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Stable, Highly Conductive Boron Nitride Nanosheets

wallpapers Industry 2020-10-29
Achieving enhanced ion flow rates through channels and porous membranes is essential for many applications, such as energy storage and water desalination, but it is challenging.
A collaboration of researchers from Deakin University and ANSTO in Australia, Sorbonne University in France, and Drexel University in the United States has just published this research in the Journal of the American Chemical Society.
 
Boron nitride nanosheets are usually hydrophilic. The team used an understanding of nanosheets' interaction in solution during the filtration process to allow the nanosheets to self-assemble into unique structures in aqueous solutions.
ANSTO instrument scientist Chris Garvey and the AINSE Graduate Research Award recipient from Deakin University used Small Angle X-ray Scattering (SAXS) on the Australian synchrotron as a structural tool for detecting materials and characterizing dry and nanofluidic channels. Fully hydrated boron nitride film.
"The interaction of the nanosheets in the solution allows the nanosheets to self-assemble into materials with interesting structures as thin films with enhanced conductivity," Garvey explained.
 
The boron nitride nanosheets are stacked in a well-aligned manner to form a layered film structure.
Thousands of parallel slit-like ion channels are formed in a specific direction on the membrane, which acts as nanofluidic conduits.
 
The Australian synchrotron's measurements on the SAXS beamline allowed them to determine the layers' average spacing.
"The diameter of the X-ray beam is about 200-300 microns, which is very suitable for analyzing many nano-layers to perform statistical analysis of the structure," Garvey said.
SAXS measurements perpendicular to the beam indicate a lack of structural order along the film's lateral direction, which has also been reported for graphene oxide nanosheets.
The overall structure perspective shows that ions are excluded from the inner space of the channels in the membrane.
 
It is found that the negative surface charge at the interface between the channel wall and the electrolyte plays an essential role in ion transport. The physical process of the filtration process is not well understood. Further understanding is related to many applications, such as the assembly of these materials and the behavior of clay.
For current 2D nanomaterials affected by harsh conditions, boron nitride film may be an attractive and promising alternative.


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Tag: Boron Nitride