World Record of Cavities
Porosity is the key to high-performance materials for energy storage systems, environmental technologies or catalysts: The more porous a solid state material is, the more liquids and gases it is able to store. However, a multitude of pores destabilizes the material.
In search of the stability limits of such frameworks, researchers of the TU Dresden’s Faculty of Chemistry broke a world record: DUT-60 is a new crystalline framework with the world’s highest specific surface and the highest specific pore volume (5.02 cm3g-1) measured so far among all known crystalline framework materials.
The specific surface area describes the sum of all surface boundaries a material has: the outer visible ones as well as the inner pores. 90.3% of DUT-60 is free volume. The metal-organic framework (MOF) can adsorb huge amounts of gas – and in that way it is able to store colossal quantities of gases or filter toxic gases from the air.
“Materials with specific surfaces as high as these could show new and unexpected phenomena,” explains Stefan Kaskel, Professor of Inorganic Chemistry at TU Dresden, the new material’s importance for science.
“If you imagine the inner surface of one gram of zeolite as an even, plane area, it would cover about 800 square metres, graphene would make it up to almost 3000 square metres. One gram of DUT-60 would attain an area of 7800 square metres.”
The material was developed by computational methods and synthesized subsequently. There are only few compounds of low density that are mechanically stable enough to be accessible for gases without their surfaces being destroyed.
“It took us five years from the computational development to the pure product DUT-60,” resumes Prof. Kaskel. “Due to its very complicated production, the material is more expensive than gold and diamonds and so far can be only synthesized in small quantities of maximum 50 milligram per batch.”
The former world record was held by the material NU-110 published by Omar Farha, Northwestern University, in 2012: Its pore volume of 4.40 cm3g-1 is significantly lower than the new record holder. DUT-60 marks an important step in the investigation of the upper limits of porosity in crystalline porous materials, and stimulates the development of new methods to determine inner surfaces.
Within the DFG Research Unit FOR2433, Prof. Kaskel and partners are working intensively on the production of new porous materials that can change their structures dynamically and adaptively adjust their pore sizes.
“Moreover, we are working on applications of porous materials within the fields of gas storage, environmental research, catalysis, batteries and air filtration. Here in Dresden, we are also producing metal organic frameworks on a scale of several kilograms. They can be ordered at the ‘Materials Center Dresden’.”
Prof. Dr. Stefan Kaskel
Chair of Inorganic Chemistry I
Angewandte Chemie: "Balancing Mechanical Stability and Ultrahigh Porosity in Crystalline Framework Materials"
https://doi.org/10.1002/anie.201808240 (International Edition)
https://doi.org/10.1002/ange.201808240 (German Edition)
Kim-Astrid Magister | Technische Universität Dresden
Elusive compounds of greenhouse gas isolated by Warwick chemists
18.09.2019 | University of Warwick
Study gives clues to the origin of Huntington's disease, and a new way to find drugs
18.09.2019 | Rockefeller University
Researchers from the Department of Atomically Resolved Dynamics of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg, the University of Hamburg and the European Molecular Biology Laboratory (EMBL) outstation in the city have developed a new method to watch biomolecules at work. This method dramatically simplifies starting enzymatic reactions by mixing a cocktail of small amounts of liquids with protein crystals. Determination of the protein structures at different times after mixing can be assembled into a time-lapse sequence that shows the molecular foundations of biology.
The functions of biomolecules are determined by their motions and structural changes. Yet it is a formidable challenge to understand these dynamic motions.
At the International Symposium on Automotive Lighting 2019 (ISAL) in Darmstadt from September 23 to 25, 2019, the Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, a provider of research and development services in the field of organic electronics, will present OLED light strips of any length with additional functionalities for the first time at booth no. 37.
Almost everyone is familiar with light strips for interior design. LED strips are available by the metre in DIY stores around the corner and are just as often...
Later during this century, around 2060, a paradigm shift in global energy consumption is expected: we will spend more energy for cooling than for heating....
Researchers from the Department of Atomically Resolved Dynamics of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg, the University of Potsdam (both in Germany) and the University of Toronto (Canada) have pieced together a detailed time-lapse movie revealing all the major steps during the catalytic cycle of an enzyme. Surprisingly, the communication between the protein units is accomplished via a water-network akin to a string telephone. This communication is aligned with a ‘breathing’ motion, that is the expansion and contraction of the protein.
This time-lapse sequence of structures reveals dynamic motions as a fundamental element in the molecular foundations of biology.
Two research teams have succeeded simultaneously in measuring the long-sought Thorium nuclear transition, which enables extremely precise nuclear clocks. TU Wien (Vienna) is part of both teams.
If you want to build the most accurate clock in the world, you need something that "ticks" very fast and extremely precise. In an atomic clock, electrons are...
10.09.2019 | Event News
04.09.2019 | Event News
29.08.2019 | Event News
18.09.2019 | Innovative Products
18.09.2019 | Physics and Astronomy
18.09.2019 | Materials Sciences