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HA synthesized under pH 9 conditions, without adding surfactants (P, P-C) and with the surfactant-assisted synthesis of non-ionic surfactant F127 (F127, F127-C) and zwitterionic surfactant CAPB (CAPB, CAPB-C) to form rod-shaped HA crystals. (a) Upper row: bright-field image; lower row: selective-area diffraction pattern indexed with HA lattice-reflective planes. (b) Upper row: high-magnification bright-field image; lower row: lattice image of the rod HA crystal.
