Particle-Matrix interaction in cross-linked PAAm-Hydrogels analyzed by Mossbauer spectroscopy
| Autor: | Lisa Roeder, Soma Salamon, Heiko Wende, Joachim Landers, Annette M. Schmidt |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Range (particle radiation)
Chemistry Analytical chemistry Nanoparticle Hematite Physik (inkl. Astronomie) Atomic units Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy visual_art Mössbauer spectroscopy Self-healing hydrogels visual_art.visual_art_medium Particle Physical and Theoretical Chemistry Brownian motion |
| Popis: | The constrained motion of spindle-shaped hematite nanoparticles of about 400 nm in PAAm-hydrogels with different degrees of cross-link density is measured utilizing the line broadening observable in Mossbauer spectra at 265–293 K. A slight decrease of nanoparticle mobility is observed upon increasing cross-link density. Mossbauer spectra of the same nanoparticles in 60 wt % sucrose solution, used as reference material, display line broadening of the same magnitude as the hydrogel samples, indicating a similar degree of motion at the atomic scale and the time scale of the Mossbauer experiment. AC (alternating current) susceptibility data indicate that the magnetic relaxation of the nanoparticles in sucrose solution mainly occurs by Brownian motion, while the absence of magnetic loss within the investigated frequency range observed in measurements on hydrogel samples reveals very limited particle mobility. This apparent contradiction between results on particle dynamics in hydrogels by Mossbauer spectroscop... |
| Databáze: | OpenAIRE |
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