DocumentCode :
1218480
Title :
Open Tip Glass Microelectrodes: Conduction Through the Wall at the Tip
Author :
Gagne, Simon ; Plamondon, Rejean
Author_Institution :
Laboratoire de Vision et Systémes Numériques, Département de Génie Ã\x89lectrique, UniversitéLaval
Issue :
1
fYear :
1987
Firstpage :
56
Lastpage :
61
Abstract :
A theoretical and experimental study of the electrical resistance and the tip potential of open tip glass microelectrodes is presented. The main physico-chemica1l factors considered are the diffusion process of ions through the open tip, the ionic conduction in the bulk solutions, and the ionic conduction in the electrochemical double layers at the glass-electrolyte interface. In order to take into account possible conduction through the glass at the tip, a small part of the microtip is considered to be highly hydrated and its length is considered as an upper limit for the extent of hydration. Its longitudinal conduction is assumed to be much greater than in the remaining truncated cone. This lumped model, like a previous one which assumed a uniform distributed hydration, can be used to explain the electrical properties of open tip glass microelectrodes. It is concluded that end effects at the tip of a glass microelectrode are important and could explain in part their electrical properties.
Keywords :
Apertures; Conductivity; Dielectrics and electrical insulation; Diffusion processes; Electric resistance; Equivalent circuits; Glass; Machine vision; Microelectrodes; Predictive models; Electric Conductivity; Glass; Microelectrodes;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/TBME.1987.326015
Filename :
4122433
Link To Document :
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