Quantifoil Multi A (Multiple Shape) Holey Carbon Grids, Copper Mesh, Pk 100, Slide-A-Grid Box
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Quantifoil Multi A is a holey support film in which a pattern of various hole sizes, shapes and arrangements are repeated. In addition to circular holes, of three different diameters, there are also different hole spacings, including an oval hole which at high tilt angles would appear round (this would occur at ~ 70°).
The diameters of the circular holes are (about) 1, 1.4, and 2 µm, and the "bar widths" range from 0.5 to 4 µm. The oval holes in the foil have a dimension of 8x2 µm and 4 x 1 µm. By "bar width" we mean the distance covered, on carbon film, from the edge of one hole to the nearest neighbor hole. Take a closer look with better detail.
Carbon film (foil) thickness:
The carbon film thickness is closely controlled to be within the range of 10-12 nm. Across the film, there is virtually no thickness variation. Note that wherever there is the carbon film, there is the possibility for a thin (less than 20 nm) polymer layer, remaining from the production process. We always try to remove all of it, but sometimes, some thin amount does remain. However, the holes are guaranteed to be "clean", there is no polymer film layer covering any of the holes. So when you take data from a sample that is "over" a hole, you can be sure that there is nothing other than the sample in the path of the electron beam.