Online Workshop:
Exploring Diffusion using Advanced Vapor Sorption Techniques

Tuesday 6th December 2022
10:30 am CET | 9:30 am GMT
2 hours incl. Q&A

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Dr. Michael Hoffmann
Fraunhofer IFAM

Dr. Anett Kondor
Surface Measurement Systems

Thomas Schmid
Surface Measurement Systems

Workshop partner:

Join us at this free online workshop, organised with Fraunhofer IFAM, as we explore using advanced vapor sorption techniques and instrumentation to explore and evaluate the diffusion behaviours of solid state materials.

Here to discuss this topic are two leading experts in vapor sorption analysis, Dr. Michael Hoffmann (Fraunhofer IFAM) & Dr. Anett Kondor (Surface Measurement Systems). They will explore the Dynamic Vapor Sorption and Inverse Gas Chromatography techniques, and how they are employed by labs across the world to provide detailed insight on diffusion. Listeners will be able to engage our speakers directly in a live Q&A session.

You can read the full agenda and abstracts, and register to attend free, below.


A brief introduction into Surface Measurement Systems, our history, our instruments, and a quick look at the agenda for the workshop.

with Thomas Schmid, Surface Measurement Systems

While materials such as ceramics, metals and glasses are generally impenetrable to water and similar small molecules, polymer systems are permeable. The diffusion of small molecules through polymers has a great importance in various fields such as medicine, textile industry, membrane separations, packaging in food industry, extraction of solvents and impurities and many more. Thus an accurate and detailed insight into diffusion properties are essential.

To investigation diffusion properties different aspects shall be addressed:

  • How to measure the diffusion, e.g. by Dynamic Vapour Sorption but other techniques are available?
  • How to prepare or design a good sample?
  • How to analyse the experimental results, in particular which diffusion model is used?
  • What questions can be answered by simulation of diffusion properties employing the detemined diffusion properties?

with Dr. Michael Hoffmann, Fraunhofer IFAM

Diffusion is the transport of material due to concentration gradients, or more precisely due to gradients in the chemical potential. Mass transfer is commonly described as diffusional phenomena in the presence of convective motion. Diffusion and mass transfer play a significant role in several materials processing operations. Diffusion and mass transfer are also of crucial importance in affecting the structure of solid products including segregation phenomena in castings and impurity distribution in crystal growth [1]. Inverse gas chromatography (iGC) can be applied to determine the diffusion coefficients for a wide range of vapors with various solids over a broad temperature range. iGC is generally considered an appropriate tool for measuring transport diffusion, since the experiments are performed in a flowing system and under concentration gradients. According to these considerations, iGC appears to be an appropriate method for diffusion investigations on FCC catalysts because it is a transport diffusion type measurement simulating to a certain degree diffusion in an actual FCC reaction zone.

Inverse Gas Chromatography Surface Energy Analyzer (IGC-SEA) was used to determine the diffusion coefficient of two different organic probes for two catalysis samples and the natural graphite at different temperatures in order to see the temperature effect on the diffusion of the different probes. During the webinar these results will be demonstrated and the principle of the analysis.

with Dr. Anett Kondor, Surface Measurement Systems

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