Mesoporous silica SBA-16 thin films with highly ordered 3D cubic structures were synthesized by evaporation-induced self-assembly method, using an F127 triblock copolymer as the structure-directing agent via dip coating, to investigate proton transport of aqueous solutions confined in mesopores. Using electrochemical measurements of ionic current under DC electric fields, we elucidated proton transport phenomena through mesopores of SBA-16 thin films. At low concentrations, ranging from 10−7 to 10−5 M, the I–V curves of KCl and HCl aqueous solutions were nonlinear. However, at 10−4 and 10−3 M, while I–V curves of KCl aqueous solutions displayed nonlinear behavior, those of HCl aqueous solutions were almost linear. The linear behavior can be attributed to a decrease in the electric potential barrier owing to a reduction in the surface charge density, which is caused by the protonation of silanol groups on the inner surface of mesopores. At high concentrations, ranging from 10−2 to 1 M, the I–V curves of KCl and HCl aqueous solutions were almost linear because the effect of surface charge of mesopores on ion transport was marginal.
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ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels
June 16–19, 2013
Sapporo, Japan
Conference Sponsors:
- Fluids Engineering Division
- Heat Transfer Division
ISBN:
978-0-7918-5559-1
PROCEEDINGS PAPER
Proton Transport in Mesoporous Silica SBA-16 Thin Films With Three-Dimensional Cubic Structures
Junho Hwang,
Junho Hwang
The University of Tokyo, Kashiwa, Chiba, Japan
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Hirofumi Daiguji
Hirofumi Daiguji
The University of Tokyo, Kashiwa, Chiba, Japan
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Junho Hwang
The University of Tokyo, Kashiwa, Chiba, Japan
Hirofumi Daiguji
The University of Tokyo, Kashiwa, Chiba, Japan
Paper No:
ICNMM2013-73112, V001T06A002; 7 pages
Published Online:
December 4, 2013
Citation
Hwang, J, & Daiguji, H. "Proton Transport in Mesoporous Silica SBA-16 Thin Films With Three-Dimensional Cubic Structures." Proceedings of the ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. Sapporo, Japan. June 16–19, 2013. V001T06A002. ASME. https://doi.org/10.1115/ICNMM2013-73112
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