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Subject: search.filters.subject.530Subject: search.filters.subject.540Institute: search.filters.UBSInstitut.Institut für Physikalische ChemieStart date: 2021End date: 2021

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    Micellar lyotropic gels : the interplay between gel network and liquid-crystalline order
    (2021) Dieterich, Sonja; Gießelmann, Frank (Prof. Dr.)
    Surfactant based lyotropic liquid-crystalline (LLC) gels in the sense that genuine micellar LLC phases are immobilized by an interpenetrating gel network were practically unknown until 2016. This “blind spot” in the landscape of anisotropic gels has now been filled to a certain extent by the results of this dissertation. Following the rational design strategy to gel surfactant based LLC phases with the help of low molecular mass gelators (LMWGs), not only lamellar and hexagonal LLC gels, but also the very first example of micellar nematic gels were obtained. Furthermore, this work has led to first important insights into how the self assembly of the gel is directed and how the gel network and the LLC phase mutually influence each other in terms of structure and morphology
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    ItemOpen Access
    Light- and magnetically actuated FePt microswimmers
    (2021) Kadiri, Vincent Mauricio; Günther, Jan-Philipp; Kottapalli, Sai Nikhilesh; Goyal, Rahul; Peter, Florian; Alarcón-Correa, Mariana; Son, Kwanghyo; Barad, Hannah-Noa; Börsch, Michael; Fischer, Peer
    Externally controlled microswimmers offer prospects for transport in biological research and medical applications. This requires biocompatibility of the swimmers and the possibility to tailor their propulsion mechanisms to the respective low Reynolds number environment. Here, we incorporate low amounts of the biocompatible alloy of iron and platinum (FePt) in its L10 phase in microstructures by a versatile one-step physical vapor deposition process. We show that the hard magnetic properties of L10 FePt are beneficial for the propulsion of helical micropropellers with rotating magnetic fields. Finally, we find that the FePt coatings are catalytically active and also make for Janus microswimmers that can be light-actuated and magnetically guided.