Two-dimensional correlation relaxometry studies of cement pastes performed using a new one-sided NMR magnet

McDonald, P.J.; Mitchell, Jonathan; Mulheron, M.; Aptaker, P.S.; Korb, Jean-Pierre; Monteilhet, L.

doi:10.1016/j.cemconres.2006.01.013

Cited by 67 publications

(57 citation statements)

References 18 publications

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“…The cross peaks would then have mapped the joint probability of molecules or spins being at site j at time t 0 þ t 1 þ t m $ t 0 þ t m and at site i at time t 0 þ t 1 $ t 0 . This joint probability density can be expressed in terms of the conditional 2) . This sequence is repeated varying p 2 between 1 and n, resulting in an n 2 time-domain matrix.…”

Section: Statistical Interpretation Of Peak Intensities In the Slow Ementioning

confidence: 99%

“…For the T 2 -T 2 exchange experiment schematized in Fig. 1, R stands for R (1) during t m and for R (2) during t 1 and t 2 .…”

Section: Statistical Interpretation Of Peak Intensities In the Slow Ementioning

confidence: 99%

“…Given a chosen set of K, R (2) , and R (1) matrices and an initial magnetization vector M(t 0 ), which typically is proportional to the population of sites, the magnetization vector M(t 1 þ t 0 ) is calculated according to Eq. [21] for each site i and at each time t 1 ¼ p 1 t ð1Þ E with p 1 varying between 1 and n: …”

Section: Numerical Simulationsmentioning

confidence: 99%

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Analysis of multisite 2D relaxation exchange NMR

Landeghem¹,

Haber²,

Lacaillerie³

et al. 2010

Concepts Magnetic Resonance

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Two-dimensional (2D) relaxation exchange nuclear magnetic resonance (NMR) is in many ways similar to 2D frequency exchange NMR, except that the encoding times are comparable to the exchange time. This fact prevents the straightforward analysis of the cross-peak intensities in terms of joint probability densities, and quantitative information and understanding can only be obtained by comparison with simulated spectra. Based on simulations, an explanation is proposed as to why interference between relaxation and exchange may lead to asymmetric 2D exchange maps when exchange occurs between more than two sites. Practically, retro-fitting a simulated data set to an experimental one is shown to allow for the determination of the experimental relaxation and exchange parameters. This point is illustrated by studying a two-site model system consisting of interstitial water exchanging within a pack of spherical silica particles.

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Section: Statistical Interpretation Of Peak Intensities In the Slow Ementioning

confidence: 99%

“…For the T 2 -T 2 exchange experiment schematized in Fig. 1, R stands for R (1) during t m and for R (2) during t 1 and t 2 .…”

Section: Statistical Interpretation Of Peak Intensities In the Slow Ementioning

confidence: 99%

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Analysis of multisite 2D relaxation exchange NMR

Landeghem¹,

Haber²,

Lacaillerie³

et al. 2010

Concepts Magnetic Resonance

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“…Beginning with early experiments and apparatus designed for nuclear magnetic resonance (NMR) well logging [1][2][3][4], there has been a continued interest in unilateral NMR (UMR) [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. UMR refers to NMR signal transduction, performed in such a way that the sample volume is external to the measurement apparatus and has the obvious advantage of allowing arbitrarily large samples to be investigated.…”

Section: Introductionmentioning

confidence: 99%

A compact permanent magnet array with a remote homogeneous field

Marble

Mastikhin

Colpitts

et al. 2007

Journal of Magnetic Resonance

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“…The recent progresses made in cement field were reviewed in the following articles [Nestle, 2007& Skibsted, 2008. Two-dimensional NMR relaxometry provides unique information on exchange of water between the silicate surface and the capillary pores [McDonald 2005[McDonald & 2007. Proton relaxation at the surface of hydrate is a probe (and noninvasive) for the determination of specific surface area of these hydrates and its evolution during the hydration [Zajac, 2007].…”

Section: Experimental Techniques To Characterize the Microstructure Dmentioning

confidence: 99%

Nano-optimized Construction Materials by Nano-seeding and Crystallization Control

Kutschera¹,

Nicoleau²,

Bräu³

2011

Nanotechnology in Civil Infrastructure

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Abstract. Nanotechnology and nanoscience are rapidly creating new possibilities to control and improve material properties. This trend can be also seen in construction materials used for civil infrastructure applications. Special focus in this area is put on Portland cement and gypsum. Together their annual production is by far larger than for any other material worldwide.Nano-engineering and nano-modification of these materials can be done between their dissolution and hardening. Especially the nucleation step and the crystallization period are most suitable to change the material properties by adding active supramolecular components or colloidal (particle) nano-seeding-additives. This chapter summarizes existing technologies for analyzing and changing the nano-structure of cement and gypsum construction materials. It also shows first results in homogeneous seeding the precipitation of calcium silicate hydrates within a real Portland cement composition. All these procedures, when done correctly, will result in improved material properties opening up with new possibilities for civil infrastructure applications.

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Two-dimensional correlation relaxometry studies of cement pastes performed using a new one-sided NMR magnet

Cited by 67 publications

References 18 publications

Analysis of multisite 2D relaxation exchange NMR

Analysis of multisite 2D relaxation exchange NMR

A compact permanent magnet array with a remote homogeneous field

Nano-optimized Construction Materials by Nano-seeding and Crystallization Control

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