AI Article Synopsis
- Internal magnetic field gradients in porous media can reveal information about the behavior of liquid (like water) confined in those structures.
- A new theoretical approach combines spin interactions with radio-frequency fields and static magnetic fields to create a formula that aligns well with measurements of water diffusion in cement paste pores.
- Analyzing experimental data allows researchers to determine changes in capillary pore size, spin relaxation, and internal magnetic field variations during the early stages of hydration at varying temperatures.
Article Abstract
Internal magnetic field gradients, arising within the porous media due to susceptibility differences at the interfaces of solid and liquid as well as due to the contained magnetic impurities, can be employed by the method of modulated gradient spin echo to get insight into the velocity autocorrelation spectrum of liquid confined in the porous structure. New theoretical treatment of spin interaction with the radio-frequency field and the simultaneously applied static non-uniform magnetic field provides the formula that match well with the measurement of restricted diffusion of water in pores of cement paste. Its fitting to the experimental data gives the changes in the mean size of capillary pores, the spin relaxation and the magnitude of mean internal magnetic field gradients during the induction period and early acceleration stage of hydration processes at different temperatures.
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| http://dx.doi.org/10.1016/j.jmr.2016.09.013 | DOI Listing |
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