Di, 24.10.2017

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

Dr. Felix Scheliga

Universität Hamburg, Institut für Technische und Makromolekulare Chemie, Hamburg, Deutschland

Sonderveranstaltung:

Do, 26.10.2017

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

Dr. Kerstin Blank

Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Potsdam, Deutschland

"Molecular Force Sensors: from molecular mechanisms towards applications in biology and materials science"

Abstract
Biological systems are highly sophisticated smart materials. They are stimuli-responsive and possess impressive self-reporting and self-healing properties. They are consequently an important source of inspiration for materials scientists who aim to implement these properties in synthetic and biomimetic materials. In this context, we are specifically interested in (bio)molecules that act as molecular force sensors...

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Blank_PSM_27.10.2017.pdf (145,7 KB)  vom 18.09.2017

Di, 21.11.2017

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

Prof. Dr. Andreas Schönhals

Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Deutschland

"Structure-Property Relationships of Nanocomposite based on Polylactide and Layered Double Hydroxides as Nanofiller"

Abstract:
Polymer-based nanocomposites attracted recently a lot of attention from both the applicative and fundamental point of research. While the former point of view is due to the properties improvement compared to the corresponding matrix polymers the latter aspect is related to interaction of polymers with solid surfaces and confinement effects...

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Schönhals_PSM_21.11.2017.pdf (146,1 KB)  vom 18.09.2017

Di, 28.11.2017

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

Dr. Pieter Magusin

University of Cambridge, Institute of Chemistry, Cambridge, UK

04.07.17

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

Prof. Dr. Jutta Luettmer-Strathmann

University of Akron, Ohio, USA

“Investigation of sexithiophene properties with Monte Carlo simulations of a coarse-grained model"

Abstract:
Thiophenes have important applications in organic electronics, energy conversion, and storage. In this study, we focus on α-sexithiophene (α-6T), a small, π-conjugated molecule whose visible light absorption and high charge carrier mobility make it interesting for applications....

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Luettmer-Strathmann_PSM_04.07.2017.pdf (190,4 KB)  vom 23.05.2017

30.05.17

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

Prof. Dr. Sabine Beuermann

Technische Universität Clausthal, Institut für Technische Chemie, Deutschland

“Inducing β phase crystallinity in poly(vinylidene fluoride) via synthetic strategies or nanoparticle formation"

Abstract:
Poly(vinylidene fluoride) (PVDF) shows 5 crystalline phases, with the β phase being associated with piezo, pyro- and ferroelectric properties. Since synthesis and processing of PVDF generally yields the α phase, special treatment is required to yield β phase material...

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Beuermann_PSM_30.05.2017.pdf (256,5 KB)  vom 23.05.2017

02.05.17

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

Dr. Martin Brehm

Martin-Luther-Universität Halle-Wittenberg, Halle, Deutschland

“The Balance of Interactions in Ionic Liquids"

Abstract:
As a newly emerging class of solvents with many promising properties, ionic liquids have received considerable attention during the last decade. These compounds can exhibit a certain degree of long-range ordering, or even microphase separation, despite of being liquids, which typically possess only local order....

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Brehm_PSM_02.05.2017.pdf (128,5 KB)  vom 18.04.2017

31.01.17

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

Prof. René Androsch

Institut für Polymerwerkstoffe e.V., An-Institut an der Hochschule Merseburg

“About the a'/a-crystal polymorphism of poly (L-lactic acid) (PLLA)”

Abstract:
Crystallization of the PLLA melt at temperatures higher than about 120 °C leads to formation of orthorhombic a-crystals while at lower temperatures, close to the glass transition, growth of pseudohexagonal, conformational disordered a’-crystals is favored. The a’-form is metastable...

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Androsch_PSM_31012017.pdf (344,2 KB)  vom 04.11.2016

24.01.17

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

Prof. Sabine Ludwigs

Universität Stuttgart, Institut für Polymerchemie (IPOC), Lehrstuhl für Struktur und Eigenschaften polymerer Materialien

“Manipulation of Polymer Thin Films for Polymer Electronics & Electrochemical Devices”

Abstract:
The talk will give an overview about current activities of my research group on thin film manipulation of conjugated polymers. Recent research highlights include the tuning of aggregation of n-type semiconducting polymers via regioisomer control and the identification ...

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Ludwigs_PSM_24012017.pdf (231,2 KB)  vom 04.11.2016

17.01.17

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

Dr. habil. Costantino Creton

Soft Matter Science and Engineering Laboratory of the ESPCI ParisTech, France

“Mechanics of interpenetrated polymer networks”

Abstract:

We have been studying for a few years the mechanics of interpenetrated networks polymerized sequentially by swelling and polymerization steps. This strategy introduces a proportion of chains inside the material that are prestretched. When such materials are deformed the molecular strain becomes quite different from the macroscopic strain giving very interesting non-linear elastic properties and a 100 times higher fracture toughness. We will discuss how to optimize such properties and what are the molecular mechanisms leading to them.

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Creton_PSM_17.01.2017.pdf (230,1 KB)  vom 17.11.2016

06.12.16

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

Dr. Tiago Ferreira

Martin-Luther-University Halle-Wittenberg, Halle, Germany

“Molecular structure and dynamics in lipid bilayers from solid-state NMR experiments and MD simulations”

Abstract:
Lipid bilayers are essential constituents of living cells enabling cell compartmentalization and affecting membrane protein function. It is therefore important to understand how the molecular structure and dynamics of simple lipid bilayer models are affected by a number of factors,...

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Ferreira_PSM_06122016.pdf (230,7 KB)  vom 04.11.2016

29.11.16

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

Prof. Alejandro J. Müller

University of the Basque Country, San Sebastian, Spanien

“The influence of chain topology on the crystallization of polycaprolactones (PCLs): cyclic versus linear chains"

Abstract:
Narrow polydispersity cyclic PCL samples (C-PCLs) were prepared by means of controlled click chemistry techniques in the group of Scott Garyson at Tulane University (USA). Linear PCL counterparts (L-PCLs) of almost identical molecular weights were also obtained in a Mn range spanning 2 to 22 kg/mol. The samples were studied by Differential Scanning Calorimetry (DSC), Transmission Electron Microscopy (TEM) and Polarized Light Optical Microscopy (PLOM)...

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Müller_PSM_29112016.pdf (243,7 KB)  vom 04.11.2016

15.11.16

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

Prof. Manfred Klüppel

Deutsches Institut für Kautschuktechnologie e. V., Hannover, Germany

“Flocculation Dynamics and Reinforcement of Elastomer Nanocomposites with Conductive Fillers: A Combined Rheological and Dielectric Analysis”

Abstract:
The flocculation dynamics of carbon black filled elastomer melts is investigated by dielectric relaxation spectroscopy in the frequency range from 0.1 Hz up to 10 MHz during oszillatory shearing in a plate-plate rheometer [1]. It is demonstrated that during heat treatment at low strain amplitude, a pronounced flocculation of filler particles takes place leading to a successive increase of the shear modulus and dc-conductivity...

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Klüppel_PSM_15112016.pdf (285,7 KB)  vom 04.11.2016

25.10.16

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

Prof. George Rose

Johns Hopkins University, Baltimore, USA

“Protein folding: non-specific interactions promote highly specific chain organization”

Abstract:

Under suitable conditions, globular proteins can self-assemble spontaneously and reliably.  An effective thermodynamic description of this folding reaction was established half a century ago, but a mechanistic understanding is still lacking.  This open question has been dubbed "the protein folding problem"....

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Rose_PSM_25102016.pdf (95,7 KB)  vom 19.10.2016

18.10.16

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

Dr. Angel Moreno

University of the Basque Country, San Sebastian, Spanien

“Single-Chain Polymer Nanoparticles: Models for Intrinsically Disordered Proteins and Soft Colloids"

Abstract:

Single chain nanoparticles (SCNPs) are an emergent and promising class of synthetic nano-objects. By means of large-scale computer simulations and small-angle neutron scattering, we design and investigate different synthesis routes, leading to SCNPs with specific structures and different properties in solution. On one hand the analysis of the conformations of SCNPs synthesized in good solvent reveals that they share basic ingredients with intrinsically disordered proteins (IDPs),…

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Moreno_PSM_18102016.pdf (190,2 KB)  vom 19.10.2016

20.06.16

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

Dr. David J. Jones

School of Chemistry, Bio21 Institute, University of Melbourne, Melbourne, Australia

“SIDE-CHAIN ENGINEERING IN HIGH PERFORMANCE P-TYPE ORGANIC SEMICONDUCTORS FOR PRINTED OPV”

Abstract:
The Victorian Organic Solar Cell Consortium (VICOSC) has had a two-pronged approach to the development of printed OPV. One arm has focused on the scale-up of the printing process, translating laboratory-based process to commercially relevant systems. This work has used commercial materials and off the shelf printers, where available, to develop a materials agnostic printing process.[1] New materials, with suitable properties, can be “dropped-into” the program. A parallel program has developed new materials via a rigorous stage-gated process resulting in high performance n- and p-type organic semiconductors for our use. We are interested in the impact of chromophore side chains on materials performance...

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Jones_PSM_0200616.pdf (218,4 KB)  vom 20.05.2016

05.04.16

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

Dr. Oleksandr Dolynchuk

Leibniz-Institute of Polymer Research Dresden, Insitute Theory of Polymers

“Invertible shape-memory effect in linear polyethylene and poly(ε-caprolactone)”

Abstract:
The experimental and theoretical investigation of invertible shape-memory (SM) effect in crystallizable covalent networks is in focus due to fundamental interest of underlying molecular mechanisms and various applications of SM polymers as sensors and actuators. This work studies the invertible SM behavior of crosslinked high-density polyethylene (HDPE) and poly(ε-caprolactone) (PCL)...

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Dolynchuk_PSM_050416.pdf (248,6 KB)  vom 31.03.2016

26.01.16

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

Prof. Lillian Chong

University of Pittsburgh, Department of Chemistry

“Enhanced Sampling of Pathways and Kinetics of Rare Events using Weighted Ensembles of Trajectories”

Abstract:
The weighted ensemble (WE) path sampling strategy orchestrates quasi-independent parallel simulations that are run with intermittent communication to enhance sampling of rare events such as protein conformational changes, folding, and binding. Trajectories are pruned or replicated in a way that encourages sampling of under-explored regions without biasing the dynamics. I will present recent advances in both WE methodology and software along with applications to protein folding and binding processes in the generation of pathways, free energy landscapes, and rate constants.

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Chong_PSM_26012016.pdf (119,2 KB)  vom 10.11.2015

19.01.16

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

Prof. Alexander Wittemann

Universität Konstanz

“From nanoparticles towards “colloidal molecules” and partially beyond.”

Abstract:
The rational design of complex functional colloids from nanoscale building blocks is of significance to practical applications including sensing, photonic, and electronic devices, but it is also becoming a source of inspiration of materials scientists and engineers to create the next-generation of hierarchically organized materials. ...

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Wittemann_PSM_19012016.pdf (120,2 KB)  vom 10.11.2015

01.12.15

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

Dr. Michael Sommer

Uni Freiburg, Institut für Makromolekulare Chemie

“Conjugated and responsive polymers: defect structures, new syntheses and high performance materials”

Abstract:
My group focuses on the development of new materials for use in opto-electronic devices as well as for sensing applications. Suitable candidates of high performance conjugated polymers have been identified as active materials for a variety of thin film devices including photovoltaic cells, field-effect transistors, light emitting diodes, batteries or supercapacitors. A major challenge that has moved into focus is the quest for simpler, greener and environmentally more benign synthesis routes while maintaining high performance, batch-to-batch reproducibility and control over molecular weight. In the first part of my talk, I will explore the scope and limitations of direct C-H activation polycondensation (DAP),...

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Sommer_PSM_01122015.pdf (125 KB)  vom 02.11.2015

24.11.15

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

Prof. Birgit Strodel

(Computational Biochemistry Group ICS-6: Structural Biochemistry, Forschungzentrum Jülich)

“Thermodynamics and kinetics of amyloid aggregation from atomistic simulations”

Abstract:
A major cause for cellular toxicity involved in the onset of several neurodegenerative diseases is the aberrant aggregation of proteins into oligomers and eventually fibrils. In the case of Alzheimer's disease, the main aggregating protein is the amyloid β-protein with two main alloforms of 40 (Aβ40) and 42 (Aβ42) amino acids. Numerous experimental studies have shown that...

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Strodel_PSM_24112015.pdf (161,1 KB)  vom 10.11.2015

17.11.15

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

Prof. Felix Schacher

Friedrich-Schiller-Universität Jena, Jena Center of Soft Matter

“Opportunities for Block Copolymers in Interface Design: Membranes and Hybrid Materials”

Abstract:
Block copolymers represent a unique class of building blocks for the generation of nanostructured materials in different environments – mainly driven by the inherent immiscibility of unlike segments. Our focus is put on materials which contain at least one segment which can be selectively addressed, either chemically (crosslinking, modification) or physically and how such materials can be used to "design" polymer-polymer interfaces in membrane materials or polymer-metal interfaces. In the latter case, especially core-shell hybrid materials are of interest, e.g. metal or metal oxide nanoparticles where suitable block copolymer ligands allow to control surface charge, charge density, or nature and amount of functional groups being present.

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Schacher_PSM_17112015.pdf (181,7 KB)  vom 24.08.2015

03.11.15

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

Dr. Arnold Boersma

University of Groningen, Netherlands

"Quantification and consequences of macromolecular crowding”

Abstract:
Cells are highly crowded with proteins and polynucleotides, with concentrations ranging from 80 to 400 mg/mL. Knowledge of crowding is critical to understand cell physiology and to assess its relevance for medical science and biotechnology: Any reaction that depends on the available volume can be affected by crowding, which includes diffusion, conformation, association, folding, phase separation, and aggregation of the biopolymers....

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Boersma_PSM_03112015.pdf (119,3 KB)  vom 27.10.2015

27.10.15

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

Dr. Ilja Gunkel

Soft Matter Physics Group, Adolphe Merkle Institute, Fribourg Switzerland

“In situ grazing-incidence small-angle X-ray scattering studies of block copolymer films during solvent vapor annealing”

Abstract:
The self-assembly of block copolymers is a powerful approach toward the fabrication of templates and scaffolds for nanostructured morphologies. Block copolymers in thin films are useful, for example, for the generation of masks for lithography applications....

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Gunkel_PSM_27102015.pdf (90,6 KB)  vom 16.10.2015

20.10.15

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

Prof. Dr. Jörg Tiller

TU Dortmund, Lehrstuhl für  Biomaterialien und Polymerwissenschaften

“Shape Memory Natural Rubber (SMNR) - A Smart Material”

Abstract:
Lowly cross-linked natural rubber forms crystals upon strain that are stable at room temperature and thus stabilize the stretched state until heat in the region of body temperature is applied. Thus,  SMNR is so far the only cold programmable shape memory polymer. Since the crystals and the amorphous state can be altered in the stretched form, programmed SMNR is additionally reacting to environmental signals such as various chemical vapors, sensing and memorizing them, and reacting to those.

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Tiller_PSM_20102015.pdf (89,9 KB)  vom 24.08.2015

02.06.15

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

Prof. Ulrich H. E. Hansmann

Department of Chemistry and Biochemistry, University of Oklahoma,  USA

“Simulation of Folding and Aggregation of Proteins”

Abstract:

A detailed knowledge of the processes by that proteins fold, self-assemble or aggregate is crucial for an understanding of disease pathways and the working of drugs at the level of cells. As these fundamental processes are difficult to trace in experiments, there is a need for reliable computational tools that complement experiments in studying folding and aggregation of proteins.
In this talk, I will describe some of the methods and techniques…

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Hansmann_PSM_02062015.pdf (208,9 KB)  vom 01.06.2015

Sondertermin 06.02.15

9.15 Uhr im Seminarraum 1.27 Von-Seckendorff-Platz 1, 06120 Halle

Dr. Dr. Clemens Liedel

Cornell University, Department of Materials Science and Engineering, Ithaca,  USA

"Influences on the Structure Formation in Elec-tro-Responsive and Redox-Active Polymers"

Abstract:
While block copolymers can self-assemble into ordered structures with dimensions of up to a few micrometers, grains with different orientation prevent macroscopic ordering. Larger patterns are only accessible using external directing forces, for example patterned surfaces or electric fields. Additives like solvents or nanoparticles further influence the kinetics of structure formation and the kind and order of the formed morphologies….

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Liedel_PSM_06022015.pdf (210,5 KB)  vom 29.01.2015