SAXS

The combination of WAXD with Small Angle X-Ray Scattering (SAXS) is especially interesting for  the structural characterization of melt-spun semicrystalline synthetic fibers. The analysis of the WAXD pattern reveals information for phase identification and about the degree of crystalline orientation, whereas SAXS gives information about the fibrillar structure and the dimensions of the crystalline lamellae.

The structure of bicomponent fibers with a core-sheath structure can reflect the mutual influence of the components on their thermal profile along the spinline, leading to modified crystallization compared to monocomponent melt-spinning. This could be shown when examining the semicrystalline structure of homo- and heterobicomponent core-sheath fibers melt-spun from poly(ethylene terephthalate) (PET) and poly(phenylene sulfide) (PPS).

We found that the heterobicomponent arrangement can promote the formation of equally spaced and uniformly sized crystallites in the PET phase and highly oriented crystallites in the PPS phase.

BRUKER NanoStar - Structure analysis for nano-materials (SAXS & WAXS)

Application:

  • Nanoparticles
  • Textured materials: ordering, molecular arrangements

Structural parameters:

  • Nano-particle size distributions (<100nm) and shape determination
  • Ordering parameters for nano systems

Techniques:

  • Transmission scans: samples in capillaries and flat sample holders (with X-ray transparent windows)
  • Mechanical forces can be applied to the samples

Working principle:

With the BRUKER NanoStar, powders, thin bulk materials can be analyzed. Colleagues from Empa with frequent demands can get access to the instrument after training and may use it by reservation through an online system. However, the staff of the lab will give support in setting up an optimized experiment.

Contact:         (Dübendorf)

                        (St. Gallen)

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