Tracer mobility in aqueous poly (N-isopropyl-acrylamide) grafted networks: effect of interactions and permanent crosslinks

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F13%3A10292502" target="_blank" >RIV/00216208:11310/13:10292502 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Tracer mobility in aqueous poly (N-isopropyl-acrylamide) grafted networks: effect of interactions and permanent crosslinks
Original language description
Using fluorescence correlation spectroscopy, we measured the translational mobility of three molecular tracers in aqueous poly(N-isopropylacrylamide) (PNIPAAm) grafted networks, under good solvency conditions. The influence of permanent crosslinks and the interaction between polymer and tracers was revealed. In contrast to the athermal tracer Alexa 647, we observed strong deviation from single Fickian diffusion for two interacting tracers, Alexa 488 and Rhodamine 6G. The dynamics of the latter tracers were represented by a double Fickian diffusion in PNIPAAm solutions and hydrogels for volume fractions up to 30 %. A different slowdown was observed for the slow process in hydrogels and solutions. For the hydrogels, it becomes virtually concentration independent above about 10 %, whereas for solutions it increases below this threshold with PNIPAAm concentration. A pure crowding effect, free of interactions, was observed for both Alexa 647 and for the fast diffusion process of the interac
Czech name
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Czech description
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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