====Experiments "Nantes1"====

These experiments took place in the [[http://summerlabnantes.net/|Summerlab]] organised by [[http://www.pingbase.net|Ping]] at Nantes, from July 9th to July 11th, with [[http://lacaravane.noblogs.com|Chiara Bedin]], [[http://www.patasel.com|Etienne Maillard]], Nadège and [[http://www.mathgon.com|Matthieu Gonnet]].

===One Container Design===

{{ :michka:research:img_5901.jpg?300 |}}

   * Wiring as electrode.

==Results==

   * Peak voltage at 100mV, drops to 60, stable.
   * Voltage changes with oxygenation - + 10 mV.

===One Container in Crate Design===

   * Layed down the jar in a crate covered with a plastic bag and filled with water.
   * Five times bigger cathode, made of wiring, and then replaced by a flattened aluminium can.

==Why ?==

   * Augemented cathode surface area & reduced water layer width for oxygen access.

==Results==

   * No improved voltage with bigger wiring cathode.
   * Improved voltage (300 mV) with aluminium can cathode.
   * When putting directly the multimeter cathode in water, we obtain 600 mV.

==Conclusion==

   * The geometry of the multimeter cathode may be better for voltage than the one made of wiring or aluminium can. However, surface area is necessary to obtain current.

===Crate Paper Design===

{{ :michka:research:img_5905.jpg?300 |}}
{{ :michka:research:img_5906.jpg?300 |}}
{{ :michka:research:img_5946.jpg?300 |}}


   * Flattened aluminium can as electrode.
   * Thick paper sheet as PEM.

==Why?==

   * Reduced PEM width.
   * Augmented electrode (both) surface area.

==Results==

   * Negative voltage when putting a rock on cathode to maintain it in water.
   * No improved voltage by the new flat design.
   * Still no current measurable, probably very low.
   * The addition of coke drops (H+) at the cathode do not help current generation.

==Conclusion==

   * Is paper a good PEM ?

===Two Containers Design===

{{ :michka:research:img_5948.jpg?300 |}}

   * Two bottles
   * Saline bridge made of rope dipped in salt solution & wrapped in tape.
   * Hard-drive metal box as electrode material.

==Results==

   * The addition of coke drops (H+) at the cathode do not help current generation.

===Other results===

   * Two multimeter electrodes directly in water: about 30 mV.
   * One mutimeter electrode on aluminium can dipped in water, one directly in water: about 30 mV.
     * If water is not clean, voltage increases up to 100 mV.
   * Two multimeter electrodes in the mud: 10-80 mV depending on location.

===Overall Conclusion===

   * Maybe it needs a longer period to get started - eating up all the oxygen around the anode.
   * Maybe our PEMs are not good.