Martin Luther University Halle-Wittenberg

SFB TRR 102 Logo

Further settings

Login for editors

Polymer and Soft Matter Seminars

Forthcoming Events

The Polymer- and Sofmatter Seminars take always place in the seminar room 1.27 (VDP 4) at 5.15 pm.

Tue, 18.12.2018

17:15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Walter Focke

Institute of Applied Materials, Department of Chemical Engineering, University of Pretoria, South Africa

"The effect of migration of small molecules in polymers on the design of controlled release devices for malaria vector control"

Astract:
Malaria  vector control aims to prevent malaria parasite transmission by either  repelling or killing the disease transmitting mosquitoes. In the latter  case the insect killing is done either before humans are bitten or,  rather surprisingly, afterwards! ...

Details
Focke_PMS_18_12_2018.pdf (143.4 KB)  vom 21.09.2018

Tue, 08.01.2019

17:15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Kay Saalwächter

Institut für Physik, Naturwissenschaftliche Fakultät II,
Martin-Luther-Universtität Halle-Wittenberg, Halle (Saale)

Polymer materials: more than just plastics"

Abstract:
With  packaging applications being the most tangible and often debated ones,  materials based upon synthetic polymers are found virtually anywhere  around us - with properties and uses that could not vary more widely.  This presentation, aimed in particular at early-stage students, gives  some account of the long history of polymer development and use,  focusing on an introduction into the main classes of polymer materials.  Some specific developments, which sometimes ran parallel in Europe and  the US, and took place despite of as well as because of the upheavals in  the first half of the 20th century, will be highlighted.

Details
Saalwächter_PMS_08012019.pdf (143.4 KB)  vom 23.10.2018

Past Events

Tue, 4.12.2018

17:15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Kay Saalwächter

Institut für Physik, Naturwissenschaftliche Fakultät II,
Martin-Luther-Universtität Halle-Wittenberg, Halle (Saale)

“Polymeric materials: environmental perspectives"

Abstract:
Mainly  due to mismanaged waste, remains of polymer materials have entered our  ecosystem in large quantities and are unfortunately there to stay for  centuries. While our awareness of the related problems increases,  societal and political decisions have urgently to be made. An  introduction into the extent of the problem and the differences in  tackling it encountered in Germany and the US, and a scientific account  from the viewpoint of a polymer scientist shall be given. Active  participation of the audience in terms of question and answer, and  discussion is highly appreciated.

Details
Saalwächter_PMS_04122018.pdf (486.7 KB)  vom 06.11.2018

Tue, 06.11.2018

17:15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Samuli Ollila

Institute of Biotechnology, University of Helsinki, Finland

“Combining MD simulations and NMR experiments of lipid bilayers and proteins"

Abstract:
Direct comparison between MD  simulations and NMR experiments can be used to interpret the experiments  and improve simulation models. This has been especially useful for the  studies of ion binding to lipid bilayers, oxidized lipids and disordered proteins. I will present improvement and validation of MD simulations  models for lipids and proteins together with the interpretation of order  parameters measured from solid state NMR and spin relaxation times  measured from solution state NMR.

Details
Ollila_PMS_6_11_2018.pdf (143.1 KB)  vom 09.10.2018

Tue, 30.10.2018

17:15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Jennifer Qing Lu

University of California, Merced, USA

"A new class of submolecular switches based on the DBCOD conformational change"

Abstract:
Dibenzocyclooctadiene  (DBCOD) is composed of a flexible eight‐membered ring fused into two  rigid phenyl rings. It can be regarded as the simplest submolecular  structure that can undergo controlled conformational changes. ...

Details
Lu_PMS_30_10_2018.pdf (174.8 KB)  vom 18.09.2018

Tue, 23.10.2018

17:15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Stephen Schrettl

Universität Freiburg, Adolphe Merkle Institut, Schweiz

"Responsive Materials Based on Non-Covalent Interactions"

Abstract:
Supramolecular  polymers are furnished by the assembly of monomeric units equipped with  binding motifs that form directional, non-covalent interactions such as  hydrogen bonds, π-interactions, or metal-ligand coordination complexes. Exposure of the bulk polymers to external stimuli such as heat, light,  mechanical force, or certain chemicals disrupts the reversible and  dynamic linkages, leading to a disassembly into the monomers and  pronounced changes of the materials properties. [...]

Details
Schrettl_PMS_23_10_2018.pdf (287.9 KB)  vom 16.10.2018

Mon, 22.10.2018 - Special event!

17:15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Siegfried Stapf

Institut für Physik, Technische Universität Ilmenau

"Relaxation and diffusion in polymer melts and solutions: new experimental approaches to probe molecular dynamics in homopolymers and copolymers"

Abstract:
The time-dependence of the rms displacements of chain segments in polymer melts has been a cornerstone of experimental tests of various chain motion models. Rouse and Reptation dynamics (below and above the entanglement limits for chain lengths, respectively) are described by characteristic power-laws. Neutron spin echo and gradient NMR studies have tested and confirmed these power-laws, but have also found discrepancies in some cases. The wide time gap between these two techniques is partially covered by NMR relaxometry. Again, relaxometry finds power-law relationships between NMR relaxation times and Larmor frequency, but both the dependence on frequency and molecular weight were shown to deviate substantially from tube-reptation predictions.

[...]

Details
Stapf_PMS_22_10_2018.pdf (145.7 KB)  vom 09.10.2018

Wed, 17.10.2018 - Special event!

17:15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. So Youn Kim

School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), South Korea

“Spreading Area-dependent Phase Diagram of Block Copolymer Self-assembly at the Air/Water Interface"

Abstract:
While  general agreements exist for phase diagrams of BCP self-assembly in  bulk or thin films, a fundamental understanding of BCP structures at the  air/water interface still remain elusive. The current version of phase  diagram of BCPs at the air/water interface explains morphology  transition of BCPs with relative fraction of each block: block fraction  is the only parameter to control the morphology. ...

Details
Kim_PMS_17_10_2018.pdf (144.5 KB)  vom 09.10.2018

Wed, 11.07.2018 - Special event

17:15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Melik Demirel

Penn State College of Earth and Mineral Sciences, Department of Materials Science and Ingineering, Pennsylvania, USA

Mapping the Energy Landscape of Repetitive Structural Proteins"

Abstract:
Despite six decades of intensive studies in fibrous  proteins, a viable approach for mapping the amino-acid sequences of  these proteins to self-assembly and materials properties does not yet  exist. New technologies are required to synthesize pooled libraries of  repetitive genes that en-code fibrous proteins, characterize the  self-assembly behavior of these proteins in high-throughput, and  discover sequences that form materials with novel physical properties.  To address these challenges, we combined recent developments in  synthetic biology and
femtosecond optics to create revolutionary  fibers and materials. High-throughput screening of tandem-repeat  libraries will enable the discovery of sequences with unprecedented  physical properties and improve our understanding of self-assembly,  leading to revolutionary advances in materials and life sciences.

Details
Demirel_PMS_11_07_2018.pdf (144 KB)  vom 14.06.2018

Tue, 26.06.2018

17:15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Viktor Ivanov

Faculty of Physics, Moscow State University, Moscow, Russia

To what extent can mesoscale computer simulation be used to predict properties of (macro)molecular systems?"

Abstract:
In  this talk, I will give an overview about recent work in my group on the  mesoscale computer simulation of conformational and dynamic properties  of several (macro)molecular systems. In our studies, we have used the  dissipative particle dynamics (DPD) method [1,2]. Following the  multiscale computer simulation approach, we have developed  coarse-grained (CG) models for polymer nanocomposites [3], organic and  water solutions of lecithin and bile-salts [4,5], polyimides [6],  precursors of polyacrylonitrile fibers, polyurethanes. ...

Details
Ivanov_PMS_26_06_2018.pdf (146.5 KB)  vom 13.06.2018

Tue, 29.05.2018

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Thomas Heinze

Friedrich-Schiller-Universität Jena, Institut für Organische Chemie und Makromolekulare Chemie, Jena, Deutschland

“New products from polysaccharides – simple chemistry with great effect"

Abstract:
While  the commercial chemistry of polysaccharides is limited due to the low  reactivity of the heterogeneous reactions, homogeneous chemistry opens  paths for the design of novel and highly engineered structures. Thus,  there is a need to find efficient solvents for cellulose that will be  discussed to some extent. However, to design novel functional materials,  not only homogeneous reactions applying special solvents but also the  conversion of activated and organo-soluble polysaccharide derivatives are in the center of recent interest....

Details
Heinze_PMS_29_05_2018.pdf (144.6 KB)  vom 08.05.2018

Tue, 08.05.2018

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Samuel Kyeremateng

AbbVie Deutschland GmbH & Co. KG, Ludwigshafen

"Role of Polymers in Amorphous Solid Dispersion Formulations"

Details
Kyeremateng_PSMS_08052018.pdf (533.2 KB)  vom 03.05.2018

Tue, 24.4.2018

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Björn Kuttich

Technische Universität Darmstadt, Institut für Festkörperphysik
Darmstadt, Germany

Macromolecules in spherical soft confinement"

Abstract:
Confinement  effects on macromolecules, either synthetic polymers or proteins, are  of great importance for nanotechnology and biology. The confinement may  thereby affect both structural properties as well as the dynamics of the  confined molecules. The situation is further complicated if a so-called  soft confinement is considered. This type of confining geometry is  deformable by the introduced guest molecules and exhibits shape  variations on a time scale relevant for these.
In my talk I want to  introduce two droplet phase microemulsions as soft confining geometry,  based on two different surfactants, i.e. the ionic Aerosol-OT (AOT) and  the non-ionic C12E4. In the absence of any guest molecule both systems  show very similar structure and dynamics. However, their effect on low  molecular weight polyethylene glycol (PEG) confined to the water filled  core of the microemulsion differs strongly. This is caused by a  different specific interaction between polymer and the respective  surfactant molecules.
By applying small angle X-ray and neutron  scattering as well as neutron spin echo spectroscopy and exploiting two  complementary contrast situations by appropriate deuteration, structure  and dynamics of the confined PEG can then be observed directly. The  different dynamic contributions of the confining droplets and the  confined polymer can be separated, revealing significant deviations from  the polymer properties in bulk solution.

Details
Kuttich_PMS_24_04_2018.pdf (144.3 KB)  vom 16.04.2018

Tue, 30.01.2018

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Ana Brás

Universtity of Cologne, Faculty of Mathematics and Natural Sciences, Department of Chemistry, Cologne, Germany

Structure and Dynamics of Polymers: Influence of Confinement, Architecture and Supramolecular Associations"

Abstract:
Over  the last decades, synthetic polymer materials have become an important  part of our everyday lives. At breakfast, we have bottles of orange  juice made of polyethylene. Our car bumper is made of high impact  polypropylene, the interior is largely composed of polyurethane, the  tires are elastomers and parts of the bodywork are polymer mixtures. In  this context, a fundamental understanding of the structure and dynamics  of polymers at different time and length scales is crucial for the  design of polymers with improved physical and mechanical properties for  nowadays applications. There are different experimental techniques  providing access to the properties of polymers from a microscopic to a  macroscopic scale.

Details
Ana Brás_PSM_30.01.2018.pdf (146.4 KB)  vom 15.12.2017

Tue, 19.12.2017

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Rupert Schnell

Polymerscience (Technology and Innovation) , Sabic, Bergen, Netherlands

Aging of Polycarbonate - Linking material science to real world problems

Abstract:
Polycarbonate  is an extremely versatile material whenever toughness and transparency  are required. Toughness of PC may deteriorate under thermal and chemical  treatment. Thermal influence on PC is summarized as “aging”. After more  than 60 years of commercial, use PC aging is still a subject of  academic research and causing problems in application. Some examples of  interesting PC performance, highlights in science and challenging  applications will be shown.

Details
Rupert Schnell_PSM_19.12.2017.pdf (143.4 KB)  vom 15.12.2017

Tue, 05.12.2017

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Dr. Georg Fytas

Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, Heraklion, Greece

"Controlling phonon propagation in architected soft matter"

Abstract:
Phononic crystals, i.e. composite materials in which a periodic distribution of elastic parameters facilitates control of the propagation of phonons, hold the promise to enable transformative material technologies in areas ranging from acoustic and thermal cloaking to thermoelectric devices. Realizing these opportunities requires strategies to deliberately ‘engineer’ the phononic band structure of materials in the frequency range of interest. ...

Details
Fytas_PSM_05.12.2017.pdf (171.8 KB)  vom 08.11.2017

Tue, 28.11.2017

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Pieter Magusin

University of Cambridge, Institute of Chemistry, Cambridge, UK

"Ex Situ and In Situ NMR of Battery Materials"

Abstract:
Our group investigates novel electrode materials for  lithium, sodium and magnesium ion batteries, and the solid electrolyte  interface (SEI) formed on the anodes. Both ex situ and in situ NMR  methods are employed, and it is the conjunction of these two approaches  which yields the most useful and relevant information. ...

Details
Magusin_PSM_28.11.2017.pdf (149.8 KB)  vom 15.11.2017

Tue. 21.11.2017

Prof. Dr. Andreas Schönhals

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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...

Details
Schönhals_PSM_21.11.2017.pdf (146.1 KB)  vom 18.09.2017

Tue, 24.10.2017

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Felix Scheliga

University of Hamburg, Chemistry Department, Hamburg, Germany

Polymer Characterization by Size Exclusion Chromatography: Manufacture and Applications

Abstract:
Since the early 1960´s SEC has become the most  important tool for polymer characterization. Nowadays the molecular  weight distribution of almost any dissolvable polymer can be obtained in  a few minutes, whereas this task would have taken weeks or months  before appropriate SEC columns were available.

Even though  SEC has become a commonplace method, little is known about the how these  SEC-materials are made. This talk is supposed to provide an overview on  the manufacture of SEC gels and the various products on the market.

Details
Felix Scheliga_PSM_24.10.2017.pdf (143.6 KB)  vom 17.10.2017

Special event:

Thu, 26.10.2017

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Kerstin Blank

Max Planck Institute of Colloids and Interfaces, Potsdam, Germany

"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...

Details
Blank_PSM_27.10.2017.pdf (145.7 KB)  vom 18.09.2017

Tue, 17.10.2017

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. David M. Smith

Fraunhofer Institute for Cell Therapy and Immunology, DNA Nanodevices group, Leipzig, Germany

“Bottom-up Engineering of Nanoscale Devices to Program Macroscopic Material Properties"

Abstract
Biological materials are often used as inspiration in the design of new synthetic or bio-hybrid materials; however, the molecular toolbox provided by biological systems has been evolutionarily optimized to carry out the necessary functions of cells. The resulting inability to systematically modify fundamental properties such as polymer stiffness or the association strength of crosslinking proteins in experimentally available model systems hinders a meticulous examination of the connection between molecular parameter space and resulting properties of bulk assemblies. We circumvent these limitations using model systems based on synthetically produced building blocks such as DNA strands and peptides, which are programmable on the molecular scale.

In one example, micrometer-long nanotubes with tunable diameters and rigidity can be constructed from small sets of short, DNA oligonucleotides. By systematically varying the set of DNA strands of these synthetic, semiflexible filaments, their micron-scale persistence length (Lp) can be precisely tuned. [...]

Details
Smith_PSM_17_10_2017.pdf (111.7 KB)  vom 06.10.2017

12.07.17

2.15 pm @ seminar room 1.26 Von-Seckendorff-Platz 1, 06120 Halle

Prof. Dr. Mark P. Taylor

Dept. of Physics, Hiram College, USA

Polymer folding in confined and crowded environments"

Abstract:
A flexible homopolymer chain with sufficiently short-range interactions undergoes a first-order-like transition from an expanded coil to a compact crystallite.  We have recently shown that this very simple model illustrates the underlying polymer physics leading to the distinct all-or-none folding thermodynamics characterizing many small proteins [1].  Here we investigate this polymer folding transition under geometric confinement and in the presence of macromolecular crowders...

Details
MP Taylor 12.07.2017.pdf (232.9 KB)  vom 05.07.2017

04.07.17

5.15 pm @ seminar room 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....

Details
Luettmer-Strathmann_PSM_04.07.2017.pdf (190.4 KB)  vom 23.05.2017

30.05.17

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Dr. Sabine Beuermann

Clausthal University of Technology, Institute of Technical Chemistry, Germany

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...

Details
Beuermann_PSM_30.05.2017.pdf (256.5 KB)  vom 23.05.2017

02.05.17

5.15 pm @ seminar room 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....

Details
Brehm_PSM_02.05.2017.pdf (128.5 KB)  vom 18.04.2017

31.01.17

5.15 pm @ seminar room 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...

Details
Androsch_PSM_31012017.pdf (344.2 KB)  vom 04.11.2016

24.01.17

5.15 pm @ seminar room 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 ...

Details
Ludwigs_PSM_24012017.pdf (231.2 KB)  vom 04.11.2016

17.01.17

5.15 pm @ seminar room 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.

Details
Creton_PSM_17.01.2017.pdf (230.1 KB)  vom 17.11.2016

06.12.16

5.15 pm @ seminar room 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,...

Details
Ferreira_PSM_06122016.pdf (230.7 KB)  vom 04.11.2016

29.11.16

5.15 pm @ seminar room 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)...

Details
Müller_PSM_29112016.pdf (243.7 KB)  vom 04.11.2016

15.11.16

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Manfred Klueppel

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...

Details
Klüppel_PSM_15112016.pdf (285.7 KB)  vom 04.11.2016

25.10.16

5.15 pm @ seminar room 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"....

Details
Rose_PSM_25102016.pdf (95.7 KB)  vom 19.10.2016

18.10.16

5.15 pm @ seminar room 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),…

Details
Moreno_PSM_18102016.pdf (190.2 KB)  vom 19.10.2016

20.06.16

5.15 pm @ seminar room 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...

Details
Jones_PSM_0200616.pdf (218.4 KB)  vom 20.05.2016

05.04.16

5.15 pm @ seminar room 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)...

Details
Dolynchuk_PSM_050416.pdf (248.6 KB)  vom 31.03.2016

26.01.16

5.15 pm @ seminar room 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.

Details
Chong_PSM_26012016.pdf (119.2 KB)  vom 10.11.2015

19.01.16

5.15 pm @ seminar room 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Alexander Wittemann

University of 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. ...

Details
Wittemann_PSM_19012016.pdf (120.2 KB)  vom 10.11.2015

01.12.15

5.15 pm @ seminar room 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),...

Details
Sommer_PSM_01122015.pdf (125 KB)  vom 02.11.2015

24.11.15

5.15 pm @ seminar room 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...

Details
Strodel_PSM_24112015.pdf (161.1 KB)  vom 10.11.2015

17.11.15

5.15 pm @ seminar room 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.

Details
Schacher_PSM_17112015.pdf (181.7 KB)  vom 24.08.2015

03.11.15

5.15 pm @ seminar room 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....

Details
Boersma_PSM_03112015.pdf (119.3 KB)  vom 27.10.2015

27.10.15

5.15 pm @ seminar room 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....

Details
Gunkel_PSM_27102015.pdf (90.6 KB)  vom 16.10.2015

20.10.15

5.15 pm @ seminar room 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.

Details
Tiller_PSM_20102015.pdf (89.9 KB)  vom 24.08.2015

02.06.15

5.15 pm @ seminar room 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…

Details
Hansmann_PSM_02062015.pdf (208.9 KB)  vom 01.06.2015

Special Event 06.02.15

9.15 am @ seminar room 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….

Details
Liedel_PSM_06022015.pdf (210.5 KB)  vom 29.01.2015

Up