Naslov
Electrochemical impedance spectroscopy to understand interactions in phospholipid layers

Autori
Nelson, Andrew ; Frka, Sanja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
Zbornik radova = Proceedings / 3. hrvatski simpozij o elektrokemiji / Gojo, Miroslav - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2004, 135-139

Skup
3. hrvatski simpozij o elektrokemiji

Mjesto i datum
Dubrovnik, Hrvatska, 30.05.2004. - 03.06.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Impedance spectroscopy; sea-surface microlayer; phospholipids

Sažetak
A general mathematical model has been developed for the analysis of supported layers on conducting surfaces using electrochemi-cal impedance spectroscopy. The present paper describes the application of this model to two distinct systems: (i) Phospholipid monolayer of dioleoyl phosphatidylcholine (DOPC) on mercury which is undergoing a phase transition. It is shown that during the phase transition, the surface roughness increases, the zero frequency capacitance increases and the time constant of the extra capacitative element decreases. This is consistent with the co-existence of two phases on the electrode over a 0.02 V potential domain which is also commensurate with the layer on the electrode consisting of two components, phospholipid and water respectively. (ii)The second system is extracted ex situ sea surface microlayer material (ssm) deposited on mercury and also incorporated as a mixed monolayer with DOPC. The monolayers of hexane extracted ssm show less surface roughness than monolayers of dichloromethane extracted ssm. This is confirmed by BAM imaging of the layers at he air-water interface. Hexane extracted ssm shows less compatibility with DOPC than dichloromethane extracted ssm due to the formation of defects in mixed layers.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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