunyite [Al13Si5O20(OH,F)18Cl] possesses an unusual combination of an Al13O16(OH)24 Keggin structure and a Si5O16 pentamer unit. We used 19F, 27Al, 29Si MAS and 27Al MQMAS NMR spectroscopy of a series of samples with varying Al:Si and F:OH ratios to investigate the degree of atomic order in zunyite. The quadrupole coupling constant (CQ) and asymmetry parameter ( ) obtained from simulations of 2...
متن کاملA Solid-State NMR Investigation of MQ Silicone Copolymers
The structure of MQ copolymers of the general chemical formula [(CH3)3SiO0.5]m [SiO2]n was characterized by means of solid-state magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. The MQ copolymers are highly branched polycyclic compounds (densely cross-linked nanosized networks). MQ copolymers were prepared by hydrolytic polycondensation in active medium. 29Si NMR spectr...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations and Advances
سال: 2019
ISSN: 2053-2733
DOI: 10.1107/s2053273319089460