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SUMMARY:IMX Talks - Resolving Hierarchical Structure with X-ray scattering
  imaging
DTSTART:20261102T163000
DTEND:20261102T173000
DTSTAMP:20261006T055113Z
UID:46a65d849cf0bbbdcb2ca86ac575f31964a442bc3339719dc4f250c4
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Marianne Liebi\, EPFL STI IMX CAM-X\nThe function of ma
 ny materials\, from biological tissues to industrial polymers\, depends on
  how their nanoscale building blocks are arranged and aligned within a mac
 roscopic structure\, which is essential to understand but difficult to res
 olve: established high-resolution techniques typically access only small s
 ample volumes\, limiting the ability to capture structural or biological v
 ariability across extended\, heterogeneous samples.\nSmall-angle X-ray sca
 ttering (SAXS) imaging probes local nanostructure by raster-scanning a foc
 used synchrotron beam across a sample. This can be extended to resolve nan
 ostructure orientation voxel-by-voxel in three dimensions in a method call
 ed SAXS tensor tomography\, which we implement in our open-source software
  package Mumott. In this presentation\, I will show how this approach\, an
 d its continued development\, can be applied across different material sys
 tems.\nFor injection-molded polymer packaging\, SAXS imaging has resolved 
 the layered anisotropic nanostructure important for its mechanical propert
 ies\, and\, combined with industrial processing simulations\, the structur
 e formation during thermal processing. Another example is bone\, where res
 olving structure requires both three-dimensional information and sufficien
 t sampling to capture biological variability. Combining 2D and 3D SAXS im
 aging\, we studied regional differences in the human femoral neck\, an ana
 tomical site relevant to hip fractures\, and\, at higher resolution\, reso
 lved alternating chirality between neighboring lamellae within individual 
 osteons\, a structural feature proposed on mechanical grounds over a centu
 ry ago.\nThese examples illustrate how tensor tomography\, extended beyond
  X-ray scattering to wide-angle diffraction and visible-light polarimetry\
 , provides a route to resolving hierarchical structure across a wide range
  of material systems.\n\nBio: Marianne Liebi studied food science at ET
 H Zurich\, where she also completed her PhD in 2013\, followed by postdoct
 oral research at the Paul Scherrer Institute and MAX IV Laboratory\, Lund.
  In 2017\, she started her own research group at Chalmers University of Te
 chnology\, Gothenburg\, and was appointed in 2021 as tenure-track Assis
 tant Professor at EPFL\, where she heads the Laboratory for X-ray Characte
 rization of Materials (cam-X) within the Institute of Materials\, in a joi
 nt position with the Paul Scherrer Institute (PSI). Her research devel
 ops advanced X-ray and optical imaging techniques\, centered on small-ang
 le X-ray scattering (SAXS) in 2D and 3D\, to resolve the hierarchical str
 ucture of materials ranging from fiber composites to pharmaceutical formul
 ations and bone.
LOCATION:BM 5202 https://plan.epfl.ch/?room==BM%205202 https://epfl.zoom.u
 s/j/63884474245
STATUS:CONFIRMED
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