Molecular mobility and transport in polymer membranes and polyelectrolyte multilayers
2007 (English)In: Magnetic Resonance Imaging, ISSN 0730-725X, E-ISSN 1873-5894, Vol. 25, no 4, 541-543 p.Article in journal (Refereed) Published
Polyelectrolyte multilayers prepared by the layer-by-layer technique provide an efficient way to generate planar structures of tailored surface charge and hydrophobicity, which are used as membranes for pervaporation. The use of polyelectrolyte multilayers to form the membrane permits tailoring the surface charge of the membrane and, thus, selectivity; at the same time, it reduces fouling of the membrane by adsorption of organic matter. Pulsed field gradient (PFG) nuclear magnetic resonance has been used to investigate the diffusion of probe molecules into polymer systems. Evaluation of the apparent diffusion coefficient in porous poly(amide) results in a pore size of 4 mu m, as found in electron micrographs. For the pore size obtained for polyclectrolyte multilayers, no equivalent pores could be found in microscopy. Propagators for the diffusion of propanol and propanol-water mixture into multilayers reveal that there might be selective interaction of probe molecules with the polyelectrolyte system.
Place, publisher, year, edition, pages
2007. Vol. 25, no 4, 541-543 p.
PFG NMR, restricted diffusion, propagator, polyelectrolyte multilayers, membranes
Radiology, Nuclear Medicine and Medical Imaging
IdentifiersURN: urn:nbn:se:kth:diva-41127DOI: 10.1016/j.mri.2006.11.024ISI: 000246425100026PubMedID: 17466783ScopusID: 2-s2.0-34247516084OAI: oai:DiVA.org:kth-41127DiVA: diva2:443592
8th International Bologna Conferene on Magnetic Resonance in Porous Media Location: Univ Bologna, Phys Dept, Bologna, Italy, Date: SEP 10, 20062011-09-262011-09-232011-09-26Bibliographically approved