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- W2150873793 abstract "We report an investigation into a dynamic contrast phenomenon in water-oil emulsions imaged in the environmental scanning electron microscope. Secondary electron contrast between oil and water phases is shown to change with scan rate, even inverting in extreme cases. This effect is attributed to the fact that charge carriers in liquids have intermediate mobilities compared with those in metallic conductors and solid insulators. Thus, increasing the electron energy flux density (via slower scan rates) results in the temporary accumulation of excess charge, which in turn gives rise to increased secondary electron emission. Excess charge dissipates between frames, however, such that classical charging of the specimen is not observed. The oils used here have conductivities lower than that of water, making them more susceptible to the effect. However, the material within the primary electron interaction volume is a conductive medium. We demonstrate that charging effects are not seen in regions of the oil where the interaction volume is in contact with the more conductive continuous water phase. Secondary electron emission from these regions therefore approximates to the intrinsic yield." @default.
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- W2150873793 date "2006-12-06" @default.
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- W2150873793 title "Dynamic secondary electron contrast effects in liquid systems studied by environmental scanning electron microscopy" @default.
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- W2150873793 doi "https://doi.org/10.1002/sca.4950220604" @default.
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