NUCLEAR MAGNETIC RESONANCE IN SOLIDS

The methodological textbook for laboratory work "Nuclear magnetic resonance in solids" for the master course students recounts the basics of the nuclear magnetic resonance theory in diamagnetic insulating crystals and the experimental principles of nuclear magnetic resonance signals detection by continuous wave and pulsed methods, and also a calculation procedure of the nuclear magnetic resonance line shape as obtained in experiment. The textbook gives a short description and operation principle of laboratory NMR setups.9

Thermal modification of wood and a complex study of its properties by magnetic resonance and other methods

© 2016, Springer-Verlag Berlin Heidelberg.Thermal modification of wood is an effective method to improve some of the properties of wood. It is reported on studies of vacuum thermal-treated wood species by magnetic resonance methods. Wood species such as Scots pine (Pinus sylvestris), birch (Betula pendula), Russian larch (Larix sibirica), Norway spruce (Picea abies), small-leaved lime (Tilia cordata) were vacuum treated by heat at 220 °C with various durations up to 8 h. This selection of wood species was investigated by electron paramagnetic resonance, nuclear magnetic resonance and microscopy methods before and after the thermal treatment. Electron paramagnetic resonance experiments revealed changes in the amount of free radicals in samples with the thermal treatment duration. Additional information on magnetic relaxation of 1H nuclei in samples at room temperature was obtained. Optical microscope analysis helped to detect structural changes in the thermally modified wood. Important properties of wood such as wood hardness and humidity absorption were also studied. The original results that were obtained correlate and complement each other, and clarify changes in the wood structure that appear with the heat treatment

Nuclear magnetic relaxation caused by fluctuations of ultrafine fields

In the paper the substances with strong correlation of electron moments were investigated with the aim of determination of the regularities in the nuclear magnetic relaxation in the dielectric paramagnetics and dipole ferromagnetics. During the investigation the methods of stationary and pulse nuclear magnetic resonance were used as well as the fast-response digital memories. As a result the model of the angular distribution of the particles in the magnetic-oriented powders was suggested. The results obtained may find their field of application in the development of theoretical ideas about the magnetic electron-nucleus interaction in solid bodies as well as in the investigation of properties of dielectrics and high-temperature superconductorsAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

Thermal modification of wood and a complex study of its properties by magnetic resonance and other methods

© 2016, Springer-Verlag Berlin Heidelberg.Thermal modification of wood is an effective method to improve some of the properties of wood. It is reported on studies of vacuum thermal-treated wood species by magnetic resonance methods. Wood species such as Scots pine (Pinus sylvestris), birch (Betula pendula), Russian larch (Larix sibirica), Norway spruce (Picea abies), small-leaved lime (Tilia cordata) were vacuum treated by heat at 220 °C with various durations up to 8 h. This selection of wood species was investigated by electron paramagnetic resonance, nuclear magnetic resonance and microscopy methods before and after the thermal treatment. Electron paramagnetic resonance experiments revealed changes in the amount of free radicals in samples with the thermal treatment duration. Additional information on magnetic relaxation of 1H nuclei in samples at room temperature was obtained. Optical microscope analysis helped to detect structural changes in the thermally modified wood. Important properties of wood such as wood hardness and humidity absorption were also studied. The original results that were obtained correlate and complement each other, and clarify changes in the wood structure that appear with the heat treatment

Van Vleck paramagnets - new features in comparison of LiTmF4 and Li(Tm0.02Y0.98)F4: NMR study

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