Teaching partner: Teaching trial with lightboard (Langmuir isotherm)

Being on tenure track at Aalto University, I need to follow pedagogical studies – which is great! One of the on-going activities is “teaching partner” with my own pedagogical mentor. I get to do trials with teaching – these are planned with justification, made, and afterwards, reflected. A perfect learning cycle.

Today, I made the first such trial, and went through the derivation of the Langmuir adsorption isotherm (single-site adsorption) with the lightboard system that has been built at Aalto Studios. Here, we are following the Nothwestern University model. Scientific articles have been written on the technique, e.g., Journal of Chemical Education 2017 https://pubs.acs.org/doi/10.1021/acs.jchemed.7b00004.

The result is openly shared through the Panopto platform, screen capture below and link here: https://aalto.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=2d56ca40-7ab8-401e-80e9-a9d100a13c1d. The video is also available in Youtube. This was my first trial and I am happy with the outcome, even though not everything went quite as planned.. watch yourself to know what I mean :). (It was all captured in just one recording, without too much planning, and a bit of roughness is fine in the video, I think.) Warmest thanks to Aalto Studios and Kalle Kataila for making this possible and for providing the video extremely fast. Description of the video, which is included in the Panopto recording, is copied below.

Description: Derivation of the Langmuir adsorption isotherm step by step for single-site adsorption. Discussion of model vs real (measured) adsorption isotherms. Adsorption isotherm refers to conditions where system is at equilibrium (net adsorption rate is zero) at constant temperature (isothermal conditions). Presentation of the Langmuir adsorption isotherm for dual-site dissociative adsorption and also case where there are multiple adsorbing substances in the gas phase. The presentation largely follows the H. Scott Fogler book “Elements of Chemical Reaction Engineering” and connection is made to the Langmuir single-site adsorption isotherm presented in the review on Atomic Layer Deposition, R. L. Puurunen J. Appl. Phys. 97 (2005) 121301, https://doi.org/10.1063/1.1940727. To be used in the Aalto University course CHEM-E1130 Catalysis and optionally elsewhere.

Update 12.1.2019: Link to Youtube https://youtu.be/KddVM4nxgwI added.

Posted by Riikka Puurunen

About Riikka Puurunen

Associate professor, Catalysis Science and Technology, at Aalto since February 2017
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