Role of electrolyte in the occurrence of the voltage induced phase transitions in a dioleoyl phosphatidylcholine monolayer on Hg

Role of electrolyte in the occurrence of the voltage induced phase transitions in a dioleoyl phosphatidylcholine monolayer on Hg
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电解质在汞上二油酰磷脂酰胆碱单层电压诱导相变发生中的作用

DOI:
10.1016/j.electacta.2014.12.077
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发表时间:
2015
影响因子:
6.6
通讯作者:
Rashid A
Rashid A
中科院分区:
材料科学2区
文献类型:
--
作者:
Rashid A

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本研究研究了电解质离子对大约电势诱导相变发生的影响。汞 (Hg) 表面上的二油酰磷脂酰胆碱 (DOPC) 单层相对于 Ag/AgCl 分别为 -0.93 V 和 -0.99 V。研究了无机和有机电解质与 DOPC 的相互作用,结果表明,代表连续相变的电容峰性质的变化取决于电解质离子的离子强度和界面性质。较高的离子强度和与 DOPC 具有较强结合亲和力的阳离子会在整个磷脂层上产生更陡的电场,从而将表征电容 Peak-1 的表观电势转变为更正的值。相反,与 DOPC 结合的阴离子 I− 会减小脂质上的场梯度,并将表征电容 Peak-1 的电势特征转移到更负的电势。在比表征电容峰值 1 的电位更负的情况下,电解质会渗透 DOPC。因此,更高的离子强度和更小的水合阳离子以及更高的电荷密度增强了汞的屏蔽,从而导致汞表面产生更强的电场。这种效应缩短了起始时间,并增加了通过成核和生长 (N & G) 过程双层贴片对 Hg 的吸附潜力的速率依赖性。
The present study investigates the effect of electrolyte ions on the occurrence of potential induced phase transitions at ca. -0.93 V and -0.99 V vs Ag/AgCl respectively of dioleoyl phosphatidylcholine (DOPC) monolayers on the mercury (Hg) surface. The interaction of both inorganic and organic electrolytes with DOPC was studied and it was shown that the alterations in the nature of the capacitance peaks representing the successive phase transitions depend on the ionic strength and the interfacial properties of the electrolyte ions. Higher ionic strength and cations with stronger binding affinity to DOPC give rise to steeper electric fields across the phospholipid layer shifting the apparent potential characterising capacitance peak-1 to more positive values. Conversely the anion, I−, which binds to DOPC, lessens the field gradient across the lipid and shifts the potential characterising capacitance peak-1 to more negative potentials. At more negative potentials to those characterising capacitance peak-1, electrolyte penetrates the DOPC. As a consequence a higher ionic strength and smaller hydrated cations with higher charge density enhance the screening of Hg, leading to stronger electric fields at the Hg surface. This effect shortens the onset and increases the rate dependence on the potential of the adsorption of bilayer patches to Hg by a nucleation and growth (N & G) process.
二价阳离子对磷脂酰胆碱双层膜的吸附。
DOI: --
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