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===Dissolved oxygen (DO) probes=== '''Membrane electrode''' (a.k.a. strip an automotive O2 sensor for parts to make a membrane electrode) Pros * New sensors for out of date cars are available on eBay for $10 * Contain required platinum, anodes, and teflon membrane Cons * Sensors typically operate at ~300C Progress * Ordered 3 $6-$10 probes on ebay to futz with * Plan is to knock out the zirconium matrix and add a KCl electrolyte to see if we can get a reaction started at room temperature. '''Optode''' (a.k.a. build an intensity- or time-based optode from scratch) Recently, people have been using a [http://www.sigmaaldrich.com/catalog/ProductDetail.do?lang=en&N4=85793|FLUKA&N5=SEARCH_CONCAT_PNO|BRAND_KEY&F=SPEC ruthenium complex] as a visual (fluorescent) indicator of oxygen concentration. This complex is excited by a blue LED, then its transmission is measured by a filtered photoresistor (more details [http://www.env.gov.nl.ca/env/waterres/rti/rtwq/07_14.pdf here in pdf]) Pros * All solid state (super low maintenance) * No calibration needed Cons * Could be some serious tecnical hurdles to overcome on this one * Ru molecule is expensive (~$70/mg) Film Contruction Ideas * Disperse catalyst in PVC powder, bake in oven on top of PET film under compression. May hit a rheology problem with the PET film. Melting point of PET is close to that of PVC. * Film coat: PVC dissolves in 2-butanone, whereas PET will not. Make a thin liquid layer, then allow to evaporate. PVC morphology may not provide necessary mechanical stiffness after this process. '''Commercial resources''' * [http://www.sigmaaldrich.com/catalog/ProductDetail.do?lang=en&N4=85793|FLUKA&N5=SEARCH_CONCAT_PNO|BRAND_KEY&F=SPEC ruthenium complex] * [http://www.vernier.com/probes/do-bta.html DO-BTA Dissolved Oxygen Sensor] $209 * [http://www.google.com/products/catalog?q=dissolved+oxygen+sensor&hl=en&safe=off&cid=1714170039035567861&os=sellers# Yellow Springs Dissolved Oxygen Meters] $80-104
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