Electrochemical and PM-IRRAS studies of the effect of the static electric field on the structure of the DMPC bilayer supported at a Au(111) electrode surface

被引:90
作者
Bin, XM [1 ]
Zawisza, I [1 ]
Goddard, JD [1 ]
Lipkowski, J [1 ]
机构
[1] Univ Guelph, Dept Chem, Guelph, ON N1G 2W1, Canada
关键词
D O I
10.1021/la048710w
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Differential capacity, charge density measurements, and polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) were employed to study the fusion of small unilamellar vesicles of 1,2-dimyristoyl-sn-glycero-3-phospliocholine (DMPC) on a Au(111) electrode surface. The differential capacity and charge density data showed that the vesicles fuse onto the gold surface at charge densities between -10 muC/cm(2) < sigma(M) < 10 muC/cm(2) to form a bilayer. When sigma(M) < -10 muC/cm(2), the film is detached from the surface but it remains in close proximity to the surface. PM-IRRAS experiments provided IR spectra for the bilayer in the adsorbed and the desorbed state. Ab initio normal coordinate calculations were performed to assist interpretation of the IR spectra. The IR bands were analyzed quantitatively, and this analysis provided information concerning the conformation and orientation of the acyl chains and the polar head region of the DMPC molecule. The orientation of the chains, hydration, and conformation of the headgroup of the DMPC molecule strongly depend on the electrode potential.
引用
收藏
页码:330 / 347
页数:18
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