Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

X-ray analysis of carbon nanostructures helps material design

13.03.2019

Optimized nanoporous carbons can serve as electrodes for fast electron and ion transport or improve the performance of energy storage and conversion devices. Thus the tunability of the size, shape, and distribution of pores is highly required.

The team at the HZB Institute for Soft Matter and Functional Materials collaborated with a group at the University of Tartu, Estonia, to inquire the nanoarchitecture, inner surface, size, form and distribution of nanopores in dependence of the synthesis conditions.


Schematic view of carbon structures with pores.

Credit: HZB

Colleagues in Estonia produced a series of nanoporous carbons by reacting a powder of molybdenum carbide (Mo2C) with gaseous chlorine at 600, 700, 800, 900, and 1000 degrees Celsius.

Depending on the synthesis conditions chosen, the nanoporous carbon exhibit different properties such as surface area, porosity, electronic and ionic conductivity, hydrophilicity and electrocatalytic activity.

Surface structures were analysed by transmission electron microscopy at the HZB. The interior surface area of nanocarbon materials is usually investigated by adsorption of gas.

However, this method is not only comparatively inaccurate, it also contains no information about the shape and size of the pores. For deeper insights, Dr. Eneli Härk and her colleagues at HZB worked with small-angle X-ray scattering, a technique permitting to obtain information on various structural features on the nanometer scale including the mean pore size.

Small-angle X-ray scattering not only provides information on the precise inner surface area and the average pore size, but also on their angularity, i.e., sharp edges of formed pores, which play a major role for the functionalization of the materials.

"The SAXS analysis summarizes over an enormous amount of micropores omitting misleading assumptions thereby directly relating the nanostructural architecture of the material to macroscopic technical parameters under investigation in engineering" Härk explains.

The main aim was to understand structural formation, and electrochemical characteristics of carbon as a function of the synthesis temperature. "For optimal function, not only the high inner surface area is crucial, but the pores should have exactly the right shape, size and distribution", says Härk.

Antonia Rötger | EurekAlert!
Further information:
https://www.helmholtz-berlin.de/pubbin/news_seite?nid=20400;sprache=en;seitenid=1
http://dx.doi.org/10.1016/j.carbon.2019.01.076

More articles from Materials Sciences:

nachricht From foam to bone: Plant cellulose can pave the way for healthy bone implants
19.03.2019 | University of British Columbia

nachricht Additive printing processes for flexible touchscreens: increased materials and cost efficiency
19.03.2019 | INM - Leibniz-Institut für Neue Materialien gGmbH

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Self-healing coating made of corn starch makes small scratches disappear through heat

Due to the special arrangement of its molecules, a new coating made of corn starch is able to repair small scratches by itself through heat: The cross-linking via ring-shaped molecules makes the material mobile, so that it compensates for the scratches and these disappear again.

Superficial micro-scratches on the car body or on other high-gloss surfaces are harmless, but annoying. Especially in the luxury segment such surfaces are...

Im Focus: Stellar cartography

The Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the Large Binocular Telescope (LBT) in Arizona released its first image of the surface magnetic field of another star. In a paper in the European journal Astronomy & Astrophysics, the PEPSI team presents a Zeeman- Doppler-Image of the surface of the magnetically active star II Pegasi.

A special technique allows astronomers to resolve the surfaces of faraway stars. Those are otherwise only seen as point sources, even in the largest telescopes...

Im Focus: Heading towards a tsunami of light

Researchers at Chalmers University of Technology and the University of Gothenburg, Sweden, have proposed a way to create a completely new source of radiation. Ultra-intense light pulses consist of the motion of a single wave and can be described as a tsunami of light. The strong wave can be used to study interactions between matter and light in a unique way. Their research is now published in the scientific journal Physical Review Letters.

"This source of radiation lets us look at reality through a new angle - it is like twisting a mirror and discovering something completely different," says...

Im Focus: Revealing the secret of the vacuum for the first time

New research group at the University of Jena combines theory and experiment to demonstrate for the first time certain physical processes in a quantum vacuum

For most people, a vacuum is an empty space. Quantum physics, on the other hand, assumes that even in this lowest-energy state, particles and antiparticles...

Im Focus: Sussex scientists one step closer to a clock that could replace GPS and Galileo

Physicists in the EPic Lab at University of Sussex make crucial development in global race to develop a portable atomic clock

Scientists in the Emergent Photonics Lab (EPic Lab) at the University of Sussex have made a breakthrough to a crucial element of an atomic clock - devices...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

International Modelica Conference with 330 visitors from 21 countries at OTH Regensburg

11.03.2019 | Event News

Selection Completed: 580 Young Scientists from 88 Countries at the Lindau Nobel Laureate Meeting

01.03.2019 | Event News

LightMAT 2019 – 3rd International Conference on Light Materials – Science and Technology

28.02.2019 | Event News

 
Latest News

Inselspital: Fewer CT scans needed after cerebral bleeding

20.03.2019 | Health and Medicine

Intelligent material improves aerodynamics in cars and aircraft

20.03.2019 | Trade Fair News

Self-healing coating made of corn starch makes small scratches disappear through heat

20.03.2019 | Trade Fair News

VideoLinks
Science & Research
Overview of more VideoLinks >>>