TY  - JOUR
A1  - Flegler, Andreas
A1  - Schneider, Michael
A1  - Prieschl, Johannes
A1  - Stevens, Ralph
A1  - Vinnay, Thomas
A1  - Mandel, Karl
T1  - Continuous flow synthesis and cleaning of nano layered double hydroxides and the potential of the route to adjust round or platelet nanoparticle morphology
JF  - RSC Advances
N2  - Here, we report a continuous flow synthesis of nano LDH, comprising a continuous precipitation process using static mixers and followed by an immediate cleaning process via a semi-continuous centrifuge to obtain the final product in one-go. Via this synthesis setup, it is possible to independently vary the concentrations of the reactants during precipitation and at the same time ensure constant reaction conditions and an immediate "quenching" of the precipitate due to "on the flow"-washing. We found that this paves the way to adjust the synthesis parameters in a way that the final morphology of the nano-LDH particles can be controlled to be either round or platelet-like.
KW  - MgAl LDH
KW  - nano LDH
KW  - static mixer
KW  - synthesis process
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-191305
VL  - 6
IS  - 62
ER  - 
TY  - JOUR
A1  - Szczerba, Wojciech
A1  - Zukrowski, Jan
A1  - Przybylski, Marek
A1  - Sikora, Marcin
A1  - Safonova, Olga
A1  - Shmeliov, Aleksey
A1  - Nicolosi, Valeria
A1  - Schneider, Michael
A1  - Granath, Tim
A1  - Oppmann, Maximilian
A1  - Straßer, Marion
A1  - Mandel, Karl
T1  - Pushing up the magnetisation values for iron oxide nanoparticles via zinc doping: X-ray studies on the particle's sub-nano structure of different synthesis routes
JF  - Physical Chemistry Chemical Physics
N2  - The maximum magnetisation (saturation magnetisation) obtainable for iron oxide nanoparticles can be increased by doping the nanocrystals with non-magnetic elements such as zinc. Herein, we closely study how only slightly different synthesis approaches towards such doped nanoparticles strongly influence the resulting sub-nano/atomic structure. We compare two co-precipitation approaches, where we only vary the base (NaOH versus NH\(_3\)), and a thermal decomposition route. These methods are the most commonly applied ones for synthesising doped iron oxide nanoparticles. The measurable magnetisation change upon zinc doping is about the same for all systems. However, the sub-nano structure, which we studied with Mossbauer and X-ray absorption near edge spectroscopy, differs tremendously. We found evidence that a much more complex picture has to be drawn regarding what happens upon Zn doping compared to what textbooks tell us about the mechanism. Our work demonstrates that it is crucial to study the obtained structures very precisely when "playing'' with the atomic order in iron oxide nanocrystals.
KW  - Ferrite
KW  - FE
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-187390
VL  - 18
IS  - 36
ER  -