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

July 17, 2019

Carbon materials such as nanotubes, graphene, activated carbon and graphite are in high demand. Demands are thought 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 great impact on the properties of carbon materials. This is because the structure of carbon materials effect 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 magnetic field. However, there have been no reports of experiments using a High Magnetic Field (HMF) in the preparation process of carbon materials 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 superconducting magnets to coax activated carbon precursor of carbonized coal tar pitch during the mesophase (liquid crystal) 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.
About Shinshu University:

Shinshu University is a national university in Japan founded in 1949 and working on providing solutions for building a sustainable society through interdisciplinary research fields: material science (carbon, fiber, composites), biomedical science (for intractable diseases, preventive medicine), and mountain science. We aim to boost research and innovation capability through collaborative projects with distinguished researchers from the world. For more information please see: http://www.shinshu-u.ac.jp/english/

Shinshu University

Related Graphene Articles from Brightsurf:

How to stack graphene up to four layers
IBS research team reports a novel method to grow multi-layered, single-crystalline graphene with a selected stacking order in a wafer scale.

Graphene-Adsorbate van der Waals bonding memory inspires 'smart' graphene sensors
Electric field modulation of the graphene-adsorbate interaction induces unique van der Waals (vdW) bonding which were previously assumed to be randomized by thermal energy after the electric field is turned off.

Graphene: It is all about the toppings
The way graphene interacts with other materials depends on how these materials are brought into contact with the graphene.

Discovery of graphene switch
Researchers at Japan Advanced Institute of Science and Technology (JAIST) successfully developed the special in-situ transmission electron microscope technique to measure the current-voltage curve of graphene nanoribbon (GNR) with observing the edge structure and found that the electrical conductance of narrow GNRs with a zigzag edge structure abruptly increased above the critical bias voltage, indicating that which they are expected to be applied to switching devices, which are the smallest in the world.

New 'brick' for nanotechnology: Graphene Nanomesh
Researchers at Japan advanced institute of science and technology (JAIST) successfully fabricated suspended graphene nanomesh (GNM) by using the focused helium ion beam technology.

Flatter graphene, faster electrons
Scientists from the Swiss Nanoscience Institute and the Department of Physics at the University of Basel developed a technique to flatten corrugations in graphene layers.

Graphene Flagship publishes handbook of graphene manufacturing
The EU-funded research project Graphene Flagship has published a comprehensive guide explaining how to produce and process graphene and related materials (GRMs).

How to induce magnetism in graphene
Graphene, a two-dimensional structure made of carbon, is a material with excellent mechani-cal, electronic and optical properties.

Graphene: The more you bend it, the softer it gets
New research by engineers at the University of Illinois combines atomic-scale experimentation with computer modeling to determine how much energy it takes to bend multilayer graphene -- a question that has eluded scientists since graphene was first isolated.

How do you know it's perfect graphene?
Scientists at the US Department of Energy's Ames Laboratory have discovered an indicator that reliably demonstrates a sample's high quality, and it was one that was hiding in plain sight for decades.

Read More: Graphene News and Graphene Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.