Literatur vom gleichen Autor/der gleichen Autor*in
plus bei Google Scholar

Bibliografische Daten exportieren
 

Magneto-responsive hydrogels based on maghemite/triblock terpolymer hybrid micelles

Titelangaben

Reinicke, Stefan ; Döhler, Stefan ; Tea, Sandrine ; Krekhova, Marina ; Messing, Renate ; Schmidt, Annette M. ; Schmalz, Holger:
Magneto-responsive hydrogels based on maghemite/triblock terpolymer hybrid micelles.
In: Soft Matter. Bd. 6 (2010) Heft 12 . - S. 2760-2773.
ISSN 1744-6848
DOI: https://doi.org/10.1039/c000943a

Volltext

Link zum Volltext (externe URL): Volltext

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

We report on a new approach towards magneto-responsive hydrogels, showing a reversible gelation upon inductive heating via AC magnetic fields. An aqueous solution of a triblock terpolymer with a partially quaternized poly(2-vinylpyridine) (Pq2VP) outer block, a water soluble poly(ethylene oxide) (PEO) middle block and a thermo-sensitive poly(glycidyl methyl ether-co-ethyl glycidyl ether) (P(GME-co-EGE)) end block (Pq2VP-b-PEO-b-P(GME-co-EGE)) was mixed with a solution of sodium citrate stabilized superparamagnetic maghemite nanoparticles. Due to electrostatic interactions between the oppositely charged particles, surface and the Pq2VP block of the triblock terpolymer, well-defined hybrid micelles with a superparamagnetic core were formed. The number of triblock terpolymer chains stabilizing the nanoparticles was found to be constant above a critical triblock terpolymer/maghemite ratio, i.e. for higher polymer contents hybrid micelles and free (non-bound) triblock terpolymers are present in solution. Thermo-reversible hydrogels are formed via an open association of hybrid micelles at temperatures above the cloud point of the P(GME-co-EGE) corona blocks, which form the network junctions. The superparamagnetic character of the maghemite nanoparticles enables contactless heating, and thus gelation, by applying AC magnetic fields, as demonstrated by high frequency magnetocalorimetry. The thermo-reversible gelation and the dynamic-mechanical properties of the hydrogels were studied by rheology.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: TRANSFER RADICAL POLYMERIZATION; CORE-SHELL NANOPARTICLES; AMPHIPHILIC BLOCK-COPOLYMERS; ONE-POT SYNTHESIS; DIBLOCK COPOLYMER; FE3O4 NANOPARTICLES; CONTROLLED-RELEASE; AQUEOUS-SOLUTIONS; CONTRAST AGENTS; CUBIC PHASES
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II > Lehrstuhl Makromolekulare Chemie II - Univ.-Prof. Dr. Andreas Greiner
Profilfelder > Advanced Fields > Polymer- und Kolloidforschung
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
Profilfelder
Profilfelder > Advanced Fields
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Eingestellt am: 14 Apr 2015 07:31
Letzte Änderung: 21 Jul 2023 06:54
URI: https://eref.uni-bayreuth.de/id/eprint/10078