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--- michka:research:microbial_fuel_cells:bruxelles2 [2014-09-26 09:43] – created michka
+++ michka:research:microbial_fuel_cells:bruxelles2 [2014-09-26 10:01] – michka
@@ Line 3: / Line 3: @@
 ===Salt Bridges===
-I failed a three batches of salt bridges before managing to have one stable made.
+I failed a three batches of [[http://www.treehugger.com/slideshows/gadgets/make-microbial-fuel-cell/page/3/#slide-top|salt bridges]] before managing to have one stable made.
 ===The right protocol===
@@ Line 27: / Line 27: @@
 ===Mud, Tall===
+Design details:
+   * The mud sample was taken from the waterland at the bottom of Scheutbos Park in Sint-Jans-Molenbeek.
+   * Its approximate volume is 50 cl.
+   * On top is a highly concentrated Petri-dish-sized salt bridge.
+   * On top is filtered water.
+   * Electrodes are made of copper from dead batteries. They have an approximate surface area of 100cm2 each.
+   * Crocodile clips are clipped on the electrodes and brought out of the pot for measurement.
+Results:
+   * Tension is unsensitive to oxygen presence, and is in the 300mV range.
+   * Current is in the 1-2mA range.
+   * Power is therefore in the mW range.
 ===Mud, Small===
+Design details:
+   * The mud sample was taken from the waterland at the bottom of Scheutbos Park in Sint-Jans-Molenbeek.
+   * Its approximate volume is 3 cl.
+   * On top is a salt bridge the size of the jar.
+   * On top is filtered water.
+   * Electrodes are made of copper from dead batteries. They have an approximate surface area of 10-20cm2 each.
+   * Crocodile clips are clipped on the electrodes and brought out of the pot for measurement.
+Results:
+   * Tension is sensitive to oxygen presence, and is in the 100mV range when activated, 30 mV at rest.
+   * Current is sensitive to oxygen presence, and is very low - about 0.3 mV when activated, dropping to 0.1 mV at rest.
+   * Power is therefore in the microW range.
 ===Vegetable Waste & Compost Tea===
+Design details:
+   * The substrate is made of vegetable scraps (potatoes, carrotes, zucchinis) covered with compost tea (from FoAM's vermicompost production), and inoculated with a tea spoon of mud from Scheutbos Park.
+   * Its approximate volume is 7 cl.
+   * On top is a salt bridge the size of the jar (broken during the manipulations).
+   * On top is filtered water, which was quickly populated by compost tea from below the salt bridge.
+   * Electrodes are made of copper from dead batteries. They have an approximate surface area of 10-20cm2 each.
+   * Crocodile clips are clipped on the electrodes and brought out of the pot for measurement.
+Results:
+   * Tension is sensitive to oxygen presence, and is in the 200mV range when activated, 80 mV at rest.
+   * Current is sensitive to oxygen presence, and is very low - about 0.4 mV when activated, dropping to 0.1 mV at rest.
+   * Power is therefore in the microW range.