Deswelling of Poly(N-isopropylacrylamide) derived hydrogels and their nanocomposites with iron oxide nanoparticles as revealed by X-ray photon correlation spectroscopy
Here we present results on the deswelling behavior of semi-interpenetrating polymer hydrogels of sodium alginate and poly(N-isopropylacrylamide) (PNI-PAAm) containing iron oxide nanoparticles by means of Xray photon correlation spectroscopy (XPCS). The experiments were carried out as a function of t...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/111479 |
| Acceso en línea: | http://hdl.handle.net/10261/111479 |
| Access Level: | acceso abierto |
| Palabra clave: | ddc:540 |
| Sumario: | Here we present results on the deswelling behavior of semi-interpenetrating polymer hydrogels of sodium alginate and poly(N-isopropylacrylamide) (PNI-PAAm) containing iron oxide nanoparticles by means of Xray photon correlation spectroscopy (XPCS). The experiments were carried out as a function of temperature starting from temperatures below the low critical solution temperature (LCST) of the materials to temperatures above their LCST. The hydrogels present a hyper-diffusive dynamics of similar nature as that found for the freeze-dried aerogels which has been attributed to their characteristic porous structure. The dynamics of the swollen samples is faster than that of the freeze-dried ones suggesting that water has an effect in accelerating the dynamics of the hydrogels. XPCS has been used to characterize the deswelling process as a function of temperature. Deswelling times for the different samples correlate well with the corresponding relaxation times of the relaxation processes measured by XPCS. (Graph Presented) |
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