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CF surface and CF holder design. A–D: Scanning electron microscopic images of different CF, scale bars = 1 μm. A: Detail of the surface of a CF from Prof Jean-Yves LeGuennec, B: Same at higher magnification. Arrows show microstructures typical seen on these fibres. C: and D: non-sticky carbon fibres. E: Pulled and bent capillaries used to hold CF.
