Distinguished iNANO lecture: SAXS imaging from 2D to 3D
Assistant Professor Marianne Liebi, Chalmers University of Technology Göteborg/MAXIV Laboratory Lund, Sweden
Info about event
Time
Location
iNANO AUD (1593-012), Gustav Wieds vej 14, 8000 Aarhus University
Assistant Professor Marianne Liebi, Condensed Matter Physics, Department of Physics, Chalmers University of Technology, Sweden
SAXS imaging from 2D to 3D
Microscopy in scanning mode allows to image different contrasts from the sample, by probing not only absorption and phase contrast of the sample but for example a full X-ray fluorescence spectrum or a 2D scattering pattern. SAXS imaging is in particular valuable for heterogeneous samples, in which structural elements in the nanoscale change over macroscopic length scales, thus several millimeters or centimeters [1]. The SAXS patterns provide statistical information about the nanostructure in each scan point thus this method is complementary to high-resolution imaging techniques, such as electron microscopy. The information extracted from each small-angle scattering pattern can be used to create images with different contrast, such as density of nano-scale features or orientation of nanostructures [2]. The method can also be combined with computed tomography to study the inside of three-dimensional samples [3,4,5]. Using this technique on bone, the orientation of the mineralized collagen fibrils can be studied, as well as size parameters of the minerals, such as the thickness of the hydroxyapatite platelets.
References
1. Fratzl P.,Jokob, H.F., Rinnerthaler, S., Roschger, P., Klaushofer, K., Position-resolved Small Angle X-ray Scattering of Complex Biological Materials., J. App. Cryst, 1997, 30, 765.
2. Bunk, O., Bech, M., Jensen, T.H., Feidenhans’l R., Binderup, T., Menzel, A., Pfeiffer, F. Multimodal x-ray scatter imaging., New J. of Phys., 2009, 11, 123016.
3. Liebi, M., Geogiadis, M., Menzel, A., Schneider P., Kohlbrecher, J., Bunk, O., Guizar-Sicairos, M., Nanostructure surveys of macroscopic specimens by small-angle scattering tensor tomography, Nature, 2015, 527, 349.
4. Schaff, F., Bech, M., Zaslansky P., Jud, C., Liebi, M., Guizar-Sicairos, M., Pfeiffer, F., Six-dimensional real and reciprocal space small-angle X-ray scattering tomography, Nature, 2015, 527, 353.
5. Liebi, M.; Georgiadis, M.; Kohlbrecher, J.; Holler, M.; Raabe, J.; Usov, I.; Menzel, A.; Schneider, P.; Bunk, O.; Guizar-Sicairos, M., Small-angle X-ray scattering tensor tomography: model of the three-dimensional reciprocal-space map, reconstruction algorithm and angular sampling requirements. Acta Crystallographica Section A 2018, 74 (1), 12-24.
Host: Associate Professor Henrik Birkedal, iNANO & Department of Chemistry, Aarhus University
Coffee, tea, and bread will be served from 10:00 in front of iNANO AUD