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Three-dimensional (3-d) chemical mapping using angle-scan tomography in a scanning transmission X-ray microscope is demonstrated. Apparatus, experimental procedures and data processing are presented and the 3-d spatial resolution is evaluated. The technique is illustrated using mapping of a low-density acrylate polyelectrolyte in and outside of polystyrene microspheres dispersed in water in a 4 µm-diameter microcapillary. The 3-d chemical visualization provides information about the microstructure that had not previously been observed.

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A three-dimensional rendering of the chemical map of polyacrylate against a two-dimensional slice of the polystyrene. The blue and green colors are two different thickness ranges of the acrylate signal.

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