Universität zu Köln

Koch, Karin, Kundt, Matthias, Eremin, Alexey, Nadasi, Hajnalka ORCID: 0000-0001-5658-7080 and Schmidt, Annette M. (2020). Efficient ferronematic coupling with polymer-brush particles. Phys. Chem. Chem. Phys., 22 (4). S. 2087 - 2098. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 1463-9084

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Abstract

Switching of liquid crystal phases is of enormous technological importance and enables digital displays, thermometers and sensors. As an alternative to electric fields or temperature, magnetic fields are an interesting trigger, as they are on the one hand versatile to design, and on the other hand, they are compatible with a bouquet of applications. An interesting option to enable the magnetic switchability of nematic phases is by doping them with functional magnetic nanoparticles, but it remains a challenge to achieve well-compatibilized and stable ferronematic phases. Here, we report a new approach for the experimental realization of finely dispersed MNPs and nematic LC by creation of a surface-coupled mesogen-functionalized polymer brush, and the determination of their corresponding magneto-optical response. For this purpose, CoFe2O4 particles are equipped with a covalently attached polymeric shell carrying mesogenic groups and successfully dispersed in 4-pentyl-4 '-cyanobiphenyl (5CB) to form a stable ferronematic phase at ambient concentration up to similar to 1 vol%, as shown by DSC and Abbe refractometry. The magneto-optic response is detected in planar aligned LC cells. As compared to undoped 5CB, the hybrid system shows a significantly increased magnetic sensitivity, and the magneto-nematic surface anchoring is quantified by analysis of the magneto-nematic cross-correlation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Koch, Karin UNSPECIFIED UNSPECIFIED UNSPECIFIED Kundt, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Eremin, Alexey UNSPECIFIED UNSPECIFIED UNSPECIFIED Nadasi, Hajnalka UNSPECIFIED orcid.org/0000-0001-5658-7080 UNSPECIFIED Schmidt, Annette M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-348167
DOI:	10.1039/c9cp06245a
Journal or Publication Title:	Phys. Chem. Chem. Phys.
Volume:	22
Number:	4
Page Range:	S. 2087 - 2098
Date:	2020
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	1463-9084
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LIQUID-CRYSTAL; FERROMAGNETIC NANOPARTICLES; FREEDERICKSZ TRANSITION; SUSPENSIONS; 5CB; COLLOIDS Multiple languages Chemistry, Physical; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34816