TY  - GEN
A1  - Schimka, Selina
A1  - Lomadze, Nino
A1  - Rabe, Maren
A1  - Kopyshev, Alexey
A1  - Lehmann, Maren
A1  - von Klitzing, Regine
A1  - Rumyantsev, Artem M.
A1  - Kramarenko, Elena Yu.
A1  - Santer, Svetlana
T1  - Photosensitive microgels containing azobenzene surfactants of different charges
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - We report on light sensitive microgel particles that can change their volume reversibly in response to illumination with light of different wavelengths. To make the anionic microgels photosensitive we add surfactants with a positively charged polyamine head group and an azobenzene containing tail. Upon illumination, azobenzene undergoes a reversible photo-isomerization reaction from a trans- to a cis-state accompanied by a change in the hydrophobicity of the surfactant. Depending on the isomerization state, the surfactant molecules are either accommodated within the microgel (trans-state) resulting in its shrinkage or desorbed back into water (cis-isomer) letting the microgel swell. We have studied three surfactants differing in the number of amino groups, so that the number of charges of the surfactant head varies between 1 and 3. We have found experimentally and theoretically that the surfactant concentration needed for microgel compaction increases with decreasing number of charges of the head group. Utilization of polyamine azobenzene containing surfactants for the light triggered remote control of the microgel size opens up a possibility for applications of light responsive microgels as drug carriers in biology and medicine.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 461 
KW  - ph-responsive microgels
KW  - co-monomer content
KW  - drug-delivery
KW  - photoresponsive surfactants
KW  - metal nanoparticles
KW  - swelling behavior
KW  - temperature
KW  - particles
KW  - collapse
KW  - hydrogels
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-413528
SN  - 1866-8372
IS  - 461
ER  - 
TY  - GEN
A1  - Thete, Aniket
A1  - Rojas, Oscar
A1  - Neumeyer, David
A1  - Koetz, Joachim
A1  - Dujardin, Erik
T1  - Ionic liquid-assisted morphosynthesis of gold nanorods using polyethyleneimine-capped seeds
N2  - Seed-mediated gold nanorods with tunable lengths are prepared using new polyethyleneimine-capped gold nanoparticles synthesized in ionic liquid. The effect of polyethyleneimine and ionic liquid during nanorod growth is investigated and shows a marked effect on their final aspect ratio.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 245 
KW  - aqueous-solution
KW  - aspect-ratio
KW  - cationic surfactants
KW  - chemical-synthesis
KW  - delivery
KW  - metal nanoparticles
KW  - mixtures
KW  - shape
KW  - silver nanowires
KW  - surface-plasmon resonance
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-95196
SP  - 14294
EP  - 14298
ER  -