Online Seminar Series of Solid State and Materials Chemistry

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The Division of Solid State Chemistry & Materials Research of the German Chemical Society (GDCh) launched an online lecture series in 2021 to promote scientific exchange beyond the current Corona pandemic through location-independent, biweekly lectures. Participation is free of charge. Separate registration for each seminar is required (see below for details).


Online Seminar #9 (19. Oktober 2021): Dr. Alexander Knebel

Dr. Alexander Knebel, Friedrich-Schiller-Universität Jena, Germany
October 19, 2021  5:00pm (Berlin time) 
Registration

“Disruptive Membrane Technology based on MOF Materials: Towards Advanced CO2 Capture and Green Production”
To stop global warming and greenhouse gas emissions, metal-organic frameworks (MOFs) are highly potential candidates for the development of a disruptive membrane technology in key separation and purification applications. Membranes - as simple, physical barriers - are able to capture CO2 actively, e.g. by placing them in a waste gas stream. Additionally, membranes can reduce the energy consumption of separation and purification processes in comparison to conventional separations (e.g. distillation) by up to 80%, thus reducing CO2 passively. Therefore, our focus lies on materials engineering for the purpose of carbon capture and the green production: The preparation of MOF particles and thin films, development of neat MOF or mixed matrix polymer-filler membranes and their application in gas separation. We are bridging the gap from synthesis and shaping of materials. We realize novel material concepts by home-build technical equipment, characterize physical properties of MOFs and demonstrate unique separation mechanisms. We show the development of novel material concepts: Fundamentally, we investigate stimuli responsive, switchable MOFs that can control gas separation in-situ towards a multi-purpose “universal membrane”; Focusing on real-life applications, we develop ways towards high-performance materials. Here, we invented the first MOF-based liquids with permanent porosity and applied them for the green production of propylene.

 

 


Online Seminar #10 (2. November 2021): Jun.-Prof. Dr. Markus Suta

Jun.-Prof. Dr. Markus Suta, Heinrich-Heine-Universität Düsseldorf, Germany
November 02, 2021 5:00pm (Berlin time) 
Registration

"The principles of luminescence thermometry – An application also touching fundamental aspects of phosphors"
There is a growing demand on remote temperature sensing with spatial resolution at the micrometer scale and below. Ratiometric luminescence thermometry is a promising and non-invasive methodology for those length scales. Potential application areas range from in situ monitoring of temperature changes in chemical reactions, over in vivo bioimaging to investigation of fundamental thermodynamic phenomena at the nanoscale. A particularly simple way of luminescence thermometry employs an ensemble of non-interacting luminescent centers with two thermally coupled and radiatively emitting states from the same electron configuration. The luminescence intensity ratio then follows Boltzmann’s law. Trivalent lanthanoids with their narrow line 4fn-4fn luminescence doped into crystalline powders have emerged for this type of thermometry. The ultimate desire to design such thermometers for the application of interest requires, however, a careful understanding of both thermodynamic and kinetic concepts of their performance.
In this presentation, I will give a general overview over the foundations of this so-called Boltzmann-type thermometers. It will be demonstrated that every luminescent Boltzmann thermometer can be used for precise temperature measurements in only a small temperature window and what are strategies to overcome this obstacle. I will also show the relevance of excited state kinetics and how decisive the choice of the surrounding host compound for the lanthanoid ions is to control Boltzmann-type behavior of a luminescent thermometer. The interplay with energy transfer pathways will also be shortly highlighted. The presentation will conclude with a perspective on how seeking a better understanding of luminescent thermometers can also help understand the efficiency of phosphors quite generally.

 

 

Online Seminar #11 (16. November 2021): Dr. Jörn Bruns

Dr. Jörn Bruns, Universität Köln, Germany
November 16, 2021 5:00pm (Berlin time)  Registrierung

“Chemistry under extreme conditions – from silicate analogue network structures to technetates”
Rude colleagues say that solid states chemists follow for their reactions only the principle "shake and bake". Of course, high temperatures help to overcome activation barriers. However, we all know that this is not enough. A multitude of other parameters play an essential role for efficient solid-state (chemical) reactions. I will present you how we use extremely strong oxidizing agents, such as sulfuric acid or its anhydride SO3, to synthesize silicate analogous materials such as borosulfates. In these, the charge compensating heteropolyanionic subunits are composed of vertex-linked (SO4)- and (BO4)-tetrahedra. In contrast to the immense structural diversity of silicates, the number of borosulfates is yet very limited and the extent of their properties is still unknown. In an effort to expand the knowledge on oxoanionic networks even further, we have also gone and tested our systems on rhenates, manganates and technetates. In this context, the handling of technetium and its compounds is another challenge. In addition to the acids, strong alkaline media can be a perfect medium for the synthesis of oxidic and oxoanionic materials. And when it comes to the respective counter cations, our research goes as far as the elements beryllium and uranium.

Using a wide array of analytical methods such as optical spectroscopy, magnetochemistry and photoelectron spectroscopy we try to investigate all samples as detailed as possible and corroborate our findings by quantum chemical calculations.

Herein, I will therefore present an overview of our investigations on borosulfates and oxometallates, the role of acidic and basic reaction conditions and the effects of the counter cations on the chemistry. It will turn out that “shake and bake” does not always hold true, and that there is more to solid state chemistry than meets the eye.

 

 

Online Seminar #12 (30. November 2021): Dr. Jannika Lauth

Dr. Jannika Lauth, Leibniz-Universität Hannover, Germany
November 30, 2021 5:00pm (Berlin time) Registration

“Colloidal 2D Semiconductors: A Chemical Approach for Innovative Optoelectronics and Photonic Quantum Technologies"
Colloidal 2D semiconductors, so-called nanosheets and nanoplatelets, are only a few atom layers thick and exhibit promising optoelectronic properties that are chemically tunable between visible to infrared wavelengths. 2D semiconductors are strongly quantum-confined in their thickness dimension, resulting in the control, and fine-tuning of their narrow absorption and emission features. A key advantage of colloidal synthesis methods is the ability to grow not only ultrathin van der Waals structures but also intrinsically isotropic materials (e.g., cubic lead chalcogenides) into a strongly anisotropic crystal shape by the virtue of surface ligands and reaction conditions. I will touch on the synthetic tailoring of colloidal 2D semiconductors, on their integration into innovative optoelectronics (e.g. directed emission and polymer-encapsulation) and on their superior potential as single photon emitters for photonic quantum technologies.

 

 

Online Seminar #13 (14. Dezember 2021): Prof. Dr. Wolfgang Bensch

Prof. Dr. Wolfgang Bensch, Christian-Albrechts-Universität Kiel, Germany
December 14, 2021 5:00pm (Berlin time) 
Registration

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