User Materials

HOW TO PERFORM XAS EXPERIMENTS AT CAMD

XAS TRAINING IN GEOL7900

REFERENCE X-RAY SPECTRA FOR METAL FOILS

X-RAY EMISSION LINE ENERGIES CHART (BY ELEMENT)

X-RAY EMISSION LINE ENERGIES CHART (BY ENERGY)

ATTENUATION AT LOW ENERGY

 

XAS Applications in Chemical Engineering

Polymerization of SiO2 units: From Quartz to Silica

Many topics in Chemical Engineering ask for structural information. Examples how such information can be achieved are shown here: In Quartz SiO2 units are linked together in highly ordered patterns whereas this is not the case for simple silicates. The polymerization of SiO2 units can be resolved at Si K-edge.Polimerization in Silicates: Si K-edge XANES shows an edge shift with increasing chain length.

Figure 1: The polymerization of SiO2 units can be resolved at Si K-edge

Figure 1: The polymerization of SiO2 units can be resolved at Si K-edge

Figure 2: Overview of Silicate polymers(from website)

Figure 2: Overview of Silicate polymers(from website)

Vulcanization of Rubber: Thermo-oxidative ageing – at S K-edge

Fig. 3 shows the processes at the sulfur crosslinks of vulcanized rubber during thermo-oxidative aging at sulfur K-edge using X-ray absorption near-edge structure (XANES).

Figure 3: Vulcanization of Rubber: Thermo-oxidative aging - at S K-edge.

Figure 3: Vulcanization of Rubber: Thermo-oxidative aging - at S K-edge.

 

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