Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Focus: Functional Polymer Hybrids I
CPP 20.3: Vortrag
Dienstag, 8. März 2016, 10:15–10:30, H51
Optically controlled shape of soft nano-objects — •Selina Schimka1,2 and Svetlana Santer1 — 1University of Potsdam, 14476 Potsdam, Germany — 2Max Plank Institute of Colloids and Interfaces, 14424 Potsdam, Germany
What have acid-group containing microgels and DNA in common?
Right, both of them are negatively charged polymers, drawing attention of research because of possible applications in biological and biomedical application.
But beside this, both are soft nano-objects, that can be reversibly and non-invasively changed in their shape by light, with assistance of an azobenzene containing agent [1,2]. Althought the mechanisms behind this process differs if microgel or DNA is used, and apparently even with the used azobenzene containing agent, the effect is quite similar - from a widely expanded state (swollen microgel or decompacted for DNA) with a high water content, they undergo a transition to a compacter, smaller state (shrunken microgel or compacted DNA), and back to the expanded state, depending on the illumination conditions.
This behavior is in any case related to the trans cis isomerization of the azobenzene containing agent, which can be switched between a hydrophilic trans (visible light) and a hydrophobic cis (UV light) state, which alters its interaction with the microgel/DNA.
Regarding previous works, we consider questions of toxicity and systematic behavior by the help of a set of new azobenzene containing agents.
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Y. Zakrevskyy, Adv Funct Mater 2012, 22, 5000.