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Stimuli responsive polymersomes: Small Angle Neutron Scattering studies
May 27 14:30 - 15:30
- Diblock copolymers can self-assemble in solution in stable and robust polymersomes (vesicles),...
To deuterate or not to deuterate? That is the question
June 03 14:30 - 15:30
- Accepted wisdom when performing diffraction experiments with neutrons is to deuterate the...
Static and dynamic properties of a strong-leg spin-ladder
June 17 14:30 - 15:30
- The AF S = 1/2 Heisenberg spin ladder belongs to the simplest quantum magnets, yet disclosing the...
Radiography is a non-destructive method to x-ray objects using neutrons or x-ray beams. As a result one gets a silhouette that shows the different materials and inner structures of the object. Here not only the high penetration capability of the neutrons (e.g. metals) is decisive but the element specific attenuation coefficient allows to distinguish between hydrogen comprising materials (polymers, oils,
glue) and other materials. In the case of elements with large
absorption cross section for thermal neutrons it is advantageous to use fast neutrons as produced by nuclear fission. For certain applications, however, the comparison with x-rays leads to a more detailed recognition. For this reason all of this different types of radiation are available at the FRM-II. The instrument NECTAR uses fast neutrons provided by the converter facility. The instrument ANTARES
uses cold to thermal neutrons and in addition, the object can be investigated without moving using high energy x-rays. By means of stroboscopic technique dynamic procedures can be visualized like a running motor.
By turning the object and taking radiographies successively information about the three dimensional inner structure can be obtained. Using complex algorithms a tomography can be reconstructed from the series of radiographies enabling to depict the inner structure of the object. At the FRM-II we use modern imaging techniques to visualize highly complex objects.