Phospholipid bilayers at the mercury (Hg)/water interface
Phospholipid bilayers at the mercury (Hg)/water interface
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汞 (Hg)/水界面处的磷脂双层
DOI：
10.1016/j.electacta.2018.05.141
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发表时间：
2018
影响因子：
6.6
通讯作者：
Rashid A
中科院分区：
文献类型：
--
作者：
Rashid A
本文报道了二油酰磷脂酰胆碱（DOPC）双层结构在负极性汞（Hg）电极上的电化学特性。在-1.0 V和-1.3 V的外加电压下，双层在汞表面是稳定的。实验方法是：-（i）快速循环伏安法（RCV）的“指纹”的双层，（ii）电位阶跃实验记录Zn 2+还原和，（iii）电化学阻抗。结果表明：双层的比电容（5 μ F cm − 2）和比电阻分别高于和低于无缺陷的自支撑DOPC双层。这表明在所施加的负电场内双层中存在水和离子。双层对电解质运动的阻力随着负电位的增加而降低，在-1.3 V时达到最小值。与DOPC单层涂覆的电极相比，在施加的负电位下，DOPC双层对Zn2+离子的渗透性较低，并且其对Zn2+的渗透性随着负施加电位的增加而增加。双层的比电容随着施加的负电位的增加而增加到约7.5 μ F cm − 2，这表明双层中水的重要性随着其对离子的渗透性的增加而增加。SiO2纳米粒子在双层膜表面的吸附导致了阳极电容电流双层重组峰的阶跃负电位移动，表明双层重组过程加速。
This study reports on the electrochemical characterisation of dioleoyl phospatidylcholine (DOPC) bilayer structures on a negatively polarised mercury (Hg) electrode. The bilayers are stable on the Hg surface between −1.0 and −1.3 V applied potential. The experimental approaches were:- (i) rapid cyclic voltammetry (RCV) to “fingerprint” the bilayers, (ii) potential step experiments to record Zn2+reduction and, (iii) electrochemical impedance. The results show the following. Both the specific capacitance (5 μF cm−2) and the specific resistance of the bilayer are higher and lower respectively than that of a defect-free free standing DOPC bilayer. This indicates the presence of water and ions in the bilayer within an applied negative field. The bilayer's resistance to electrolyte movement decreases with increase in negative potential to a minimum at −1.3 V. The DOPC bilayer is less permeable to Zn2+ions compared to the DOPC monolayer coated electrode at applied negative potentials and its permeability to Zn2+increases with an increase in negative applied potential. The specific capacitance of the bilayer increases to about 7.5 μF cm−2with increase in applied negative potential showing the increasing significance of water in the bilayer commensurate with its increased permeability to ions. Adsorption of SiO2nanoparticles on the bilayer surface causes a step negative potential shift in the anodic capacitance current bilayer reformation peak indicating an acceleration of the bilayer reformation process.
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影响因子：
2.6
作者：
Naumowicz, Monika;Figaszewski, Zbigniew Artur
通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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