High magnetic field of 10T during activated carbon production improves micropore capacity by 35%

High magnetic field of 10T during activated carbon production improves micropore capacity by 35%
(a) Polarizing microscopy image of carbonized coal tar pitch prepared in the absence and presence of magnetic fields of 2?T and 10?T. All figures show the diagonal position and extinction position. (b) Schematic drawing of a magnetic field effect on the carbonization process of coal tar pitch. Credit: Springer Nature, Licensed under CC BY 4.0

Carbon materials such as nanotubes, graphene, activated carbon and graphite are in high demand. Demand is forecast to continue to increase because carbon materials have many beneficial uses and new applications are being discovered. They are essential to air and water purification, electrodes in metal refining, manufacturing pencils, and lubricants. The carbon source quality (coal tar pitch), temperature, atmosphere, and preparation methods have a major impact on the properties of carbon materials. This is because the structure of carbon materials affect their properties, and the structure can be manipulated in production. Advancing new control parameters during production will lead to the refinement of the functionality of carbon materials.

All materials interact somewhat with magnetic fields whether or not they are magnetic. There have been many other research explorations into methods of orienting graphene and nanotubes in a . However, there have been no reports of experiments using a High Magnetic Field (HMF) in the preparation process of to manipulate the structure. This current research was made possible by the superconducting magnets that can create magnetic fields of 10 Teslas and beyond.

The research team lead by Atom Hamasaki of the Institute of Science at Shinshu University set out to create more efficient forms of activated carbon by utilizing the to coax activated carbon precursor of carbonized coal tar pitch during the mesophase () to form crystallites (similar process to making graphite), thus increasing the volume of pores in the activated carbon by 35%.

The HMF encourages crystallites to form, and when there are more crystallites, more crevasses are created where chemicals can come into contact with the activated carbon. Many other materials that have negative magnetic susceptibility may also be manufactured using this effective procedure with HMF to control for better properties.

High magnetic field of 10T during activated carbon production improves micropore capacity by 35%
Schematic drawing of the effect of an applied magnetic field on the formation of activated carbon. Credit: Springer Nature, Licensed under CC BY 4.0

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More information: Atom Hamasaki et al, Improving the Micropore Capacity of Activated Carbon by Preparation under a High Magnetic Field of 10 T, Scientific Reports (2019). DOI: 10.1038/s41598-019-43818-y
Journal information: Scientific Reports

Provided by Shinshu University
Citation: High magnetic field of 10T during activated carbon production improves micropore capacity by 35% (2019, July 17) retrieved 15 October 2019 from https://phys.org/news/2019-07-high-magnetic-field-10t-carbon.html
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Jul 18, 2019
A nice bit of "traditional" science ie "Lets try this in a gigantic magnetic field and see what happens!"

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