Mr
Florian Jung
(Technische Universitรคt Mรผnchen, Physik-Department, Fachgebiet Physik weicher Materie)
21/06/2017, 10:45
Block copolymers self-assemble into nanostructures. Solvent vapor annealing (SVA) is an efficient method to improve the long-range order or to alter the morphology in block copolymer thin films.
In the present work, SVA is carried out on thin films from a polystyrene-b-poly(dimethyl siloxane) (PS-b-PDMS) diblock copolymer. For annealing, vapor mixtures of toluene and n-heptane were used,...
Christian Stieghorst
(TUM / FRM II)
21/06/2017, 11:00
PGAA and INAA are ideally suited for a panoramic analysis of the elemental composition in various materials. A bundle of advantages make these two methods attractive for archaeometry and cultural heritage, for instance low-destructiveness, straightforward sample preparation and good detection limits for many elements. Due to the fact that PGAA and INAA are complementary for several elements, a...
Dr
Alexandros Koutsioumpas
(JCNS)
22/06/2017, 09:15
Neutron reflectometry is one of the most powerful methods for investigating the structure of model lipid membranes. These model systems are more easily prepared and experimentally controlled than natural lipid membranes, which are an important integral part of animal and plant cells. In the present work we combine measurements of supported lipid membranes (SLBs) at the MARIA neutron...
Alexander Heldman
(MLZ TU Mรผnchen)
22/06/2017, 09:00
Short talk
The single crystalline elastic constants are essential for technical materials. For most of the engineering-alloys the fabrication of single-crystalline specimen is either difficult or even impossible and therefor the derivation of these constants is complicated.
Different diffraction techniques allow the investigation of poly-crystalline and multi-phase materials due to its outstanding...
Tobias Widmann
(TUM, Physik Department, E 13)
21/06/2017, 11:15
Strong volume shifts of polymer thin films due to small modifications of an external stimulus like temperature are desired for a number of applications such as thermoresponsive nanoswitches or drug delivery in medicine. In this context the polymer which received most attention so far is poly(N-isopropylacrylamide), PNIPAM. The volume shift arises due to the collapse transition of the polymer...
Dr
Ezzeldin Metwalli
(TU Mรผnchen)
22/06/2017, 09:45
Stable and safe lithium-ion batteries with high capacity are a current research area of great importance due to its applications in electric vehicles and flexible portable electric devices. Using the sol-gel method, TiO2/SiO2 nanostructured hybrid electrodes were prepared using polystyrene-block-polyethylene oxide (PS-b-PEO) diblock copolymer as a guiding template. The current study showed the...
Ms
Franziska Lรถhrer
(TU Mรผnchen, Physik-Department, LS Funktionelle Materialien)
20/06/2017, 11:00
With their easy processability, high flexibility and tunable optical properties, organic photovoltaics offer a wide range of potential applications. Although based on organic materials, photovoltaic devices typically contain metal contacts due to their unrivaled electronic conductivity. These contacts have a major influence on the solar cell performance. Our work focuses on the nanostructure...
Mr
Lucas Kreuzer
(TU Mรผnchen, Physik-Department, Fachgebiet Physik weicher Materie/ Lehrstuhl fรผr Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching)
21/06/2017, 11:00
Responsive polymers, especially in thin film morphology, are of great
interest for a wide variety of applications where a strong change of volume
is desired even for small changes of an external stimulus such
as temperature. In this context the most prominent representative
is poly(N isopropylacrylamide) (PNIPAM). We study a new block
copolymer which comprises a PNIPAM block and a...
Dr
Dietmar Schwahn
(Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universitรคt Mรผnchen (TUM),)
20/06/2017, 12:40
Biofouling, RO Membranes, Small-Angle Scattering, in-operando wastewater desalination
Ms
Judith Witte
(TU Berlin)
21/06/2017, 11:45
The physical properties of stimuli-responsive microgels and polymer brushes still attract great interest in basic research and lead to a lively discussion of potential technical applications. Prominent examples are systems, which undergo a temperature induced phase transition as the sample temperature changes.
Microgel particles can be easily organized as ultra-thin films at solid surfaces,...
Dr
Amir Syed Mohd
(Juelich Centre for Neutron Science JCNS)
21/06/2017, 11:30
Different combinations of ferromagnetic (FM) layers and antiferromagnetic (AFM) layers give rise to many exciting effects such as exchange bias [1] and exchange spring [2, 3]. It is well known that these effects are mainly governed by the proximity of FM/FM or FM/AFM or AFM/AFM interfaces. Moreover, different combinations of FM and AFM materials in the form of trilayers allow the co-existence...
Mrs
Victoria Kononikhina
(Helmholtz-Zentrum Geesthacht)
21/06/2017, 11:30
Short talk
ฮณ-TiAl alloys are attractive materials for structural high temperature applications due to their high specific tensile and creep strength. Nevertheless, their wider application is still hampered by the difficulties involved with TiAl processing and by the limited understanding how ductility and damage tolerance of the material during service is influenced by microstructure and phase...
Martin Muehlbauer
21/06/2017, 11:30
Short talk
Lithium-ion batteries are part of our everyday life powering innumerable devices. Especially lately the number of applications related to electromobility and energy storage is increasing. Besides higher energy/power density and rate capability this calls for further improvements the life span of Li-ion cells. There are still some processes inside lithium-ion batteries that are not understood...
Mr
Stephan Proeller
(MSE - Herzig Group)
20/06/2017, 12:00
The nanomorphology can strongly influence the physical properties of organic thin films. For example, polymer:fullerene blends used in organic photovoltaics vary significantly in performance depending on the inner film morphology. To allow large-scale production of these devices, control of the nanostructure during the processing of the active layer is important. This needs an understanding of...
Kirill Nemkovskiy
22/06/2017, 09:00
Short talk
One way for saving energy in daily life is using the magnetocaloric effect (MCE), i.e. the change of magnetic entropy and adiabatic temperature following a change in an applied magnetic field. The ferromagnetic compound MnFe4Si3 is a promising candidate for applications. It has a magnetic phase transition in the range of 300 K and shows a moderate MCE of 2.9 J/kg K at a reasonable magnetic...
Lorenz Bieรmann
(TU Mรผnchen, Physik-Department E13)
20/06/2017, 11:40
Towards flexible substrates for organic light emitting diodes and organic photovoltaics it is of significant interest to replace brittle and costly electrodes like ITO or FTO as well. PEDOT:PSS offers with its good conductivity, easy processibility, and inherent flexibility a suitable alternative to its rigid and transparent conducting oxide counterparts.
The hygroscopic behavior of the PSS...
Mr
Nitin Saxena
(Technische Universitรคt Mรผnchen, Lehrstuhl fรผr Funktionelle Materialien)
22/06/2017, 10:15
Kun Wang
(Technische Universitรคt Mรผnchen, Fakultรคt fรผr Physik, Lehrstuhl fรผr Funktionelle Materialien)
20/06/2017, 11:20
Hybrid solar cells, a combination of conventional inorganic and organic photovoltaic systems, offer outstanding potential due to their minor investment compared to inorganic solar cells and higher stability compared to organic solar cells. However, so far device efficiencies are significantly lower as compared to the other photovoltaic systems. A possible way to improve the film structure and...
Li Xiaosong
(TUM FRM)
20/06/2017, 12:00
Short talk
eutron activation analysis is a very sensitive method to determine main, minor and trace elements in materials. The FRM II offers a series of irradiation facilities with different neutron fluxes and properties for the multi-elements analysis. The presentation will introduce some projects to demonstrate the diverse applications of NAA.
Manufacturing of special alloys for the new generation of...
Dr
Michael Lerche
(University of California, Davis)
20/06/2017, 11:30
Short talk
ODIN (Optical and Diffraction Imaging with Neutrons) is a beamline project at the European Spallation Source (ESS). It is a collaboration between the ESS, PSI and TUM, with TUM as lead institution.
ODIN will provide a multi-purpose imaging capability with spatial resolutions down to the ฮผm-range. The pulsed nature of the ESS source will give access to wavelength- resolved information....
Vladimir Hutanu
21/06/2017, 10:30
Short talk
Solving complex magnetic structures like direct distinguishing between cycloidal, helical and amplitude modulated spin arrangements; interplay between the crystal and magnetic chirality; short range magnetic/nuclear correlations in frustrated systems; local spin anisotropy (susceptibility tensor approach) at the unit cell level; magnetic domains distribution and their dynamics in complex...
Mr
Matthias Dodenhรถft
(E21/NEPOMUC)
22/06/2017, 11:00
The precise knowledge of the surface structure is essential to understand e.g. chemical reactions, optimize catalytic techniques or develop nanoelectronic devices. It has been shown that Total Reflection High-energy Positron Diffraction (TRHEPD) is a powerful tool to determine the positions of adatoms and topmost layers of reconstructed surfaces with unprecedented accuracy. In contrast to the...
Dr
Sabine Pรผtter
(Jรผlich Centre for Neutron Science JCNS, Outstation at MLZ, Forschungszentrum Jรผlich GmbH)
21/06/2017, 10:30
To solve todays challenges in energy conversion and information technology, fundamental understanding of thin films and nanostructures is required [1,2,3]. Prerequisite, however, is the fabrication of thin films. Molecular Beam Epitaxy (MBE) is a very versatile method to grow high quality and high purity epitaxial films with low intrinsic defect concentrations and atomic-layer control.
At...
Dr
Emmanuel Kentzinger
(Jรผlich Centre for Neutron Science)
21/06/2017, 11:00
Short talk
In the past, we have simulated off-specular scattering of polarized neutrons from laterally patterned magnetic multilayers, based on the formalism developed by Boris Toperverg [1]. We would like to present how we used this theory so far [2].
[1] E. Kentzinger, U. Rรผcker, B. Toperverg, Physica B 335, 82 (2003)
[2] E. Kentzinger, U. Rรผcker, B. Toperverg, F. Ott and T. Brรผckel, PRB 77,...
Mr
Senlin Xia
(Lehrstuhl fรผr Funktionelle Materialien, Physik Department E 13, Technische Universitรคt Mรผnchen)
22/06/2017, 09:30
Nanostructured polymer films containing magnetic nanoparticles (NPs) are promising materials due to their potential applications in the areas of high-density storage and magnetic sensors. Owing to the advantages, like large-scale production and energy saving, printing techniques were employed to fabricate hybrid films composed of maghemite NPs and PS-b-PMMA diblock copolymer (DBC). External...
Dr
Judith Houston
(JCNS at MLZ)
22/06/2017, 09:00
The performance of organic photovoltaic devices (OPVs) depends critically on simultaneous control of the optoelectronic properties and nanoscale morphology of conjugated polyelectrolytes (CPEs).[1] Recently, self-assembly strategies have emerged as an elegant approach for the design and fabrication of reproducible nanoscale aggregates from CPE building blocks.[2] The challenge, however, is to...
Dr
Maria Maddalena Schiavone
(Jรผlich Centre for Neutron Science - Outstation at MLZ)
21/06/2017, 10:30
The development of combined techniques for measuring of the samples is generally desirable, because it allows following two or even more physical parameters on the same sample at the same time. In this regard, complementary time-resolved in-situ Fourier-transform infrared spectroscopy (FTIR) applied to small-angle neutron scattering (SANS) is useful for the investigation of structural changes...
Ms
Tetyana Kyrey
(JCNS at MLZ, Forschungszentrum Jรผlich GmbH, Stranski-Laboratorium, TU Berlin, 10623 Berlin)
21/06/2017, 11:30
Nanostructures and nanoparticles are on the top of technique and biomedical application. A special class of such systems is the polymers adsorbed on a substrate. Confinement at the surface changes their physical and chemical properties with respect to a bulk system that open a new possibility for the usage in long-time biomedical applications also at body temperature. Formation of stimuli...
Dr
Volker Kรถrstgens
(TU Mรผnchen, Physik-Department, LS Funktionelle Materialien)
20/06/2017, 12:20
*in situ* studies of particular fabrication steps
