Proton transport in mesoporous silica SBA-16 thin films with three-dimensional cubic structures.
Proton transport in mesoporous silica SBA-16 thin films with three-dimensional cubic structures.
复制标题
具有三维立方结构的介孔二氧化硅 SBA-16 薄膜中的质子传输。
作者：
Junho Hwang;H. Daiguji
采用蒸发诱导自组装方法，以F127三嵌段共聚物为结构导向剂，通过浸涂法制备了具有高度有序三维立方结构的介孔二氧化硅SBA-16薄膜，研究了介孔内水溶液的质子输运。利用直流电场下离子电流的电化学测量，阐明了SBA-16薄膜介孔中质子输运现象。在10(-7)~ 10(-5)M的低浓度范围内，KCl和HCl水溶液的I-V曲线呈非线性。在10（-4）和10(-3)M时，KCl水溶液的I-V曲线表现为非线性，而HCl水溶液的I-V曲线几乎为线性。这种线性行为可归因于介孔内表面硅烷醇基团质子化引起的表面电荷密度的降低，从而导致电位势垒的降低。在10(-2)~ 1 M的高浓度下，KCl和HCl水溶液的I-V曲线几乎是线性的，因为介孔表面电荷对离子传输的影响很小。
Mesoporous silica SBA-16 thin films with highly ordered 3D cubic structures were synthesized by an evaporation-induced self-assembly method, using an F127 triblock copolymer as the structure-directing agent via dip coating, to investigate the 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.
影响因子：
10.8
作者：
Vlassiouk, Ivan;Smirnov, Sergei;Siwy, Zuzanna
通讯作者：
Siwy, Zuzanna