Field-cycling NMR relaxometry of viscous liquids and polymers

Proton spin dynamics in polymer melts: New perspectives for experimental investigations of polymer dynamics

“…Therefore in the limit 1 1 ωτ ≤ , the frequency dispersion of the total spin-lattice relaxation rate will always be determined by the intermolecular interactions, a fact well documented by recent experiments with polymer melts [12,13,[27][28].…”

“…The dynamics of the investigated systems is mainly reflected through characteristic features of nuclear spin relaxations. Important findings of recent years [7,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], affecting the understanding of the proton spin dynamics in polymer melts are the subject of discussion of this paper.…”

Relation of short-range and long-range lithium ion dynamics in glass-ceramics: Insights fromLi7NMR field-cycling and field-gradient studies

“…Motivated by previous FC work, 26 including our 7 Li FC studies, 17,18 we exploit the fluctuation-dissipation relation between the imaginary parts of dynamic susceptibilities and the spectral densities, χ ′′ (ω) = ωJ(ω), and present the results in the form of a generalized 'NMR susceptibiliy' defined as χ…”

Structural Dynamic Study of Roof Waterproofing Materials

“…Then comes the registration of the magnetization projection of the analyzed bitumen sample on the direction of the constant magnetic field through a fixed time interval after exposure of each pair of magnetic field pulses. In order to increase the informativity of the mode, the initial value of the magnetization projection of the analyzed bitumen sample on the direction of the constant magnetic field is recorded beforehand, whereupon the measuring cycle is performed twice at a sample temperature of 40 °C and 100 °C, respectively (Xu et al, 2013;Kruk et al, 2012;Haber-Pohlmeier et al, 2013). And after each measuring cycle the amplitude of the transverse magnetization of the analyzed sample is determined by extrapolating the linear part of the logarithm of the projection of the sample magnetization and the time interval between the pulses of the magnetic field onto zero time interval between the pulses and then the group content of oils, asphaltenes and resins is determined from the relations: P A =A 1 ·100/A 0 ; P C =(A 0 -A 2 )·100/A 0 , P B =100-P A -P C , where P A , P C , P B -oils, asphaltenes and resins content in the analyzed sample, respectively, mass %; A 0 -the initial value of the projection of the sample magnetization; A 1 and A 2 -the values of amplitude of the transverse magnetization, determined at sample temperature of 40 °C and 100 °C, respectively.…”

“…It should be noted that the study of NMR spectra is based on the resonating nuclei systems that are extremely sensitive to the magnetic environment where the local magnetic fields near the resonating nuclei are dependent on the intra-and intermolecular effects. This determines the value of NMR spectroscopy to investigate the structure and behavior of many-electron (molecular) systems in different fields of science (Washburn and Birdwell, 2013;Nascimento, et al, 2004;Bayer, et al, 2010;Berman, et al, 2013;Charlier, et al, 2013;Kemalov, et al, 2012;Kruk et al, 2012, Twieg, 2013, Frantsuzov, 2010.…”