National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Investigation of matter transport in porous materials by means of PFG NMR
Peksa, Mikuláš ; Lang, Jan (advisor) ; Hof, Martin (referee)
Title: Investigation of matter transport by means of PFG NMR Author: Mikuláš Peksa Department of low temperature physics Supervisor: doc. RNDr. Jan Lang, Ph.D. Assistant Supervisor: RNDr. Milan Kočiřík, CSc. (ÚFCH JH AV ČR) Abstract: Estimation of transport-structural parameters such as porosity, tortuosity and surface-to-volume ratio of pores in beds of glass beads is the main goal of this study. These parameters were estimated for 5 samples with different distributions of sizes. The second goal is to probe a possibility to use the same approach to describe the self-diffusion in water solution of LiCl confined in two porous materials based on Al2O3 and glass, respectively. The last goal is the measurement of self-diffusion of water molecules in mesoporous geopolymeric material. Its capability of water transport at long scales have been documented. The measurements of apparent self-diffusion coefficients by means of NMR spectroscopy with pulsed field gradients was major methodology of this work. Keywords: porous material, porosity, tortuosity, self-diffusion, NMR
Grain boundary self-diffusion in nickel: Comparison of theoretical and experimental diffusivities
Rothová, Věra ; Svoboda, Milan ; Buršík, Jiří
An extremely wide spectrum of the experimental results of the grain boundary self-diffusivities in nickel was published in the literature. By using two approaches based on the empirical correlations and rules, the purpose of this study is to theoretically estimate the grain boundary (GB) self-diffusivities in nickel. The obtained dependences are compared with one another as well as with the literature experimental data.

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