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Figure 4
C 1 s STXM study of polyurea capsules. The upper left shows an image at 285 eV of a microtomed section containing a nearly complete capsule embedded in epoxy. The lower left shows the C 1 s spectra of the epoxy, butylphenylurea (asymmetric model) and diphenylurea (symmetric model) on a mass absorption scale set by matching to the elemental response given by summing mass absorption coefficient spectra (Henke et al., 1993BB10). The spectra of small molecules with similar local structure have been used to model the latter two components. The center panel displays derived component maps and average line profiles of each component across the capsule wall in the indicated region. The right panel shows the corresponding signals for a different capsule wall: one prepared with a longer emulsification step, which leads to a thick outer skin of symmetric urea. Note that different distance scales are used for the two different capsule samples. (ALS BL 7.0 STXM instrument; Croll et al., 2000BB5.)

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