New PDF release: Nuclear magnetic resonance: volume 45

By Ashbrook, Sharon E.; Ramesh, Vasudevan

ISBN-10: 1782620532

ISBN-13: 9781782620532

ISBN-10: 1782624104

ISBN-13: 9781782624103

ISBN-10: 178262869X

ISBN-13: 9781782628699

Application of nuclear magnetic resonance span quite a lot of clinical disciplines and for the 1st time this quantity will specialize in a speedily advancing and significant subject – NMR purposes in undefined. offering a accomplished but serious evaluation of the present literature from numerous commercial sectors together with fabrics, foodstuff technological know-how, paints and coatings, polymer technology, nuclear chemistry, drug discovery and method keep watch over, this quantity may be a useful resource of present equipment and functions. crucial examining for these eager to turn into quickly familiar with NMR and for the professional practitioner maintaining so far with the literature.

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183 considered the 22 | Nucl. Magn. 1039/9781782624103-00001 View Online effect of mechanochemical treatment of vermiculite clays, using 29Si NMR to show how this increases both the proportion of amorphous silica, and the number of surface hydroxyls. 106 The 29Si spectrum of the treated material showed the formation of Lu2Si2O7, while 27Al MAS NMR showed leaching of Al from the tetrahedral sheets. Modification of vermiculite clays has been followed using NMR,184 with the grafting of organosilanes confirmed by the appearance of new peaks (at À60 and À67 ppm) in the 29Si MAS NMR spectrum.

147 The illite group of clay minerals has general chemical composition (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10((OH)2,(H2O)), but many substitutions are possible. Structurally, illite is similar to the micas (particularly muscovite), but has fewer interlayer cations, reducing the bonding between layers and resulting in less regular stacking. 148 27Al MAS NMR of the illite clay showed mostly AlVI but confirmed a small amount of substitution of Al for Si in the tetrahedral layers. Heating (at 600 1C) produced a material with primarily AlIV, suggesting dehydroxylation had occurred.

77 with an investigation into the formation of surface layers and structural transformation during acid dissolution. Dissolution is strongly pH dependent – with reactions between pH 5 and 12 showing stoichiometric release of Ca and Si, but reactions at lower pH showing a preferential release of Ca. The reconstruction of the mineral was followed by 29Si NMR, with the Q2 species of unreacted wollastonite, replaced by Q3 and Q4 species as dissolution progressed and amorphous silica was produced. 78 also studied the in situ carbonation of wollastonite (supercritical CO2 at 160 bar) using high-pressure MAS equipment.

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Nuclear magnetic resonance: volume 45 by Ashbrook, Sharon E.; Ramesh, Vasudevan

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