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Naturwissenschaftliche Fakultät II
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SFB/TTR 102
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SFB-Transregio 102

Polymers under multiple constraints: restricted and controlled molecular order and mobility


The SFB 102 is a long-term Transregional Collaborative Research Centre working on basic research.
Martin Luther University Halle-Wittenberg, as the coordinating University has applied together with the University of Leipzig for support of this research project. Both Universities are working close together to take advantage of this unique opportunity.

The SFB / TRR 102 is funded by the DFG.

1. Term funded: 01.07.2011 - 30.06.2015

2. Term funded: 01.07.2015 - 30.06.2019

3. Term funded: 01.07.2019 - 30.06.2023

Recent Scientific Highlights

Hydrodynamic Manipulation of Nano-Objects by Optically Induced Thermo-Osmotic Flows

The manipulation, control and transport of molecules and particles in  fluids is a key feature of microfluidics for all kinds of applications  ranging from macromolecule analysis to chemical synthesis. Fluids in  small channels are thereby driven by macroscopic pressure gradients,  surface acoustic waves or electro-osmotic flows.  We have developed a  method that generates strong currents in small liquid volumes by remote  heating of a thin metal film at a liquid-solid interface. The flows are  created by van der Waals forces between water and the metal, which also  facilitate nanoparticle trapping by interfacial forces. The dynamic  variation of the temperature fields enables the generation of complex  flow patterns that, together with other thermal effects also provides  new ways to handle peptides in protein aggregation studies.

Chiral amines as initiators for ROP and their chiral induction on poly(2-aminoisobutyric acid) chains

Chiral amines as initiators for ROP and their chiral induction on poly(2-aminoisobutyric acid) chains. (Reprinted from M. Rohmer et al., Polymer Chemistry (2021). Copyright 2021 Royal Society of Chemistry.)

Chiral amines as initiators for ROP and their chiral induction on poly(2-aminoisobutyric acid) chains. (Reprinted from M. Rohmer et al., Polymer Chemistry (2021). Copyright 2021 Royal Society of Chemistry.)

Chirality is a unique characteristic of living systems, as an example represented as either left- or right-handed helical conformations with an outstanding impact to self-assemble into higher-order structures. α-Aminoisobutyric acid (Aib) is an achiral amino acids and known for its helical building properties, leading to either left or right-handed helices in poly(peptides). We have prepared poly(Aib)s by ring opening polymerization and investigated their preference to organize into either left- or right-handed helices by choice of a chiral inductor, placed at the head of the polymer chain. By using chiral amines as initiators for the polymerization reaction, we are able to induce a chirality on the poly(Aib) chain and can select a certain handedness helix by the choice of the initiator. As a major finding we could prove that chirality is induced only by the sterical influence of the initiator, preferentially via hydrogen bonds. The here investigated system thus allows to amplify chirality by only minor amounts of a chiral inductor, being potentially useful for spin-selection, chemical reactions or the organization of the helices into superstructures.

Microscopic characterization of poly(sulfur nitride)

MMicroscopic characterization of poly(sulfur nitride). (E. Amado, N. Hasan et al., Macromol. Chem Phys. 222, 2100113 (2021). Copyright 2021 Wiley.)

MMicroscopic characterization of poly(sulfur nitride). (E. Amado, N. Hasan et al., Macromol. Chem Phys. 222, 2100113 (2021). Copyright 2021 Wiley.)

Poly(sulfur nitride) (SNx) is a unique synthetic polymer as it has the conductivity of metals at room temperature and is the only synthetic polymeric superconductor. In this work, bulk crystals as well as thin films of SNx have been synthesized and investigated. The bulk crystals consist of fibers, which show a microscopic macroscopic twinning. The crystallographic orientation in thin SNx-films was studied by Grazing Incidence Wide Angle X-ray Scattering (GI WAXS). Conductive Atomic Force Microscopy on thin films provides information on the electrical conductivity of SNx crystal together with its morphology in the nm range. The current-voltage (I-V) curves show ohmic behavior indicating the metallic nature of SNx.

More selected publications

For more highlights of the CRC please check here.

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