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Experiment "Marseille3"
These experiments have been conducted during the open workshops of the What the Flok ? festival taking place in Marseille, from Septembre 29th to October 4th.
Crate Design #1
Design features
Clay sampling spot - Niolon, France.
- Substrate: topsoil gathered from La Friche's garden - two days before assembly - inoculated with 10 mL of clay gathered in Niolon (picture above) on the day of assembly.
- Volume: 80*30*2 cm3
- Container: crate, covered with a transparent garbage plastic bag.
- Proton Exchange Membrane: printer paper with low amount of ink.
- Surface: 80*30 cm2
- Water comes from La Friche's tap - maybe chlorinated.
- Anode: copper covered with carbon, extracted from a dead DELL PC battery found in the LFO storage space.
- Surface: 70*5 cm2
- Cathode: copper covered with less carbon, extracted from the same battery.
- Surface: 70*5 cm2
Performances
- Voltage: started at 30mV, went up avove 40, and dropped down to 0 in 2 hours.
- Current: started at 0.125 mA, and dropped down to 0 in 2 hours.
Max Power Measured: 3.75 microW
Crate Design #2
Design features
- Substrate: mud gathered from La Friche's garden on the day of assembly.
- Volume: 80*30*2 cm3
- Container: crate, covered with a transparent garbage plastic bag.
- Proton Exchange Membrane: three to four overlapping sheets of newspaper, covered in ink.
- Surface: 80*30 cm2
- Water: mainly rainwater from the mudsource, with some tap water (0.5L) to complement - maybe chlorinated.
- Anode: copper covered with carbon, extracted from a dead DELL PC battery found in the LFO storage space.
- Surface: 70*5 cm2
- Cathode: copper covered with less carbon, extracted from the same battery.
- Surface: 70*5 cm2
Performances
Performances on Day0:
- Voltage: around 5 mV.
- Current: around 0.1 mA.
Performances on Day1:
- Voltage: around 45 mV.
- Current: around 0.1 mA.
Performances on Day2:
- Voltage: around 130 mV peak.
- Current: around 0.5 mA peak.
- Strange measurement behavior:
- Voltage starts at 80 mV, and builds up to 130 mV in about 15 minutes.
- Current starts at 0.7mA and drops to 0.3mA in about 15 minutes too.
Performances on Day3:
- Voltage: around 250 mV, stable.
- Current: around 1.5 mA peak, decreasing slowly, stabilized around 0.60 mA.
Performances on Day4:
- Voltage: around 350mV, stable.
- Current: around 1 mA.
Peak Power Measured: 375 microW.
Max (stable) Power Measured: around 350 microW.
Pile Microbienne Marseillaise
Design features
Marine sediments sampling spot - Marseille, France
- Substrate: sea sediments gathered ten meters from the Catalan beach in Marseille on the day of assembly.
- Volume: 0.5L
- Container: 2L plastic bottle.
- Proton Exchange Membrane: a piece of cardboard.
- Surface: the bottle's section (diameter of 6-8 cm).
- Water: seewater.
- Anode: copper covered with carbon, extracted from a dead DELL PC battery found in the LFO storage space.
- Surface: 50*5 cm2
- Cathode: copper covered with less carbon, scrap from the supercapacitors experiment.
- Surface: 20*5 cm2
Performances
Performances on Day0:
- Voltage: about 13mV
- Current: about 0.1 mA
Performances on Day1:
- Voltage: about 110mV
- Current: starting at 7 mA ! And dropping slowly
Peak Power Measured: 770 microW
Observations
Even though the multimeter was connected the wrong way (+ on anode, - on cathode), we first had positive (and quite high) current and voltage value. Is this due to remanant charges from the PC battery ?