Measure ionic resistance (aka SOP) ================================== .. include:: .. See https://docutils.sourceforge.io/docs/ref/rst/definitions.html .. note:: This standard operating procedure (SOP) also exists in `video form `_ Prepare the workstation ----------------------- .. warning:: When handling electrolyte always wear goggles and work in a well ventilated space. Checklist : Gloves, googles, ethanol, wipe, FIPT cell, brush, tweezer, cutting tool, pipette, pipette tips and your electrode. - Clean the workstation with ethanol. - Clean the pipette, the tweezer with dry wipe. - Set the pipette to 300ul and place the pipette tip. - Clean all parts of the FIPT cell with the brush to remove any contamination of past measurement . - Clean the cutting tool with the brush. Mind the blades! - Check age of electrolyte. - Check FIPT cell is complete: support, base, top and clamp. - Check screw clutch setting is 0.4Nm .. image:: images/sb/1.png :width: 45% Prepare separators ------------------- If you have no separator pieces left, cut them in the following way: - Cut the circular separator material (up to 3 at a time) with the triangle ruler and yellow cutting tool into **21mm wide** stripes. - Cut the stripes into smaller pieces (21mm |times| 35mm). - Throw out stripes with exessive wrinkling or contamination. .. image:: images/fipt_cut_separator.jpg :width: 45% Label FIPT cell --------------- - Clean the label on the cell wih ethanol. - Write the new label of the electrode and precise the side that you want to measure. .. image:: images/sb/2.png :width: 45% Cut the electrode ----------------- Checklist : Cutting tool, tweezer and your electrode labeled. - Place the electrode on the cutting tool. - Press the blades down to cut out the electrode strip. - Collect the electrode strip with the tweezer. - Check the edges of the strip are clean after cutting. The electrode strip should be **20mm wide**. - Repeat the cutting for two strips total. .. note:: Keep track of which side of the electrode you want to measure! .. image:: images/sb/3.png :width: 45% Assemble the FIPT cell ---------------------- Checklist : FIPT cell, tweezer, pipette, separator, electrolyte and 2 strips of electrode. .. warning:: All orientation markers of the FIPT cell should point to top-left. - Place the first strip orthogonal to the foam of the FIPT cell. Face up the side that you want to measure. - Place one separator on the middle of the electrode strip in the FIPT cell gap. - Check that separators sits stable in the center. .. image:: images/sb/4.png :width: 45% - Apply 300ul of electrolyte to the center of the separator. .. image:: images/sb/5.png :width: 45% - Place the second strip on the top of the separator, orthogonal to the first strip. Face down the side that you want to measure. .. image:: images/sb/6.png :width: 45% - Close the cell by adding the top. - Check that the orientation markers are aligned. .. image:: images/sb/7.png :width: 45% - Mount the top clamp. - Screw in the middle screw until the clutch of screw triggers (you will hear a click sound). .. image:: images/sb/9.png :width: 40% Run the measurement ------------------- - Attach 2 measurement wires to the strips of the electrode to connect the FIPT cell to an impedance analyzer. .. image:: images/sb/10.png :width: 40% - Set up the measurement. .. image:: images/sb/11.png :width: 40% - Carry out the FIPT measurement and determine the ionic resistance of your electrode. - Note that a good graph looks like a hockey stick. .. image:: images/sb/12.png :width: 40% .. note:: To achieve reliable data, do a total of 3 measurements per sample Analyze your data ----------------- A typical data set looks like this: .. image:: images/fipt_test_data_003.csv.fit.plot.png :width: 100% To see how to analyze your FIPT data using our `fipt-analysis `_ , watch our follow up `video on our website `_