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(a) TEM image of SBA-15 before immersion for 60 days in SBF. The corresponding Fast Fourier Transform (FFT) is shown in the inset; (b) TEM image of an acicular particle formed after 60 days in SBF. EDS spectra performed on the particle and the amorphous matrix are shown as insets; (c) HRTEM detail of an acicular particle and its FFT. Adapted with permission from [45]. Copyright 2005 Elsevier (Amsterdam, The Netherlands).
