<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>H NMR at Larmor frequencies down to 3 Hz by means of Field-Cycling techniques

Kresse, B.; Becher, Manuel; Privalov, A. F.; Hofmann, M.; Rössler, E. A.; Vogel, Michael; Fujara, F.

doi:10.1016/j.jmr.2017.02.002

Cited by 32 publications

(18 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Important new developments have been proposed for extending the NMRD data to very high field (14 T) allowing a better characterization of the contrast agents at relevant magnetic fields for clinical and preclinical MRI [11]. Recently, some FFC proton NMR has been carried out at a 1 H frequency down to about 3 Hz which has allowed exploration of about six decades in frequencies within a single NMRD profile [181]. All the examples shown in this review show that FFC NMR relaxation technique, as well as NMR and ESR spectroscopies, have proven useful for characterizing the multiscale dynamics of complex liquids in bulk and confinement environments.…”

Section: Resultsmentioning

confidence: 99%

Multiscale nuclear magnetic relaxation dispersion of complex liquids in bulk and confinement

Korb

2018

Progress in Nuclear Magnetic Resonance Spectroscopy

144

166

View full text Add to dashboard Cite

The nuclear magnetic relaxation dispersion (NMRD) technique consists of measurement of the magnetic-field dependence of the longitudinal nuclear-spin-lattice relaxation rate 1/T. Usually, the acquisition of the NMRD profiles is made using a fast field cycling (FFC) NMR technique that varies the magnetic field and explores a very large range of Larmor frequencies (10 kHz < ω/(2π) <40 MHz). This allows extensive explorations of the fluctuations to which nuclear spin relaxation is sensitive. The FFC technique thus offers opportunities on multiple scales of both time and distance for characterizing the molecular dynamics and transport properties of complex liquids in bulk or embedded in confined environments. This review presents the principles, theories and applications of NMRD for characterizing fundamental properties such as surface correlation times, diffusion coefficients and dynamical surface affinity (NMR wettability) for various confined liquids. The basic longitudinal and transverse relaxation equations are outlined for bulk liquids. The nuclear relaxation of a liquid confined in pores is considered in detail in order to find the biphasic fast exchange relations for a liquid at proximity of a solid surface. The physical-chemistry of liquids at solid surfaces induces striking differences between NMRD profiles of aprotic and protic (water) liquids embedded in calibrated porous disordered materials. A particular emphasis of this review concerns the extension of FFC NMR relaxation to industrial applications. For instance, it is shown that the FFC technique is sufficiently rapid for following the progressive setting of cement-based materials (plasters, cement pastes, concretes). The technique also allows studies of the dynamics of hydrocarbons in proximity of asphaltene nano-aggregates and macro-aggregates in heavy crude oils as a function of the concentration of asphaltenes. It also gives new information on the wettability of petroleum fluids (brine and oil) embedded in shale oil rocks. It is useful for understanding the relations and correlations between NMR relaxation times T and T, diffusion coefficients D, and viscosity η of heavy crude oils. This is of particular importance for interpreting T, T, 2D T-T and D-T correlation spectra that could be obtained down-hole, thus giving a valuable tool for investigating in situ the molecular dynamics of petroleum fluids. Another domain of interest concerns biological applications. This is of particular importance for studying the complex dynamical spectrum of a folded polymeric structure that may span many decades in frequency or time. A direct NMRD characterization of water diffusional dynamics is presented at the protein interface. NMR experiments using a shuttle technique give results well above the frequency range accessible via the FFC technique; examples of this show protein dynamics over a range from fast and localized motions to slow and delocalized collective motions involving the whole protein. This review ends by an interpretation of the origin of the proto...

show abstract

Section: Resultsmentioning

confidence: 99%

Multiscale nuclear magnetic relaxation dispersion of complex liquids in bulk and confinement

Korb

2018

Progress in Nuclear Magnetic Resonance Spectroscopy

144

166

View full text Add to dashboard Cite

show abstract

“…We had additionally access to a home‐built relaxometer at the Institute of Solid State Physics of the University of Darmstadt. With that advanced instrument, frequencies down to about 100 Hz are now reached routinely . In the present contribution, we first demonstrate the relevance of intermolecular relaxation at low frequencies; then we will exploit this to determine the translational diffusion coefficient in liquids, polymer melts, and ionic liquids.…”

Section: Applicationsmentioning

confidence: 89%

“…In this case, the ultimate relaxation determined by Fickian diffusion of the polymer segment is not reached due to the large separation of segmental and terminal relaxation in a high‐ M polymer. The high temperature data shown in Figure were recorded with the home‐built relaxometer in Darmstadt, which was equipped with earth field shielding. Thereby, we could extend the frequency range by about two decades toward low frequencies (cf.…”

Section: Applicationsmentioning

confidence: 99%

“…With the availability of a commercial electronic FC relaxometer since 1997, NMR relaxometry received new momentum, as it is now routinely possible to measure R 1 ( ω ) in a frequency range of 10 kHz<ω/(2π)<30 MHz ( 1 H). Taking recourse to home‐built instruments and compensating for the earth field, frequencies down to 100 Hz and recently even down to 3 Hz are accessible …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of proton field‐cyclingNMRrelaxometry for studying translational diffusion in simple liquids and polymer melts

Flämig

Hofmann

Lichtinger

et al. 2019

Magnetic Reson in Chemistry

View full text Add to dashboard Cite

show abstract

“…1 H relaxation originates from fluctuations of dipole-dipole interactions between proton pairs due to polymer motions. With commercial FFC relaxometers the frequency range from 0.01 to 40 MHz is covered, this range being further extendable to lower frequencies with home-made relaxometers 22 and to higher frequencies with high field superconducting spectrometers.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of poly(vinyl butyral) studied using dielectric spectroscopy and ¹H NMR relaxometry

Pizzanelli

Prevosto

Labardi

et al. 2017

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Dielectric Spectroscopy (DS) and H Fast Field-Cycling (FFC) NMR relaxometry were applied for understanding the dynamic behavior of the amorphous ter-polymer poly(vinyl butyral) (PVB) across the glass transition temperature (T = 70 °C by Differential Scanning Calorimetry). Above T, main chain segmental motions (α relaxation) were detected and characterized using both DS and FFC NMR relaxometry. The correlation times extracted by the analysis of DS and FFC NMR relaxometry data agreed within a factor of three and showed a Vogel-Fulcher-Tammann temperature dependence, with an associated T of 69 °C and a fragility of 155 for PVB glass. Below T, a secondary process (β relaxation) was revealed by DS, and was ascribed to reorientations of the vinyl alcohol dipoles due to local twisting motions with an associated activation barrier of 11 kcal mol. The β process was also found to contribute to H NMR relaxation above T.

show abstract

1H NMR at Larmor frequencies down to 3 Hz by means of Field-Cycling techniques

Cited by 32 publications

References 22 publications

Multiscale nuclear magnetic relaxation dispersion of complex liquids in bulk and confinement

Multiscale nuclear magnetic relaxation dispersion of complex liquids in bulk and confinement

Application of proton field‐cyclingNMRrelaxometry for studying translational diffusion in simple liquids and polymer melts

Dynamics of poly(vinyl butyral) studied using dielectric spectroscopy and ¹H NMR relaxometry

Contact Info

Product

Resources

About

1H NMR at Larmor frequencies down to 3 Hz by means of Field-Cycling techniques

Cited by 32 publications

References 22 publications

Multiscale nuclear magnetic relaxation dispersion of complex liquids in bulk and confinement

Multiscale nuclear magnetic relaxation dispersion of complex liquids in bulk and confinement

Application of proton field‐cyclingNMRrelaxometry for studying translational diffusion in simple liquids and polymer melts

Dynamics of poly(vinyl butyral) studied using dielectric spectroscopy and 1H NMR relaxometry

Contact Info

Product

Resources

About

Dynamics of poly(vinyl butyral) studied using dielectric spectroscopy and ¹H NMR relaxometry