Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session A07: Nanoflows: Complex Systems
8:00 AM–9:57 AM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B212
Chair: Dimitrois Papavassiliou, University of Oklahoma
Abstract ID: BAPS.2018.DFD.A07.2
Abstract: A07.00002 : Ion-Selective Transport and Osmotic Power Generation in Boron-Nitride Membranes with Non-overlapping Double Layers
8:13 AM–8:26 AM
Presenter:
Semih Cetindag
(Rutgers University)
Authors:
Semih Cetindag
(Rutgers University)
Aaditya Pendse
(University of Illinois at Chicago)
Doo Sung Hwang
(University of Illinois at Chicago)
Sanjay Behura
(University of Illinois at Chicago)
Vikas Berry
(University of Illinois at Chicago)
Sangil Kim
(University of Illinois at Chicago)
Jerry W Shan
(Rutgers University)
Hexagonal boron nitride (h-BN) membranes, which develop high surface charge in basic solutions, are of interest for various potential applications, including osmotic power generation, highly efficient filtering and separation processes. Here, we investigate ion transport and power generation in macroscopic h-BN nanopore membranes (BN-AAO) fabricated from anodized alumina (AAO) templates. Despite the relatively large pore diameter of 30 nm, the BN-AAO membranes show highly selective transport, with electrophoretic transport rates differing by a factor of ~74.5 between positively and negatively charged fluorescent ions (NDS(-2) vs Ru(bpy)(+2) ) at pH=10. The membranes also show high osmotic power densities in the range of 27-99 W/m2, based on the open pore area, for a KCl molarity difference across the membrane of CH/CL = 1000/1 mM at pH=11. The ion selectivity and osmotic power generation are correlated to each other, and both drop with decreasing surface-charge density at lower pH. However, conductance tests suggest that an improved theoretical model, considering the concentration-dependent surface charge, may be needed to correctly estimate the surface charge of h-BN nanochannels. We conclude by comparing the BN-AAO membranes with similar selective ion-transport systems.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.A07.2
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