PT  - JOURNAL ARTICLE
AU  - LICHT, STUART
AU  - CAMMARATA, VINCE
AU  - WRIGHTON, MARK S.
TI  - Time and Spatial Dependence of the Concentration of Less Than 10<sup>5</sup> Microelectrode-Generated Molecules
AID  - 10.1126/science.243.4895.1176
DP  - 1989 Mar 03
TA  - Science
PG  - 1176--1178
VI  - 243
IP  - 4895
4099  - http://science.sciencemag.org/content/243/4895/1176.short
4100  - http://science.sciencemag.org/content/243/4895/1176.full
SO  - Science1989 Mar 03; 243
AB  - The time and spatial dependence of the concentration of as few as 40,000 electrogenerated, redox-active molecules has been determined. The distance between generator and detector microelectrodes in an array used in the study could be varied from 0.8 to 28 micrometers. Measurements of a sufficiently small ensemble of molecules allowed the experimental results to be compared with a quantitative simulation of the random movement of each member of the ensemble. The transit time of an electrogenerated species from the generator to a collector microelectrode was measured as a function of viscosity, diffusivity, and distance.