Surface magnetic relaxation in cement pastes

Mendelson, Kenneth S.; Halperin, W. P.; Jehng, Jyh Yuar; Song, Yi‐Qiao

doi:10.1016/0730-725x(94)91517-2

Cited by 21 publications

(8 citation statements)

References 4 publications

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“…The monotonic increase in T 1 with cooling is expected given the thermally activated process driving the surface relaxation, T 1 α exp(−E a /kT ) with E a = 0.11 eV (Blinc et al 1988, Mendelson et al 1994. Computation of this effect results in a factor of 2.6 increase in T 1 when freezing from T -T 0 = 10 to −40 K, in agreement with the T1 measured values.…”

Section: T 1 Mappingsupporting

confidence: 83%

“…Computation of this effect results in a factor of 2.6 increase in T 1 when freezing from T -T 0 = 10 to −40 K, in agreement with the T1 measured values. When additional desorption due to the vapour pressure conditions in the pore system is triggered at around T -T 0 = −40 K, a more pronounced T 1 increase during freezing is observed (Mendelson et al 1994). This secondary phase transition also results in a slight decrease in the α parameter between T -T 0 = −40 and −45 K. It should be noted that short spin-lattice relaxation times allow for faster pulse sequence repetition.…”

Section: T 1 Mappingmentioning

confidence: 99%

See 1 more Smart Citation

Spatially resolved relaxometry and pore size distribution by single-point MRI methods: porous media calorimetry

Prado

Balcom

Beyea

et al. 1998

J. Phys. D: Appl. Phys.

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A single-point magnetic resonance imaging study of water freezing in saturated and non-saturated porous materials is presented. Relevant considerations about relaxation time mapping in short relaxation time systems ( of tens to hundreds of microseconds) are discussed and results in concrete and mortar samples under cooling conditions are shown. A spatially resolved estimation of the occupied pore size distribution is achieved in specimens presenting short relaxation times. To the best of our knowledge, this is the first report on the effective determination of spatially resolved pore size distribution of intact concrete materials. Evolution of one-dimensional images as a function of temperature is qualitatively compared with a series of differential scanning calorimetry experiments for cement pastes conditioned under controlled humidity. No supercooling effect is observed in a water saturated concrete single-point imaging experiment.

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Section: T 1 Mappingsupporting

confidence: 83%

Section: T 1 Mappingmentioning

confidence: 99%

Spatially resolved relaxometry and pore size distribution by single-point MRI methods: porous media calorimetry

Prado

Balcom

Beyea

et al. 1998

J. Phys. D: Appl. Phys.

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“…Therefore we can rewrite the requirement for the perfectly reflecting wall approximation, Ma/D Ӷ 1, as M⌬/a Ӷ 1. Hence, in systems with smaller pores or slower diffusing fluids, or in materials, such as rocks (24) and cement pastes (25), where the mineralogy can significantly increase the surface relaxation, the effect cannot necessarily be ignored. Hence, it is useful to have an understanding of the effect and significance of the fluid-surface interaction on the q-space data.…”

Section: Effect Of Wall Relaxationmentioning

confidence: 98%

Spin Echo Analysis of Restricted Diffusion under Generalized Gradient Waveforms: Planar, Cylindrical, and Spherical Pores with Wall Relaxivity

Codd

Callaghan

1999

Journal of Magnetic Resonance

101

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“…For protons of liquid confined in the pore space of materials, a relaxation rate is increased one in comparison with rate in bulk solution (Peemoeller et al 1981;D'Orazio et al 1990;Henkelman et al 1994;Takamiya et al 2000;Callaghan 2011;Rodin et al 2004bRodin et al , 2013Rodin 2017Rodin , 2018c. In order to consider the interactions at the liquid-solid interface and to use theoretical models for some applications, it is necessary to assume the short-range surface interactions and a fast exchange of molecules between the bulk fraction and the liquid on the surface (Mendelson et al 1994;Gran and Hansent 1998;Song et al 2008;Takemura et al 2012;Palmer 2014;Rodin 2018c). In such a case, there will be averaging between different environments.…”

Section: Nmr (T 1 and T 2 ) Relaxation Times And Model Approachesmentioning

confidence: 99%

NMR techniques in studying water in biotechnological systems

Rodin

2020

Biophys Rev

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Different NMR methodologies have been considered in studying water as a part of the structure of heterogeneous biosystems. The current work mostly describes NMR techniques to investigate slow translational dynamics of molecules affecting anisotropic properties of polymers and biomaterials. With these approaches, information about organized structures and their stability could be obtained in conditions when external factors affect biomolecules. Such changes might include rearrangement of macromolecular conformations at fabrication of nano-scaffolds for tissue engineering applications. The changes in water-fiber interactions could be mirrored by the magnetic resonance methods in various relaxations, double-quantum filtered (DQF), 1D and 2D translational diffusion experiments. These findings effectively demonstrate the current state of NMR studies in applying these experiments to the various systems with the anisotropic properties. For fibrous materials, it is shown how NMR correlation experiments with two gradients (orthogonal or collinear) encode diffusion coefficients in anisotropic materials and how to estimate the permeability of cell walls. It is considered how the DQF NMR technique discovers anisotropic water in natural polymers with various cross-links. The findings clarify hydration sites, dynamic properties, and binding of macromolecules discovering the role of specific states in improving scaffold characteristics in tissue engineering processes. Showing the results in developing these NMR tools, this review focuses on the ways of extracting information about biophysical properties of biomaterials from the NMR data obtained.

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Surface magnetic relaxation in cement pastes

Cited by 21 publications

References 4 publications

Spatially resolved relaxometry and pore size distribution by single-point MRI methods: porous media calorimetry

Spatially resolved relaxometry and pore size distribution by single-point MRI methods: porous media calorimetry

Spin Echo Analysis of Restricted Diffusion under Generalized Gradient Waveforms: Planar, Cylindrical, and Spherical Pores with Wall Relaxivity

NMR techniques in studying water in biotechnological systems

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