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Measurement of the surfaces Through out the molding process it was imperative to see what surface modifications were being done to the Nafion membrane to refine the pressing process. Thanks to the Surface Metrology Laboratory at the Worcester Polytechnic Institute and Olympus, an Olympus LEXT3100 scanning laser confocal microscope was available to use to measure the surfaces of the Nafion and the aluminum molds. Measurement of the molds The confocal focal microscope was used to measure the different molds to see if they could be discriminated from one another. Also the measurements of the molds were used to compare how much the surface texture of the mold was successfully transferred to the Nafion through the pressing process. Measurements of the molds were taken using 20x, 50x, and 100x, and no use of zoom. Measurement of the Nafion membranes The confocal microscope was also used to measure the Nafion membranes. Since the Nafion membrane was a transparent material one had to be careful not to measure through the Nafion to the surface that was underneath. This was realized when using an index card as a surface to hold the Nafion during the initial measurements and seeing a measurement that looked similar to paper instead of a smooth surface of the Nafion. When measuring the Nafion under high objectives (20x-100x) the Nafion would heat due to the laser from the microscope. This would cause the Nafion to absorb water and to swell. This swelling of the Nafion caused it to move when being measured. These movements prevent the surface from being measured accurately. A restraint system for the Nafion during measurement was used. The restraint system consisted of an aluminum cylinder with to magnets inside the cylinder, which were mounted flush with the top surface of the cylinder. The Nafion 15PDF Image | surface roughness of the Nafion membrane in a PEM fuel cell
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