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Title: | Deswelling of Poly(N-isopropylacrylamide) derived hydrogels and their nanocomposites with iron oxide nanoparticles as revealed by X-ray photon correlation spectroscopy |
Authors: | Hernández, Rebeca ![]() ![]() ![]() ![]() |
Issue Date: | 2015 |
Publisher: | American Chemical Society |
Citation: | Macromolecules 48: 393-399 (2015) |
Abstract: | 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) |
URI: | http://hdl.handle.net/10261/111479 |
DOI: | http://dx.doi.org/10.1021/ma502118a |
Identifiers: | doi: 10.1021/ma502118a issn: 0024-9297 e-issn: 1520-5835 |
Appears in Collections: | (ICTP) Artículos (CFMAC-IEM) Artículos |
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