TY  - JOUR
A1  - Raju, Rajarshi Roy
A1  - Liebig, Ferenc
A1  - Hess, Andreas
A1  - Schlaad, Helmut
A1  - Koetz, Joachim
T1  - Temperature-triggered reversible breakdown of polymer-stabilized olive
BT  - silicone oil Janus emulsions
JF  - RSC Advances
N2  - A one-step moderate energy vibrational emulsification method was successfully employed to produce thermo-responsive olive/silicone-based Janus emulsions stabilized by poly(N,N-diethylacrylamide) carrying 0.7 mol% oleoyl side chains. Completely engulfed emulsion droplets remained stable at room temperature and could be destabilized on demand upon heating to the transition temperature of the polymeric stabilizer. Time-dependent light micrographs demonstrate the temperature-induced breakdown of the Janus droplets, which opens new aspects of application, for instance in biocatalysis.
KW  - microgels
KW  - step
Y1  - 2019
U6  - https://doi.org/10.1039/c9ra03463c
SN  - 2046-2069
VL  - 9
IS  - 35
SP  - 19271
EP  - 19277
PB  - RSC Publishing
CY  - London
ER  - 
TY  - GEN
A1  - Raju, Rajarshi Roy
A1  - Liebig, Ferenc
A1  - Hess, Andreas
A1  - Schlaad, Helmut
A1  - Koetz, Joachim
T1  - Temperature-triggered reversible breakdown of polymer-stabilized olive
BT  - silicone oil Janus emulsions
T2  - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe
N2  - A one-step moderate energy vibrational emulsification method was successfully employed to produce thermo-responsive olive/silicone-based Janus emulsions stabilized by poly(N,N-diethylacrylamide) carrying 0.7 mol% oleoyl side chains. Completely engulfed emulsion droplets remained stable at room temperature and could be destabilized on demand upon heating to the transition temperature of the polymeric stabilizer. Time-dependent light micrographs demonstrate the temperature-induced breakdown of the Janus droplets, which opens new aspects of application, for instance in biocatalysis.
T3  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 751 
KW  - microgels
KW  - step
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-436461
SN  - 1866-8372
IS  - 751
SP  - 19271
EP  - 19277
ER  - 
TY  - JOUR
A1  - Weis, Philipp
A1  - Hess, Andreas
A1  - Kircher, Gunnar
A1  - Huang, Shilin
A1  - Auernhammer, Günter K.
A1  - Koynov, Kaloian
A1  - Butt, Hans-Jürgen
A1  - Wu, Si
T1  - Effects of Spacers on Photoinduced Reversible Solid-to-Liquid Transitions of Azobenzene-Containing Polymers
JF  - Chemistry - a European journal
N2  - Photoisomerization in some azobenzene-containing polymers (azopolymers) results in reversible solid-to-liquid transitions because trans- and cis-azopolymers have different glass transition temperatures. This property enables photoinduced healing and processing of azopolymers with high spatiotemporal resolution. However, a general lack of knowledge about the influence of the polymer structure on photoinduced reversible solid-to-liquid transitions hinders the design of such novel polymers. Herein, the synthesis and photoresponsive behavior of new azopolymers with different lengths of spacers between the polymer backbone and the azobenzene group on the side chain are reported. Azopolymers with no and 20 methylene spacers did not show photoinduced solid-to-liquid transitions. Azopolymers with 6 or 12 methylene spacers showed photoinduced solid-to-liquid transitions. This study demonstrates that spacers are essential for azopolymers with photoinduced reversible solid-to-liquid transitions, and thus, gives an insight into how to design azopolymers for photoinduced healing and processing.
KW  - azobenzenes
KW  - isomerization
KW  - photochemistry
KW  - polymers
KW  - self-healing
Y1  - 2019
U6  - https://doi.org/10.1002/chem.201902273
SN  - 0947-6539
SN  - 1521-3765
VL  - 25
IS  - 46
SP  - 10946
EP  - 10953
PB  - Wiley-VCH
CY  - Weinheim
ER  -