Universität zu Köln

Backes, Sebastian, Witt, Marcus U., Roeben, Eric, Kuhrts, Lucas, Aleed, Sarah, Schmidt, Annette M. and von Klitzing, Regine ORCID: 0000-0003-0555-5104 (2015). Loading of PNIPAM Based Microgels with CoFe2O4 Nanoparticles and Their Magnetic Response in Bulk and at Surfaces. J. Phys. Chem. B, 119 (36). S. 12129 - 12138. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-6106

Full text not available from this repository.

Abstract

The present paper addresses the loading of thermoresponsive poly-N-isopropylacrylamide (PNIPAM) based microgel particles with magnetic nanoparticles (MNP: CoFe2O4@PAA (PAA = poly(acrylic acid))) and their response to an external magnetic field. The MNP uptake is analyzed by transmission electron microscopy (TEM). Obviously, the charge combination of MNP and microgels plays an important role for the MNP uptake, but it does not explain the whole uptake process. The MNP uptake results in changes of size and electrophoretic mobility, which is investigated by dynamic light scattering (DLS) and a Zetasizer. The microgels loaded with MNP preserve their thermosensitivity, and they show magnetic separability and are considered as magnetic microgels. After adsorption at a surface the magnetic microgels are studied with a scanning force microscope and indentation experiments. The magnetic microgels show an elongation along the magnetic field parallel to the surface while the height of the microgels (perpendicular to the surface and to the magnetic field) is compressed. This result is in good agreement with simulations of volume change of ferrogels in a magnetic field.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Backes, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Witt, Marcus U. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roeben, Eric UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuhrts, Lucas UNSPECIFIED UNSPECIFIED UNSPECIFIED Aleed, Sarah UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmidt, Annette M. UNSPECIFIED UNSPECIFIED UNSPECIFIED von Klitzing, Regine UNSPECIFIED orcid.org/0000-0003-0555-5104 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-393092
DOI:	10.1021/acs.jpcb.5b03778
Journal or Publication Title:	J. Phys. Chem. B
Volume:	119
Number:	36
Page Range:	S. 12129 - 12138
Date:	2015
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1520-6106
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COMPOSITE MICROSPHERES; HYBRID MICROGELS; IONIC-STRENGTH; GOLD NANORODS; TEMPERATURE; PH; SHELL; PARTICLES; BEHAVIOR; SUSPENSIONS Multiple languages Chemistry, Physical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39309