Universität zu Köln

Landers, Joachim, Roeder, Lisa, Salamon, Soma, Schmidt, Annette M. and Wende, Heiko ORCID: 0000-0001-8395-3541 (2015). Particle-Matrix Interaction in Cross-Linked PAAm-Hydrogels Analyzed by Mossbauer Spectroscopy. J. Phys. Chem. C, 119 (35). S. 20642 - 20649. WASHINGTON: AMER CHEMICAL SOC. ISSN 1932-7447

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Abstract

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 spectroscopy and AC susceptibility measurements is explained in terms of constrained particle mobility at atomic scales.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Landers, Joachim UNSPECIFIED UNSPECIFIED UNSPECIFIED Roeder, Lisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Salamon, Soma UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmidt, Annette M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wende, Heiko UNSPECIFIED orcid.org/0000-0001-8395-3541 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-393188
DOI:	10.1021/acs.jpcc.5b03697
Journal or Publication Title:	J. Phys. Chem. C
Volume:	119
Number:	35
Page Range:	S. 20642 - 20649
Date:	2015
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1932-7447
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SYMMETRIC TOP MACROMOLECULES; CIRCULAR-CYLINDERS; PROTEIN DYNAMICS; BROWNIAN-MOTION; COBALT FERRITE; DIFFUSION; HEMATITE; NANOPARTICLES; NANORHEOLOGY Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39318