14.10.2014

17.00 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Kaustubh R. Mote

TIFR Center for Interdisciplinary Sciences, 21 Brundavan Colony, Narsinghi, Hyderabad 500075, India

"Understanding amyloid-β aggregation and toxicity by NMR spectroscopy"

Abstract:
The  aggregation and membrane association of amyloid- peptides is  correlated with their toxicity to living cells. This is believed to be  directly responsible for the progression of neurodegenerative diseases  such as the Alzheimer’s disease. However, the presence of a number of  intermediate species along the aggregation pathway makes it difficult  correlate the toxicity to a specific structure....

Details
Mote_PSM_141092014.pdf (194,3 KB)  vom 01.10.2014

24.09.2014 Sondertermin

15.00 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Toshikazu Miyoshi

Department of Polymer Science, The University of Akron, Akron, OH 44325, United State

"Chain-Folding Structure, Molecular Dimension, Structural Disorder, and Molecular Dynamics of Semi-crystalline Polymers as Elucidated by Solid-State NMR"

Abstract:
Semi-crystalline polymers are crystallized as folded chain structures in thin lamellae to form single plate/scrolled crystals in dilute solution and bilayer structures consisting of crystalline and amorphous regions in the bulk. Several advanced characterization tools have challenged understanding of polymer structures at different length scales.....

Details
Miyoshi_PSM_24092014.pdf (144 KB)  vom 09.09.2014

07.08.2014 Sondertermin

15.00 Uhr im Seminarraum des Fraunhofer IWM, Walter-Hülse-Str.1, Halle

Jimmy W. Mays1,2 and Samuel P. Gido3

1. Department of Chemistry University of Tennessee at Knoxville

2. Oakridge National Laboratory,Oakridge, Tennessee

3. Polymer Science and Engineering University  of Massachusetts Amherst

"Control of Block Copolymer Morphology and Properties Through Molecular Architecture Variation"

Abstract:
Currently, there is tremendous interest in using the self-assembling properties of block copolymers as a route to nanostructures of controlled size, shape and long range order. We have been exploring the influence of branched block copolymer architecture on the morphologies, including: microphase separated domain shape, defect formation and long range order....

Details
Mays_Gido_07_08_14_Special_event_SFB.pdf (107 KB)  vom 04.08.2014

01.07.2014

17.15 Uhr im Hörsaal 1.26 (VSP 1)

Prof. Jinfeng Dong

College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China

"Multiple stimuli responsive novel surfactant systems: molecular design, synthesis and characterization"

Abstract:
Surfactant systems have the ability to sense and respond to the polarity of surface/interface and adsorb or aggregate into self-assembly structures, namely micelles, vesicles and liquid crystals. There are a few surfactants which can respond to external stimuli or changes in the environment by readjusting their morphology. For example, the stimuli-responsive shear thickening fluids have been employed to make liquid body armor. However, nearly all of those fluids can be trigged only by one type of environmental factors such as pH, heat, CO₂, light, and electric. Multiple stimuli-responsive fluids have realized by employing polymeric surfactants...

Details
Dong_PSM_01072014.pdf (134,9 KB)  vom 21.03.2014

25.02.2014 (Sondertermin)

14.15 Uhr im Seminarraum 1.04 (VDP 3)

Dr. Nikolai Severin

Department of Physics, Humboldt-Universität zu Berlin

"Dynamics and structure of mono-molecularly thick water-ethanol layers confined between graphene and mica "

Abstract:

The behaviour of multicomponent liquids in confining geometries is a fundamental physical problem, which plays a central role in fields such as nano-fluidics, molecular biophysics, single molecule spectroscopy, and nano-chemistry, e.g. for molecular transport through channels of biological membranes analyte recognition in molecular assays and molecular synthesis. We followed in-situ the dynamics within mixed monomolecular water-ethanol films in a slit pore between a hydrophilic atomically flat mica surface and a more hydrophobic graphene layer, using scanning force microscopy. ...

Details
Severin_PSM_250214.pdf (165,3 KB)  vom 20.02.2014

18.02.2014

17.15 Uhr im Hörsaal 1.26 (VSP 1)

Prof. Nikos Hadjichristidis

King Abdullah University of Science and Technology (KAUST),
Physical Sciences and Engineering Division, KAUST Catalysis Center,

"WELL-DEFINED POLYETHYLENES AND POLYETHYLENE-BASED BLOCK COPOLYMERS BY ANIONIC POLYMERIZATION AND POLYHOMOLOGATION "

Abstract:
Access to model (high degree of structural, molecular weight and compositional homogeneity) polyethylenes (PEs) and PE-based block copolymers is necessary in order to elucidate the structure-properties relationships, which are very important for polymer performance. The synthesis of such polymers requires a truly living process. These approaches usually require high vacuum techniques, which are demanding, time consuming and leads to a small quantities of products. Nevertheless, this is a small price to pay given the tremendous potential of model macromolecules for selecting the appropriate structures needed for specific applications...

Details
Hadjichristidis_PSM_18022014.pdf (140,7 KB)  vom 20.01.2014

11.02.2014 (Sondertermin)

14.15 Uhr im Seminarraum 1.04 (VDP 3)

Prof. Thomas Kiefhaber

Biophysikalische Chemie, TU München

"Folding and Dynamics of Proteins and Peptides"

Abstract:

"Protein function is often regulated by binding to specific partners, which leads to conformational changes that can range from subtle rearrangements in the native structure to folding/unfolding processes in major parts of the protein or of the whole protein. In recent years, a large number of proteins has been described that are unfolded in the absence of their binding partners (“intrinsically disordered proteins”; IDPs). Folding of these proteins is coupled to ..."

Details
Kiefhaber_PSM_110214.pdf (163,7 KB)  vom 31.01.2014

28.01.2014

17.15 Uhr im Hörsaal 1.26 (VSP 1)

Dr. Fajun Zhang

Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany

"Tuning Interactions in Protein Solutions towards Controlled Protein Crystallization "

Abstract:
Non-specific protein-protein interactions in aqueous solution play a crucial role on protein crystallization and protein-aggregation related diseases, such as cataracts, and sickle cell anemia [1]. A comprehensive understanding of interactions in protein solutions is still a challenge. In this talk, I will first show an efficient way to tune interactions and phase behavior in protein solutions using salts...

Details
Zhang_PSM_28012014.pdf (131 KB)  vom 08.11.2013

21.01.2014

17.15 Uhr im Hörsaal 1.26 (VSP 1)

Prof. Dimitri Ivanov

Université de Haute-Alsace, Mulhouse, France

"From Channel-Forming Ionic Liquid Crystals to Nanostructured Ion-Conducting Polymer Membranes"

Abstract:
Designing the topology of the fluid phase in nano-structured liquids is a key factor for a variety of practical applications ranging from drug delivery to membrane technology. Supramolecular assembly of low-molecular-weight compounds is a convenient tool to generate a diversity of structures that can be suitable for creating ion-selective membranes....

Details
Ivanov_PSM_21012014.pdf (67,4 KB)  vom 07.01.2014

07.01.2014

17.15 Uhr im Hörsaal 1.26 (VSP 1)

Dr. Martine Philipp

Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München

"Mechanical and structural instabilities around the demixing transition of PNIPAM solutions"

Abstract:
Certain thermo-responsive polymer solutions possess a demixing transition, which is of the lower critical solution temperature type. This phase transition is particularly sharp in case of aqueous poly(N-isopropyl acrylamide) (PNIPAM) solutions. Upon heating a homogeneous PNIPAM solution acros...

Details
Philipp_PSM_07012014.pdf (59,7 KB)  vom 08.11.2013