Time-Dependent Diffusion Studies on Miglyol Molecules Confined in Permeable Polymeric Capsules

. Time-dependent diffusion studies have been done on miglyol molecules confined in ε-caprolactone polymeric capsules prepared by an emulsification–diffusion technique. The nuclear magnetic resonance diffusometry technique implemented in our investigations is the so-called fringe field stimulated ech...

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Bibliographic Details
Published in:Applied magnetic resonance 2008-07, Vol.34 (1-2), p.63-69
Main Authors: Bogdan, M., Parnau, A., Badea, C., Ardelean, I.
Format: Article
Language:English
Subjects:
Atoms and Molecules in Strong Fields
Diffusion coefficient
Eddy currents
Electron micrographs
Laser Matter Interaction
NMR
Nuclear magnetic resonance
Organic Chemistry
Physical Chemistry
Physics
Physics and Astronomy
Solid State Physics
Spectroscopy/Spectrometry
Time dependence
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Summary:. Time-dependent diffusion studies have been done on miglyol molecules confined in ε-caprolactone polymeric capsules prepared by an emulsification–diffusion technique. The nuclear magnetic resonance diffusometry technique implemented in our investigations is the so-called fringe field stimulated echo (FFStE) technique. With FFStE technique, high gradients are available (22 T/m in our experiments) which allow the measurements of the apparent diffusion coefficient for diffusion times between 1 and 300 ms. No internal gradient effects or eddy current effects are to be expected in our measurements. The experimental data have been compared with the theoretical dependence in the short-time limit which allowed us to extract the capsule dimensions. The coincidence with the dimension observed from an electron micrograph is remarkable.
ISSN:0937-9347
1613-7507
DOI:10.1007/s00723-008-0089-5