Microelectrodes oxygen

Figure 6 Oxygen fluxes determined from benthic lander measurements (X) and calculated from microelectrode oxygen gradients measured in the top few centimeters of pore waters (O) as a function of latitude and depth on the northwest US continental margin. Error bars are the standard deviation of replicate measurements (after Archer and Devol, 1992).

Y. Gao, H. Kita, Y. Watanabe and K. Sima, An electrochemical Nation matrix oxygen sensor and the evaluation of oxygen permeation in coated films, J. Appl. Electrochem., 1993, 23, 1102-1106 S. Sotiropoulos and K. Wallgren, Solid-state microelectrode oxygen sensors, Anal. Chim. Acta, 1999, 388, 51. 

Polysiloxane based block copolymers have also been examined with respect to their transport properties, because these copolymers are of special interest as membranes in various biomedical applications 376). The combination of good mechanical, dielectric, permeation and film formation properties of siloxane-carbonate segmented copolymers have led to their use as blood oxygenation, dialysis and microelectrode membranes 392 394. ... 

PDMS-co-PS has been proposed to have the antithrombogenicity. PDMS-PEO-heparin has been synthesized to achieve better blood compatibility. Silicone-PC copolymers are always used as blood oxygenation, dialysis, and microelectrode membranes. 

Dickinson et al. also used microelectrodes to measure dissolved oxygen (DO), H2O2, and local within biofouling deposits on stainless steel surfaces exposed to river water to further resolve the interfacial chemistry that resulted in ennoblement. Data were then compared with those from similar measurements as close as possible to the environment of a non-fouled substratum. 

Parthasarathy A, Srinivasan S, Appleby AJ, et al. 1992a. Temperature dependence of the electrode kinetics of oxygen reduction at the platinum/Nafion interface—A microelectrode investigation. J Electrochem Soc 139 2530-2537. 

The experimental set-up for cellular oxygen measurements (p02) consists of following components p02 measuring micro chamber (volume 0.6 microliter), polarographic microelectrode, water-bath for constant temperature, chemical microsensor connected to a strip-chart recorder and gas calibration unit. 

L. Mao, J. Jin, L. Song, K. Yamamoto, and L. Jin, Electrochemical microsensor for in vivo measurements of oxygen based on Nafion and methylviologen modified carbon fiber microelectrode. Electroanalysis. 11, 499-504 (1999). 

Biichi, F. N., Wakizoe, M. and Srinivasan, S. 1996. Microelectrode investigation of oxygen permeation in perfluorinated proton exchange membranes with different equivalent weights. Journal of the Electrochemical Society 143 927-932. 

Diffusive boundary iayer at the sediment-water interface measured with oxygen microelectrodes in Danish coastai sediments in a totai water depth of 15m. Source-. After Gundersen, J. K., and B. B. Jorgensen (1990). Nature 345, 604-607. 

Armstrong W, Cousins D, Armstrong J, Turner DW, Beckett PM. 2000. Oxygen distribution in wetland plant roots and permeability barriers to gas-exchange with the rhizosphere a microelectrode and modelling study with Phragmites australis. Annals of Botany 86 687-703. 

Fig. 2.10 Amounts of 02 consumed as a result of photocatalytic reactions in ethanol-containing aqueous solution, with and without 0.1 M phenol present, under UV irradiation for 1 min. The amount of 02 consumed was estimated using a finite difference method from the oxygen concentration vs. time curves (light intensity, 2.5 mW/cm2 microelectrode potential, -1 V vs. SCE).

Hybride micro-FIA systems produced in silicon technology using oxygen microelectrodes and microcavities have been developed for measuring phosphate concentrations [96]. Multiple analyte biosensor arrays can also be realized using thin film and silicon technology. The so-called containment technology has been applied to immobilize enzymes in three dimensional cavities formed in silicon wafers to get fully process compatible biosensor devices [97] (Fig. 5). 

Investigation of the Oxygen Reduction Reaction on LaMn03 Microelectrodes... 

---